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In need of help with microtech lt8 on stock rebuilt s4 tii

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In need of help with microtech lt8 on stock rebuilt s4 tii

Old 03-14-15, 05:47 PM
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In need of help with microtech lt8 on stock rebuilt s4 tii

I am to the point on my 1987 tii where I can fire her up and get a decent idle, but seems a little rough and rich. I have an Lt8 wired in and a stock rebuilt block with fd internals. I am running 720cc primaries, 1600cc secondaries, 42 psi fuel, Aem wideband o2, and all other corresponding gauges to monitor runnability.

I am very unfamiliar with the tuning aspect of the microtech. I have never had experience tuning, so I want to make sure I am doing things properly, that's why I made this thread to have friendly knowledgeable people try and guide me through this.

Tps is zero'd out properly
Timing was initially set to the 0 Mark, started, then timing locked on, checked and set to 5atdc. With timing lock off, it surges up/down/up/down etc. When I recheck timing, the marks are not smooth but more erratic between 0 and 5btdc. This is where I get lost.

The microtech was bought from,a friend that ran e85 on his tii which is similar in build to mine. I know there is something wrong with my map across all screens, but I have not messed to much with it other than trying to get timing and idle smoothed out, which hasn't been successful. Any and all help is very greatly appreciated. I'd like to drive my baby again sometime this year. Thanks in advance.
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Old 03-15-15, 10:03 AM
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If the engine is surging up and down, then the air/fuel ratio is wrong. Typically lean. That will cause timing to jump all over as the ECU moves through the timing map (such as it is on a Microtech) which will change based on engine speed/load.

Fuel will need to be adjusted.

You have a 0 degree mark on your pulley? FC marks as I recall are 5 and 20.
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Old 03-15-15, 10:18 AM
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I have an aftermarket crank pulley from rx7.com. It has timing marks at -20, -10, 0, and +20. Timing, I believe is correct as it says to do in the setup procedure on the manual. A/f at idle is right around 11.4. I know it's a map problem, but I am at the beginning learning stages with 0 help of understanding how to tune.
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