A9L2 Sealevel Spark Bias for GT40 3 Bar Heads

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Chris93Cobra
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Vehicle Information: 1993 Cobra #493. X3Z - Procharger D1SC 11PSI, FTI Cam, 1-3/4 Long Tube BBK, BBK X-Pipe, Flowmasters, 3.55 Gears. Full Maximum Motorsports Suspension. Falken RT-615K+ Tires, Quarterhorse.

A9L2 Sealevel Spark Bias for GT40 3 Bar Heads

Unread post by Chris93Cobra »

Hi Mike,

Can you help me understand how to read your table and apply spark bias to the stock A9L2 table?

I have GT40 3-bar heads. So your table has 24 deg for boosted, 34 deg for n/a and 45 deg for cruise. How do I apply this against your stock table?

Thanks,
Chris
decipha
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Re: A9L2 Sealevel Spark Bias for GT40 3 Bar Heads

Unread post by decipha »

post your tune

basically at na loads command 34 deg at wot in boost drop it to no more than 24

na load on a 302 with gt40s should be around .85 load and at 10 lbs around 1.3 load over 3k rpm. About .7 load below 3k and maybe .95 in boost down low.
Chris93Cobra
Posts: 4
Joined: 2021 Aug 01, 16:35
Location: St. Paul, MN
Vehicle Information: 1993 Cobra #493. X3Z - Procharger D1SC 11PSI, FTI Cam, 1-3/4 Long Tube BBK, BBK X-Pipe, Flowmasters, 3.55 Gears. Full Maximum Motorsports Suspension. Falken RT-615K+ Tires, Quarterhorse.

Re: A9L2 Sealevel Spark Bias for GT40 3 Bar Heads

Unread post by Chris93Cobra »

Here it is.
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