MY2015 WRX STI - Updates
#151
Scooby Regular
Thread Starter
Cheers Andy, if I go down the sleeve route I’ll most likely stick to 2.5 displacement as there’s no need to de-stroke to 2.2, that new sleeves will be much thicker than the original 2.5 liners and it would be good to keep the extra capacity for torque benefits. I am certainly leaning towards sleeving the block, I know there’s always the risk of a dropped sleeve, but a 2.35 isn’t totally risk free either, it can come with its own set of issues. I like the idea of being able to replace a sleeve should anything untoward happen.
#153
Scooby Regular
Thread Starter
Just a little update, the engine has been stripped by Enginetuner and the block and crank are all serviceable so will be re-used. I’ve decided to stick with a forged 2.5, rather than go down the liner or 2.35 route. I’d like to build another drag car at some point soon, so will leave the big power route until then and leave the 2015+ as a fast road car. No point trying to chase massive power in a car that has a weight deficit, and I don’t want to start pulling the interior out as it’ll spoil a nice car.
So, the spec lost will be as follows:
EJ25 with closed deck conversion
2618 pistons
Forged rods
ACL bearings
14mm head studs
Cosworth stopper gaskets
Dual AVCS heads
Supertech nitrided inlet valves
Supertech inconel exhaust valves
Supertech double valve springs
Supertech titanium retainers
Supertech valve seats
Supertech viton valve stem seals
Brian Crower Stage 2 cams
Killer B oil oickip
Killer B oil baffle plate
RCM timing belt kit
Emtron standalone ECU
Stage 3 clutch
1000cc injectors
With the above and the rest of the bits already installed (precision turbo, FMIC, parallel fuel system etc) I’m hoping it’ll crack 500 which should make it a nice powerful road car.
So, the spec lost will be as follows:
EJ25 with closed deck conversion
2618 pistons
Forged rods
ACL bearings
14mm head studs
Cosworth stopper gaskets
Dual AVCS heads
Supertech nitrided inlet valves
Supertech inconel exhaust valves
Supertech double valve springs
Supertech titanium retainers
Supertech valve seats
Supertech viton valve stem seals
Brian Crower Stage 2 cams
Killer B oil oickip
Killer B oil baffle plate
RCM timing belt kit
Emtron standalone ECU
Stage 3 clutch
1000cc injectors
With the above and the rest of the bits already installed (precision turbo, FMIC, parallel fuel system etc) I’m hoping it’ll crack 500 which should make it a nice powerful road car.
#154
Scooby Regular
Good lad
What forged pistons and rods are you going for. How much headroom will you have. Can see you upping the power again loooool.
What forged pistons and rods are you going for. How much headroom will you have. Can see you upping the power again loooool.
#155
Scooby Regular
Thread Starter
That’s the last piece of the puzzle, ET have created a build sheet which I should have just after the new year and I’m happy to leave it to them, but yes I do want some headroom as I’m sure I’ll want some more power eventually. I know I’m always going to be limited by the block, but having the headroom for an extra 100bhp would be useful, particularly as I would like to go rotated on this car at some point for a more efficient setup.
#156
Scooby Regular
Just a friendly suggestion mate, you'll want more than 100bhp of head room. Stock location turbos are getting better and better. Way back when you couldn't get 500bhp without going rotated, now you can. So if you want to go rotated then you're chasing a very high bhp number and I don't think 100bhp will cut it.
Might be worth shopping around for pistons and con rods because yes they will be more expensive the higher rated you go but its cheaper than having to open up the block again. Time is money so garages don't have the time searching the internet for hours on end to find the best possible price and thats totally understandable. Make sure you get the exact size you need lol before you buy.
Might be worth shopping around for pistons and con rods because yes they will be more expensive the higher rated you go but its cheaper than having to open up the block again. Time is money so garages don't have the time searching the internet for hours on end to find the best possible price and thats totally understandable. Make sure you get the exact size you need lol before you buy.
#157
Scooby Regular
Thread Starter
Just a friendly suggestion mate, you'll want more than 100bhp of head room. Stock location turbos are getting better and better. Way back when you couldn't get 500bhp without going rotated, now you can. So if you want to go rotated then you're chasing a very high bhp number and I don't think 100bhp will cut it.
Might be worth shopping around for pistons and con rods because yes they will be more expensive the higher rated you go but its cheaper than having to open up the block again. Time is money so garages don't have the time searching the internet for hours on end to find the best possible price and thats totally understandable. Make sure you get the exact size you need lol before you buy.
Might be worth shopping around for pistons and con rods because yes they will be more expensive the higher rated you go but its cheaper than having to open up the block again. Time is money so garages don't have the time searching the internet for hours on end to find the best possible price and thats totally understandable. Make sure you get the exact size you need lol before you buy.
With regards to the 100bhp ceiling, that’s not the ceiling for the rods and pistons, it’s for the block. Getting past 500bhp isn’t very easy on an internally gated turbo in stock location, so going past that point really needs a rotated setup. I wouldn’t want to go too far past 600 on an EJ25 block though, they tend to become a bit of a lottery past that point and I don’t want to be splitting liners. If I wanted 700bhp+ Then it will be sleeved block or 2.35, but I don’t want fo go that far with this car now.
#158
Scooby Regular
That explains it
Some times you just got to send it. Like the Russian from Rocky would say "If the block breaks, it breaks"
You have deffo done your homework though
Some times you just got to send it. Like the Russian from Rocky would say "If the block breaks, it breaks"
You have deffo done your homework though
#159
Scooby Regular
Thread Starter
Last edited by Danjo; 28 December 2021 at 11:26 AM.
#160
Scooby Regular
worth to read about supertech valves and double valve springs etc if You plan to rise revs and bhp on 2.5l
https://www.scoobynet.com/general-te...e-springs.html
https://www.scoobynet.com/general-te...e-springs.html
#161
Scooby Regular
Thread Starter
worth to read about supertech valves and double valve springs etc if You plan to rise revs and bhp on 2.5l
https://www.scoobynet.com/general-te...e-springs.html
https://www.scoobynet.com/general-te...e-springs.html
I have seen Supertech failures from incorrect installation, but I’ve used them in the past in race cars and know many people using them with great results. It’s like anything though, they are not bullet proof. I used to run a big power R32 GTR that was running Tomei cams that had a reputation for breaking, but this was almost always down to incorrect installation.
Enginetuner will be more than capable of ensuring all valve train and cams are correctly installed, lash adjust correctly and a proper cam break-in so I’m happy to have them do that work.
Last edited by Danjo; 28 December 2021 at 12:36 PM.
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#162
Scooby Regular
Thread Starter
One other small update I forgot to post was the new suspension that I fitted just before the car went off to Enginetuner. I had previously been running Tein Flex Z’s which were ok, but they struggled on really bumpy backroads. The shocks bodies are quite short on them so you either had to run them rock hard or you were constantly hitting the bump stops. I missed the feel of the stock suspension which Subaru really got right on these, with their only flaw being their low speed ride quality.
I decided to invest in some H&R Coilovers which use Bilstein shock bodies and H&R springs (with helper springs on the front). These are designed as a fast road setup, the shocks have much more travel so should keep the car more controlled on rough roads. I haven’t had the chance to try them out yet, but reviews on them are very good. I decide to buy new standard front and rear strut tops and conical washers, along with new rear bump stops. This should help keep NVH to a minimum.
I decided to invest in some H&R Coilovers which use Bilstein shock bodies and H&R springs (with helper springs on the front). These are designed as a fast road setup, the shocks have much more travel so should keep the car more controlled on rough roads. I haven’t had the chance to try them out yet, but reviews on them are very good. I decide to buy new standard front and rear strut tops and conical washers, along with new rear bump stops. This should help keep NVH to a minimum.
#163
Scooby Regular
Think i will go rotated on that stage
#164
Scooby Regular
Thread Starter
#165
Scooby Regular
Thread Starter
Only a very small update, but I picked up a Perrin strut brace for the car over the Xmas break. It should finish off the engine bay nicely, although admittedly I’m doing it more as an engine bay dress up exercise than anything else, I’m not convinced they do much on these. I’ll get it bolted on once the car is back from Enginetuner.
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#166
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iTrader: (20)
Only a very small update, but I picked up a Perrin strut brace for the car over the Xmas break. It should finish off the engine bay nicely, although admittedly I’m doing it more as an engine bay dress up exercise than anything else, I’m not convinced they do much on these. I’ll get it bolted on once the car is back from Enginetuner.
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#167
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#168
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Thread Starter
I haven’t update this thread for some time now as my car has been with Enginetuner through the winter months. They have been flat out busy and my car is normally garaged over winter, so I was in no rush to have it back.
After a number of conversations about the final spec, we had decided to upgrade from Manley H Beam rods to the Turbo Tuff rods as I like to drag race the car, along with Mahle Motorsport 2618 pistons. I have also purchased a set of Supertech Cam Followers to complete the heads. I also decided to go down the flex fuel route so that I can run a meth mix, with the Precision turbo that should see me in the region of around 550bhp with ID1050 injectors providing the fuel, all managed by the Emtron ECU.
That brings me to this point…
Enginetuner had assembled the short block and the heads were nearly ready to go. However, I decided to put a spanner in the world, big time!
having had various chats with owners who had suffered liner failures on the EJ25, I decided to ask ET to strip the short block down again and send it off to Alyn at AS Performance to have the block sleeved with HD Iron Ductile liners, while keeping the closed deck conversion. This is going to allow me to push the build north of 700bhp. The car will be run in for me on the existing turbo and fuelling so I can enjoy it for a while, before the final push later in the year which will consist of a rotated turbo and more capable fuelling. Full spec for this stage of the build is below:
-EJ257 block
-Closed deck conversion
-HD Ductile Iron sleeves
-Mahle mororsport 2618 pistons
-Manley turbo tuff conrods
-APR 2000 rod bolts
-EJ25 nitrided crank
-ACL bearings
-Balanced rotating assembly
-14mm RCM head stud conversion
-RCM stopper head gaskets
-RCM timing belt kit
-Uprated 11mm oil pump
-BC stage 2 camshafts
-Supertech cam followers
-Supertech double valve springs
-Supertech titanium retainers
-Supertech nitrided inlet valves
-Supertech inconel exhaust valves
-Supertech valve seats
-Supertech viton valve stem seals
-Supertech cam followers
-KillerB windage tray
-KillerB oil baffle plate
-KillerB oil pickup pipe
-Competition Clutch Stage 3 clutch
-New OEM flywheel
-Emtron standalone ECU
-Flex fuel sensor
-Genuine STI TGV deletes
-10mm Thermal inlet spacers
-Fuji parallel fuel rails
-Fuji parallel fuel lines
-Fuji adjustable FPR
-Injector Dynamics 1050 injectors
-RCM 340lph fuel pump
-Precision 5530 ball bearing turbo
-Precision turbo inlet
-RCM equal length headers (Wrapped)
-RCM up-pipe (ceramic coated)
-Invidia 3” decat downpipe
-Milltek 3” exhaust system
-Perrin AOS (vented to atmosphere)
-PCV deleted
-Process West front mount intercooler
-GFB response blow off valve
-Perrin intake
-3 port boost solenoid
-3 bar map sensor
-Secondary air pump deleted
-Evap system deleted and vented to atmosphere
-STI group n engine, pitch stop and gearbox mounts
After a number of conversations about the final spec, we had decided to upgrade from Manley H Beam rods to the Turbo Tuff rods as I like to drag race the car, along with Mahle Motorsport 2618 pistons. I have also purchased a set of Supertech Cam Followers to complete the heads. I also decided to go down the flex fuel route so that I can run a meth mix, with the Precision turbo that should see me in the region of around 550bhp with ID1050 injectors providing the fuel, all managed by the Emtron ECU.
That brings me to this point…
Enginetuner had assembled the short block and the heads were nearly ready to go. However, I decided to put a spanner in the world, big time!
having had various chats with owners who had suffered liner failures on the EJ25, I decided to ask ET to strip the short block down again and send it off to Alyn at AS Performance to have the block sleeved with HD Iron Ductile liners, while keeping the closed deck conversion. This is going to allow me to push the build north of 700bhp. The car will be run in for me on the existing turbo and fuelling so I can enjoy it for a while, before the final push later in the year which will consist of a rotated turbo and more capable fuelling. Full spec for this stage of the build is below:
-EJ257 block
-Closed deck conversion
-HD Ductile Iron sleeves
-Mahle mororsport 2618 pistons
-Manley turbo tuff conrods
-APR 2000 rod bolts
-EJ25 nitrided crank
-ACL bearings
-Balanced rotating assembly
-14mm RCM head stud conversion
-RCM stopper head gaskets
-RCM timing belt kit
-Uprated 11mm oil pump
-BC stage 2 camshafts
-Supertech cam followers
-Supertech double valve springs
-Supertech titanium retainers
-Supertech nitrided inlet valves
-Supertech inconel exhaust valves
-Supertech valve seats
-Supertech viton valve stem seals
-Supertech cam followers
-KillerB windage tray
-KillerB oil baffle plate
-KillerB oil pickup pipe
-Competition Clutch Stage 3 clutch
-New OEM flywheel
-Emtron standalone ECU
-Flex fuel sensor
-Genuine STI TGV deletes
-10mm Thermal inlet spacers
-Fuji parallel fuel rails
-Fuji parallel fuel lines
-Fuji adjustable FPR
-Injector Dynamics 1050 injectors
-RCM 340lph fuel pump
-Precision 5530 ball bearing turbo
-Precision turbo inlet
-RCM equal length headers (Wrapped)
-RCM up-pipe (ceramic coated)
-Invidia 3” decat downpipe
-Milltek 3” exhaust system
-Perrin AOS (vented to atmosphere)
-PCV deleted
-Process West front mount intercooler
-GFB response blow off valve
-Perrin intake
-3 port boost solenoid
-3 bar map sensor
-Secondary air pump deleted
-Evap system deleted and vented to atmosphere
-STI group n engine, pitch stop and gearbox mounts
#169
Scooby Regular
I haven’t update this thread for some time now as my car has been with Enginetuner through the winter months. They have been flat out busy and my car is normally garaged over winter, so I was in no rush to have it back.
After a number of conversations about the final spec, we had decided to upgrade from Manley H Beam rods to the Turbo Tuff rods as I like to drag race the car, along with Mahle Motorsport 2618 pistons. I have also purchased a set of Supertech Cam Followers to complete the heads. I also decided to go down the flex fuel route so that I can run a meth mix, with the Precision turbo that should see me in the region of around 550bhp with ID1050 injectors providing the fuel, all managed by the Emtron ECU.
That brings me to this point…
Enginetuner had assembled the short block and the heads were nearly ready to go. However, I decided to put a spanner in the world, big time!
having had various chats with owners who had suffered liner failures on the EJ25, I decided to ask ET to strip the short block down again and send it off to Alyn at AS Performance to have the block sleeved with HD Iron Ductile liners, while keeping the closed deck conversion. This is going to allow me to push the build north of 700bhp. The car will be run in for me on the existing turbo and fuelling so I can enjoy it for a while, before the final push later in the year which will consist of a rotated turbo and more capable fuelling. Full spec for this stage of the build is below:
-EJ257 block
-Closed deck conversion
-HD Ductile Iron sleeves
-Mahle mororsport 2618 pistons
-Manley turbo tuff conrods
-APR 2000 rod bolts
-EJ25 nitrided crank
-ACL bearings
-Balanced rotating assembly
-14mm RCM head stud conversion
-RCM stopper head gaskets
-RCM timing belt kit
-Uprated 11mm oil pump
-BC stage 2 camshafts
-Supertech cam followers
-Supertech double valve springs
-Supertech titanium retainers
-Supertech nitrided inlet valves
-Supertech inconel exhaust valves
-Supertech valve seats
-Supertech viton valve stem seals
-Supertech cam followers
-KillerB windage tray
-KillerB oil baffle plate
-KillerB oil pickup pipe
-Competition Clutch Stage 3 clutch
-New OEM flywheel
-Emtron standalone ECU
-Flex fuel sensor
-Genuine STI TGV deletes
-10mm Thermal inlet spacers
-Fuji parallel fuel rails
-Fuji parallel fuel lines
-Fuji adjustable FPR
-Injector Dynamics 1050 injectors
-RCM 340lph fuel pump
-Precision 5530 ball bearing turbo
-Precision turbo inlet
-RCM equal length headers (Wrapped)
-RCM up-pipe (ceramic coated)
-Invidia 3” decat downpipe
-Milltek 3” exhaust system
-Perrin AOS (vented to atmosphere)
-PCV deleted
-Process West front mount intercooler
-GFB response blow off valve
-Perrin intake
-3 port boost solenoid
-3 bar map sensor
-Secondary air pump deleted
-Evap system deleted and vented to atmosphere
-STI group n engine, pitch stop and gearbox mounts
After a number of conversations about the final spec, we had decided to upgrade from Manley H Beam rods to the Turbo Tuff rods as I like to drag race the car, along with Mahle Motorsport 2618 pistons. I have also purchased a set of Supertech Cam Followers to complete the heads. I also decided to go down the flex fuel route so that I can run a meth mix, with the Precision turbo that should see me in the region of around 550bhp with ID1050 injectors providing the fuel, all managed by the Emtron ECU.
That brings me to this point…
Enginetuner had assembled the short block and the heads were nearly ready to go. However, I decided to put a spanner in the world, big time!
having had various chats with owners who had suffered liner failures on the EJ25, I decided to ask ET to strip the short block down again and send it off to Alyn at AS Performance to have the block sleeved with HD Iron Ductile liners, while keeping the closed deck conversion. This is going to allow me to push the build north of 700bhp. The car will be run in for me on the existing turbo and fuelling so I can enjoy it for a while, before the final push later in the year which will consist of a rotated turbo and more capable fuelling. Full spec for this stage of the build is below:
-EJ257 block
-Closed deck conversion
-HD Ductile Iron sleeves
-Mahle mororsport 2618 pistons
-Manley turbo tuff conrods
-APR 2000 rod bolts
-EJ25 nitrided crank
-ACL bearings
-Balanced rotating assembly
-14mm RCM head stud conversion
-RCM stopper head gaskets
-RCM timing belt kit
-Uprated 11mm oil pump
-BC stage 2 camshafts
-Supertech cam followers
-Supertech double valve springs
-Supertech titanium retainers
-Supertech nitrided inlet valves
-Supertech inconel exhaust valves
-Supertech valve seats
-Supertech viton valve stem seals
-Supertech cam followers
-KillerB windage tray
-KillerB oil baffle plate
-KillerB oil pickup pipe
-Competition Clutch Stage 3 clutch
-New OEM flywheel
-Emtron standalone ECU
-Flex fuel sensor
-Genuine STI TGV deletes
-10mm Thermal inlet spacers
-Fuji parallel fuel rails
-Fuji parallel fuel lines
-Fuji adjustable FPR
-Injector Dynamics 1050 injectors
-RCM 340lph fuel pump
-Precision 5530 ball bearing turbo
-Precision turbo inlet
-RCM equal length headers (Wrapped)
-RCM up-pipe (ceramic coated)
-Invidia 3” decat downpipe
-Milltek 3” exhaust system
-Perrin AOS (vented to atmosphere)
-PCV deleted
-Process West front mount intercooler
-GFB response blow off valve
-Perrin intake
-3 port boost solenoid
-3 bar map sensor
-Secondary air pump deleted
-Evap system deleted and vented to atmosphere
-STI group n engine, pitch stop and gearbox mounts
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#171
Scooby Regular
Somewhere, earlier I vaguely remember saying 1000bhp build and you were like no just more power. Something, something I told you so
#172
Scooby Regular
Thread Starter
Yeah I vaguely remember something about me trying to be keep it sensible, 500bhp will be enough, don’t want to go silly blah blah haha!! I clearly have issues! Ah well, you only live once hey! Prices on these cars are getting silly so I’m going to keep this forever, might as well make it something I’m not going to get bored with!
#173
Scooby Regular
Thread Starter
So the car is due back to me in a few weeks. The combination of a Covid epidemic and Ukrainian War has meant that things have been a lot harder to source than usual, so this build has taken longer than originally planned.
I have invested in a rotated setup for the car which I will be fitting over the winter months. It’s an RCM inconel rotated kit with a Precision 6262 Gen 2 bb turbo (rated for 700bhp) and Tial 45mm wastegate that vents back in to the exhaust to keep things a little more civilised.
Ive also invested in a new exhaust. The Milltek has a number of slip joints that I can see blowing apart as soon as the anti lag is used, so I’ve gone for an Invidia R400 that bolts together at every joint but should still flow well on this setup.
I have invested in a rotated setup for the car which I will be fitting over the winter months. It’s an RCM inconel rotated kit with a Precision 6262 Gen 2 bb turbo (rated for 700bhp) and Tial 45mm wastegate that vents back in to the exhaust to keep things a little more civilised.
Ive also invested in a new exhaust. The Milltek has a number of slip joints that I can see blowing apart as soon as the anti lag is used, so I’ve gone for an Invidia R400 that bolts together at every joint but should still flow well on this setup.
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#175
Scooby Regular
Thread Starter
#176
Scooby Regular
Thread Starter
The block is now back at Enginetuner and going through the final build phase. Massive thanks to Alyn at AS Performance for sorting out the HD Ductile Iron sleeves, the block looks like a work of art now. The rotating assembly has been balanced and fitted and the lash is being set on the heads, then it’s all together and back in the engine bay for base map and then running in.
I have also decided to have an engine bay mounted fuel surge tank with twin fuel pumps fitted in place of the battery, with the battery being relocated to the boot.
I have also decided to have an engine bay mounted fuel surge tank with twin fuel pumps fitted in place of the battery, with the battery being relocated to the boot.
#177
Scooby Regular
👍👍👍
How much longer before it’s back with you for the running in miles?
How much longer before it’s back with you for the running in miles?
#178
Scooby Regular
iTrader: (6)
The block is now back at Enginetuner and going through the final build phase. Massive thanks to Alyn at AS Performance for sorting out the HD Ductile Iron sleeves, the block looks like a work of art now. The rotating assembly has been balanced and fitted and the lash is being set on the heads, then it’s all together and back in the engine bay for base map and then running in.
I have also decided to have an engine bay mounted fuel surge tank with twin fuel pumps fitted in place of the battery, with the battery being relocated to the boot.
I have also decided to have an engine bay mounted fuel surge tank with twin fuel pumps fitted in place of the battery, with the battery being relocated to the boot.
#179
Scooby Regular
Thread Starter
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#180
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Thread Starter
Yep that’s a very fair comment and something f that did cross my mind, however after a chat today we have decided to go down the route of a radium dual pump hanger. I’m not going to be tracking this car really, so it’s a little overkill to have a surge tank.