Concentrate on the ignition system. Concentrate on making it PERFECT and see if you don't stumble onto the problem while in the process.
What Should I Rev Too?
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5.0Droptop
...all those nights we shared, and you're a dude??
Special Agent Mukity-Muck Whats in Charge Round Here
I run those numbers on a stock ignition system with a stock coil and boost-A-Spark on Taylor wires with an MSD cap and rotor.
I don't believe in em, for the most part. All it does it take your long duration fat spark and replace with short duration skinny one. Multi-sparks only last until 3000 rpm. So you'd get no benefit up top.
What I think you need is to find the problem with your current ignition system.
I'm going to disagree with noobz here... Running an MSD box on it would be wise if your running nitrous or even a turbo. Turn the factory rev limiter to say 9999 and control the limit on the box. Factory limiter cuts fuel not spark msd box cuts spark. You go cutting fuel on a nitrous car if you tap the limiter with it on it will go KABOOM
5.0Droptop
...all those nights we shared, and you're a dude??
Special Agent Mukity-Muck Whats in Charge Round Here
oh. Those are low numbers for a 347 on a dynojet.
My buddy was down about 100 horse on his 347. It was almost identical to mine. Turned out the timing chain marks were not dot to dot it was a tooth or two off and caused the power loss.
I deff have stalled dot to dot- the distrib looks a tooth off though would this cause such a loss?
5.0Droptop
...all those nights we shared, and you're a dude??
Special Agent Mukity-Muck Whats in Charge Round Here
Ive read here on stangnet that the tooth off on the dizzy is kinda BS because as long as you can turn the dizzy enough to set the timing then it dont matter. I have a particular way that i stab the dizzy on the 302's i have done. I never had one a tooth off so i cant say for certian if it really matters.
f8tlfiveo
My wife likes my spool and blow-off valve.
I agree.. As long as you can turn the distributor far enough you are fine..if you could spin the dizzy 360 deg you could just throw it in and turn it till you got what you wanted..
That's cool... I know that there are folks out there who have had a lot of success with an aftermarket box and swear by them. For me, thye've been mostly hype and not a lot of function. For the OP though... He's got a problem that will likely not be solved by blindly tossing parts at it. Were I the OP and my problem were sluggish throttle response, breaking up under boost off-idle, or intermittent power loss/backfires, I might suggest a multi-spark to fix a weak ignition.
This problem here though.... sounds like the various pieces and parts are not up the task or worn out. I also suspect (just a suspicion) that the coil is not being saturated. Maybe from either a bad ground or low voltage. Another suspicion is that the TFI might be a knock off or that the PiP is in it's golden years not firing in perfect time.
All suspicions and no way to way to tell without standing infront of it. I haven't seen much that the OEM ignition system can't do on street driven vehicle running pump gas.
i agree with all noobz347 last comments exept the ignition box.....im still going with tfi or pip cause ive been thru both more than once, do you have a code reader? that showed me the way to a bad pip or just buy one of each and swap cause you should have a spare in glovebox with these cars anyway. Good luck hope u find the power btw my car made 364rwhp and 385rwt corrected on a very stingy mustang dyno (actual numbers before correction were 382rwhp 402rwt) with a small intake making power only to 5500rpms, so there might be some power loss with those heads
thanks guys i will work on diagnosing the tfi pip and coil, and check all the basics an go from there. The other most brought up issue could be vavle springs but i dont believe that ... yet
You are talking about two different uses for an msd box, it's one thing to want it as a limiter, but for performance gains or repairing a spark issue, they are useless.
Agreed, the stock ignition will support pretty much anything you can throw at it.Another suspicion is that the TFI might be a knock off or that the PiP is in it's golden years not firing in perfect time.
All suspicions and no way to way to tell without standing infront of it. I haven't seen much that the OEM ignition system can't do on street driven vehicle running pump gas.
I believe he said somewhere above he had a dyno module or similar for a TFI, which i can pretty much say for sure is a POS, they are all crap except the original ford.
that statement alone for me is enough to put an MSD in box for me. i personaly dont like how the factory computer does the limiter.
