Originally Posted by coony3737
All I'm going off is the debate on the forum as to what is the best pulley for making power. Needswings is only on a 178mm pulley but is running better times than most with the larger pulleys. I would expect the extra ~4-5lbs. of boost to provide significantly more pull, but 1/4 mile times have yet to confirm this. Did you see ANY difference in intake temp when switching from the stock pulley to the 185? I would've thought by compressing the air even more there would be a rise in temp. My main focus here is that if there was any change to the intake temps., why not use meth and drop it back down to stock temps if not below. No matter where you are, cooler temps=more power.
In the next month or so I'll ordering up a 185 pulley, heat exchanger, johnson pump, and a water/meth kit. Hopefully I can get some dyno #'s with and w/out meth. Hopefully gains will be made and I will post numbers as soon as possible.
-Josh
Josh,
I think you are on the right road if 1/4 mile times are your goal. I personally don't race and only a few SRT owners have actually installed the 185 so side-by-side comparisons can be hard to judge.
The 178mm pulley that NW sells is manufactured by ASP http://www.aspracing.com/frame.htm and is a stock crank pulley with the outer belt ring removed and a larger one press fitted onto the hub.
The 185mm pulley is only 4% larger then a 178 so you can estimate boost and IAT gains from that. 1/4 mile times also include a lot of other parameters, IE.. Weather, elevation, track, tires, exhaust cutouts, fuel, etc..
It's well known that you can clamp the signals from your IAT, MAP, and engine temp sensors to prevent your ECU from pulling timing. Even a stock SRT can then lay down some pretty impressive 1/4 mile times. So take it all with a grain of salt.... I've even seen videos and pictures of SRT folks removing their intake filters to improve their 1/4 mile times.
My IAT’s did increase somewhat with the 185, but not greatly - by separating my IC coolant system from the engine coolant and going with the LET HE my IAT's are very tame compared to other Turbo/Supercharged engines.
Good luck with your mods...