SR is having a mild boost issue??? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

TurbLu · 11-04-2006, 07:04 PM

When regularly accelerating (50% throttle) the engine will rev and boost all the way to 8k if needed... But at Full throttle it will have some type of limiter kick in at 5300rpms in any gear.. it feels like one atleast... or maybe a major misfire. Could it be my spark plugs???

punxva · 11-04-2006, 07:51 PM

yea id start with your spark plugs, then check your maf, then also check for boost leaks

GSXRJJordan · 11-04-2006, 09:04 PM

it's not a limiter, its detonation. The end result feels like a limiter, but its the computer saying theres something seriously wrong with the A/F mix, due to too much air or fuel or not enough spark, so the computer goes into 'failsafe' and kills power. I'd suggest checking your plugs, gapping them if you havent done that, and checking for boost leaks - if that doesnt fix it, replace those nasty stock injectors with some bigger new ones

staygold24 · 11-04-2006, 11:20 PM

whats detonation feel like? sometimes my car will pop twice under full throttle but i dont know if thats normal or not. I just turned up the boost recently

GSXRJJordan · 11-05-2006, 01:23 AM

The popping at full throttle is from the exhaust, right? Not the cylinders themselves? I've had problems with some SR's TPSs, which arent calibrated, or sometimes wiring issues stop it from getting a full 5V... anyway, most of those are fixable, and not a huge issue none-the-less.

TurbLu · 11-05-2006, 03:34 AM

OK guys heres my update-

Took out my plugs - GHOST WHITE!!! - LEAN!!!! - What could cause this:

I just recently had an issue with my stock fpr going out once I installed the Walbro. So I purchased a megan racing one of EGAY and set it for 42psi. Pulled out my plugs and their white. So I turned it up to 55psi for giggles and it still came out white... Shouldnt it have been running way rich??? What else could it be? Im running stock boost (8-9 psi), stock injectors, side mount and 91 octane.

TurbLu · 11-05-2006, 03:34 AM

Oh stock DP and exhaust too....

TurbLu · 11-05-2006, 11:59 AM

bump for morning help...

Im currently on the way to the yard to pick up another stock ka FPR..

georgesal · 11-08-2006, 08:35 PM

Hey when you figure out what is the problemwith your sr le tme know i have the same problem minus the backfiring, s13 blacktop w/ s14 turbo nismo fuel pressure regulator, walbro fuel pump

TurbLu · 11-08-2006, 10:33 PM

Yea the problem is my TPS... I only get it at WOT.... I spilled gas on the sensor when changing the FPR... that did it.... LOL

11-04-2006, 07:04 PM	#1
TurbLu Zilvia Member Join Date: Sep 2006 Location: Las Vegas Posts: 197 Trader Rating: (0) Feedback Score: 0 reviews	SR is having a mild boost issue??? When regularly accelerating (50% throttle) the engine will rev and boost all the way to 8k if needed... But at Full throttle it will have some type of limiter kick in at 5300rpms in any gear.. it feels like one atleast... or maybe a major misfire. Could it be my spark plugs???

11-04-2006, 09:04 PM	#3
GSXRJJordan Post Whore! Join Date: May 2006 Location: San Diego, CA Posts: 9,135 Trader Rating: (19) Rides Gallery: GSXRJJordan Feedback Score: 19 reviews	it's not a limiter, its detonation. The end result feels like a limiter, but its the computer saying theres something seriously wrong with the A/F mix, due to too much air or fuel or not enough spark, so the computer goes into 'failsafe' and kills power. I'd suggest checking your plugs, gapping them if you havent done that, and checking for boost leaks - if that doesnt fix it, replace those nasty stock injectors with some bigger new ones __________________ Jordan Innovations has a new web site! www.JordanInnovations.com -- All your favorite FD Pro Drifters love it, trust me -- www.JordanInnovations.com

11-05-2006, 01:23 AM	#5
GSXRJJordan Post Whore! Join Date: May 2006 Location: San Diego, CA Posts: 9,135 Trader Rating: (19) Rides Gallery: GSXRJJordan Feedback Score: 19 reviews	The popping at full throttle is from the exhaust, right? Not the cylinders themselves? I've had problems with some SR's TPSs, which arent calibrated, or sometimes wiring issues stop it from getting a full 5V... anyway, most of those are fixable, and not a huge issue none-the-less. __________________ Jordan Innovations has a new web site! www.JordanInnovations.com -- All your favorite FD Pro Drifters love it, trust me -- www.JordanInnovations.com

11-04-2006, 11:20 PM	#4
staygold24 Zilvia Addict Join Date: Aug 2005 Location: St. Simons Ga Posts: 673 Trader Rating: (0) Feedback Score: 0 reviews	whats detonation feel like? sometimes my car will pop twice under full throttle but i dont know if thats normal or not. I just turned up the boost recently

11-05-2006, 03:34 AM	#6
TurbLu Zilvia Member Join Date: Sep 2006 Location: Las Vegas Posts: 197 Trader Rating: (0) Feedback Score: 0 reviews	OK guys heres my update- Took out my plugs - GHOST WHITE!!! - LEAN!!!! - What could cause this: I just recently had an issue with my stock fpr going out once I installed the Walbro. So I purchased a megan racing one of EGAY and set it for 42psi. Pulled out my plugs and their white. So I turned it up to 55psi for giggles and it still came out white... Shouldnt it have been running way rich??? What else could it be? Im running stock boost (8-9 psi), stock injectors, side mount and 91 octane.

11-05-2006, 11:59 AM	#8
TurbLu Zilvia Member Join Date: Sep 2006 Location: Las Vegas Posts: 197 Trader Rating: (0) Feedback Score: 0 reviews	bump for morning help... Im currently on the way to the yard to pick up another stock ka FPR..

11-08-2006, 08:35 PM	#9
georgesal BANNED Join Date: Oct 2006 Location: Los Angeles Age: 40 Posts: 842 Trader Rating: (2) Feedback Score: 2 reviews	Hey when you figure out what is the problemwith your sr le tme know i have the same problem minus the backfiring, s13 blacktop w/ s14 turbo nismo fuel pressure regulator, walbro fuel pump

11-08-2006, 10:33 PM	#10
TurbLu Zilvia Member Join Date: Sep 2006 Location: Las Vegas Posts: 197 Trader Rating: (0) Feedback Score: 0 reviews	Yea the problem is my TPS... I only get it at WOT.... I spilled gas on the sensor when changing the FPR... that did it.... LOL