backfire and bb's on tin roof

jimdrechsler · 05-09-2005, 02:44 PM

timing is around 14-16 degrees. i changed it to 12. anyone give a quick recap how to do this again? this is what i did- i took off spout connector and then started car with thing around the wire closest to bumper on left side facing car (number 1), and then shoot with gun? when i adjusted it, i turned car off then put the spout back in and tightened bolt. is this right? thanks,

also, what should mny timing be at? it seems sluggish until it hits about 3 1/2 grand in each gear. i also run 75 shot of nitrous at times.

thanks

KiltedBanshees93GT · 05-10-2005, 08:38 AM

#1: DONT RUN THE N2O UNTIL YOU GET THIS CORRECTED. Just friendly advice

#2: I would say take the timing back to 10 degrees(stock), and see if its still happening. I would also re-check the timing after you tighten the bolt to make sure it doesent "wander" while tightening. (You can also try a higher grade with the timing at stock, and see if it make a difference)
What do the plugs look like? Lots of ash, or oil fouling?
Some other q's would be, when did this start/did it come on gradually? Last general tuneup?

05-10-2005, 12:17 PM

Please tell me that you retard your timing when you use the nitrous?! 12 or 13 degrees btdc is fine, but if it's still pinging you need to back it off until there is no detonation. You should retard the timing down to 8 or 9 degrees btdc when using the nitrous. But check your plugs too, like KiltedBanshee said.

05-10-2005, 12:17 PM	#3
Simi Stang Guest Posts: n/a	Re: backfire and bb's on tin roof Please tell me that you retard your timing when you use the nitrous?! 12 or 13 degrees btdc is fine, but if it's still pinging you need to back it off until there is no detonation. You should retard the timing down to 8 or 9 degrees btdc when using the nitrous. But check your plugs too, like KiltedBanshee said. Last edited by Simi Stang; 05-11-2005 at 12:23 PM..

05-09-2005, 02:44 PM	#1
jimdrechsler Registered Member Join Date: Apr 2001 Posts: 167	Re: backfire and bb's on tin roof timing is around 14-16 degrees. i changed it to 12. anyone give a quick recap how to do this again? this is what i did- i took off spout connector and then started car with thing around the wire closest to bumper on left side facing car (number 1), and then shoot with gun? when i adjusted it, i turned car off then put the spout back in and tightened bolt. is this right? thanks, also, what should mny timing be at? it seems sluggish until it hits about 3 1/2 grand in each gear. i also run 75 shot of nitrous at times. thanks __________________ OLD CAR-89 lx convt- Flowtech II headers, H-pipe, 2 1/2 "flowmasters- pulleys- 3.73's, ripper shifter- ram air- Best 1/4 mile time- a measley 14.2 at 98.6 PRESENT CAR- 90 LX BBK long tubes, h-pipe with cats, flowmasters. 3.55's holley systemax II kit- 70 mm TB 30#injectors, jacobs ignition, black magic fan, 180 thermostat, 75 shot of NOS- NITTO DR'S STREET TIRE BEST RUNS 1/4 mile13.2 @112 w/ NOS 2.17 60' 13.5 @103 2.1 60' new time with Dr's 12.8 at 111 w/ 75 shot Last edited by jimdrechsler; 05-09-2005 at 03:51 PM..*

05-10-2005, 08:38 AM	#2
KiltedBanshees93GT Registered Member Join Date: Jun 2000 Location: Pigeon Forge Tn Posts: 611	Re: backfire and bb's on tin roof #1: DONT RUN THE N2O UNTIL YOU GET THIS CORRECTED. Just friendly advice #2: I would say take the timing back to 10 degrees(stock), and see if its still happening. I would also re-check the timing after you tighten the bolt to make sure it doesent "wander" while tightening. (You can also try a higher grade with the timing at stock, and see if it make a difference) What do the plugs look like? Lots of ash, or oil fouling? Some other q's would be, when did this start/did it come on gradually? Last general tuneup? __________________ ____________ '66 Mustang Coupe- AKA "Lenore" on disability for a (long) bit '93 GT Mostly stock AKA "Fawkes" Rice Haters Club Member #239 "I find your lack of faith...disturbing." "Every normal man must be tempted at times to spit on his hands, hoist the black flag, and begin to slit throats." H. L. Mencken