GRIFF007

Anybody comment on:

Above cars with 6 spd will withstand 400lb ft as an everyday drive for a reasonable mileage (say 50k mls +)

That is to say no internal mods - just, turbo, IC and ECU

Suggestions for lowest cost safe upgrade for 03 Blob STi for over 350lb ft - no additional lag

john banks

IMHO, the earlier STis with forged pistons are strong, but the pistons may pick up in the bores when hot at serious power and torque levels. The later STis with hypereutectic pistons are reasonably strong, but may be less likely to pick up. I reckon the 6 speed is good for 400 lbft but I've only done 1/4 of your 50k mileage so far at this level.

If you want no additional lag then you either keep the original turbo, or you upgrade to twin scroll, or increase the capacity. IC is quite good already, ECU remapped will support a lot of power and torque.

400 lbft will require a lot of boost on a 2.0, don't think anyone has done it at 350-400 lbft on standard internals for a long time.

I reckon your best chance for reliability is to run a 2.5 with something like a 20G and run it at 350 lbft IMHO, but it is all opinion as no one has done it for 50k mls+.

Other opinions will differ, but for torque at low boost the EJ257 is obviously king of the standard engines, but is not standard on models you are looking at (yet), may never be.

If you want to hold that torque to the top - ie make serious power, you'll need to upgrade the injectors probably.

You might be best starting with exhaust, fuel pump and remap and see how you feel about it then?

GRIFF007

What mods are u running to get 400? (thanks for detailed answer above by the way)

How far do u think we can go just with pump, exhaust and re-map with 30k + mls expectancy - TSL claim 333 - customers say cant feel difference between T333 and PPP - however cant help thinking a real 350 lb ft has to be felt?! - If practical on 2 litre why did Ian feel need to go to expense of 2.5?

john banks

2.5 - very little lag, less octane hungry.

The turbo will determine the top end power above all else.

333 is about as far as you can go, really depends on the rollers, some 333s show less than 300 on some rollers for example.

GRIFF007

a 333 with PPP power - brilliant!

The 2.5 makes sense right up to the point you find out you have to take your nice new engine out and throw it away and keep the heads if you are lucky!!!

Why on earth isnt IM / Prodrive ordering some US 2.5 spec engined Euro cars and doing a proper Prodrive upgrade - sure it could be done for under £30k - where it needs to be..

john banks

Because for 262 to 300 BHP the 2.0 is ideal for a factory car, it revs high, is reliable and matches the gearbox.

You'll need serious boost to get 400 lbft out of a 2.0, and I'm not sure the stock piston clearances are up to it. A 2.5 feels unstressed kicking out this torque. The best 2.0s rev a lot nicer though up top. There are so many potential candidates for strong motors, but they all share rather small bearings so high mileage and silly torque are unlikely to go together.

GRIFF007

so your 'recipe to fit the bill, Jim?'

john banks

For 350 lbft on a new age STi get a JDM twin scroll STI and modify it as per Bob Rawle's thread, IIRC:

Fuel pump
ECU remap
Exhaust
Intake
Actuator
3 port solenoid
A dash of NF octane booster as you might run on an STi import anyway - say 2ml/litre.

If you can't get a twin scroll car you could consider retrofitting the twin scroll stuff, or you could go the 2.5 route with a single scroll turbo:

EJ257 block, headgaskets
TD05-16G for 350 lbft or TD05-20G for 400 lbft
Fuel pump
ECU remap
Exhaust
Intake
3 port solenoid

GRIFF007

thanks for helpful reply - will try and findBobs thread - what is IIRC?

john banks

if I recall correctly

GRIFF007

ah so!