I'm not up on the HD upper pulley sizes so if one of you guys could "clue" me in I can make the mods list more accurate.
Does a 2.7" pulley make 2# of boost? and what are the other sizes available, thanks for the help........JR;)
I'm not up on the HD upper pulley sizes so if one of you guys could "clue" me in I can make the mods list more accurate.
Does a 2.7" pulley make 2# of boost? and what are the other sizes available, thanks for the help........JR;)
Yes, I think that the 2.7 pulley is 2#'s of boost.
Basically we swap OUR pulley for the L size
Proud owner of a 2002 Harley Davidson F150
Mods: Kenne Bell 2.3L, Chickenears Ram Air Intake, JLP intake plenum, Weapon X Coils, Bassani High Flow cats, Magnaflow muffler, Troyer Performance E-fan, 4lb lower, FTVB, SCT chip, HID's, Accufab TB, REM Carbon Fiber intake tube, High Flow Water Pump, LFP Heat exchanger, .....theres a bunch more but I honestly can't remember it all!
I think (i very well could be wrong) that the asp upper is 2.8" and is a 2-3 lb pulley for the L. If that is the case, it should be a 4-5lb pulley for the HD since you are getting the first 2lbs back from losing the 3.25" pulley and then picking up another 2-3lbs over the stock 2.93" L upper pulley.
Ken
I have the 2.80" and it gave me about 2.5 psi when I changed it....
Thanks for the replies, maybe I should just leave it at the diameter for now, until I can get some definite answers. I will look into this ordeal for all......JR
Silver...
Jake is right...
to be exact:
lower is 7.4... upper @2.7 would be 7.4/2.7= 2.7407 ratio...
to get the relative boost number on a stock L upper, that would be X/2.93=2.7407. X=8.03.
A JL 3lb pulley is rated at 8.17" according to the infamous blowerrpm.xls. That means that 2.7 should be right there...
BTW, who is selling a 2.7" upper?
Ken
check with troyerperformance.com.
I bought mine from JLP, but I got a 2.7 up top and a #4 crank but I only see 9 psi on the gauge. Thats with no slippage,I have 2 100mm idlers in place of the 90mm. Any suggesttions why?
bad gauge?
Your 4#lb should measure 8.5 inches in Diameter that alone would put you near 10 on hte boost gauge. With a 2.7 upper in that combo you should be seeing around 14.
you have bad boost gauge.
and damn talk about HOLY THREAD RESURECTION!!
also if you read Ford Truck Performance Mag, they found that the stock airbox cost some boost/HP at higher levels. So if you still have the stock box, that may cost you 1-1.5 lbs.
I slapped the L upper on yesterday and this morning at half throttle I saw 11 psi, im tring my best to stay out of the juice until I hit the dyno, oh 8.5" lower 2.93 upper.
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