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2008-2009 Racecraft Mustang For discussion of the 2008-09 Racecraft 420S Mustang. Owners of the 2007-08 "Sleeper GT" can also find help here.

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Old 05-05-2009
Jeepngli Jeepngli is offline
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Join Date: Mar 2009
Location: NJ
Posts: 178
Default What size is our pulley?

I've been told different stories by different people and companies. Does anyone know for sure(ie- they've taken the pulley off and measured) what size our Racecrafts come with? Its tough to measure with the pulley on the engine and I've only been able to get vague measurements. What have you guys found? Thanks!
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Old 06-14-2009
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Dave Dave is offline
Join Date: Feb 2006
Location: Penn
Posts: 11,950

I would think it would be the same size and an S281 S/C. Where is the conflicting data coming from?

If all fails contact MJ/Saleen and post your findings.
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Old 10-15-2009
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mosaleen mosaleen is offline
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Join Date: Dec 2007
Location: Joplin, Mo.
Posts: 762

The Racecraft came with the blue inj. and had the 465 or some say 475 bhp system. The S/C pulley size is 3.87
The 435 bhp S/C pulley size is 4.00

If you all change the S/C pulley to 3.60 and my mosaleen S/C idler system and JDM or Performanc Auto Sports tune you will kick those WS - 6's (*&(&(&&(&(*&)...
2005 S/C #10 Press Car w/ Scenic Roof
3.20 S/C Pulley & 18% overdrive Crank
Mosaleen S/C no slip idler system
3:73 gears, Watts link Gen II
14" front brakes, slotted rear rotors
Brenspeed 302, 47lb inj, longtubes/ catted H-pipe 570 rwhp 545 rwtq (SAE) 13.5 lbs boost, Afco heat exchanger
F-5 Joplin Mo. Tornado surviour 5-22-11.
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Old 10-15-2009
Jeepngli Jeepngli is offline
SOEC Member
Join Date: Mar 2009
Location: NJ
Posts: 178

Thanks. I did end of finding out that the Racecrafts come with the 3.87" pulley. The only thing different b/c the 420HP and 475HP models is that the airbox is cutout and has a more aggressive tune.

I am awaiting my retune from JDM with their intake and calibrated MAF. This should put me close to 400WHP. I dynoed at 373WHP/377WTQ SAE. I have an offroad xpipe which should put me close to 400WHP with the tuning. I may do a 3.6" pulley in the spring. I'm between a 3.4" and 3.6". Depends if I wanna do the fuel pumps.
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