Nitrous C8
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Safety Car
Joined: Jun 2004
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From: Witness Protection Program Somewhere, USA
Nitrous C8
Saw a C8 at the LS Fest this weekend running a twin bottle nitrous setup. I assume that a tune would be needed and wondering if someone has been able to crack the ECM?
He would purge it out the passenger side scoop. Kind of cool.
He would purge it out the passenger side scoop. Kind of cool.
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Joined: Jul 2020
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My guess is they have some way to retard the timing, perhaps with a piggyback ignition controller.
Le Mans Master
Joined: Jul 2000
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From: North Dallas 40 TX
That would depend on the system, wouldn't it? If it is supplying fuel and nitrous at the proper ratios, what would you tune? I see a suggestion of timing retard, but wouldn't a rich mixture compensate so that isn't required. Maybe not optimum, but workable. also since AFR adjustment is always active, it should compensate as long as there is enough supplement fuel? Someone has already done a 100 HP shot.
Two bottles is for show. Or someone who doesn't like to refill.
Two bottles is for show. Or someone who doesn't like to refill.
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Joined: Jul 2020
Posts: 64
Likes: 22
That would depend on the system, wouldn't it? If it is supplying fuel and nitrous at the proper ratios, what would you tune? I see a suggestion of timing retard, but wouldn't a rich mixture compensate so that isn't required. Maybe not optimum, but workable. also since AFR adjustment is always active, it should compensate as long as there is enough supplement fuel? Someone has already done a 100 HP shot.
Two bottles is for show. Or someone who doesn't like to refill.
Two bottles is for show. Or someone who doesn't like to refill.
Even on a 100 shot, you probably need to pull at least a few degrees of timing to avoid knock. That said, the ECU probably will do this on its own once it detects knock, but you really don't want to rely on that type of reactionary control.
Le Mans Master
Joined: Jul 2000
Posts: 6,559
Likes: 4,501
From: North Dallas 40 TX
You can only get away with a very small shot if you don't pull some timing, and this already assumes that the air fuels are being kept in check via a wet shot + built-in ECU corrections.
Even on a 100 shot, you probably need to pull at least a few degrees of timing to avoid knock. That said, the ECU probably will do this on its own once it detects knock, but you really don't want to rely on that type of reactionary control.
Even on a 100 shot, you probably need to pull at least a few degrees of timing to avoid knock. That said, the ECU probably will do this on its own once it detects knock, but you really don't want to rely on that type of reactionary control.
