im already running autolite 103.s in my car .does anyone know of an autolite plug part # that is one range colder. my car was poping on the hose ,and i switched to 103s and it helped alot but still does it slightly. comp. ratio is around 11.5 and yes im running racing gas.thanks for any info.

 

Go with NGKTR64177's
trust me

 

i dont know of any place around here that carries ngk brand plugs. i didnt want to have to mail order them so thats why i wanted an autolite brand. anyone???????

 

i think they are Autolite 104...but i am not sure...i wouldlike to know also...
Thanks

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Bolt-On 95 Z28 A4
See the Z
LT1Tech.com

 

A 103 is pretty cool!
Sounds like you are actually a little rich.What's you bottle pressure at the time?
Some race gas also doens't have a very good specific gravity to be used with nitrous (like VP Red for instance).
How much are you spraying?
I'd just go with the TR6's stocking number 4177 and gap them at .032 to start. Go a little tighter if you still have problems.
Autolites are junk as far as I'm concerned. Might as well put in some Motorcrap plugs.
I'm sure you have a NAPA somewhere close. They sell them and can order them if not in stock.

Good luck
Dave Brown

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If a little's good,
More is better,
And too much is just right!!!

 

bottle psi. is around 1000 and i tried two different bottles the other was less. im only spraying 125 for now.but plan on increasing it. i didnt have this problem before the rebiuld but im running close to 11.5 cmp. with a 383 now. their may be a napa store somewhere around here but i dont know of one. the 103s really helped a bunch compared to stock.

 

You want your bottle pressure at 950psi with a NX kit.
Don't know what kit you have.
Purge the pressure down before the run.
As for the auotlites.
I tried them once and the car wouldn't even start. I've had two other friends have the same problem and have heard of at least three other racers around here that haven't had luck with the either.
I had them all try NGK and they love them and will never go back, just like me.
I think the 103's though are too cold for just a 125 shot. You only want to go down one heat range for a small shot like that.
They might not be lighting the mixture on the top-end. That's what I'm getting at.
Really if you are going to spray more than say 200 horse I'd go with the R series plugs, from NGK.
Call them and ask for John (248)926-6900 Tell him you need a -7 R series plug for your motor, to replace your TR5's. If he's not there someone should be able to help you. Make sure you get the stocking number, that's what NAPA will need.
You also didn't mention your gap size.

Good luck,
Dave Brown

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If a little's good,
More is better,
And too much is just right!!!

 

found a napa store and called them in this area. they never heard of the tr64177 but they did show a 4177. i also found out that advanced autoparts sales ngk's but it was the same thing. didnt show a tr6 or tr64177 but showed a 4177. is this the same plug??? neither place had them in stock and would have to order them.

 

ok,just read back over the posts and noticed the stock number is 4177 so thanks guys. but will have to order some.