problem with boosting!!! - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

TheSparo · 03-23-2004, 04:49 PM

i got my MBC today and hooked it up, well i have it set to about 12ish PSI, and when at about 10psi it starts to pop, like the motor is misfiring, but i might be descibing it wrong. i have a redtop w/ FMIC, type s bov w/o recirc, stock DP, 3" catback.
any ideas, dont know what to search for, i searched for bost cut, but didnt help
-Jeff

TheSparo · 03-23-2004, 06:33 PM

it was like 60* or so outside when i did this, and i turned it down(boost) to right around 10, i was at full throttle, could it be the fuel cut? too lean?
i checked my plugs yesterday and they seemed to be in good condition, but the top part over the electrode was somewhat light grey/white, not really white but not dark, i wiped them clean and put them back... it only happens at high rpms seemingly

TheSparo · 03-24-2004, 02:34 PM

hmmm maybe could it be fuel cut? anybody wanna help?

Yoshi · 03-24-2004, 02:44 PM

what's your fuel pressure read?
is it going up as your boost builds?

TheSparo · 03-24-2004, 05:32 PM

dont have a fuel pressure gauge...
btw i am running a walbro 255lph

03-23-2004, 04:49 PM	#1
TheSparo Zilvia FREAK! Join Date: Sep 2002 Location: Athens/Chattanooga/ Cookeville/Morristown, TN Age: 39 Posts: 1,141 Trader Rating: (0) Feedback Score: 0 reviews	problem with boosting!!! i got my MBC today and hooked it up, well i have it set to about 12ish PSI, and when at about 10psi it starts to pop, like the motor is misfiring, but i might be descibing it wrong. i have a redtop w/ FMIC, type s bov w/o recirc, stock DP, 3" catback. any ideas, dont know what to search for, i searched for bost cut, but didnt help -Jeff __________________ 89 240 SR powered... ummm i promise its stock

03-23-2004, 06:33 PM	#2
TheSparo Zilvia FREAK! Join Date: Sep 2002 Location: Athens/Chattanooga/ Cookeville/Morristown, TN Age: 39 Posts: 1,141 Trader Rating: (0) Feedback Score: 0 reviews	it was like 60* or so outside when i did this, and i turned it down(boost) to right around 10, i was at full throttle, could it be the fuel cut? too lean? i checked my plugs yesterday and they seemed to be in good condition, but the top part over the electrode was somewhat light grey/white, not really white but not dark, i wiped them clean and put them back... it only happens at high rpms seemingly __________________ 89 240 SR powered... ummm i promise its stock

03-24-2004, 02:34 PM	#3
TheSparo Zilvia FREAK! Join Date: Sep 2002 Location: Athens/Chattanooga/ Cookeville/Morristown, TN Age: 39 Posts: 1,141 Trader Rating: (0) Feedback Score: 0 reviews	hmmm maybe could it be fuel cut? anybody wanna help? __________________ 89 240 SR powered... ummm i promise its stock

03-24-2004, 02:44 PM	#4
Yoshi Post Whore! Join Date: Jul 2001 Location: Washington Age: 48 Posts: 3,003 Trader Rating: (1) Rides Gallery: Yoshi Feedback Score: 1 reviews	what's your fuel pressure read? is it going up as your boost builds? __________________ www.360realms.com/S13-S15

03-24-2004, 05:32 PM	#5
TheSparo Zilvia FREAK! Join Date: Sep 2002 Location: Athens/Chattanooga/ Cookeville/Morristown, TN Age: 39 Posts: 1,141 Trader Rating: (0) Feedback Score: 0 reviews	dont have a fuel pressure gauge... btw i am running a walbro 255lph __________________ 89 240 SR powered... ummm i promise its stock