How much timing is too much?
How much timing is too much? I presently am seeing 30* WOT with little or no knock. It showed a 2 HP gain pretty much across the board compared to 29* but with 29* , I got absolutely no KR and with 30* I get .5* KR sometimes. How much timing is everyone else running?
Re: How much timing is too much? im not sure but if your seeing gaqins and no knock then u must be gong in the right direstion (imo) im pritty sure its one of those things where you'll know when its too much by the loss of hp
Re: How much timing is too much? These motors dont really need anymore timing above about 28-29 degrees due to the efficient combustion chambers. Look at the post Jason 99T/A made about what high timing and poor fuel did to his pistons!
Re: How much timing is too much?
These motors dont really need anymore timing above about 28-29 degrees due to the efficient combustion chambers. Look at the post Jason 99T/A made about what high timing and poor fuel did to his pistons!
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Joined: Aug 2002
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From: Sherwood, AR
Re: How much timing is too much? Yep, detonation did in those pistons. That's why I said advance the timing until you get a little KR, then back it off. Fuel is important also. I always run 93 octane, so it's easy to tune for it. Outside temp can also cause detonation, so you need to factor that in. As long as your A/F is somewshere around 13.0 (what I tune for with my techedge) and I'm not getting any knock, the engine is safe.
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Re: How much timing is too much? I would also caution against using too much timing. I did in a set of pistons because of a tune with too much timing.
The thing about detonation from too much timing is that it can be present without hearing it or having any KR show up.
The mail order tune I got had mine way too advanced right in the heart of the daily driving range (too much throughout for that matter, but the worst at 1,800 to 2,200) - I never heard a ping or saw any KR where you tend to watch for it most.
I had a live data scanner instead of a data recorder, so that may have had something to do with it. I may have been saved if I was logging with ATAP vice watching live.
Just my 2 cents - Is 2 HP really worth the thousands it will cost you later?
The thing about detonation from too much timing is that it can be present without hearing it or having any KR show up.
The mail order tune I got had mine way too advanced right in the heart of the daily driving range (too much throughout for that matter, but the worst at 1,800 to 2,200) - I never heard a ping or saw any KR where you tend to watch for it most.
I had a live data scanner instead of a data recorder, so that may have had something to do with it. I may have been saved if I was logging with ATAP vice watching live.
Just my 2 cents - Is 2 HP really worth the thousands it will cost you later?
Re: How much timing is too much? It is sort of an old wives tail that more lead is better. In fact, you generally want to arrange the engine to minimize the lead it takes. In my experience, max hp is usually a couple degrees back from knock.
Re: How much timing is too much? From the bit of timing tuning I've been doing, there's more to be gained in editing the tuning in the midrange rather than the peak. I've got mine running a max of 29 deg peak, but have the area in front of and after the torque peak bumped up by about 4-5 deg. I've also seen jagged dyno graphs from too high of timing, yet the engine was showing no KR. The timing was pulled back 2 deg and the curve smoothed right out even though the car lost a few peak hp.
Re: How much timing is too much?
I don't agree. If you can run 35 degrees of timing with no knock, run 35. Keep going up a little at a time until you run in to some KR, then back it off a bit.
Also keep in mind that your car will run leaner on the street and the strip than it will on a Dynojet.
With my 422ci we had 29 degrees but we ramped it back to 25 degrees and it made the same power. If I were you I'd tune that stroker for a 12:1 AF on a Dynojet.