new to carbed ls
07-25-2011, 11:18 PM
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new to carbed ls Built 347, stock crank, eagle rods, manley pistons, trick flow 215 heads, victor intake, tr9 plugs, Gary Williams 750 carb motor should be around 11.1. What kind of timing would you guy think we should be on? The motor is in a s10 and had ported 241's and was probably around 10.1 with a pro form 750 carb tr7 plugs and the guy had 36 degrees of timing in it and was pulling 4 out on a 150 pill an it ran 6.0 5.90 all day now with better heads and better carb the best its been has been 6.20 60' fell off a tenth as well. Was told to go to the 9 plugs also. Timing seems awfully high to me plugs a just a tad on the rich side right now I believe the carb has 73 jets up front and maybe 85 in the back can't remember exactly. Truck ran 7.50 on motor with old set up now runs 7.30 bit has slowed down on the kit I figured it woulda at least picked up 2 tenths on the kit not slow down???? I'm dumb founded and like I said new to the carb thing Im just thinking we are headed in the wrong direction. Any help would be greatly appreciated. And if Im going completely in the wrong direction please excuse my ignorance!!!
07-26-2011, 10:22 AM
#4
Check your fuel pressure while on the nitrous as well. Esp if you have a seperate fuel system for the nitrous. Check bottle pressure too. Heater, if you have one, may not be working etc.
07-26-2011, 10:52 AM
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Well best I can tell traction isn't an issue an yes we are running a stand alone and fuel pressure jets everything are the same. Also forgot to mention cam is around 598 598 230's on duration an 114 I believe. And bottle is always around 950 or a lil higher. I'm just kinda gettin disgusted spent more money to go faster and now we're going slower. My next move was gonna be go back to the tr7 plugs and hopefully get some more timing out of the motor.
07-26-2011, 01:41 PM
#7
speedtigger, you sir , are a wise man. although i still think traction could be the problem. did the 60ft get slower with AND without the nitrous? its just nearly impossible to detect tire slippage on a car or truck thats that quick. i saw an article a few years ago in car craft where a 10.5 car was setup with a computer on the tach that monitored the rpm as he made a pass. they found that the car was slipping the tires at each gear shift and off the line. they adjusted the 4 link till they no longer had the rpm spikes and picked up something like 2-3 tenths. they had no idea the car was spinning till they set up the monitor . by the way did the mph go up with the new setup?
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07-26-2011, 03:37 PM
#9
DISCLAIMER: I"m not a nitrous expert at all. Just relaying my personal experiences.
How big of a N2O hit are we talking about here? A TR9 seems like a pretty cold plug to me and they may have a hard time firing under extreme cylinder pressures (during nitrous use). Just to give you an example, I run TR6's in my 11:1 346 LS1 and spray 175-200 with no detonation issues at all. Would I be safer with a TR7?....probably. But a TR9 just seems way too cold to me. I personally would go back to the TR7s and slowly work your way back up through your nitrous jetting until you get back to where you want to be. Just keep an eye on the plugs after each hit and they'll tell you whats going on.
How big of a N2O hit are we talking about here? A TR9 seems like a pretty cold plug to me and they may have a hard time firing under extreme cylinder pressures (during nitrous use). Just to give you an example, I run TR6's in my 11:1 346 LS1 and spray 175-200 with no detonation issues at all. Would I be safer with a TR7?....probably. But a TR9 just seems way too cold to me. I personally would go back to the TR7s and slowly work your way back up through your nitrous jetting until you get back to where you want to be. Just keep an eye on the plugs after each hit and they'll tell you whats going on.
07-27-2011, 09:56 AM
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It's just 150 shot and I guess it could be hazing the tires got some new hoosier d/r's on the way so guess we'll see if it picks up or slows down. I'm still just thrown off by that much timing but Idk that's I why I asked you guys!
07-27-2011, 10:40 PM
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07-28-2011, 10:27 AM
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Put tr-7's back in. drop the plug gap to .022. More compression equals more cylinder pressure and resistance to fire the plug. Try that out and see where that takes you.
