Hi guys got a z4 96 wrx, just soldered in a polar chip but there is absolutely no difference, I did cut the j1 resister, do I need to reset the ecu aswell? Can't see why as it has been off the car for an hour?

Pretty upset, was expecting a nice increase in power?

 

Is it a genuine Polar Performance chip ?

Scott hasn't marketed these for a while (ScoobyECU), did your's come from Major Sarcasm on Scoobynet ?

Shaun

 

Deffinately something up there.

 

No it's a genuine Scott t chip, he recently got rid of 4 via the for sale ads.

Just took it for a longer drive, there is a tiny tiny tiny difference if that, the revlimit is still 7250, but the speed cutoff has gone no longer 112 as tested on a private road. It's tricky as I don't have a boost gauge, I can't tell if there is anymore boost.

Was rr'd couple weeks back and only managed 243.8 with z4 and decat zigen border exh was only hitting 0.8 bar back then.

Maybe I have a weak actuator???

 

I noticed mine instantly. Do you have a boost gauge? You should see if there is a raised boost limit.

Just noticed you don't as you posted at the same time!!

 

Have you checked you coil packs for cracks? (Under the rubber tips)

 

I'm not getting any misfires or uneven running to suggest probs with coils? Running fine, just slow!

 

Have you put it in diagnostic mode - connected the green connectors under the steering column?

 

I havnt, I'll go and have a go now, cheers for advice guys!!

 

Well this is a strange one, in diagnostics mode getting a nice constant pulse saying everythings ok.
BUT in reset mode with both plugs connected I'm getting three long two short I think which is o2 sensor?? Ecu managed to reset but now feels even slower!! Argrrhhhh!

 

you need to fit a boost gauge to find out if it boosting right.
a standard z4 ecu should be 0.87 bar so check that you get that from the z4 ecu without chip. then you know if you have a boost issue.
the gains from a z4 ecu are not massive as the z4 should make about 260ps anyway.

 

i would go with a weak actuator as others have said, and fit/borrow a boost gauge the fact the car is running with the j1 link cut means its definitely running off of the chip.

 

Thanks for the advice guys, gonna get a new o2 sensor on it then a boost gauge I think..

 

I just got back from my first run after fitting a couple of hours ago and all I can say is wow , it made a huge difference to my car, best money I have spent so far. It pulls so much harder now, really throws me back in the seat.

Good luck with finding a solution.

 

Thats it fella rub it in........

 

Have you got any other mods on the car? My 95WRX was RR'd at 287bhp with I/C and full de-cat with the Z4 ECU, I fitted a polar chip and was also dissapointed could be a similar issue with your car???

 

My car runs a full decat, 5zigen border exhaust, am sti v2 intercooler, and hks panel, and some bizarre equal manifold must be jap as is normal steel and not a shape I've seen for sale over here. I think I may have a slight leak in the manifold though, as it's strange that I'm diagnostics mode it says all ok nut in reset mode shows code 32 for o2 sensor a slight leak may throw the a fault up when the o2 sensor is in fact ok??? The manifold is going to have to be replaced as its lost the burble as is too raspy. Next month will throw a STD manifold on with updated uppipe and see what happens. I'll get there in the end.....

 

Sounds like you've got boost control issues, maybe pipework restrictor missing.

 

id have thought the leaky headers are causing boost to drop and the chip has further pronounced the propblem.