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Old 06-06-2019, 10:38 AM   #1
 
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Default Popping under heavy throttle

Hello,

I don't have a build thread so I'm going to update you now. My '02 turbo Camaro ended up getting an AEM 320LPH pump, 80# injectors, and E85. Thank you for convincing me to go big!

I tried having the car tuned by a guy who started making mail tunes his side gig. When I finally got the ECM back the car wouldn't run worth a crap and his responses were coming in as long as three days later. I gave up and called John at Intense.

Now the car runs much better. Granted, it's just a safe tune to get me by until I can get it dynod. However, I can't seem to get into boost like at all. I'm running Autolite 104s gapped at .045" and I plan to take it down to .04" to see if that makes a difference. Any other suggestions?

I have an Aeroforce scan gauge and Torque Pro, but I don't really know how to use them to their fullest potential. All I can see is that I have 0 KR which is great. Is there anything else I should look at?
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Old 06-06-2019, 10:40 AM   #2
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how much boost?

that gap sounds huge for a turber car
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Old 06-06-2019, 10:44 AM   #3
 
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It doesn't even need to get to 0 vacuum before it starts doing it. Right now, I have the 2psi spring in in, but I'm going to put a heavier one in it tonight, because I can hear the gate opening even at idle. lol

Good to know though. Do you think I would be safe going down to .035"? What are the side effects of having too tight of a gap? Thanks
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Old 06-06-2019, 10:45 AM   #4
 
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Tighten that gap. I had to go pretty tight (.030 rings a bell) on mine for ~15ish pounds. Otherwise it would stutter (mis under high load high boost).
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Old 06-06-2019, 10:53 AM   #5
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yeah mine was under .030 otherwise id get blowout



worth a shot to tighten it up
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Old 06-06-2019, 12:04 PM   #6
 
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I, had to go down to .022 but that was on 24psi
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Old 06-06-2019, 12:06 PM   #7
 
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I run my coyote at .0265, there isn’t much down side to a tight gap especially if you need it to run right on the top end
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Old 06-06-2019, 12:14 PM   #8
 
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Thanks guys. I will report back with results tonight.
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Old 06-06-2019, 12:41 PM   #9
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I run my coyote at .0265, there isnít much down side to a tight gap especially if you need it to run right on the top end
i think the only thing i could think that got "different" when i dropped smaller was it would occasionally misfire at idle?

while ago.
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Old 06-06-2019, 01:15 PM   #10
 
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i think the only thing i could think that got "different" when i dropped smaller was it would occasionally misfire at idle?

while ago.
It can misfire at idle with a really tight gap Iíve never really noticed it doing that on any car, the Grand Prix did have a fairly choppy cam so it was probably hard to tell
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Old 06-06-2019, 01:16 PM   #11
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It can misfire at idle with a really tight gap Iíve never really noticed it doing that on any car, the Grand Prix did have a fairly choppy cam so it was probably hard to tell
mines stock so that's possibly why i noticed.
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Old 06-06-2019, 02:16 PM   #12
 
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mines stock so that's possibly why i noticed.
My mustang starts to idle crappy after a season on the same plugs, I swap them out every spring to keep it happy
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Old 06-06-2019, 06:03 PM   #13
 
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Default My tuning experiences lately

I'll share my experiences lately.
Several local guys have picked up larger cubic engine BBC. Anything from 496 up to one guys 785 cu in and all of them from one builder and his" cnc" aluminum heads.
Well he sends Autolite plugs and claims "warranty" only if they are used.
And so far I have seen about 40 sets of Autolite plugs that are pure junk. The ONLY way to get any of them of them to work is to take new ones, gap them carefully, then bake them at 400 degrees for about two hours.
Not sure what happens but then we only get about 2 of 8 in a set being useable.
As for ability to make power I still find more and better results with AC Delco, NGK and Denso.
My preference if not using ACs I use NGK.
Also reducing gap from 060 to 050 gains decent power on NA 3800. Then remove .001"-.003" for every lb of boost
We added a pair of 101mm turbos to one 565 and ran it down to .022" .
But that engine eventually got a prototype ignition.
But I'll tell you I've been seeing a LOT of bad Autolite plugs lately. Either failing after bit of running OR dead out of box.
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Old 06-06-2019, 06:12 PM   #14
 
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Sorry for the poor focus...

[IMG]<blockquote class="imgur-embed-pub" lang="en" data-id="a/llhIDpa"><a href="//imgur.com/llhIDpa"></a></blockquote><script async src="//s.imgur.com/min/embed.js" charset="utf-8"></script>[/IMG]

All six looked pretty good.

I put the 8 psi spring in the waste gate and gapped all the plugs to .035" She scoots now! She idles just fine too. Since I noticed some smaller break-ups in certain situations, I might close them up a couple thou later. I don't plan to run boost much higher than I just did for quite a while, so I don't need to go crazy.

Damn, I'm excited! Thanks for the help everyone!
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Old 06-06-2019, 06:14 PM   #15
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Drop that plug gap down to .023-.025 and use some Br7’s. That will drive fine. People over think tightening the gap but the reality is you’d probably be fine even tighter than that. I’ve seen guys go as low as .017 without issue on part throttle driving.
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Old 06-06-2019, 06:15 PM   #16
 
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BR7s? What's that? Thanks for the tip.
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Old 06-06-2019, 06:17 PM   #17
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BR-7EF thread on SVTPerformance. There are several different types of BR-7s so I'm not sure which ones willizm is talking about?

https://www.svtperformance.com/threa...-plugs.927495

https://duckduckgo.com/?q=br-7+plugs...124-3a_&ia=web
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Old 06-06-2019, 06:55 PM   #18
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Sorry, BR7EF plugs. They are like $2/plug and I’d run them on e85 up to 20-22psi without a problem gapped to .022
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Old 06-07-2019, 06:18 AM   #19
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Originally Posted by v6buicks View Post
Sorry for the poor focus...

[IMG]<blockquote class="imgur-embed-pub" lang="en" data-id="a/llhIDpa"><a href="//imgur.com/llhIDpa"></a></blockquote><script async src="//s.imgur.com/min/embed.js" charset="utf-8"></script>[/IMG]

All six looked pretty good.

I put the 8 psi spring in the waste gate and gapped all the plugs to .035" She scoots now! She idles just fine too. Since I noticed some smaller break-ups in certain situations, I might close them up a couple thou later. I don't plan to run boost much higher than I just did for quite a while, so I don't need to go crazy.

Damn, I'm excited! Thanks for the help everyone!



that's awesome, im glad.
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