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-   -   Race engine tuning in "over-run" (http://forums.pelicanparts.com/911-engine-rebuilding-forum/1082396-race-engine-tuning-over-run.html)

JoeMag 01-03-2021 12:40 PM
Race engine tuning in "over-run"
 
For those who have tuned race motors, what sort of fuel "tuning" do you do in over-run? Cut off fuel or have a target AFR you're look'n for?

TimT 01-03-2021 01:13 PM
Cut Off.

Unless you like backfires, pops, and wasting race fuel.

JoeMag 01-04-2021 11:18 AM
Thanks!

dannobee 01-04-2021 01:57 PM
Nearly always a fuel cut.

TimT 01-05-2021 03:25 PM
Quote:
Nearly always a fuel cut.
However there is always someone who wants the fireworks, to be loud, and possibly blow apart their exhaust..

jpnovak 01-05-2021 04:26 PM
Yep. Fuel cut and crank up the timing. Grab that off-throttle decel.

dannobee 01-05-2021 05:52 PM
Quote:
Originally Posted by TimT (Post 11167843)
However there is always someone who wants the fireworks, to be loud, and possibly blow apart their exhaust..
Prolly the same guy who pulls a money shift, then says, "but it has a rev limiter on it, why did it bend the valves?? We'd see that once in awhile, too.

JoeMag 01-07-2021 10:19 AM
Thanks... how does cranking up timing help w decel if no fuel is going in?

Though I must say I loved the massive flames my 930 racer used to make. One time I glanced in mirror on a shift and they were above rear deck!


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