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Spark plug & gap for fi ????
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Joined: Jan 2007
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From: Pittsburgh,Pa
Spark plug & gap for fi ???? Hey guys ,Im getting ready to take my ride up to Gettysburgh,Pa this weekend for a tune on my 02 35th APS and currently am running the NGK R TR6 V power plug and was wondering whats the best gap to set these at before i receive my tune??and is this a good FI plug?
Staging Lane
Joined: May 2009
Posts: 54
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anywere between 28-32 is good... got my at 28.... 750 rwhp
I think that plug selection should be made based on the power you expect. I wouldn't run a TR6 on anything over 400 RWHP just for safety's sake. I would run a NGK 7317 (#8) gapped at 28-30
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I wouldn't run a projected tip plug in a high hp forced induction application. I am running NGK-4091 which is heat range 7 and is a non-projected spark plug gapped at .029.
9 Second Club
Joined: Feb 2002
Posts: 985
Likes: 7
From: Lake Orion, MI
It's all about tuning for your combo and street/strip cars have a lot more room than race cars do when it comes to selecting plugs.
TR6s gapped at 28 running with 18 degrees of timing at 19-20psi on pump gas and meth can get you hot lapped 9.4s at 149mph in some cases.
Yes an A2W intercooler helps keep those IATs down where everthing is comfortable. In others, TR6s can be a D'ohhhhh!!! but 400rwhp sure isn't the limit to them unless you've really messed something up in a LSx combo. 
Simply dropping in colder plugs isn't always the answer. You're trading the colder plug which makes less power, all other things being equal, in the hopes that you can throw more timing or boost at it to net more power on a given fuel combination. You need to get out and tune the car to find what the sweet spot is for your combo and your power goals.
Rick
TR6s gapped at 28 running with 18 degrees of timing at 19-20psi on pump gas and meth can get you hot lapped 9.4s at 149mph in some cases.
Yes an A2W intercooler helps keep those IATs down where everthing is comfortable. In others, TR6s can be a D'ohhhhh!!! but 400rwhp sure isn't the limit to them unless you've really messed something up in a LSx combo. Simply dropping in colder plugs isn't always the answer. You're trading the colder plug which makes less power, all other things being equal, in the hopes that you can throw more timing or boost at it to net more power on a given fuel combination. You need to get out and tune the car to find what the sweet spot is for your combo and your power goals.
Rick
I am running the TR6's here as well. 538rwhp with mine on 7-7.5psi. And I DD it. No problems with the plugs in my application.
Last edited by Hugger Z; Jun 12, 2009 at 11:58 AM.
It's all about tuning for your combo and street/strip cars have a lot more room than race cars do when it comes to selecting plugs.
TR6s gapped at 28 running with 18 degrees of timing at 19-20psi on pump gas and meth can get you hot lapped 9.4s at 149mph in some cases. Yes an A2W intercooler helps keep those IATs down where everthing is comfortable. In others, TR6s can be a D'ohhhhh!!! but 400rwhp sure isn't the limit to them unless you've really messed something up in a LSx combo.
Simply dropping in colder plugs isn't always the answer. You're trading the colder plug which makes less power, all other things being equal, in the hopes that you can throw more timing or boost at it to net more power on a given fuel combination. You need to get out and tune the car to find what the sweet spot is for your combo and your power goals.
Rick
TR6s gapped at 28 running with 18 degrees of timing at 19-20psi on pump gas and meth can get you hot lapped 9.4s at 149mph in some cases.
Yes an A2W intercooler helps keep those IATs down where everthing is comfortable. In others, TR6s can be a D'ohhhhh!!! but 400rwhp sure isn't the limit to them unless you've really messed something up in a LSx combo. Simply dropping in colder plugs isn't always the answer. You're trading the colder plug which makes less power, all other things being equal, in the hopes that you can throw more timing or boost at it to net more power on a given fuel combination. You need to get out and tune the car to find what the sweet spot is for your combo and your power goals.
Rick
it but first hand is always better. 
I have made around 1000 rwhp is 3-4 cars, and 500-800 on a handful with tr6's at 30. I know that people reccomend using a much colder plug for that power level but I tried switching and didnt have much luck.
