really annoying bog between shifts rb20det

Discuss the RB20, RB25 and RB26 series engines.
turbocrisper
Posts: 63
Joined: Mon Mar 06, 2006 6:10 pm
Car: 89 Nissan 240SX hatch RB20DET

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Here is the senario, I mash the throttle in any gear and when I shift quickly into the next gear my car falls on it's fase and I mean REALLY like I turned the ignition off when slamming back on the throttle after the shift. After a second or two it resumes pulling hard till the next gear. Also, say mid corner, on the track when slamming back on the gas it does the same thing. My car has done this since the rb20det was installed when it was stock with the sidemount. My current setup is, romtune ,t3t4 .63ar hotside, tial 38mm wg 500cc injectors, re-circulated hks ssqv, and the maf in the turbo intake pipe "not blow through", evo 8 fmic all hard piping and 4 coulpers (all tight) , 3" turbo back exhaust with cat. My datalogger says all my AFRs are correct. I don't know what else to do. I am at the mercy of all that is NICO


zdonner
Posts: 266
Joined: Sun Oct 29, 2006 4:07 am
Car: 1991 240SX SE Hatch
Location: Waycross, GA

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I'm not an expert, but sounds to me like I'd check out that Romtune, sounds like your computer is to blame.

Sil240
Posts: 2973
Joined: Mon Apr 28, 2003 5:26 pm
Car: Nissan S13 "The One Cam Wonder"

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Your BOV is recirculated huh???Umm did you make sure to check that there is no leak.Because my friend had the same problem, but because he was blowing off to atomosphere.

Dunno interested in finding out what is causing that.

Yellow4g63
Posts: 3718
Joined: Mon Jan 20, 2003 6:07 pm
Car: 95 Nissan RB20 240SX RB20
91 Nissan NX2000 VE power
95 Nissan 240SX Stock
Contact:

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check for leaks and make sure the bov is reciring back into the intake. could be the ECU tho.

turbocrisper
Posts: 63
Joined: Mon Mar 06, 2006 6:10 pm
Car: 89 Nissan 240SX hatch RB20DET

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there are no leaks i pressure tested and i have an actual recirc fitting on my ssqv it did it before the romtune and it also does it if i hold the throttle steady at 5600 rpm in 2 gear and nail it , it will stumble like the accelerator pump is broken on a carbed car

wob
Posts: 28
Joined: Tue Jan 23, 2007 11:41 am
Car: 93 240sx fastback in the works

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If ur rom tune is fine, and there's no boostleak.. Maybe check the igniter... Or each individual coil... Even a sticking clutch can be to blame

zdonner
Posts: 266
Joined: Sun Oct 29, 2006 4:07 am
Car: 1991 240SX SE Hatch
Location: Waycross, GA

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My BOV is venting to the atmosphere, not by my choice it will be re-circed soon but I don't have any problems like that, only issue I have is running rich as hell and if I get on it and then put it in neutral rather than revving down the gear for a bit then it shuts off.


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