"Chipless" Pulley

[2Slow4You]

Anyone have experience with the billetflow 3.4 pulley? Horsepower gains? Does it actually not require a tune? Any info is appreciated.

 

[2Slow4You]

Bump, no one wants to help?

 

[cbr repsol]

Anyone have experience with the billetflow 3.4 pulley? Horsepower gains? Does it actually not require a tune? Any info is appreciated.

If your talking a eaton car ,the factory pulley is somewhere around 3.65 .So a 3.4 wouldnt do too much for you in the h.p. department. When ever you change pulleys you need to make adjustments to a/f ratio. Im thinking you would only see a gain of 20 h.p. With out putting her on the dyno youll never know. Go 2.76 or 2.8 for the best results. Also dont forget the snub idler for increased belt wrap.

 

[thomas91169]

If your talking a eaton car ,the factory pulley is somewhere around 3.65 .So a 3.4 wouldnt do too much for you in the h.p. department. When ever you change pulleys you need to make adjustments to a/f ratio. Im thinking you would only see a gain of 20 h.p. With out putting her on the dyno youll never know. Go 2.76 or 2.8 for the best results. Also dont forget the snub idler for increased belt wrap.

not necessarily.

the "Chipless" pulley gets its name because it doesnt increase the airflow enough that the stock tune cannot compensate for. However you would see more power even with the chipless pulley being tuned, but its not necessary. Though those gains would likely equal that of just a tune on a stock pulley car, so its hard to say whether or not a tune on that chipless pulley is changing much.

The point of tuning is to manually compensate for changes that the stock tune can no longer compensate for. Youre telling the tune to do what you want it to do given certain variables, IE adding/retarding timing, richening/leaning out a/f curves depending on mods, etc. If the tune you have can already accommodate any changes you made to other aspects and you dont need to change timing or a/f curves, then you dont need to make changes in the tune.

 

[2Slow4You]

I was just looking for cheap power without having to dick around with a mail order tune... Any thing better for cheap power than the pulley?

Thanks

 

[racin4ds]

I run the 3.400 pulley, it surely increased boost by at least 2psi so it obviously has to increase HP. I have the 2.76 no slip just waiting to go on but can't afford the flasher and custom tune at the moment...

 

[2Slow4You]

Did you notice much of a difference?

Thanks

 

[racin4ds]

Yes, combined with the boost bypass mod it helped a good bit, I'm liking the 2.76 much better though!