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Re: Question John...& my mods Posted by John Williams [Email]  (#1982) [Profile/Gallery]
(more from John Williams) on Tue, 10 Jul 2007 08:37:33
In Reply to: Question John...& my mods, JEB in ATL, Mon, 9 Jul 2007 19:13:52 Members do not see ads below this line. - Help Keep This Site Online - Signup |
I used to have a stage 3 with Jak's big t28 and I now have a stage 6 with gt3071 and its putting down around 340whp and 400wtrq. I also have a 9k aero with tdo4 6cm2 with Jak's stage 3 ecu. Makes around 24psi of boost.
Like I stated to Seth, when you up the boost and start tuning it can and usually does bring out some of the weak points in your system. I have had many issues with misfires under heavy boost, but almost all of my problems were fixed by running new ngkbcpr7es-11 plugs gapped to about .032
At one point with Jak's big t28 I was spiking to 28-29psi of boost and it would cause misfire unless I gapped the plugs down to .030 and when I had my gt3071 screaming at 33psi off boost I had to go down to .028mm. The more boost you run it seems like the tighter you have to gap the plugs down, at least that is what I have found on my cars.
I also had a di go bad and it would do ok until under heavy boost, then it would mis-fire, I finally tried another known good di and that took care of my issues. I also had luck one time by replacing just the lower section of my di, the black boot section, this had arching and was causing mis-fires. Replaced the lower section, mis-fire's gone.
So, I would first buy a new set or two of ngkbcpr7es-11 plugs and change them every so often. My aero at stage 3 seems to last around 3-4 months or so, but as soon as I feel it start to mis-fire under boost, I change them out. Make sure you gap them to at least .035mm and then lower to .032mm to see if that helps. After that I would go to checking my di... Good Luck,
John
posted by 65.114.20...
, Wed, 18 Jul 2007 21:52:34
, Thu, 19 Jul 2007 08:30:25, Sat, 21 Jul 2007 15:00:08, Sat, 21 Jul 2007 20:54:03, Mon, 9 Jul 2007 15:17:20, Tue, 10 Jul 2007 08:27:16, Tue, 10 Jul 2007 09:26:53, Tue, 10 Jul 2007 11:52:58, Tue, 10 Jul 2007 13:25:12, Tue, 10 Jul 2007 13:57:25, Tue, 10 Jul 2007 14:46:16, Tue, 10 Jul 2007 13:55:44, Tue, 10 Jul 2007 12:57:21, Tue, 10 Jul 2007 13:48:52, Tue, 10 Jul 2007 14:10:01, Wed, 11 Jul 2007 08:52:29, Thu, 19 Jul 2007 08:40:52, Wed, 18 Jul 2007 08:32:36, Wed, 18 Jul 2007 15:48:07, Wed, 18 Jul 2007 14:33:02, Wed, 18 Jul 2007 17:15:06, Wed, 18 Jul 2007 08:39:31, Wed, 18 Jul 2007 15:39:49, Wed, 18 Jul 2007 16:15:29, Wed, 18 Jul 2007 16:18:51, Mon, 9 Jul 2007 10:24:45, Tue, 10 Jul 2007 08:37:33 <-- Viewing This Message, Tue, 10 Jul 2007 08:55:24, Tue, 10 Jul 2007 13:39:41, Wed, 11 Jul 2007 19:38:32, Wed, 11 Jul 2007 20:19:00, Wed, 11 Jul 2007 20:18:39, Thu, 12 Jul 2007 09:30:17
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