smaller pulley - Mustang Forum

USMCSTANG · 05-16-2010, 01:02 PM

I just got a 2008 Dan Gurney Saleen mustang and I want to change out the stock pulley on the supercharger its 4 inches. Its suppose to be pushing 6 lbs of boost 465 hp from the factory at the crank. Looking at going with a 3.50 pulley and keep it just under 10 lbs of boost if these engines can take it. Not to familiar with the 3 valves. I had an 04 Mach 1 that pushed 450 to the wheels and i that was the limit because it was stock internals with the procharger. What do you guys think? id like to get at least 450 to the wheels on this one also. i'm guessing its got around 390 maybe 400 to the wheels if that?

Troy-Stangsaver · 05-16-2010, 04:14 PM

put it on and throw it on the dyno if your under 470rwhp ur good to go.

USMCSTANG · 05-16-2010, 06:25 PM

so these engines are good for 500 rwhp? i thought they were for 450

Troy-Stangsaver · 05-16-2010, 08:21 PM

475 is max, 450 is the sweet spot

USMCSTANG · 05-16-2010, 08:28 PM

ok thanks i'm gona start saving to get a tune with the pulley in next two months.

2kanchoo · 05-17-2010, 02:30 PM

450rwhp being a good spot is true if you have a good tune. It's VITAL you make sure your air/fuel ratio is where it should be. (around 11.8, no leaner than 12.0 would be best) The first weak link tends to be the rods. If you're 450-475rwhp with a really good tune I wouldn't be worried.

USMCSTANG · 05-17-2010, 06:45 PM

i'm going to see what i can get with a good tune with the stock supercharger pulley if i can get at least 400+ to the wheels with just a tune then i'll keep it there if not i'm looking at getting a smaller pulley for it with a tune.

2kanchoo · 05-18-2010, 06:45 AM

Quote:

Originally Posted by USMCSTANG

i'm going to see what i can get with a good tune with the stock supercharger pulley if i can get at least 400+ to the wheels with just a tune then i'll keep it there if not i'm looking at getting a smaller pulley for it with a tune.

Cool. You will for sure have no problems with 400rwhp just so long as you're not too lean. Basically it comes down to detonation. I'd wager to bet the majority of all the failures from boosted s197's are because of detonation. It's just the more power you are making the more forces are involved so it takes less and less detonation for the rods to give. (hence the more power you make the better the tune needs to be).

Either way make sure your a/f is around 11.8. With it dead on 11.8 all the way through wot, you shouldn't have any problems whether you are making 400rwhp or 450rwhp.

Jeff01S281 · 05-19-2010, 02:52 PM

The 3.60 pulley is the smallest you can go on the stock fuel pump. You'll need 39lb injectors.

I have this setup on my Supercharged Saleen.

The stock belt tensioner seems to be weak on these cars too. I'd recommend the Roush tensioner. Saleen doesn't offer an aftermarket tensioner.

USMCSTANG · 05-19-2010, 05:28 PM

the dan gurney does come with 39lb injectors

USMCSTANG · 05-31-2010, 03:29 PM

so would this get me near my goal? Obviously going to need a colder plug, new belt, 3.40 pulley from blow by racing, and a tune. I'm thinking 450 if that? It already has the 39lb injectors what kind of pump is in the S197 and is the 450rwhp the max on the stock pump before going to a BAP?

2kanchoo · 05-31-2010, 03:37 PM

Quote:

Originally Posted by USMCSTANG

so would this get me near my goal? Obviously going to need a colder plug, new belt, 3.40 pulley from blow by racing, and a tune. I'm thinking 450 if that? It already has the 39lb injectors what kind of pump is in the S197 and is the 450rwhp the max on the stock pump before going to a BAP?

I'd think you would be close. I'm not sure what kind the stock pump is but I'd seriously consider a gt500 fuel pump setup or if you aren't planning on going any higher with the boost, a bap. Better to have more fuel on tap than less. Especially with boost involved.

Jeff01S281 · 06-02-2010, 03:50 PM

Quote:

Originally Posted by 2kanchoo

I'd think you would be close. I'm not sure what kind the stock pump is but I'd seriously consider a gt500 fuel pump setup or if you aren't planning on going any higher with the boost, a bap. Better to have more fuel on tap than less. Especially with boost involved.

Anything smaller than a 3.60 pulley and you should get the GT500 pumps.

I don't trust the BAP.

2kanchoo · 06-02-2010, 04:06 PM

Quote:

Originally Posted by Jeff01S281

Anything smaller than a 3.60 pulley and you should get the GT500 pumps.

I don't trust the BAP.

Yea I'm not a fan either. I haven't read too much about failures etc with them but one can't go wrong doing it right to begin with.

91gt40 · 06-02-2010, 08:10 PM

ive got a bud here that is pushing 565 on stock internals..

, he has a motor being built, but yeah.. cammed, procharged and bolt ons.. stock.. no problems yet, he did a 11.7 @ 122..

05-16-2010, 01:02 PM	#1
USMCSTANG Registered User Join Date: Mar 2003 Posts: 113	smaller pulley I just got a 2008 Dan Gurney Saleen mustang and I want to change out the stock pulley on the supercharger its 4 inches. Its suppose to be pushing 6 lbs of boost 465 hp from the factory at the crank. Looking at going with a 3.50 pulley and keep it just under 10 lbs of boost if these engines can take it. Not to familiar with the 3 valves. I had an 04 Mach 1 that pushed 450 to the wheels and i that was the limit because it was stock internals with the procharger. What do you guys think? id like to get at least 450 to the wheels on this one also. i'm guessing its got around 390 maybe 400 to the wheels if that?

05-16-2010, 04:14 PM	#2
Troy-Stangsaver I am the pwnage...Bitches Join Date: Sep 2006 Location: Vancouver Canada Posts: 729+ Posts: 3,624	put it on and throw it on the dyno if your under 470rwhp ur good to go. __________________ 07 Mustang gt troyleswick.com -729 posts

05-16-2010, 08:21 PM	#4
Troy-Stangsaver I am the pwnage...Bitches Join Date: Sep 2006 Location: Vancouver Canada Posts: 729+ Posts: 3,624	475 is max, 450 is the sweet spot __________________ 07 Mustang gt troyleswick.com -729 posts

06-02-2010, 08:10 PM	#15
91gt40 UNTAMED MUSTANG Join Date: Apr 2004 Location: Fort Hood, Texas Posts: 3,517	ive got a bud here that is pushing 565 on stock internals.. , he has a motor being built, but yeah.. cammed, procharged and bolt ons.. stock.. no problems yet, he did a 11.7 @ 122.. __________________ new.. 2001 gt, white... , upr K-member.. coil over kit, on3 turbo, DSS ProMod short block, 42 lbs inj, T-56, alluminum drive shaft, 4.10 gear, cobra interior... 480hp, 470tq w/ 12lbs.

05-16-2010, 06:25 PM	#3
USMCSTANG Registered User Join Date: Mar 2003 Posts: 113	so these engines are good for 500 rwhp? i thought they were for 450

05-16-2010, 08:28 PM	#5
USMCSTANG Registered User Join Date: Mar 2003 Posts: 113	ok thanks i'm gona start saving to get a tune with the pulley in next two months.

05-17-2010, 06:45 PM	#7
USMCSTANG Registered User Join Date: Mar 2003 Posts: 113	i'm going to see what i can get with a good tune with the stock supercharger pulley if i can get at least 400+ to the wheels with just a tune then i'll keep it there if not i'm looking at getting a smaller pulley for it with a tune.

05-19-2010, 05:28 PM	#10
USMCSTANG Registered User Join Date: Mar 2003 Posts: 113	the dan gurney does come with 39lb injectors

05-31-2010, 03:29 PM	#11
USMCSTANG Registered User Join Date: Mar 2003 Posts: 113	so would this get me near my goal? Obviously going to need a colder plug, new belt, 3.40 pulley from blow by racing, and a tune. I'm thinking 450 if that? It already has the 39lb injectors what kind of pump is in the S197 and is the 450rwhp the max on the stock pump before going to a BAP?