Hi there guys - pick up my 93 WRX on Saturday, which I have traded my Honda Prelude vtec in against.
Can anyone tell me what would be the boost setting for the car with a full decat exhaust and induction kit? - I don`t know if there has been any work done internally on the cars engine.
What is the factory boost setting for the car and what is the safest setting?
I am considering fitting the Unichip from the Honda onto the WRX - would I be able to tell from the dyno chart what mods have been done and what boost it is running?

Sorry for all the questions - new to turbo motors after having the vtec for so long.

Thanks for any help. Cheers.

 

Boost target should be 11.47psig with std ECU but will prolly peak higher due to decat - ECU boost cut is ~14.57psig

Cheers

 

Id remove the 'induction kit'; sell it, and replace it with a good standard filter; they dont help Imprezas at all.

Simon

 

I'm running a 94 WRX with a W9 ECU with full decat and induction kit and get around 12 psi at full boost.

Older cars MAF sensors are less prone to failiure but if you go buy an induction kit make sure it's bolted down/secured properly (vibration can damage MAF) and avoid oiled filters.

 

Following is a quote from Scott T:


Boost Targets & Fuel-Cut Limits
WRX/STi Saloon ECU's 2C, U8, W6, W9 - As above, 11.47psi held to redline. Fuel-cut 14.57psi

WRX (1995/96) ECU Z4 - 12.71psi, dropping to 11.78psi @ 6600rpm. Fuel-cut 15.65psi.

UK/Aus/Euro ECU's V7, 7D and 6D - 11.47psi, dropping to 9.47psi at 6600rpm. With Fuel-cut @ 14.87psi

UK Prodive ECU - 13.33psi (peaks to 13.64 @ 5600rpm, drops to 12.71psi @ 6600rpm). Fuel-Cut 15.65psi.

STi RA (1996) ECU 7K - 13.17psi (peaks to 13.64psi @ 5800rpm). Fuel-Cut 15.96psi.

WRX Wagon ECU V9 - 10.55psi dropping to 6.84psi (starts to drop @ 5000rpm). Fuel-Cut 13.79psi

Z4 and UK Prodrive map are near identicle, with the Prodrive Map running slightly more boost.

IMHO the Z4 ECU is the best stock WRX ECU you can get, as it has much tidier fuel and igntion maps. Comparing it to the earlier ECU's I'm suprised the earlier cars run at all.....

A Z4 ECU will also run fine in a UK and give near UK PPP performance.

 

Hi,

If you are gonna alter the boost with your unichip, which i know nothing about but i suspect emulates a bleed valve and fuel cut raiser, then i would get a knocklink.
Increasing the boost too much can increase pinking or "det" to a level where it can kill the engine.
The knock link will warn you of such problems. £130 ish.


Rather than your uni chip if i were you i would get
a z4 ecu - a very easy upgrade for your car - 10 min job - cost 150 -200 quid. Increases standard bhp from 240ish to 260ish

This is a better/safer way of improving the performance.
With your full decat as well you will see 270bhp+easy

By the way you should be running the car on shell optimax or octane booster if you drive it hard.


Andy

 

Agree fully...Knocklink is a must if you are going to up the power on a Subaru to give an indication of any det problems which can kill the bottom end.

I too have heard good comments on the Z4 ECU...installing one soon with re-map chip.

 

Why would you install a Z4 ECU then a remap chip. The whole point of the Z4 is it has probably the best standard map for pre97 cars but if you then use a remap chip you defeat the object. Just fit the remap chip to your orginal ecu......

Tony.

 

sorry to jump in on this thread... but...

is it possible to fit the Z4 ecu to my JDM wrx wagon (my95) and reap the benifits, or would i have to change all sorts of other things aswell?

 

Totally agree with Tony's statement, there is no point fitting a Z4 then adding a chip as cutting J1 on the ECU makes it read the external Eprom/s.
Not really because the Z4 has the boost map/solenoid duty map set up for a TD05 whereas you have a TD04 fitted to your JDM wrx Wagon - the only way to get round this would be to fit a standalone boost controller or an MBC

Cheers

 

I am running 17psi on my93 WRX and i havn't had any probs as of yet...???

I doing this through using a scoobyECU and a GBE MBC...

I think you should be able to run this sort of boost on a unichip if not more as long as it is all set-up correctly...

G.

 

You need a later cars MAP sensor as the 93 cars original runs out of signal at 1.15bar

The ecu thinks your turbo is running at 1.15 bar but the turbo is at 1.3 bar, not good

Grant

 

"Not really because the Z4 has the boost map/solenoid duty map set up for a TD05 whereas you have a TD04 fitted to your JDM wrx Wagon - the only way to get round this would be to fit a standalone boost controller or an MBC "


Yes the wagon has the smaller turbo so the z4 map is not suitable for it. Agree with above - you could tailer the boost to the td04 with an MBC
Either that or put the td05 on like me td05 go for 200 - 300 quid + fitting


Andy

 

Cheers guys - with regards to running the car on Optimax OR octane booster, can I run the car then on normal unleaded and add the booster?. I ran the Prelude on optimax and sometimes 97 ron but its a pain in the *** because very few places around me actually sell the stuff.
How can I tell what boost my car is running just now then without fitting a boost gauge for example?. Cheers.

 

Don't agree with that. I think he is fine to run over 1.15bar with a MBC (with correct scoobyecu map for this boost level) as the ecu doesn't use the MAP sensor for load.... it's basically just a number. The ECU uses the MAF to calculate load and thus fueling and ignition timing. No point in changing the MAP sensor unless you want the ecu to control boost over 1.15bar.

Tony.

 

i ran an sti 7 k ecu in my 93 wrx what a difference it made the car an animal just watch the rev limit

cheers david

 

my 93 wrx runs 1.1 bar peak and 0.9 hold goes ok but now and again drops to 0.6bar dont know why will have to check hoses

 

When the ECU controls the boost over 1.15bar then it needs a later MAP sensor and if the MBC is plumbed from the turbo nipple to the actuator then the car will run fine without a later MAP................is this correct or am i misinformed

What happens if you have a MBC plumbed into the bottom of the 3 port solenoid, i lost the original resrictor, set to peak at 1.35 and hold 1.2bar. Will this be a no-no on a 93 MAP sensor or did i do wrong fitting a later model MAP sensor

Grant

 

For the ecu to control boost above 1.15bar then yes you do need the later map sensor AND have the ecu remapped to suit the new sensor. You can't just fit the later sensor and expect the ecu to know..... it simply won't work. It will think it's controlling at 0.9 bar but will be running inexcess of this.

IF your using an MBC i'd connect it accross the actuator and nipple only and wouldn't have bothered with the later MAP sensor.

Tony.