Ignition timing with aluminum heads - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 4 Old 04-20-2003, 03:48 PM Thread Starter
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Ignition timing with aluminum heads

I have TFS TW heads and an Incon 800TTi kit. What are you guys running for ignition timing with similar combos? How much boost and fuel pressure?


1993 LX hatch
Incon 800TTi, AFR heads, Holley intake, stock cam
11.21 @ 124

480 whp, 520 wtq (10 psi)
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post #2 of 4 Old 04-20-2003, 08:19 PM
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Steed93,

My combination is similar to yours, the details are on my webpage.

The stock EEC ignition curve is a poor compromise for an Incon and all other turbo systems.

I've sampled base timing between 5* to 10*, and know the shortcomings of each.

I can run 5* base on 91 octane (the highest available here) safely at 9# boost in 100* heat. But, the engine is not as crisp and responsive at lower rpm's at this setting. Power at high rpm is also lacking.

If I set base to 10*, I experience detonation at 3000rpm under the same conditions. But, the engine is much more responsive off idle, and the increased power above 4500rpm is noticeable.

Turbo engines need a timing curve that reduces mid-range advance while leaving the low and high speed timing alone. I suggest you contact Brian Renegar (his link is on my page) to see the progress he's made in solving this.

Unless you have a Tweecer, custom chip, or other method to modify your timing curve, don't make the same mistakes I've made -- be safe and begin your tune conservatively.



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89 GT conv., Incon 800 turbo
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post #3 of 4 Old 04-27-2003, 01:08 PM
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hey george, how much boost are you running?

Shaun

393"/twin T70/full accessory/billet ITB intake/stock hood/alum. 3.5" exhaust

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post #4 of 4 Old 04-27-2003, 07:57 PM
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I'd get some kind of tweecer, set it to 20 total at torque peak, and add some back up top.

If you're not getting a chip/tuner, then I'd set base at 8-10degrees, and start with the boost around 8lbs and work your way up. With no chip/tuner, FMUs actually work pretty decent. I had good luck putting the fp at 60 at full boost with the FMU. When I pulled the FMU it wanted to detonate, so I had to bring the timing way down up top via tweecer.

95 street sleeper
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