STILLEN 370Z Supercharger System - Announcement!!!

Kastley85891

FI runs richer at WOT then N/A, however the AFR chart is not great, he is actually getting leaner at redline.

I would like 14:7.1 until 2000, transition to 13:1.1 or there about at 2500, then getting fatter to about 11:3.1 --- 11:5.1 depending on octane and other tune variables from 3000 rpm to about 6000 rpm, then fattening up a little up top, say 11:0.1 if the motor was happy. His AFR should be stable if his MAF is scaled correctly and fuel targets are requested int he correct load/rpm zones.

Tip in knock..... I would contact the injector manafacturer directly and get suggested latency figures for your injectors, give this with any actual flow calibrations from your actual injectors to a decent tuner and ask him to dial the fueling better, you will be amazed how much difference it will make.

If your tuner floored it at 4K for tuning you are missing a massive spread of tunable parameters, I would ask him to tune your lower RPM band also, your load areas at lower rpm need to be tuned , I bet this will be where you are knocking also. Did he spend any time on partial throttle or just WOT >4K?


If your knocking has gone it has probably been learnt out, which will mean you have lost power due to the new leaned parameters... reset your ECU, bet it comes back for a bit until the ecu ***** itself and corrects it for you, saves it in its little memory and pulls some timing to stop it self dying. You may find you actually have switched to a fail safe fuel table which will be even fatter in the fuel, my gas 10:..... 1

Osiris -- lets see some timing data if you have it, if you have any logs email them over, PM me if so, I will chart them for all.

I am not picking at your choice or tune , you had the balls to FI your Z and are getting on with it, good for you, but with such limited data on the tunes I am keen for more info.

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Boosted V8 hunter
2850 lbs and 375WHP