Help with base timing on 9:1 turbo motor
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Hey guys, I recently re(built) my motor after turning my stock rods in to bananas. I bored it over .040, put Supertech 84mm 9:1 compression pistons, and Manley rods. I'm very aware of the fact that lower compression means that you can get away with more timing. But I've had trouble finding a general idea of what my ignition table should look like with the new compression ratio. I am running Lars's MKTurbo churbo still. EBC is set up for 212 kpa or 16psi currently. Anyways, I wanted to get some more educated and knowledgable opinions on my current map. In my opinion it is pretty conservative accross the board, but then again there are some posts that would contradict that.
Thanks, Blayton |
That looks fine. I'd probably start with a touch less in the 137-157 rows.
Biggest impact on "safe" will be the fuel you use, which you haven't mentioned. |
Originally Posted by 18psi
(Post 1477474)
That looks fine. I'd probably start with a touch less in the 137-157 rows.
Biggest impact on "safe" will be the fuel you use, which you haven't mentioned. |
I meant Fuel quality
As in, which octane, and the actual quality of it (not all even same oct rating fuels are actually same) |
Originally Posted by 18psi
(Post 1477516)
I meant Fuel quality
As in, which octane, and the actual quality of it (not all even same oct rating fuels are actually same) |
Well then in theory you should definitely be fine.
but only a dyno and det cans/knock sensor would be able to 100% confirm |
Originally Posted by 18psi
(Post 1477521)
Well then in theory you should definitely be fine.
but only a dyno and det cans/knock sensor would be able to 100% confirm |
The best way is to set a baseline of noise which should increase as rpms increase with a known safe tune. Then set your threshold slightly above that. I'm experimenting with a knock limit 5 to 10% above baseline. Mine starts out at 5% and goes up to 15-20% at redline with a safe tune. Just have to get on a Dyno and get my Det cans working to verify when knock really does happen.
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