I am working on a friends car, its a YSi trim 383. We are expecting 850rwhp, and are looking at ignition options. I have never used an opti past 700rw, my personal car that made over 900rw, I ran a coil per cyl setup.
We had to gap the plugs down to .025 to get the thing to light off at high boost, even with a BTM-6
Those of you making ~800rw, what are you doing for ignition?

 

I've made 680 rwhp with an auto/loose converter using the stock Opti, MSD coil, and Crane HI-6. I've run it as high as 21 psi with no mis-fire. I think my plug gap is somewhere around .030".

I did have an ignition problem for a while - a severe backfire only at high boost. I replaced the old MSD coil with a new one and the problem went away totally.

Mike

 

Stock opti, with riveted rotor contact

Stock coil

MSD Digital 6

 

interesting. MSD said they were "not surprised' it blew the spark out with only a 6 series box.

Maybe I just need to keep the gap that small. I ran .035 on my coil per cyl setup with out fail, however.

 

Hmmm, Dan at work here also has a Dig 6 on his turbo 347ci SBF that made 1,020rwhp.

 

So you know if the Digital 6 is "better" than the 6 bTM analog box?

 

I don't know for certain, but I believe they have the same output.

We run .032 on our cars fwiw. Not sure why you would be having a problem.

System voltage steady? Wiring/grounds good? What coil?

 

MSD coil, grounds are (supposedly) good. I mean, car crank fine. I am going to replace the coil/head to chassis ground.

 

An easy thing to try would be swapping in a stock coil, I've had better results with stock than MSD's.