Want to install n2o
07-30-2009, 10:20 AM
#1
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Want to install n2o
I have a 05 cobalt ss/sc and want to install n2o, but dont know what to go with. The mods i have are gm stage 2, cai, full exhaust, stage 2 clutch, and 8lb flywheel. Do i go dry or wet shot? Wjat shot should i use? Can you please give me some suggestions and reccomendations on what to go with. And what i need to do if i install n2o.
07-30-2009, 04:29 PM
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Not to call anyone a liar, but the GM stage 2 tune goes great with a 50 wet shot. I personaly have been running the stage 2 tune and a 50 shot for nearly a year now and have not had one problem. Just make sure you do it right and not half ass and you should be fine.
07-30-2009, 05:31 PM
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Really? What would you say about a wet 75? And what exactly are your mods?
07-30-2009, 05:37 PM
#11
Stage 2 tune, don't exceed a 50 shot. Especially if you are running a smaller pulley on the stage 2 tune.
Obviously, tuning for the nitrous is the best option, but you can run it untuned if you keep the shot small and the boost reasonable. I've seen a 90 shot on a 2.9" pulley done safely with tuning, and a 75 shot on regular stage 2 pulley with no tune, but a 75 shot on stage 2/2.8" has cracked pistons in more than one car I know off, along with a 100 shot untuned on a stock car.
Obviously, tuning for the nitrous is the best option, but you can run it untuned if you keep the shot small and the boost reasonable. I've seen a 90 shot on a 2.9" pulley done safely with tuning, and a 75 shot on regular stage 2 pulley with no tune, but a 75 shot on stage 2/2.8" has cracked pistons in more than one car I know off, along with a 100 shot untuned on a stock car.
07-30-2009, 05:55 PM
#17
i plan on getting ottps dyno tune kit and running a 50 on my 2.7. cars makes awesome power now and pulls hard. Im on a custom tune i have a wideband already and an aeroforce. Im just wondering how much timing im running at WOT. I think what ima do is run it see what my AFR's are and see if im getting any KR on the aeroforce.
and was that the setup you cracked you piston on? but you spun then hooked and bogged correct? Also how muchboost were you seeing on just the 2.8? Ive seen 19.2 at WOT in the top of third at the track
and was that the setup you cracked you piston on? but you spun then hooked and bogged correct? Also how muchboost were you seeing on just the 2.8? Ive seen 19.2 at WOT in the top of third at the track
Last edited by zrated89; 07-30-2009 at 05:56 PM. Reason: Automerged Doublepost
07-30-2009, 07:01 PM
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07-30-2009, 08:52 PM
#20
i plan on getting ottps dyno tune kit and running a 50 on my 2.7. cars makes awesome power now and pulls hard. Im on a custom tune i have a wideband already and an aeroforce. Im just wondering how much timing im running at WOT. I think what ima do is run it see what my AFR's are and see if im getting any KR on the aeroforce.
and was that the setup you cracked you piston on? but you spun then hooked and bogged correct? Also how muchboost were you seeing on just the 2.8? Ive seen 19.2 at WOT in the top of third at the track
and was that the setup you cracked you piston on? but you spun then hooked and bogged correct? Also how muchboost were you seeing on just the 2.8? Ive seen 19.2 at WOT in the top of third at the track
I was about 17-18 psi tops, I had some pretty decent port work and full cooling done though.
Boost + nitrous is a winner, every time. It has a superior intercooling effect, as the nitrous is something like -150 degrees when it hits the air stream. On our cars, with such poor compressor efficency, the gains from the added cooling make for a much better power gain from a given shot size, although that gain doesn't really increase as shot size climbs. Assume a '50' shot gives you 65whp gain, a '75' shot will gain about 85whp, not 100.
Last edited by ItalianJoe1; 07-30-2009 at 08:52 PM. Reason: Automerged Doublepost
07-30-2009, 09:03 PM
#23
It's never too much boost, but at a certain point you start to have to trade off more timing to run the larger shots than the extra power is worth. Start with a smallish, 30hp shot or so, tune accordingly. If everything is manageable, bump it up one or two jet sizes at a time, re-tune for it, and stop when you are having trouble finding traction in 3rd or you stop gaining power.
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