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

240sxredtopdrift · 06-03-2006, 10:56 AM

i bought an sr20det redtop to put in my S13 and I’ve been having a lot of problems getting it to run good. I had a lot of problems with leaking intercooler piping finally i got it sealed but its still bucking and missing. When it starts to miss I just let up a bit on the throttle it stops. I checked the plugs and there white so I’m afraid to blow my motor. i have a front mount intercooler, Greddy Blow off valve, walbro 255 fuel pump, 3" Exhaust everything else on the motor is stock. I noticed that there is no speed limiter! I was wondering if my computer was modified so i checked inside no daughterboard. does anyone know what could be wrong? My computer code is 55, no problem. Idles great(after MAF reground). I have a air/fuel ratio gauge at idle it goes lean and when I’m at 25% throttle it goes to rich but when i floor it bucks and misses flashes LEAN. I have reground my MAF and Oxygen sensor because ohms were high. I checked for leaks between my MAF and turbo. Maybe my MAF is defective what voltage am i supposed to get at 3000RPM? i know diagnosing motor on the net is hard. How can i test other components like fuel pressure and TPS? thanks.

1990 240SX
SR20DET Redtop @ 7psi (4 now)
Megan racing FMIC
3" IC Piping
3" Exhaust (JDM)
Walbro 255LPH Fuel pump
Greddy Blow off Valve Type RS
Clutchmasters stage 1 clutch
Silvia LSD
RSR D1 Spec Polyurethane bushings
Megan Racing Track series fully adjustable Coilovers
Greddy Tower Brace Front
EM tower brace Rear

06-03-2006, 10:56 AM	#1
240sxredtopdrift Join Date: Jun 2006 Location: canada Posts: 6 Trader Rating: (0) Feedback Score: 0 reviews	Redtop i bought an sr20det redtop to put in my S13 and I’ve been having a lot of problems getting it to run good. I had a lot of problems with leaking intercooler piping finally i got it sealed but its still bucking and missing. When it starts to miss I just let up a bit on the throttle it stops. I checked the plugs and there white so I’m afraid to blow my motor. i have a front mount intercooler, Greddy Blow off valve, walbro 255 fuel pump, 3" Exhaust everything else on the motor is stock. I noticed that there is no speed limiter! I was wondering if my computer was modified so i checked inside no daughterboard. does anyone know what could be wrong? My computer code is 55, no problem. Idles great(after MAF reground). I have a air/fuel ratio gauge at idle it goes lean and when I’m at 25% throttle it goes to rich but when i floor it bucks and misses flashes LEAN. I have reground my MAF and Oxygen sensor because ohms were high. I checked for leaks between my MAF and turbo. Maybe my MAF is defective what voltage am i supposed to get at 3000RPM? i know diagnosing motor on the net is hard. How can i test other components like fuel pressure and TPS? thanks. 1990 240SX SR20DET Redtop @ 7psi (4 now) Megan racing FMIC 3" IC Piping 3" Exhaust (JDM) Walbro 255LPH Fuel pump Greddy Blow off Valve Type RS Clutchmasters stage 1 clutch Silvia LSD RSR D1 Spec Polyurethane bushings Megan Racing Track series fully adjustable Coilovers Greddy Tower Brace Front EM tower brace Rear