tblandy

Hi, ive just baught a 1996 WRX Wagon version 2.

Seems to be holding back at high revs (over 5.5k) ?

It has an after market downpipe fitted with no lambda sensor fitted, is this ok? Also has sports 'high flow' cat and stainless exhaust.

Also i got a version2 Type RA ntercooler (looks similar to mine) and air flow meter with the car, will these fit and benefit at all?

It seems to boost around 0.6-0.7 bar, is this upable and whats needed to do it?

Any help appriciated, Ty

jengis

Is the sport cat in the down pipe? I doubt that would be any problem as there is one in the headers that the ecu reads primarily.

Is turbo louder than normal? whistling noise?
I had a reducing boost problem that eventually turned into a hestitation and missfire under load at high revs. It was caused by a boost leak between turbo and intercooler. The hose on these early cars is poor, check the connections and tighten or replace the hose with a silicone kit. Mine had become damged at the conection between turbo and intercooler hard hose. (I bet this is your problem)

Other causes of hesitation are broken coil packs or faulty/incorrectly gapped plugs. Although unlikely to cause low boost.

Check the boost pipes to the boost solenoid for oil, if solenoid is cantaminated it can become sticky and be faulty in opperation. It can be cleaned but if the pipes are dry then leave that idea for now...

Do you have a aftermarket dump valve? If this is poor quality it could be leaking boost here. Some are adjustable and badly set-up, some are adjustable, some are just bad (so i haave heard, I have an HKS Vent To Air and it is fine, so not all VTA are bad, by the way).

Hope that helps get you started, I'm sure others will add.

Kev

edit:

0.6-0.7 bar is low, but most get 0.5 when in "limp" mode ( It should be around 0.8 - 0.9 under load at high revs). It does seem like a boost leak. try the different intercooler an then the maf systematically. see what happens!

tblandy

Yes it does seem to be noisy on spool up compared to my friends uk 2000 V3, it has mainly silcome hose, and ive checked the small boost pipes and cleaned the solinoid, i will check all intercooler hoses tomoro though.

the sport cat is in the down pipe yes, its from Jap performance Uk or something, receipt was around £280

Will the Type RA AFM fit and work ok? i was thinking maybe it is the afm holding it back?

What boost should i be seeing?

Thanks, Ty

jengis

my '96 v2 sti is 0.9 as standard and I see 13 psi (the approx equivalent) now my hoses are secure. I think a wrx should be sililar but not sure, 0.6 is definately too low. how are you measuring it?

not sure about the campatibility of the MAF but it should be obvious if it will phisically fit, is so use it as an elimination excersise.

tblandy

ok ive fitted the incooler and airflow meter this morning, no real change.

I also found a spli vacume hose, now seeing 0.7 bar via mechanical guage fitted to the car.

Still seems to be noisey when building boost and dump doesnt sounds stock, buit i cannot seem to find aftermarket Bov, how do i check the factory fit item and where is it?

tblandy

What ECU can i fit to see more boost and power?

jengis

you mention a split vacuum hose, did you sort this?

http://www.scoobypedia.co.uk/index.p...ngInstructions

the above may help locate the dump valve

dj219957

the wrx wagon does hold back at the top end. it runs a different turbo and map compared to the saloon. it runs 10psi, dropping to 6.8psi at the top end.
the saloons run about 12psi to the red line. if you want you can fit a saloon turbo and ecu. its a straight swap.

tblandy

whats the best ecu for my engine?

current ecu says - 3B . 22611 AC281 . A18-000 D19 . 6410

dj219957

get a z4 ecu from a saloon or buy one of the chip from major sarcasm on here. you will need to fit a td05 if you fit a z4. major sarcasm does do a chip for the td04 turbo you have.

tblandy

What will give the best drive and least headache?

fastboyslim

iTrader: (2)

Hey guys my V2 Sti wagon came with a Z4 ecu and running a TD05 at 260bhp. Get your vin code and do a search for your car. I did and got loads of info.