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Discussion Starter #1 (Edited)
currently contemplating purchasing the 2.80 dail your boost pulley from south florida. they say you have to change your sparkplugs and reprogram the ecu. my question is what do i use to do so. also what would happen if i ran the 2.80 pulley without a tune? and any word on a power programmer coming out or something along those lines so i can return my cobalt to stock incase of warrenty work.
 

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The 2.80" pulley would probably grenade your engine without a tune. The norm is no more than .2" smaller than stock when still using the stock tune. The 2.8 is about .6" smaller than the stock pulley. I'm pretty sure the stock size is a 3.40". I wouldn't recommend it, but then again nobody has actually done it. If you were to try it on the stock tune, I'd say a tank of 100 octane and at least 3 ranges colder plug. But I wouldn't do it on the stock tune. The injectors are near their capacity as it sits stock. Your only hope right now for tuning is the Powerpaq from PSI-FI Motorsports or a S-AFC II. Nobody is for sure releasing any programmers for the stock PCM. We're holding out for the PSI-FI kit, then possibly purchase the DUB system from SFPH. But my hands are tied until I can get into the PCM to make changes for the big mods.
 

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LOL, yeah go ahead and do it and let us know how it went!!!
 

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Do an exhaust and intake first, maybe a 180* thermostat, and definetely new plugs atleast one range colder, but I would go two to be safe. Then I would probably do a 3.25 pulley. See how the car likes it, and then do some PCM tuning once that service is available.
 

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Hey GTP how exactly do you tell how many "ranges" colder the plug is than stock? Just curious, info I might need to know in the near future...
 

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Just by part numbers I believe. I know on my car the recommended plugs are Autolites, with 1 step colder being 106, 2 steps colder 104, and 3 steps being 103. What they would for the Cobalt though Im not sure.
 

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Yea, all plug manufacturers use a part number change to denote heat range like a -1, -2 or like GTP was saying. Your best bet would be the 3.25 pulley with a colder plug. I'd throw a few gallons of 100 octane just to be safe too. And if you don't have a scan tool then find someone that does.
 

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MY GTP 8 U said:
Do an exhaust and intake first, maybe a 180* thermostat, and definetely new plugs atleast one range colder, but I would go two to be safe. Then I would probably do a 3.25 pulley. See how the car likes it, and then do some PCM tuning once that service is available.
I agree, maybe get stickier tires too!! The stock P-0's suck..
 
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