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Colder plug = a rich tune?

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Old 09-22-2008, 07:20 PM
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Default Colder plug = a rich tune?

The car was running 12.8-13.1 AF on the TR-6's.. I switched to a colder plug and it was at 10.5 AF at the track.. So, I was like WTF? Does going to a colder plug affect the AF ratio?
Old 09-22-2008, 08:33 PM
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did you use the same fuel? this is n/a right?
Old 09-22-2008, 08:53 PM
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Yep.. Same fuel I always use. Which is 1/4 to 1/8th of left over 91 and then 1/4 of 100 octane to get a mix. Yea, its was just NA..
Old 09-22-2008, 09:07 PM
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Assuming the combustion process itself is unaltered, there should be no change in lambda.
Old 09-22-2008, 09:13 PM
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Could taking out the K&N air filter cause such a rich AF?
Old 09-22-2008, 09:20 PM
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Shouldn't, assuming you're still running a MAF, the increase in raw airflow should be easily accounted for. Sure nothing happend to the tune?
Old 09-22-2008, 09:31 PM
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It was all good... Only think I did was change the plugs to TR7's and loaded her up on the trailer and hit the track. 1st run NA was actually 10.2 - 10.5 AF... But, the odd thing was on the NANO 100 shot the AF was 11.8-12.4 AF.. WTF?
Old 09-24-2008, 11:03 AM
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Thats wierd. That plug should not make that huge of a difference. Taking the filter out will chenge things alittle. I wonnder if the two together just made that large of a difference. Put the filter back in see what it does..
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Old 09-24-2008, 12:17 PM
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I plan on it.. .Going back to the track in a few weeks with a little more suspension mods and to wrinkle the tune out.
Old 09-25-2008, 07:44 PM
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Just a possibility when you changed the plugs did you hit the ect sensor if it was cracked it could cause this.
Old 09-25-2008, 08:17 PM
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Dont think it was that, i had problames with that before and fixed it... Its all good to go now, heading back to the track to nail the AF down.. Just orded some new shocks and going to see if a DR will work better then my ET streets.

Old 09-25-2008, 09:26 PM
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Does the car intermintantly miss at idle with those plugs?
Old 09-25-2008, 10:03 PM
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Originally Posted by quik406
Does the car intermintantly miss at idle with those plugs?
Nope...
Old 09-27-2008, 08:08 AM
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The plugs can cause it to richen up a touch as the combustion temps will be lower, but not as much as you're seeing.

I'd stick with the bias ply tires, the radials might work, but there's no guarintee, the bias ply almost always work.

From that picture, I'd get a rear swaybar on the car, it's rolling over pretty bad
Old 09-27-2008, 09:47 AM
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The radials will work and be faster than the et streets or slicks. The car gets up on the tire much faster. but be carefull you have to run the front shocks a good 3 clicks tighter or you will end up on the bumper.
Old 09-27-2008, 10:23 AM
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I wish I had the same experiance as you guys, because last year off the transbrake I would absolutely blow the radials off right at the starting line, slicks would hook and go every time.
Old 09-27-2008, 11:30 AM
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Originally Posted by JL ws-6
I wish I had the same experiance as you guys, because last year off the transbrake I would absolutely blow the radials off right at the starting line, slicks would hook and go every time.
Goodyears dont work.... try M/T or Hoosiers and it will hook.

Those things are like trying to hook on Nitto's
Old 09-27-2008, 12:29 PM
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If you were on GY thats why. MT or hoosiers for the win. i normally say M/T for anything over 3300.
Old 09-27-2008, 12:30 PM
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Also you need different shock settings for the DR's go harder if they spin not softer in the rear. also tire pressure is important you can't run slick pressures. I ran mine at 20 psi
Old 09-27-2008, 05:58 PM
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Maybe when I get the car back out after my break for next year. I'm gonna minitub the car so if I can get at least the 295 in it I will try them again. If the 315's will fit, I'll just start with them, see what that gets me.



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