Please Troubleshoot: Detonation - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

sepulchral · 05-14-2004, 09:25 PM

I have a SR w/ stock injectors, walbro fuel pump, greddy r spec front mount, gt spec exhaust. When i adjust the boost the car will detonate at a higher rpms, car is fine on stock boost.

A few weeks ago my fuel pump fuse blew i replaced it and the pump's buzzing noise grew way louder. I don't know how that would effect it because stock boost runs fine. Car only detonates when boost is changed. Im using greddy profec b spec 2.

If anyone has any information on what might be the issue for this, please post any solutions/causes.

What i have on my mind now is Bad injectors or badly gapped plugs, bad fuel pump- those are the only things that i can think of.

240eggsx · 05-14-2004, 10:39 PM

Retard your timing a bit.

sepulchral · 05-14-2004, 10:55 PM

any more suggestions

Turbozx · 05-15-2004, 12:48 AM

Check all the basics first.

plug gaps and condition
timing
fuel pressure
TPS

How high a boost does the detonation begin at?

sepulchral · 05-15-2004, 07:13 AM

0.8 bar to 1.0 bar (12-15lbs)

thing is it used to boost and run that perfectly so something must have happened

Var · 05-15-2004, 10:10 AM

carbon buildup? makes higher compression could be caused from running rich > upgraded fuel pump with no fuel controller.

sepulchral · 05-16-2004, 12:40 AM

topdssdddddddddddddddddddddddddd

05-14-2004, 09:25 PM	#1
sepulchral BANNED Join Date: Mar 2004 Location: Midlothian. VA Posts: 2,050 Trader Rating: (0) Feedback Score: 0 reviews	Please Troubleshoot: Detonation I have a SR w/ stock injectors, walbro fuel pump, greddy r spec front mount, gt spec exhaust. When i adjust the boost the car will detonate at a higher rpms, car is fine on stock boost. A few weeks ago my fuel pump fuse blew i replaced it and the pump's buzzing noise grew way louder. I don't know how that would effect it because stock boost runs fine. Car only detonates when boost is changed. Im using greddy profec b spec 2. If anyone has any information on what might be the issue for this, please post any solutions/causes. What i have on my mind now is Bad injectors or badly gapped plugs, bad fuel pump- those are the only things that i can think of.

05-15-2004, 12:48 AM	#4
Turbozx Leaky Injector Join Date: Jan 2003 Location: Pleasanton, CA Posts: 140 Trader Rating: (0) Feedback Score: 0 reviews	Check all the basics first. plug gaps and condition timing fuel pressure TPS How high a boost does the detonation begin at? __________________ 91 Z32 TT, 92 Z32 TT, 90 240 LSX, 09 GT-R, 18 Honda Ridgeline

05-15-2004, 10:10 AM	#6
Var Post Whore! Join Date: Sep 2003 Location: Norcal Age: 43 Posts: 5,032 Trader Rating: (0) Rides Gallery: Var Feedback Score: 0 reviews	carbon buildup? makes higher compression could be caused from running rich > upgraded fuel pump with no fuel controller. __________________ Hi

05-16-2004, 12:40 AM	#7
sepulchral BANNED Join Date: Mar 2004 Location: Midlothian. VA Posts: 2,050 Trader Rating: (0) Feedback Score: 0 reviews	sd topdssdddddddddddddddddddddddddd

05-14-2004, 10:39 PM	#2
240eggsx BANNED Join Date: Dec 2003 Location: nowhere Posts: 136 Trader Rating: (0) Rides Gallery: 240eggsx Feedback Score: 0 reviews	Retard your timing a bit.

05-14-2004, 10:55 PM	#3
sepulchral BANNED Join Date: Mar 2004 Location: Midlothian. VA Posts: 2,050 Trader Rating: (0) Feedback Score: 0 reviews	any more suggestions

05-15-2004, 07:13 AM	#5
sepulchral BANNED Join Date: Mar 2004 Location: Midlothian. VA Posts: 2,050 Trader Rating: (0) Feedback Score: 0 reviews	0.8 bar to 1.0 bar (12-15lbs) thing is it used to boost and run that perfectly so something must have happened