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Old 10-20-2000, 03:03 AM   #1
Scooby Newbie
Member#: 65
Join Date: Jul 1999
Location: San Ramon CA, USA
Post ITC Q's. Both n/a and turbo

I'm thinking about getting an ITC for n/a now and turbo later. How do I tune it? I know I'm suppost to advance for n/a and retard the timing for turbo but scared to mess with it.

What settings do you guys have for n/a and turbo?

Do I have to have J&S for safety?
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Old 10-20-2000, 08:31 AM   #2
Sean McElderry
Scooby Specialist
Member#: 526
Join Date: Nov 1999
Location: Beaverton, OR, USA
1995 Supra Turbo


For both turbo and N/A:

Do some 4th gear WOT runs and advance timing 2-3 degrees at a time above 5000rpm. When you hear detonation, back the timing off 2-3 degrees in that range.

Then start advancing timing between 2500 and 5000rpm. 2-3 degrees at a time until you hear ping. Then back it off a couple of degrees.

Basically, you want to run as much advance as you can get away with. Yes, there are points where you can run too much advance and rob yourself of performance, but I think the engine will knock far before then.

After you have tuned WOT in 4th gear, drive around town and simulate all driving conditions. WOT in 1st, 2nd, 3rd, etc. Normal cruising. Slow acceleration. Listen VERY carefully for knock during these situations. If you hear knock, back off timing at that RPM.

If you are getting knock at WOT before advancing timing, then you need to retard timing. This may be the case with an aftermarket turbo. Retard timing 5 degrees at a time wherever you are getting knock. Then start advancing until you hear knock. Then retard it 2-3 degrees and you're done.

No, you do not need the Safeguard...but if it makes you feel safer, go ahead and put it in

If you have any other questions, feel free to email me.


[This message has been edited by Sean McElderry (edited October 20, 2000).]
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