how is his possible??? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

180ways2slide · 04-14-2008, 06:17 PM

i never seen this b4. i am running a microtech ltx8s on my sr20det and trying to get the hang of this tunning thing, but how is it possible that the spark plugs foul out so easily. i am using ngk v power-9 and the car idles all day but if i manage to take it up the block it fouls the plugs on 1 pull. plugs are really black and dry not wet at all. has this happened to anyone where plugs fouled out within 2-3 days of purchasing them

i kno i need a tune but after 2 days, 1 or 2 pulls up the block, plugs should of held up no matter how rich im running

Z U L8R · 04-14-2008, 07:02 PM

might as well try known good coolant temp sensor (2 wire for ecu) off a 92 sentra sr20de. check your tps voltage with the throttle body closed 0-1 volt and wide open should be 4-5 volt. also verify correct base timing per fsm, it is 15 degrees advanced ( 15btdc)
gl
Dave

GSXRJJordan · 04-14-2008, 08:50 PM

^^^ Yup, great advice.

If they're not wet, then you're just running incredibly rich. Your base map could be good, I suppose, but somewhere you're dumping a ridiculous amount of fuel in.

gotta240 · 04-14-2008, 08:54 PM

What fuel managment are you running?

edit. i fail at reading

johngriff · 04-14-2008, 08:59 PM

Microtech... unnngggg

do you have a wideband? What are your readings?

Can you do injector phasing? That might be out of synch too.

180ways2slide · 04-15-2008, 05:55 AM

running the microtech ltx8s and 850cc injectors,255 walbro and the wideband reads --- until i tap the gas it goes to 15. so i runs evtremely rich under 10.1

Blown240sx · 04-15-2008, 08:28 AM

Your A/F dont need to much lower than 11.0. Lean it out a bit and see how it does.

johngriff · 04-15-2008, 10:37 AM

Well, your answer is that then.

A car under 10.2 and richer is going to run really really bad. Your tune needs to be at LEAST 10.8/1 for the car to drive smoothly.

steve shadows · 04-15-2008, 10:39 AM

In boost yes

car will run like total shit out of boost unless your around 11.5

at least in almost every case I have seen

johngriff · 04-15-2008, 10:41 AM

I only live my life in boost.

Didn't you know that?

Yeah steve is right, in vacuum it needs to be even leaner.

I think your microtech install might be full of fail right now.

Blown240sx · 04-15-2008, 10:46 AM

Heres what I tune for

15.0 or 16.0 at idle

Low throttle I stay around 15.0 since there is no load

@ 0 boost 0 Vacuum I tune for 12.0

Under WOT 11.0-10.8

Then i just ramp the map so it flows between these transitions smoothly.

04-14-2008, 06:17 PM	#1
180ways2slide Leaky Injector Join Date: Apr 2007 Location: new york Age: 41 Posts: 125 Trader Rating: (0) Feedback Score: 0 reviews	how is his possible??? i never seen this b4. i am running a microtech ltx8s on my sr20det and trying to get the hang of this tunning thing, but how is it possible that the spark plugs foul out so easily. i am using ngk v power-9 and the car idles all day but if i manage to take it up the block it fouls the plugs on 1 pull. plugs are really black and dry not wet at all. has this happened to anyone where plugs fouled out within 2-3 days of purchasing them i kno i need a tune but after 2 days, 1 or 2 pulls up the block, plugs should of held up no matter how rich im running

04-14-2008, 07:02 PM	#2
Z U L8R Zilvia FREAK! Join Date: Jan 2007 Location: Georgia Age: 43 Posts: 1,194 Trader Rating: (0) Feedback Score: 0 reviews	might as well try known good coolant temp sensor (2 wire for ecu) off a 92 sentra sr20de. check your tps voltage with the throttle body closed 0-1 volt and wide open should be 4-5 volt. also verify correct base timing per fsm, it is 15 degrees advanced ( 15btdc) gl Dave __________________ RB25 280z GT30/76R 441hp/381tq 11.9@125

04-14-2008, 08:50 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	^^^ Yup, great advice. If they're not wet, then you're just running incredibly rich. Your base map could be good, I suppose, but somewhere you're dumping a ridiculous amount of fuel in. __________________ Jordan Innovations has a new web site! www.JordanInnovations.com -- All your favorite FD Pro Drifters love it, trust me -- www.JordanInnovations.com

04-14-2008, 08:59 PM	#5
johngriff Post Whore! Join Date: Jun 2004 Location: Long Beach, CA Posts: 4,103 Trader Rating: (4) Rides Gallery: johngriff Feedback Score: 4 reviews	Microtech... unnngggg do you have a wideband? What are your readings? Can you do injector phasing? That might be out of synch too. __________________ [email protected]

04-15-2008, 10:37 AM	#8
johngriff Post Whore! Join Date: Jun 2004 Location: Long Beach, CA Posts: 4,103 Trader Rating: (4) Rides Gallery: johngriff Feedback Score: 4 reviews	Well, your answer is that then. A car under 10.2 and richer is going to run really really bad. Your tune needs to be at LEAST 10.8/1 for the car to drive smoothly. __________________ [email protected]

04-14-2008, 08:54 PM	#4
gotta240 Post Whore! Join Date: Dec 2005 Location: so cal Posts: 3,496 Trader Rating: (21) Feedback Score: 21 reviews	What fuel managment are you running? edit. i fail at reading

04-15-2008, 05:55 AM	#6
180ways2slide Leaky Injector Join Date: Apr 2007 Location: new york Age: 41 Posts: 125 Trader Rating: (0) Feedback Score: 0 reviews	running the microtech ltx8s and 850cc injectors,255 walbro and the wideband reads --- until i tap the gas it goes to 15. so i runs evtremely rich under 10.1

04-15-2008, 08:28 AM	#7
Blown240sx Leaky Injector Join Date: Feb 2007 Location: Are you stalkin me? Age: 40 Posts: 107 Trader Rating: (0) Feedback Score: 0 reviews	Your A/F dont need to much lower than 11.0. Lean it out a bit and see how it does.

04-15-2008, 10:39 AM	#9
steve shadows Post Whore! Join Date: Aug 2003 Location: LA and OC Posts: 8,202 Trader Rating: (5) Feedback Score: 5 reviews	In boost yes car will run like total shit out of boost unless your around 11.5 at least in almost every case I have seen __________________ Like Me on FaceBook !

04-15-2008, 10:41 AM	#10
johngriff Post Whore! Join Date: Jun 2004 Location: Long Beach, CA Posts: 4,103 Trader Rating: (4) Rides Gallery: johngriff Feedback Score: 4 reviews	I only live my life in boost. Didn't you know that? Yeah steve is right, in vacuum it needs to be even leaner. I think your microtech install might be full of fail right now. __________________ [email protected]

04-15-2008, 10:46 AM	#11
Blown240sx Leaky Injector Join Date: Feb 2007 Location: Are you stalkin me? Age: 40 Posts: 107 Trader Rating: (0) Feedback Score: 0 reviews	Heres what I tune for 15.0 or 16.0 at idle Low throttle I stay around 15.0 since there is no load @ 0 boost 0 Vacuum I tune for 12.0 Under WOT 11.0-10.8 Then i just ramp the map so it flows between these transitions smoothly. __________________ I am the Negative Rep Master