boosted

Currently working a blob with 320 ish bhp. Will be looking for more power next year, the addition of 7cm 20g turbo and some bigger injectors should see upwards of 360bhp and the illusive 12.xx second pass I'm after.
Question is do I need to go down te forged route? Ie forged Rods and pistons? I have a spare engine that's currently half built and was wondering if forged rods are an advantage (over wrx ones) at this power level? They are lighter and so help the engine rev higher right?
Or do I not need to worry and just bash on with a good, freshly built std WRX engine? Are they bad for throwing rods?

SAM-UK300

iTrader: (8)

The GENERAL rule which I use very loosely is that WRX Engines & Gearboxes are on borrowed time after 350bhp...

brendy76

iTrader: (6)

Id rather have the stronger internals then maybe use a lightened flywheel, lighter wheels etc to offset the difference matey.

boosted

But forged rods are lighter than oem matey?

boosted

What sort of failures do you see? My plan is to put bigger turbo on the std engine and map it, then if it fails replace it with the engine I'm building just now.

fat-thomas

iTrader: (4)

you will kill it quite quickly

ditchmyster

iTrader: (7)

There are those that have run as much as 450bhp on stock WRX engines.

fat-thomas

iTrader: (4)

thats just foolish though, it wont last 5 mins at that power.

the shreksta

iTrader: (20)

I don't see the point in rebuilding it to standard spec given what the car is used for, why not put uprated internals in whilst it's apart or buy an sti8 engine that will take 450bhp in standard form.................

boosted

I'm not taking it appart? I have two spare engines, building an engine out of the car so when the engine does go I can just swap it out.
No way would I buy a second hand sti engine, I would rather build my own engine knowing exactly what condition it's in.

boosted

What bit(s) fail?
I will be mapping the engine that is in the car first with bigger turbo, injectors etc. Then putting the good spare in once it's mapped.

boosted

What will die?

boosted

As I've said I will be bolting big turbo in and mapping the stock engine first, be interesting to see how it gets on.
No point putting my "good" engine in until I get a problem, right?

XDevil666

Another boosted thread with him having a spare engine!

Dam I'm excited to see how far this goes

Please please please do whatever your going to do on that standard engine boosted, I'm defo interested in how this will turn out

After your 6 speed conversion I'm interested in what you will do

boosted

Only slightly concern with the engine I'm running (and have been since I built it 6000 miles ago) is that it's a bitsa.
Was a £60 na engine I got off a farm, covered in mud beside a landrover, swapped my WRX pistons into it after honing the bores (never split the casings)
Then re used the MLS steel head gaskets as they looked fresh enough. Wee wipe of hylomar on them. Re used head bolts and put it all back together. Re used oil pump, Clean and new oil and filter obviously. Other than a bit of piston slap when it's cold it performs well at 1.5 bar on the 16g. Taking the pi55 trying to put 360hp through it maybe.
Hence the spare engine or two...
Cheapest (successful) WRX rebuild after big end failure ever?

XDevil666

don't know how you do it man, very talented lol, well since you have a few engines you have 3 lives to see what you do can

Maybe even teach a lot of people some new things along the way! Hell that's what the famous Harvey did, and I have a feeling your one these guys who likes to see how things work including breaking them and how you can push that extra edge no one else dares to push

Interesting to see what you do next

brendy76

iTrader: (6)

Apologies I somehow read you were thinking of using heavier rods (don't ask)... ill blame it on my habbit of trying to do too many things at once.

the shreksta

iTrader: (20)

You would never buy a second hand sti engine but you will strap a high output turbo to an lesser engine and push it past its comfort zone.................

boosted

Yes, because I own it. Just because you pay £800 for a second hand sti engine doesn't mean it won't run the big ends...
Then the only useful bit is the £800 sti pistons...
What is the engines comfort zone?

boosted

According to Andy forrest's website you don't need to forge a WRX engine until 390bhp has been burst

the shreksta

iTrader: (20)

The avcs heads will still be useful

the shreksta

iTrader: (20)

In that case mate. ..............crack on

boosted

Is he wrong?

boosted

I quote;

Level 1 260-280 bhp

Full Decat or Sportscat exhaust from turbo back 2.5 or 3” bore
Ecutek Custom ECU recalibration (similar to PPP)
Twin boost set up for high/low power switchable in-car
Walbro 255 l/hr uprated fuel pump
K+N panel filter



Level 2 290-310 bhp

Full Decat or Sportscat exhaust from turbo back 2.5 or 3” bore.
Decat uppipe Pre turbo
Walbro 255 l/hr uprated fuel pump
K+N panel filter
Ecutek Custom ECU recalibration
Twin boost set up for high/low power switchable in-car
AFP 04-H custom ported hybrid turbo
High Flow multi spray fuel injectors 550cc (380cc as std)
Uprated turbo to intercooler 'Y' pipe
NGK PFR 7B uprated spark plugs



Level 2(a) 300-320 bhp

Substitute VF34/35 or TD05-16G turbo in place of AFP04H for additional 10-20bhp but with slightly later turbo spool up.


Level 3 360-390 bhp

Full Decat turbo back 3” bore exhaust system
Tubular exhaust headers and flow matched uppipe
Walbro 255 l/hr uprated fuel pump
K+N panel filter
EcuTek custom ECU calibration.
Twin boost set up for high/low power switchable in-car
550cc Multi Spray Injectors
Fuel Lab turbo specification fuel pressure regulator with fitting kit & gauge
STI TMIC from 01-06 STI including undertray
AFP 05-20G custom ported turbocharger modified to fit with TGV
NGK PFR 7B uprated spark plugs

Level 3 Power may shorten the life of the transmission system this will depend on use and driving style. The 01 onwards UK 5 speeds do currently seem to be coping well with this level of output although as mileage increases this may become more of an issue.


Level 4 390-410 bhp

Full Decat turbo back 3” bore exhaust system
Tubular exhaust headers and flow matched uppipe
Walbro 255 l/hr uprated fuel pump
EcuTek custom ECU calibration.
Twin boost set up for high/low power switchable in-car
STI TMIC from 01-07 STI including undertray
AFP 321H custom turbocharger with fitting kit
Twin port 650cc Injectors
Custom cold air induction system



Level 5 420-450 bhp

Full Decat turbo back 3” bore exhaust system
Tubular exhaust headers and flow matched uppipe
Walbro 255 l/hr uprated fuel pump
Twin port 650cc Injectors
EcuTek custom ECU calibration.
Twin boost set up for high/low power switchable in-car
Fuel Lab turbo specification fuel pressure regulator with fitting kit & gauge
STI TMIC from 01-07 STI including undertray or optional FMIC
AFP 321T custom turbocharger with fitting kit
Custom cold air induction system
AVCR boost controller
NGK racing 8 spark plugs


Note We do not recommended level 4-5 on standard internals, clutch or gearbox. As a mimium we recommend forged pistons
and steel rods, steel head gaskets, uprated clutch. We also recommend either a PPG gear kit or 6 speed gearbox conversion ( from later STI)


PLEASE NOTE

We have included the tuning section us a guide to what we consider to be the most cost effective steps during tuning. This has been compiled with the benefit of experiencing hundreds of upgrades. There are other parts/turbos that can be substituted but the listed parts we have found to give the most consistant results over many installations.

JGlanzaV

iTrader: (3)

Go for it, most people just requote what they read on here and have never tried it them selves.



Looking forward to seeing this! My engine is one of these types that shouldn't do what it does and proves the nay sayers wrong all the time

wms-racing

You wouldn't build a nice house without good foundations would you? All my sensible customers build a nice spec engine first, then you can mod away as you want, and you won't be doing everything twice or more when you get problems.
At the end of the day it's your choice but threads like this usualy mean 'please tell me it will be ok'
It may be, but the probability is it won't be.

Deej

iTrader: (3)

Agreed, just give it a go. My instinct is that it will blow up eventually, but that's based on zero personal experience. I imagine a lot of opinions on the matter are no better informed than mine.

You seem prepared to take the risk and have the resources to do something about it if it goes wrong.

boosted

House foundations? I liken that to a rusty floor, I stopped buying fords ages ago!
I'm more like clapped out boiler running flat out, with a spare boiler ready to instal when it does go pop. You need to work on your analogies lol!
Chances are I will put forged H beam rods and sti pistons in my spare engine as that's only going to cost £225 to me (I have the pistons and the rods are £225)
I just wanted to hear from anyone's personal engine failure experience.

wms-racing

The analogy is that the engine is the base to tune from, you can add to it once you have a stong platform. If you have the time and know how then pushing it to destuction is fine, alot of People just want a reliable/fast car without having to swap engines all the time.
The weakest thing in a wrx engine is the pistons and rods, they are both about the same in terms of failure level, i've built loads of 'budget' engines and run sti pistons with steel rods, they are happy to 400bhp all day long.
I had one Guy phone me a while back as he needed a decent engine building, He said He had just been putting secong hand engines in once they went bang, He had owned the car for 2 years and put 9 engines in it. I decided He wasn't going to have one of my engines, lol.

boosted

Thanks for the good info.
I have some V5 sti pistons lying about, but was unsure on the rod situation. Brand new H beam rods are only £225 which is unbelievably cheap.
So with that combination and a 20g you would say high 300's are reliably achievable?
Just out of intrest how many rods to piston failures did the guy have with his 9 engines?