Subaru WRX Forum

Subaru WRX Forum (
-   Bolt-on Tech (EJ255/EJ257 2.5L 2008+ WRX, STi, and GT) (
-   -   Strange Acceleration (

wrxPaulie 05-14-2012 08:17 PM

Strange Acceleration
Hi Guys...

I have a strange thing happening
When I hit the gas hard the car, what it seems like, is going in 2 stages.
Smooth acceleration till around 5k rpm then it almost feels like a very fast
loose of power then the car pulls again.
I mean its in .5sec but i can feel that double punch.
Anyone knows that that could be?
2012 wrx 1120 miles on it with Perrin intake

Paul W.

dillon233 05-14-2012 10:58 PM

Did you tune it

Sent from my Autoguide iPhone app

pzr2874 05-15-2012 06:00 AM

Take it back to the dealer

wrxPaulie 05-15-2012 07:37 PM

Nope no tune
I was told Perrin CAI dont need a tune but now im findin out
I do

You guys the that the intake makes that double pull?

brfatal 05-15-2012 08:38 PM

It potentially could. I know that Perrin has an AP map for their intake.

Take the intake off, reset your ECU, drive around for a little while to let the ECU learn, and then try it again and see if it still does it.

wrxPaulie 05-17-2012 08:54 PM


I drove the car today and i did some hard pulls and the double pull is gone..
I this the computer just had to adjust the difference
The car run normal now

wrxPaulie 05-18-2012 11:00 PM

another update

Just installed the GFB BoV, the 1 i cant change to full circ or BoV
so far car run very nice
at low boost at 3.5k i get a little fluffier but i was told that its oki

bad grocerygetter 05-19-2012 09:46 AM

I would still look at a tune for the Cai man. With the way these cars are tuned from the factory you are pushing your luck. Just saying.

synolimit 05-19-2012 11:34 AM

why do people never read?

take the intake off before you blow the motor, and get a tune ASAP with or without mods.

the OEM tune is junk and knocks like crazy. the pulls you're feeling is a knock event and the motor pulling 2-4* of timing and then giving it back to you. that more then enough to blow a piston ringland.

wrxPaulie 05-19-2012 05:28 PM

I can keep all the parts and just get Cobb tune for intake and GFB?
Would that do it?
i mean safer i guess?

wrxPaulie 05-19-2012 07:39 PM

I took the intake out and OMG, car run soooo much better
much better response and pulls.
Yes, i know ppl are saying don't do it with out the tune
but like most ppl we just do and take it off lol
I guess we hope we wont have to do the tune and get luckey
but not in my case
TYVM guys
I did leave the GFB BpV/BoV on

I will call the dealer and see if they would void the warranty
if I tune it and if it will, then I guess I'll wait
3yr or 36k miles

MR_WRX 05-20-2012 03:37 PM

what did the dealer say?

synolimit 05-21-2012 03:27 PM

i never understood why people say that. whats it matter if it blows at 3k or 36k? you still have to pay for it if you blew it up. why waste your time for 3 years and 36k to drive a pig around?

and as for saying "i guess we hope we wont have to do the tune and get lucky" is crazy talk! if you arent logging your car you have NO idea if you do or dont need a tune for something. so hoping and praying is only going to damage the motor if you havent done so already.

ive said this a million times so one more shouldnt hurt. the OEM tune is garbage and knocks like crazy. anything over 1.8 load especially in the upper RPMs is death to a motor territory. now im not talking about the motor blowing up and killing you but its enough to crack a piston ringland. once a ringland has cracked you lose all power to that cylinder. sometimes 1 down cylinder cant be felt by your normal everyday Joe. most time the ECU doesnt even know there is a problem. you can crack a ringland for exactly what you have done or you can "micro crack' it. if you pulled the piston and magna fluxed it you'll see the micro crack. however no ones gonna do this. once you start tuning and adding more parts and power the crack will grow and blow the motor. this is why you guys gotta read before you start "hoping" everything will be ok. get off the OEM tune and get a stage 1 tune from someone; sooner the better.

wrxPaulie 05-21-2012 07:19 PM

damn.... I got schooled :P

Thanx for the explanation

As for the dealer, I didnt get a chance to call today but I bet they'll be like hellz no
but you never know. The dealer my do the tuning.
I'll keep as posted

Why would the sell a car with such a bad tune then? I don't get it. Why they setting them self up for

bad grocerygetter 05-21-2012 08:39 PM

Good question! I have no idea why the hell they would put such a crap tune on a great platform like the wrx. But alas...its there so all we can do is fix it. Good news is I think with a stage 1 tune you will be happier with the overall feel of the car. You will feel a lot smoother acceleration. And a slight bump in power. I vote start at stage one and let the mod bug dig in :p

All times are GMT -5. The time now is 06:18 AM.

Powered by vBulletin®. Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.

vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
User Alert System provided by Advanced User Tagging v3.0.8pl1 (Lite) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.

For the best viewing experience please update your browser to Google Chrome