I have a 2002 sti with the following mods:

Turbo back decat H & S exhaust, green panel filter, walbro pump, TD05 20g turbo, Harvey up pipe and ported headers, 3 port boost solenoid. Opinions on what these mods should produce range from 350 to a 400bhp.
Prior to the 3 port being fitted JGM mapped the car to 338bhp, saying the engine was refusing to accept the timing that would push the power levels up to where they ought to be. With the 3 port fitted a further remap made a miserable 318bhp and had everyone scratching their heads.
I can't be the only one (I hope!) who has had similar outcomes - any ideas? I want to sort it out but would like to start at the less expensive end of the investigation first. All help gratefully received!

 

Hi - guess we met on Friday...shared your disappointment at the time and it was very odd

It was holding boost OK, so unlikely to be an inlet side air leak or anything, but the fact that the results got worse between the two dyno sessions does suggest something is failing.

Having heard the engine on the dyno, my first port of call would be to check the exhaust system for leaks as it didn't sound quite right to me. When my engine was putting out 460bhp, I went on a rolling road day and found power was struggling to hit 400bhp - turned out I had blowing manifold-to-head and uop-pipe gaskets.

If they check out OK, I would then check compression - easy enough to do yourself if you're handy with a spanner and have a compression tester (if not, they're about £20; or get Len to check it from you).

 

Where did you get the td05-20g, Its no an ebay one is it.

 

i had issues with my car when i was running a md321T but i was on a 2004 WRX engine. so i knew i wouldnt make the magic power figs i was wanting.

Never the less i struggles to get any were past 400bhp. for the same reason, it just wouldnt take any more ignit timing, i replaced the plugs and coil packs and hey presto for soem reason it sorted its self out

 

Second this. Where did you get the turbo from?

 

excuse my ignorance lads but how would the turbo that he is running effect the ammount of ignision timing the car would take..???

 

Thanks for the responses guys; hi Tim, yes that was me on Friday, hope your car mapped ok? You're right about the sound of the car, since the ported headers and up pipe were fitted the car has not sounded quite right so maybe there's a leak somewhere. I'll get Len at S4U to do a compression check too.
Re the turbo I got that from Harvey along with the ported headers and up pipe so not an Ebay Chinese special.

 

I think they have strayed past the ignition timing to is it a cheap ebay copy turbo not a genuine artical

 

Oh, yes, very OK...516bhp and 487ftlb

Sounds like a logical first step - as has been pointed out, an inability to take timing will not be down to the turbo.

Good luck getting it sorted.

 

It will be the genuine article if it is from Harvey. Get checking for leaks as a 20g should be making high 300's if not more

 

From TD05-20G just 338BHP?
That's shocking result,this power figure you can get from "good one" VF35.
This 338BHP is not WHP(at wheels)?
With your current setup my guess will be around 370 or 380BHP,not 338BHP.One guy from SurreyScoobies get from TD05-18G around 360BHP.

 

id defintley get the car up on some ramps and check for leaks on your uppipe gaskets and dwon pipe as well and even signs of the header were they join the heads and maybe chekc your tmic pipes for splits

 

sorry to jump on but trying to get hold of andygreer he doesnt seem to look at his pm,s so he might check this listing again and see this sorry again

 

I had problem before as well, went through two turbos, and still no power.

But headgaskets went and swapped engine instead, and made good power.

Not sure why, just one of those things.

 

Got it bud and Replyed

 

What plugs are you running, which gap on them, and how old are they??.

 

Running NGK PFR7B plugs, changed at service 9,000 miles ago. Thanks to all for the suggestions, I'll check for leaks first and see what happens.

 

Any progress?

 

Don't forget that he's still running the panel filter - so prob wouldn't make much past 350? So that'd be a potential bottleneck.

Or is the New Age OEM airbox setup much freer breathing, and therefore not a problem?

 

eBay 20g?
Panel filter and standard induction good for the 400bhp

Tony

 

Thought so (but wasn't certain).


Yeah, smart money is on the 20g being less than effective, then...

 

"Re the turbo I got that from Harvey along with the ported headers and up pipe so not an Ebay Chinese special"

 

Sorry, overlooked that in OP's post.

...In that case, turbo/breathing won't be the problem, then...

 

Don't think you mentioned the fuel used? Assuming it is either V-Power or Momentum?
If the ECU hears a bit of det. it will pull the timing, but there again I'm sure JGM would have been aware, if that was the case!

JohnD

 

What mileage has it done ?
Are there any outstanding issues ?

dunx

 

LOL @ all of this, did people miss the part where he said it was not taking the timing needed to give decent results?

All i have seen is "ooooo check yer dustcaps they might be leaking" nonsense

 

Micky: Spot on mate. Amazing how many people have a view but either can't read or are too lazy to read the thread but still have to have their 2p worth.
Simon has already told me the problems are not related to my turbo which holds boost nor my headers and I understand Paul accepts this from my last conversation with him.
I have made an offer to Paul to resolve the issues with his car or at the very least accurately identify the cause of the lack of power and if I fail to do either make no charge. I am always up for a challenge and await information requested from Paul and his feedback.

 

Yeah, but it obviously begs the question: WHY is it not taking timing - i.e. what's at fault?

Or is that an impossible question to answer until logging has been carried out, or something?

 

Heavy oily deposits wouldn't help, such as might be found on a worn high mileage engine...

Mine has crisp'd a couple of valves but still goes like stink.

A bit of "history" would help any attempt at diagnosis.

IMHO.

dunx

 

There won't be any logging if my offer is taken up, just common sense, systematic thorough investigation working through the car logically, carefully and progressively. The fault is probably not obvious or it may be a series of faults as both Simon and Subaru4U have spent time on this vehicle and I understand that it was already low on power before the current round of mods.