How much timing?

Talk EMS and Computer related performance

Postby $200GT-4 » Sun Mar 29, 2009 4:10 pm

15-16? Weak, I'd be thinking closer to 20 with 11.5:1AFR. I realize the 3S may or may not like more/less timing than the 4A-GZE I tuned, but I had it tuned to 25 degrees at 14-15psi and it absolutely loved it. I initially set it to 20 degrees advance under boost and every time I advanced the timing it gave a very noticeable seat of the pants difference. When I tore the engine down to come back to the states, there was NO indication of detonation. 15 to me is just atrocious, unless we're talking turbo'ing 11:1 CR Honduhs.
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1993 GT-4 w/FMIC, N/A cams, 3" DP, MBC, AFM tune, and WAI.
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Postby sleeper » Sun Mar 29, 2009 4:38 pm

$200GT-4 wrote:15-16? Weak, I'd be thinking closer to 20 with 11.5:1AFR. I realize the 3S may or may not like more/less timing than the 4A-GZE I tuned, but I had it tuned to 25 degrees at 14-15psi and it absolutely loved it. I initially set it to 20 degrees advance under boost and every time I advanced the timing it gave a very noticeable seat of the pants difference. When I tore the engine down to come back to the states, there was NO indication of detonation. 15 to me is just atrocious, unless we're talking turbo'ing 11:1 CR Honduhs.



hehe.. unless you have tested it on a 3sgte engine you should not recomend anything!

that engine will not be safe on 20 degree timing.. it does not like that.. trust me..
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Postby pinoyGT4 » Thu Sep 24, 2009 4:23 pm

so what really is the safest, but will still give you ample power, timing for the 3sgte?

can anyone indicate if there are specific timing for the different 3s generations and turbo that is equipped? stock turbo only.. :D

for example me, im running a 2nd gen 3s with a CT26... JDM GT4.. :D

what should be the appropriate timing for me? :D
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Postby Mafix » Thu Sep 24, 2009 5:17 pm

in your case. none. take classes. learn. asking on the internet is not going to get you anywhere. rent a dyno and learn.
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Postby pinoyGT4 » Fri Sep 25, 2009 1:24 am

Mafix wrote:in your case. none. take classes. learn. asking on the internet is not going to get you anywhere. rent a dyno and learn.


ohh... i thought i could learn a bit here.. and dyno here is too expensive, so i wanted to learn a few things before hitting the rollers..

and i dont think this is just "internet" coz the site is all about celicas and mostly GT4s.. :)
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Postby Mafix » Fri Sep 25, 2009 12:25 pm

yes but this is a thing that has no play in it and a horribly expensive learning curve (as you've already seen)
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Postby bozo-merlin » Fri Sep 25, 2009 3:41 pm

2 friend and i have GT4 and the same ECU

first one is motor engineer, he did his maps himself as he knows what he do.

second take the first maps as base map and because he have different mod maps are definitively not the same.

And then I took final second maps as the second friend and i share a lot of mod, trust me : nothing works nice, i have to consider 2nd final map as base map too.

First time i tried it i could ear knock without detcan or det view meter.


Any local climat, any engine, any different thing made the map different, and as we want to drive more than 50miles around the house we have to make it safer than better.
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