Nitrous noob....what caused this?
09-29-2008, 11:52 PM
#21
LS1 Stock and AFR heads.....
Thread – 14mm
Reach - .708”
Socket – 5/8 hex
Seat - Taper
Stock Heat Range: 5
Gap: .060
Plug: NGK TR55 (stock number 3951); NGK TR55IX (stock number 7164); Autolite 764; Denso IT-16 (stock number 5325)
Nitrous (one step colder)
Heat Range: 6
Gap: .035 - .038
Plug: NGK TR6 (stock number 4177); NGK TR6IX (stock number 3689); Autolite 103; Denso IT-20 (stock number 5326)
Nitrous (two steps colder)
Heat Range: 7
Gap: Consult
Plug: NGK BR7EF (stock number 3346); NGK TR7IX (stock number 3690); Autolite AR94; Denso IT22 (stock number 5327)
Nitrous (two and a half steps colder)
Heat Range: 8
Gap: Consult
Plug: NGK R5724-8 (stock number 7317); NGK TR8IX (part number 3691); Denso IT-24 (stock number 5328)
Nitrous (three steps colder)
Heat Range: 9
Gap: Consult
Plug: NGK R5724-9 (stock number 7891); Autolite AR93; Denso IT-27
Nitrous (four steps colder)
Heat Range: 10
Gap: Consult
Plug: NGK R5724-10 (stock number 7993); Autolite AR92
If you want something that drives around better try the Denso Iridium IT-24's
They are not cheap though.
09-30-2008, 01:03 AM
#24
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That is not good. I have mine at 24 running 150 dry shot. Works like a charm.
Tr6'ers, gapped at .34
I think you need that hit tuned in better, especially when you are wide open.
Or you were hitting it when you were not in wide open, and wiped those plugs out.
Tr6'ers, gapped at .34
I think you need that hit tuned in better, especially when you are wide open.
Or you were hitting it when you were not in wide open, and wiped those plugs out.
09-30-2008, 06:06 AM
#25
I have to run TR7's on the motor or it will specle the plugs so your set wouldnt work for me N/A much less 150 shot.
The more power you make the colder the plug you should run (generally) Fuel and timing play a part in that also.
09-30-2008, 06:22 AM
#26
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Im running a 255 intank, and 94 octane pump gas. Im not sure how to describe the tune, my wideband was reading 12.0 all the way up the rpm range when I sprayed it. What plugs are people running? I thought the tr6 was the coldest you wanted to go? Could I just put a bigger fuel jet in and better gas to remedy this problem, or would the timing still eat those plugs up?
Thanks for the help.
Thanks for the help.
09-30-2008, 07:56 AM
#27
Why would a TR6 be the coldest you want to run? Stop listening to dumb people who say/post stuff like that.
Going up a jet size wont do a whole lot, better fuel will help.
If you cant pull timing yourself and you dont want to pay a tuner to do it I would run better fuel and a colder plug but what do I know.
Going up a jet size wont do a whole lot, better fuel will help.
If you cant pull timing yourself and you dont want to pay a tuner to do it I would run better fuel and a colder plug but what do I know.
09-30-2008, 08:57 AM
#28
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Why would a TR6 be the coldest you want to run? Stop listening to dumb people who say/post stuff like that.
Going up a jet size wont do a whole lot, better fuel will help.
If you cant pull timing yourself and you dont want to pay a tuner to do it I would run better fuel and a colder plug but what do I know.
Going up a jet size wont do a whole lot, better fuel will help.
If you cant pull timing yourself and you dont want to pay a tuner to do it I would run better fuel and a colder plug but what do I know.
09-30-2008, 09:03 AM
#30
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These are a fresh pair of tr6's, I pulled them out of cylinders 5,7 and 6,8, is this detonation? If so what causes it, lack of fuel, too much timing, plugs not gapped properly? I'm running a 150 shot, jets .062 N and .033 F btw.
These are a fresh pair of tr6's, I pulled them out of cylinders 5,7 and 6,8, is this detonation? If so what causes it, lack of fuel, too much timing, plugs not gapped properly? I'm running a 150 shot, jets .062 N and .033 F btw.
09-30-2008, 10:07 AM
#31
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One more question.....why wouldn't all 8 plugs look like that, those were from cylinders 5,7 and 6,8. The last two clyinders on each bank. Is it typical for those cylinders to not get as much fuel as the first couple?
09-30-2008, 11:23 AM
#32
They get more air not less fuel, so it makes them leaner.
The only thing you can do about it with a stock computer is get a set of loaded injectors (For example 5 & 6 would be 5% more and 7 & 8 would be 10% more).
Any Nitrous kit that feeds from the front will only make it worse.
If you had a direct port you could fatten up those holes with a bigger fuel jet or by putting a smaller nitrous jet in them.
09-30-2008, 11:57 AM
#34
i'll throw my .02 in here...
First off, I dont think you are pulling enough timing. I believe a .062 nitrous jet is roughly a 175 shot... I don't know how you are injecting your nitrous though.. that usually plays a role.
any hoo... if you have 24* of timing and you are spraying either a 150 or 175, that's a lot. The rule of thumb is 1-2* every 25hp. which means n/a you have somewhere between 30-38* of timing..... that's detonation hitting territory there, unless maybe you are on race gas.
for poops and giggles, did you check your duty cycle on your injectors while you got your tune? just because you have a walbro fuel pump doesnt mean your engine could be starving for fuel.
First off, I dont think you are pulling enough timing. I believe a .062 nitrous jet is roughly a 175 shot... I don't know how you are injecting your nitrous though.. that usually plays a role.
any hoo... if you have 24* of timing and you are spraying either a 150 or 175, that's a lot. The rule of thumb is 1-2* every 25hp. which means n/a you have somewhere between 30-38* of timing..... that's detonation hitting territory there, unless maybe you are on race gas.
for poops and giggles, did you check your duty cycle on your injectors while you got your tune? just because you have a walbro fuel pump doesnt mean your engine could be starving for fuel.
09-30-2008, 12:58 PM
#35
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Blake you could have called me.... thats what you get for listening to Dustin and a bunch of Mustang guys trying to work on LS1's.
FWIW I had good luck running the 200 shot with BR7EF and 19 deg. timing. That was on 11.5:1 and me tuning it. Plugs came out looking perfect. That was also on 100% 93 octane
FWIW I had good luck running the 200 shot with BR7EF and 19 deg. timing. That was on 11.5:1 and me tuning it. Plugs came out looking perfect. That was also on 100% 93 octane
09-30-2008, 01:38 PM
#38
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im with atvracer....pull a couple degrees and stick a colder p;ug in it...a 6 range is ok on a stock longblock or a mild cammed car...your running an ms4 that has alot of overlap....if you think the colder plug will make you lose power n/a you are wrong....
09-30-2008, 02:15 PM
#39
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if you think the colder plug will make you lose power n/a you are wrong....
your running an ms4 that has alot of overlap
