dazdavies

iTrader: (22)

I have just put together the above combination and am wondering what would be the sensible boost limits to run it at. Bearing it mind it has standard Rods and pistons for now. I was thinking 1.4 bar dropping to 1.2???

Running the follwoing spec
Standard STI V 5 heads and valves
Apexi Power FC (possibly still running maf or maf/sim conversion)
Boost Control by Apexi AVCR
740cc injectors
Walbro intank fuel pump
Scooby clinic Front Mount Intecooler
Reversed inlet
RCMS induction with karge K&N cone
UK six Speed
Tial 40mm External wategate
RCMS rotated up pipe
RCMS 3 inch rotated down pipe
Blitz Nur Spec R Exhaust
SX FPR
Parallel fuel Rails

SSCJAY

Hi Daz,

Your spec looks very similar to mine now!!

I'm sure 1.4 bar will make near the 400 mark which is borderline with the standard pistons.

Why not save the hassle and put some Wiseco's in it now?

dazdavies

iTrader: (22)

Simple reason, its down to cost at the moment.

There is method to my madness though. I'm going to run it like this to make sure everything is positioned correctly and working. I've reversed the inlet manifold so its best to make sure everything is working ok with a light tune.

Once I've established that everything works ok then I will rebuild using race bearings, pistons and rods, stick a twin plate on it and get a maf less ecu as I have no idea how the maf sensor is going to cope.

I might even get some liners for the 2.5 and then go for the 500bhp mark

Daz

Jolly Green Monster

iTrader: (4)

I would say the limit needs to be on boost at the high rpm having the AVC-R on there allows the boost to be profiled.. and also restrict the rpm due to the standard rods and pistons.. probably 1.4 tailing to 1.2 and rpm limit around 6500rpm would be fine.. although your intension is to rebuild fairly soon to allow a lot more it would be a shame to push it too far and need to replace the crank or the block or the heads etc etc.. keeping AFR on the safe side and not going mad on the timing should provide a slight safey margin too..

Simon

john banks

I ran a very similar spec indeed except for the reversed inlet and the branding of some of the parts.

It did 15000 miles on the last engine at 1.6 bar flat with Optimax and careful timing and then the headgaskets leaked (again). Pistons on this EJ257 were OK.

I did a ring land on one of the early EJ257 pistons (and headgaskets) running more boost on a 20G with methanol and lots of timing.

dazdavies

iTrader: (22)

Simon, You're going to be the one mapping it lol. Infact is it ok if i give you a call to discuss few things?


John,

I was hoping for your input as I spent most of yesterday reading one of your threads, 40 odd pages long. As mentioned I am planning to drop in pistons and rods at some point but would like to get the most out of it without risking breaking it for a couple of months or so. So your input is very much appreciated.

Jolly Green Monster

iTrader: (4)

of course it is okay.. ring away..

at the end of the day it's your car if you want to run more boost etc then we'll do it you know the score.

Interested to know what RPM limit you used to stick to John?

Simon

john banks

I used to change by 7000 RPM Simon, but the limiter was at 7500 RPM.

I really wanted to sort the headgasket problem so I could fit pistons, but never saw the point until I did. I loved the way the EJ257 drove with 20G and GT30R though! Each "experiment" took a year because that is how long the last engine lasted. I moved to Evo land because I wanted a fresher car, the M3 was a disappointment, so it was between an STI or an Evo tuned to 400 BHP - latter did it with an exhaust, fuel pump, remap, STI would also have needed injectors, turbo, pistons and even now I still have questions about the headgaskets as some suggest the problem hasn't gone away. I always wondered if it was the surface prep of my block/heads, or that they'd been fitted/refitted so many times.

Jolly Green Monster

iTrader: (4)

touches wood and steps over the head gasket subject

Agree the EJ257 drives very well.

Simon

SSCJAY

Yes am in the same boat as you,

Simon is mapping mine with a conservative tune at the end of next month, (Will be limited by how much the standard gearbox can take)
So will let you know how we get on.

PPG set is slowly being saved for.

dazdavies

iTrader: (22)

I've got a fresh uk 6 speed so that should be ok.

Here's a couple of pics of the 2.5 Built and virtually ready for dropping in.

Just need to get it all heat wrapped

SSCJAY

Lovely pics, as always

Will be many hours spent keeping that lot clean.

dynamix

iTrader: (3)

Interested to see the results

stevebt

iTrader: (8)

Hopefully after today i can tell you what power they make, as mine is in scoobyclinic being mapped as i type

dynamix

iTrader: (3)

superb - i bet you are excited