Boost Stutter? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

bfeng24 · 06-23-2008, 11:20 AM

I have a 240 with an sr20 swap, it drives ok, when i reach higher rmps in each gear it seems to stutter (around 7-10 psi), its not really a hesitation. I just replaced the maf with a z32 but that did not help. Any suggestions?
Thanks

turns101 · 06-23-2008, 11:31 AM

Get back to the basics

Plugs, wires, timing
Fuel filter
air filter

Check all of that forst.

Are you having any CEL codes?

clark · 06-23-2008, 11:51 AM

when you swapped in a z32 maf, did you do anythign to compensate for the different pinning ?

but what was already stated, start with the basics. sounds fuel or timing related.

Z U L8R · 06-23-2008, 12:04 PM

sounds like you're blowing out spark. lower the plug gap to .028 you should be running an ngk bcpr7es or bkr7e.

Dave

SuicidnS13 · 06-23-2008, 05:18 PM

Sounds like either a boost leak or spark blow out.

DirtyS14 · 06-23-2008, 09:17 PM

Quote:

Originally Posted by Z U L8R

sounds like you're blowing out spark. lower the plug gap to .028 you should be running an ngk bcpr7es or bkr7e.

Dave

Yep thats exactly the problem I had. Plugs were too hot. I put in some bkr7e plugs and problem went away, runs great now.

Definitely try getting some colder plugs.

06-23-2008, 11:20 AM	#1
bfeng24 Join Date: May 2008 Location: Colorado Age: 34 Posts: 14 Trader Rating: (0) Feedback Score: 0 reviews	Boost Stutter? I have a 240 with an sr20 swap, it drives ok, when i reach higher rmps in each gear it seems to stutter (around 7-10 psi), its not really a hesitation. I just replaced the maf with a z32 but that did not help. Any suggestions? Thanks

06-23-2008, 11:31 AM	#2
turns101 Zilvia Junkie Join Date: Feb 2006 Location: SoCal Posts: 423 Trader Rating: (0) Feedback Score: 0 reviews	Get back to the basics Plugs, wires, timing Fuel filter air filter Check all of that forst. Are you having any CEL codes? __________________ -Jeff Abbott. Big white guy, little green car. late spooler

06-23-2008, 12:04 PM	#4
Z U L8R Zilvia FREAK! Join Date: Jan 2007 Location: Georgia Age: 43 Posts: 1,194 Trader Rating: (0) Feedback Score: 0 reviews	sounds like you're blowing out spark. lower the plug gap to .028 you should be running an ngk bcpr7es or bkr7e. Dave __________________ RB25 280z GT30/76R 441hp/381tq 11.9@125

06-23-2008, 11:51 AM	#3
clark Zilvia FREAK! Join Date: Mar 2008 Location: new york Posts: 1,035 Trader Rating: (1) Feedback Score: 1 reviews	when you swapped in a z32 maf, did you do anythign to compensate for the different pinning ? but what was already stated, start with the basics. sounds fuel or timing related.

06-23-2008, 05:18 PM	#5
SuicidnS13 Zilvia FREAK! Join Date: Nov 2007 Location: Las Vegas, NV Posts: 1,479 Trader Rating: (27) Feedback Score: 27 reviews	Sounds like either a boost leak or spark blow out.