clendaniel

I've been lazy this past week or I would've posted this earlier. A bunch of us from the AEM EMS forum flew in a couple tuners Labor Day weekend to do some tweaking. After alot of setbacks and problems (I won't get into it all but we had lightening strike near the first dyno and fry it, had the police called on us, and had breakdowns hindering the progress) we got all the cars tuned and were relatively successful. The group was comprised of a half-dozen supras (most w/ >=T78 singles!), an rx7, s2k, ITR, and my Prelude. Since this is preludeonline we'll only deal with my Prelude.

I had Justin from ProTech Performance do most of the tuning...I was pretty confident with my driveability and fuel maps but wanted a professional eye when it came to the timing. As I had suspected I was uber-conservative on the timing side and needed quite a bit of advance. Given that we were tight for time (tuned 8 cars in 6 hours at the second dyno) and some suspect Sunoco 94 we only got to tune it at 12psi.

After getting things dialed in and feeling good on the street we strapped it on the dyno which revealed an interesting issue. It seems that I'm having some spark issues under boost...we tweaked it some but couldn't solve the issue. As soon as the turbo spooled there was a noticeable misfire as evident in the dyno graph. Ended up making 302hp/262lbft at 12psi. It's a little shy of where I wanted it at that boost but Justin seemed to think that if we cure the misfire it'll pick up another 25-30 hp.

Here's the graph:


Anyone have a similar ignition issue? This is a msd 6al/blaster ss feeding ngk zfr7f-11's which are now gapped down to .028 (tried from .035 down).

--Ian

 

TrboH22

I've gone through 2 MSD ignitions now...I have a 3rd sitting in my garage for when this one craps out. I'm gonna switch to crane. I haven't had good luck, but it could be your problem although not really likely.

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clendaniel

Yeah, I had a 6BTM go bad on me when I was running all the piggyback BS. I don't think it's the ignition...the MSD's seem to just die, this works (or doesn't work!) in a very reliable and repeatable fashion. I'm thinking it might be related to my Nology wires...been hearing alot of crap about them recently and they are close to 2yrs old now. I've got some MSD 8.5mm's on the way to test the theory.

--Ian

SooCo100pf

I have had a MSD unit for two years with no probs yet, It might just be the model that I ahve, its just the basic unit. Anyone have a Jacobs unit?

geramy

I had a Crane and it didnt even last three months...If it is the ignition dont go with Crane! (just my $0.02)

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D_Ludesions

why not try going back to stock ignition. It should be able to handel it right?

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clendaniel

Thought of that...I've got the stock coil but unfortunately my stock plug wires were misplaced when I moved. I'm waiting on a set of MSD 8.5mm's to test.

--Ian