Changing To Stock Intercooler

[Cefi_A31]

Guys....hope you might give me a clear point of view here....

decided to replace my current GTR front mount intercooler to stock side mount intercooler....this is due to a lag and bad throttle response for my RB20DET with standard turbine...to sucks for city driving but ok for highway @ "wangan" driving...

my spec :

GTR Intercooler

Stock RB20DET internals

Stock RB20DET turbine

Walbro Fuel Pump (without Fuel Regulator but will install soon)

40mm wastegate

3" straight piping with Megaphone Mufflers

Proof Sheepdog blowoff valve

set the boost at 0.5 bar (previously at 0.8 bar but as the rpm reached 6.5k rpm suddenly boost preasure gone!!!...)

what i am facing now is

i have to rev high if wanna built power for overtaking cars or changing to lower gear...i heard that is normal for RB20DET to rev high to generate power....in 4th or 5th gear if i floor the throttle on the spot the rev wont get higher than 4k rpm and feel like fuel cut symptom (not enough fuel to the engine)....but if i floor it slowly no problem but i have to maintain boot at 0.1 bar...

guys pls help me....

cause that i belived....

1. could be Air Flow Sensor prob

2. could be some leak

3. could be no fuel regulator

4. could be incorrect TPS adjustment (because when idle i just press the throttle a bit and then the rpm drop slightly and when a press a bit more then the rpm raises)

5.could be of GTR intercooler

Edited November 28, 2009 by Cefi_A31

[Nic_A31]

Bigger intercooler shouldnt make too much of a difference, depending on how long your return pipes are.

Adjust your actuator for boost to kick in lower maybe?

If you go back to SMIC, use an R34 intercooler...it fits with some adjusting and have heard it gives better response.

[Dorigecko]

cooler won't make a difference i don't think.

Check your AFM for starters, make sure it's working. Either find another to use, or rip yours off and get it tested out.

if it's working, fit the FPR. if that does NOTHING, welll... you had to fit it either way. so, win win.

process of elimination - check your plugs too. specifically check them for detonation.

have you tuned or had it tuned since the fitment of the new fuel pump?

[Nic_A31]

Unlikely to be AFM, unless you've got a pod filter that needs oil, over time that builds up on the AFM.

Plugs are also unlikely to affect power shift in RPM range, since there is no distributor, but check the grounds on the ingition loom and pack.

Check your running voltages too. I replaced my battery and leads, and reseated all the grounding wires I could find in the engine bay, and noticed a decent increase in response and it was more consistent thanks to higher voltages.

Also have a look at the intake pipes for any leaks, and make sure theyre clean.

Check for slack in the throttle cable, and check the idle control and main throttle body.

[Cefi_A31]

well thanks a lot guys for your advice and guide...

after reading all the feedback from you guys...maybe i will start by installing a regulator first..then if the problem still occur might plan to change the open pod filter to new one..cause maybe its to dirty that cause air restriction into the AFM....third maybe will replace all the wiring loom cause when inspected at the w/shop the previous owner just mix it between A31 and R32 (d**m) that can give a big impact to...

will update the progression soon....