2.9 pulley with GM stage 2, reliable?
08-07-2009, 12:00 AM
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2.9 pulley with GM stage 2, reliable?
Hi guys, like the title said, I wondering if it safe to run a 2.9 pulley with the GM stage 2 kit ? It must stay really safe... so, any opinions?
Thanks, Fred
Thanks, Fred
08-08-2009, 01:21 AM
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It's not worth it because if you heat up and boost more you'll prob end up pulling timing and w/e.
Take the 50 for the 2.9 and put it towards a 3.0 and custom tune, trust me you can get a good thing going with 3.0 and 42's
.
Take the 50 for the 2.9 and put it towards a 3.0 and custom tune, trust me you can get a good thing going with 3.0 and 42's
.
08-08-2009, 01:26 AM
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08-08-2009, 03:48 PM
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Hard to take a decision.. some say its great, and other say its not recommended... I think that I'll keep my 3.0 pulley...
Guys with 2.9 pulley on stage 2, did you really noticed a difference over the 3.0 ?
Guys with 2.9 pulley on stage 2, did you really noticed a difference over the 3.0 ?
08-08-2009, 08:03 PM
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I'll check it out...
08-08-2009, 08:12 PM
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stage 2 pulley size is 3.065. through personal experience i would vote no. my car was LEAN on the low end. if you drop to a 2.9, find a dyno that can rear air/fuel, and make sure you're safe. people tend to only look at the injector flow rates and not the air/fuel ratio.
one thing to note is, there are people who will swear its safe and have proof, while there will be others (like me) who say don't do it. every car is a little different and will take to mods differently. you can either play it really safe (keep the stage 2 pulley), somewhat safe (throw the 2.9 on and do a dyno run to check everything out), or be really dangerous and just do it and not look back. lol. i chose the 3rd route and luckily i did my tune a lot sooner than originally planned.
btw, i didn't notice really any difference. boost picked up slightly sooner, but i didn't have any cooling, so i really didn't feel a power difference. at times felt slower than stage 2.
one thing to note is, there are people who will swear its safe and have proof, while there will be others (like me) who say don't do it. every car is a little different and will take to mods differently. you can either play it really safe (keep the stage 2 pulley), somewhat safe (throw the 2.9 on and do a dyno run to check everything out), or be really dangerous and just do it and not look back. lol. i chose the 3rd route and luckily i did my tune a lot sooner than originally planned.
btw, i didn't notice really any difference. boost picked up slightly sooner, but i didn't have any cooling, so i really didn't feel a power difference. at times felt slower than stage 2.
08-08-2009, 08:25 PM
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stage 2 pulley size is 3.065. through personal experience i would vote no. my car was LEAN on the low end. if you drop to a 2.9, find a dyno that can rear air/fuel, and make sure you're safe. people tend to only look at the injector flow rates and not the air/fuel ratio.
one thing to note is, there are people who will swear its safe and have proof, while there will be others (like me) who say don't do it. every car is a little different and will take to mods differently. you can either play it really safe (keep the stage 2 pulley), somewhat safe (throw the 2.9 on and do a dyno run to check everything out), or be really dangerous and just do it and not look back. lol. i chose the 3rd route and luckily i did my tune a lot sooner than originally planned.
btw, i didn't notice really any difference. boost picked up slightly sooner, but i didn't have any cooling, so i really didn't feel a power difference. at times felt slower than stage 2.
one thing to note is, there are people who will swear its safe and have proof, while there will be others (like me) who say don't do it. every car is a little different and will take to mods differently. you can either play it really safe (keep the stage 2 pulley), somewhat safe (throw the 2.9 on and do a dyno run to check everything out), or be really dangerous and just do it and not look back. lol. i chose the 3rd route and luckily i did my tune a lot sooner than originally planned.
btw, i didn't notice really any difference. boost picked up slightly sooner, but i didn't have any cooling, so i really didn't feel a power difference. at times felt slower than stage 2.
Someone already installed an Interceptor gauge on cobalt's ? I bought it before for my GTP and I read on the Aeroforce website that it needed 3 wires to make run the gauge but mine only have the red one, with my obdII plug of course, Is it will work all the same? On wich power source could I plug the red wire?
Thanks, Fred
08-08-2009, 10:48 PM
#15
I don't know, I went from a 3.0 pulley to 2.9 pulley and my A/F went up about .5 or so at WOT so I needed a new tune. I don't think I'd feel safe going all the way from 3.065 to 2.9, but that is just me. Your injectors aren't going to be maxxed out on a 2.9 pulley. Mine are at 76% so all is well. Obviously elevation could play an important role.
08-09-2009, 12:43 PM
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My IDC's were at 122% @7K rpm. I ran GM Stage 2 on 2.9 for over 2 years with no issues at all. But the injectors are considered 'maxed out' at 80%. So maybe that will give you an idea on how hard the injectors are working if they're at 120%+.