Is there any way of finding out if a car has been chipped before? The reason I ask is because I recently had my car rolling road tested at Dyno Dynamics and it had 195bhp at the wheels (254bhp at the flywheel and 274 lbft torque at flywheel).

Having researched the MY99 Impreza it looks like it has 215bhp as standard and similar torque numbers. The only mods my car has is a decatted downpipe and a non standard backbox. I also had an electronic boost controller fitted recently.

It seems strange that my car was tested at 40bhp and 60 lb ft torque more than the standard model just from a different exhaust?

Is this normal, or if not, is there a way I can find out if it has been chipped? I've heard ECU's such as the Prodrive ones or Sti ones can be plugged straight in?

 

I forgot to mention, what puzzles me is that 254bhp doesn't seem a lot if it has been remapped, yet 274 lbft torque does seems about right.Yet these figures seem a lot more than stock figures.

 

If your car had a full decat along with a decent panel filter and was remapped then you would see around 275-280bhp at the flywheel.
250ish bhp seems about right with just a decat.
Yes the ecu on the MY99 cars can be remapped

 

Hi, yea it's got a green panel filter but wouldn't have thought it would much difference. Also, I believe the UK model like mine has 2 catalytic convertors and one has been removed on the downpipe.

It just seems strange to me that it would produce about 40bhp more and 60 lb ft more from a different exhaust, but I'm not complaining

I'm also running it on Super unleaded all the time. Maybe when the bhp figures were originally released by subaru, they ran it on unleaded.

 

hi i hav a subaru impreza 2001 wrx with pro drive pack..i hav just found out my forge dump valve is sticking and ther is a problem with 1 of the springs..wud this cause my car to run a little flat nd run rich..its not ticking over properly it kangaroos slightly nearly everytime i pull away..cud this cause this..i hav just bought a bailys dump valve and it will be fitted on friday will i feel the difrence...also wot is remapping and how much does it cost..any help wud be greatful

 

i paid £139 for my dumpvalve

 

I don't really know the answer to your question sorry. It be better to start off a new thread so that someone can answer it accurately. Remapping is when the car's original ECU data is adjusted by a 3rd party tuning company in order to increase the car's performance. I.e by increasing the boost pressure etc. It's around £500 for a good remap.

 

i want to start a new thread but i dont no how to can u help please

 

In this same section (General Technical) you'll see a list of threads - such as this one. just above that there's an orange bar and an orange button that says new thread (near scoobysport logo). Click that and off you go

 

What has the boost controller been set to? The main reason you fit a boost controller is to wind up the boost pressure for more power. Do you have a boost gauge fitted? if so, what pressure does it read on full boost?

 

Decat and a generous rolling road wouldn't be far off what you achieved BHP IMHO. Although the torque figure is high ?

 

The boost controller has been set at maximum 1 bar by the company that fitted it / and rolling road tested it.

I always thought the boost controller was just to limit maximum boost and keep it more consistant to avoid things like fuel cut off.

Btw, I forgot to mention I haven't got a seperate boost guage, but the Greddy Profec electronic boost controller shows boost levels on the screen (never goes higher than about 0.95 to 1.0 bar)

 

Well I should imagine the 1 bar of boost might have something to do with it.

I thought standard boost was about 0.8. I know my MY99 sticks around 0.8 to 0.85 most of the time dropping to 0.7 at high revs.

Which boost controller do you have? I'm tempted with one for mine.

Matt

 

PS Ignore the question. It's early and I didn't read all of the thread...

 

sure I read somewhere that MY99 was 0.9 bar as standard?
Gonna get my gauge fitted soon...see if it's running correctly!

 

Some cars respond better than others, removing the cat from the downpipe will make a great difference to start with, higher octane will help a bit as will the panel filter, but nothing major.

Sounds like its just been de-catted but not yet mapped IMO.

 

if u have a boost controller in this will give u higher figures for the simple fact that u r running 1 bar of boost pressure there for creating more power also the decat exhaust and filter will help but remember u cant always go on what the rolling rd figures give u as they differ for 30 - 60 bhp extra or less in extreme cases if u put it on again it would or could so u more bhp or less depends on the heat of the place etc etc in my opinion ur car hasn't been remapped with these figures!!! hope this helps u!

 

Cool thanks for the advice, I think I understand the power output a bit more now. I also agree that the car has very likely not been remapped.

If maximum boost is at 0.9 on the MY99 UK Impreza I'm guessing the maximum before it has fuel cut off is 1.0bar therefore if the Electronic boost controller allows it to boost beyond 0.9 bar but no more than 1.0bar the power must be increased? I might be talking rubbish though :-)

 

You're just about spot on with that, fuel cut will be somewhere between 1.0-1.1bar depending on the ecu variant.
1.0bar is higher boost than standard, hence more bhp, so again yes..... you're getting it now, not talking rubbish, lol.

 

Just to resurrect an old thread. I had my car in at a garage earlier for them to investigate why they were getting no readings from the car diagnostics port and it turns out it has an aftermarket APEXI ecu. Question has been answered :-)

 

I'm guessing the APEXI ecu still needs the MAF to operate. I wonder why it was changed when the ECUTEK could have been remapped? Apparently the APEXI is supposed to be better though?

 

Swings and roundabout really, both are good, the OE ecu has knock control, the apexi doesn't, but the Apexi can use a commander to display all sorts of useful data, but then again the OE ecu can have a delta dash fitted.

 

Just wondering why a previous owner had it fitted as it probably wasn;t cheap to do. It probably would've been cheaper to just remap via ECUTEK wouldn't it?