pulley clarification

SLVRLTNG · 02-12-2003, 10:18 AM

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;)

Crockett59 · 02-12-2003, 11:05 AM

Yes, I think that the 2.7 pulley is 2#'s of boost.

Basically we swap OUR pulley for the L size

ken800 · 02-13-2003, 05:44 PM

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

02-13-2003, 07:21 PM

I have the 2.80" and it gave me about 2.5 psi when I changed it....

SLVRLTNG · 02-13-2003, 07:33 PM

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

ken800 · 02-24-2003, 12:56 AM

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

mytquik · 08-15-2003, 01:24 AM

check with troyerperformance.com.

SuperC281 · 09-23-2005, 11:58 AM

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?

Venom · 09-23-2005, 12:04 PM

bad gauge?

bgstew6 · 09-23-2005, 12:43 PM

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.

bgstew6 · 09-23-2005, 12:44 PM

and damn talk about HOLY THREAD RESURECTION!!

Venom · 09-23-2005, 12:46 PM

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.

britincali · 09-23-2005, 12:51 PM

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.

candycane184 · 12-06-2007, 06:05 PM

I got my Magnaflow 16727 at MagnaflowPlanet.com for $553.96 and Free Shipping. They had the best price I could find and still have a valid warranty. Heres the link Magnaflow 16727 Chevrolet Monte Carlo Exhaust :: Magnaflow :: www.magnaflowplanet.com

Hoffmann · 12-06-2007, 06:55 PM

Quote:

Originally Posted by candycane184

I got my Magnaflow 16727 at MagnaflowPlanet.com for $553.96 and Free Shipping. They had the best price I could find and still have a valid warranty. Heres the link Magnaflow 16727 Chevrolet Monte Carlo Exhaust :: Magnaflow :: www.magnaflowplanet.com

Quote:

Originally Posted by bgstew6

and damn talk about HOLY THREAD RESURECTION!!

Are you serious ?

again ? talking about blast from the past...an old thread resurection fever ?

02-12-2003, 10:18 AM	#1 (permalink)
SLVRLTNG Moderator Join Date: Feb 2003 Location: Redmond, WA Posts: 80 View this user's gallery iTrader: 0 / 0%	pulley clarification 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;)

02-12-2003, 11:05 AM	#2 (permalink)
Crockett59 High Voltage! Join Date: Feb 2003 Location: The Land of Confusion Posts: 1,656 View this user's gallery iTrader: 0 / 0%	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: Air filter, C&L Upper Intake, Grantelli Coils, Bassani High Flow cats, Magnaflow muffler, E-fan, 6lb lower, FTVB, SCT chip, HID's, Accufab TB, CF intake tube.....theres a bunch more but I honestly can't remember it all!

09-23-2005, 11:58 AM	#8 (permalink)
SuperC281 Junior Member Join Date: Jun 2005 Location: Live in TX, Staioned in NC Posts: 9 View this user's gallery iTrader: 0 / 0%	Vendor 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?

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02-13-2003, 05:44 PM	#3 (permalink)
ken800 Maximus Horsepowerus Join Date: Feb 2003 Location: Houston, tx Posts: 1,858 View this user's gallery iTrader: 0 / 0%	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

02-13-2003, 07:21 PM	#4 (permalink)
Smoke This Guest Posts: n/a View this user's gallery iTrader: / %	I have the 2.80" and it gave me about 2.5 psi when I changed it....

02-13-2003, 07:33 PM	#5 (permalink)
SLVRLTNG Moderator Join Date: Feb 2003 Location: Redmond, WA Posts: 80 View this user's gallery iTrader: 0 / 0%	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

02-24-2003, 12:56 AM	#6 (permalink)
ken800 Maximus Horsepowerus Join Date: Feb 2003 Location: Houston, tx Posts: 1,858 View this user's gallery iTrader: 0 / 0%	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

08-15-2003, 01:24 AM	#7 (permalink)
mytquik Former Owner Join Date: Feb 2003 Location: Tucson, AZ Posts: 1,487 View this user's gallery iTrader: 0 / 0%	check with troyerperformance.com.

09-23-2005, 12:04 PM	#9 (permalink)
Venom Superbeast Join Date: Apr 2003 Location: Abilene, Texas Posts: 3,449 View this user's gallery iTrader: 0 / 0%	bad gauge?

09-23-2005, 12:43 PM	#10 (permalink)
bgstew6 ResFirma Mitescere Nescit Paid Member Join Date: Jun 2004 Location: SoCal Posts: 17,812 NHTOC member #: 277 View this user's gallery iTrader: 0 / 0%	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.

09-23-2005, 12:44 PM	#11 (permalink)
bgstew6 ResFirma Mitescere Nescit Paid Member Join Date: Jun 2004 Location: SoCal Posts: 17,812 NHTOC member #: 277 View this user's gallery iTrader: 0 / 0%	and damn talk about HOLY THREAD RESURECTION!!

09-23-2005, 12:46 PM	#12 (permalink)
Venom Superbeast Join Date: Apr 2003 Location: Abilene, Texas Posts: 3,449 View this user's gallery iTrader: 0 / 0%	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.

09-23-2005, 12:51 PM	#13 (permalink)
britincali Registered User Join Date: Mar 2005 Location: Barstow, CA Posts: 2,434 View this user's gallery iTrader: 0 / 0%	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.

12-06-2007, 06:05 PM	#14 (permalink)
candycane184 Registered User Join Date: Dec 2007 Posts: 2 View this user's gallery iTrader: 0 / 0%	I got my Magnaflow 16727 at MagnaflowPlanet.com for $553.96 and Free Shipping. They had the best price I could find and still have a valid warranty. Heres the link Magnaflow 16727 Chevrolet Monte Carlo Exhaust :: Magnaflow :: www.magnaflowplanet.com