Spark plug gap
Currently have 031 gap seem to be getting what seems like spark blowout upper rpms d1 blower 16lbs boost should I run a smaller gap? Was thinking 028?
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Re: Spark plug gap
It wouldn't hurt to close the gap a bit. I run .028 on NGK BKR7Es at 29 pounds of boost and I haven't experienced any spark blowout issues.
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Re: Spark plug gap
if the gap change does not work, look at the wires right at the COPs, I was having a similar issue in the upper RPM range and no matter what I did , swap COPs or plugs still had it. Then I noticed the wires were very tightly twisted at the COP, I untwisted by it by a few turns and it fixed it completely. I guess at some point during the build/plug changes, etc two of the COPs were getting rotated. Had this problem on both rear locations.
May not help, but it was the final item that fixed my problem after struggling to find anything. Still seems hard to believe. -dw |
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Re: Spark plug gap
I think mine are gapped around .028 with 15psi
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Re: Spark plug gap
Thanks for the info! I’ll regap and check the cops.
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You shouldn't be having blow out at that boost level and gap. How old are the COPs? Are you sure you're not having belt slip. I thought I was having spark blow out and after chasing everything ignition related I found it was a belt issue.
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Re: Spark plug gap
16lbs of boos build bottom end. Could be running rich? I have 80lb injectors that I'm going to change out to 60's and I do see puff of black smoke when I get on it on gear changes so I guess it could be a rich condition. cops are less than a year old bought oem ones. I want to get the car retuned with the 60's but want to make sure I don't have any other issues. I think Ill regap plugs and check twist in cops(easy enough to do) at least I'll know thats not the issue. Belt is new changed it within last 2 weeks(gates green belt).
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Re: Spark plug gap
Changing to 60lb injectors will not help at all if the current 80lb are tuned properly.
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Re: Spark plug gap
I've looked into that and people go back and forth on this 80lbers dump too much fuel at idle and low rpm so hardware issue can't be tuned out. Have had 3 different competent tuners on different changes 11mpg just too low. I guess I'll find out the hard way and let you guys know.
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Re: Spark plug gap
I believe the stock spark plug gap is .052 to .056 in. Just changed my plugs recently and this is what was recommended by All Data
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Although MPGs was never a concern for me at 750+hp, there are so many other factors that impact MPG, not just the injectors. I think the best I have done is 13; but that is using a TH400 trans, 3500 stall and driving around town on 315 drag radials...oh on E85. Given that, 13 is fantastic. :) My normal is 10-11 but my normal driving the mach involves a heavy right foot so it is not a fair comparison. Its about Smiles per Mile! |
Re: Spark plug gap
I should also note, injector sizes should be selected based on your power goals and setup. If you are not running E85 and only what 550 HP, then 80s may be to much for you. E85 will require about 30% more fuel FWIW.
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Re: Spark plug gap
The tune itself is fine car runs great just dumps too much fuel at idle. Tuning can't fix hardware, the 80s don't like to run below 2ms pulsewidth, and you end up running slightly less PW than that at idle with a little 4.6, with a 5.4 you have to do all the tricks to get load up at idle and get the PW up above 2. When you are below 2ms the injectors just dump fuel and you run 11:1.
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I am running 11:1 compression, stroker (5.0) and aggressive cams for my turbo setup and ported heads. While all this may make you say my setup allows it, I also have a buddy that has the same injectors on a 2 valve with 8.5 compression with the same 76mm turbo. He does have cams and head work as well. But, at idle, he has the same results. The only two things that are the same between our builds are: turbo, injectors and the tuner himself. do what you want, I just 100% completely disagree with you, 80s work fine at idle. |
Re: Spark plug gap
JV7, I personally would call Manny at HPP Racing and let him try to fix your problem. Even today, he tuned a 5.0 Coyote N/A with 80s, and it turned out great. 80s are fantastic injectors that so many discount because they are not properly adjusted, if your tuner says it cannot be done, then find a better tuner, even if it is not HPP. I hate it when people waste money because of bad advice.
Feel free to throw my advice in the trash, just trying to help. |
Re: Spark plug gap
Ok thanks for your input Ill definitely call Manny see what he says thats what we're here for its for advise I would never toss advise in the trash if I'll keep this updated again thanks for the help.
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