Lagamorph

iTrader: (12)

Had a touch of work done late last year on a standard bug STI uk car.

Harvey 20g
Harvey ported headers and 'trick' uppipe
Silicone turbo inlet
Full decat H&S (only 2.5")
650cc Injectors
Standard air box with green panel filter
Prodrive 3 port boost solenoid

Mapped by Andrew Carr on ECUtek running 1.5 bar'ish'

Happy with the drive, very smooth delivery with the expected lag associated with the 20g but strong pull when on boost all the way to the limiter. I did feel though that it wasn't that much quicker than before so had it on the rollers at RCM.







Disappointed with the result and was expecting 350+ (due to the restriction of the exhaust) can anyone shed any light on this? Also the air temp sensor was kept out of the engine bay and left on the wall to keep a fair comparison between other cars running that day (shoot out)??, would this make much difference?

I want to improve on this but not sure what direction to take. I'm not sure if I want to go down the front mount route at the moment as i like the standard look. Ive been in a Type r running 450 and don't want that kind of power as it would be a bit manic as a daily drive but clear of 380ish as a guesstimate of how I want the car to feel would sound about right.

Thanks in advance,
Andy

PS. I don't want the ball ache of meth.

stevemoir

iTrader: (24)

What boost was it set to ?

My 03 STI engine standard internals is running 1.8 bar

Your ecu if standard can control upto 1.55

Your best to go with full 3 inch decat

Is it running a 3 port ? Can't you get Harvey's trick uppipe as well ?

Steve

stevemoir

iTrader: (24)

Could do with an aftermarket boost controller as the boost only seems to go upto 1.45 bar ?

Steve

Lagamorph

iTrader: (12)

updated to inc 3 port and special harvey uppipe. not sure on exact boost pressure but i believe it to be 1.5bar according to my data monitor.

P1Drifter

iTrader: (7)

wouldn't of thought your exhaust would be that restrictive personally, just as comparison my hs20g made 404bhp @ 1.5bar on vpower. Have you spoke to your mapper, see what he says ?

stevemoir

iTrader: (24)

Just out of curiosity are you sure it's not a 16g you've got ?

Steve

Lagamorph

iTrader: (12)

I was a bit cheesed off at the time and lost a little confidence in him tbh so decided to leave it till next year (ie now) to sort it out but wanted to know peoples thoughts before I went back to him, second opinion etc.. as he doesnt seem to use scoobynet so I dont really know that much about his reputation. We did about 4 runs on the day of the map which didnt seem alot to me?

are you running on a 3" system and what headers are you using? Ive put a deposit down on some scoobyclinic headers, will this help things or not?

Lagamorph

iTrader: (12)

its this one

https://www.scoobynet.com/subaru-par...hp-proved.html

Shaks-STI

iTrader: (7)

My car made 366.1 bhp @ 1.2 bar mapped by Duncan at RCM, but i have a full decat, K&N cone filter but only 440cc injectors with FPR on V-power and AF TD05 20G

P1Drifter

iTrader: (7)

if your not happy with him use one of the other mappers that advertise on here, but stick to the more well known ones if i were you

On that turbo i was running a 3" downpipe into a 2.5" system with gtspec II manifold. I doubt your exhaust manifold is holding you back that much either, a lot of people have good results with Harveys stuff.

jayallen

iTrader: (31)

Is that my old Turbo fella?

To the OP, my 20g made the same as P1 Drifters....404@1.5bar so considering your spec something is a miss....Get Duncan to map it

alcazar

iTrader: (2)

With the setup you have, I'm running 740cc injectors.

Do you have FMIC and induction sorted?

KAS35RSTI

iTrader: (73)

Have you looked for any leaks, split pipes, cracks in the inlet manifold etc?

Turbotits

iTrader: (2)

would have expected more. somethings amiss
as a comparision my bug with an 18g,650 injectors,silicone inlet,lateral headers, still on the top mount is pulling 370ish

Shaks-STI

iTrader: (7)

Yes Jay thats your old turbo, Duncan knew the turbo when i told him about it.

Holding back until i can get bigger injectors and sort some fueling issue then will have Duncan to work his magic again.

jazzyjembreaze

iTrader: (11)

This might sound silly but !!!!
Did you uprate your fuel pump ?
As its not stated on your mods list , fpr wouldn't go amiss running 1.5 or above either

Davros 1979

iTrader: (56)

650cc on a 20g will be fine without an FPR.

jazzyjembreaze

iTrader: (11)

Is that because you don't ?
I'm not saying it would be fine / can only spk of personal - & I have always regulated air, fuel, temp - with any turbocharged car with half decent or above mods / besides the question was hows ur fuel pump fella !!!

Turbotits

iTrader: (2)

I think its more the standard fpr on the new age cars is a good peice of kit so know real need to change it if the injectors are up to it and the fuel pressure doesnt need raising above standard.

But as you rightly said the fuel pump needs to be up to the job too

jazzyjembreaze

iTrader: (11)

Jst heard of a few people having issues with walbro's lately / might be worth a shout changing it out , if indeed that's what he has on car / or if it hasn't been updated at all -

Turbotits

iTrader: (2)

I agree after using two walbro's over the last couple of years and both have failed to keep pressure up the high end ive switched to a hrc pump

chet123

iTrader: (7)

Interesting post subscribed. One question.....what are the standard injector size on a sti newage 05. Ta

What are the recommended injector upgrades for increasing bhp to something over 310bhp

stonejedi

iTrader: (51)

550cc and they would be more then enough for 310bhp.

chet123

iTrader: (7)

cheers, but is it essential to upgrade or a "nice to have" - is this mod proven to improve performance

P1Drifter

iTrader: (7)

the 550's are fine up to around 400bhp on a newage. Injectors on there own don't improve performance

stonejedi

iTrader: (51)

it all depends on how much power your looking really,injectors are just one piece of the performance puzzle.decide how much power you want and is practicle for you and your bank account and take it from there.

chet123

iTrader: (7)

Understood but just like Lagamorph who started this thread, I have newage sti with

Welbro 255
Full Decat 2.5"
K&N panel filter
Remap

Dyno'd at 318. I'm sure you can get those figures keeping a cat in whereas I had mines removed. Just curious to know whether I wasnt getting the expected figures with these mods because of a possible leak, injectors not sufficient enough etc. Hence the question. Thought I'd be closer the 330 mark but could something be restricting it i.e. injectors, hoses, other than that the cars runs fantastically.

I know the internals and TMIC are fine on these cars upto 400

stonejedi

iTrader: (51)

if you have had your car mapped the mapper would be able to diagnose where he thinks your losing power from and what mods you should do next to get to your desired power total.

stonejedi

iTrader: (51)

just to add i still run the prodrive cat and my car is pushing over 430bhp with my select mods but i will be saying bye bye to the cat as i am in search of more power.

g7prs

iTrader: (5)

This may be a stupid question but is that flywheel figures or at the wheels ?