new pulley

chozen1 · August 2nd, 2007, 10:56 PM

alright i ordered the smaller pulley for my s/c thats on a roush 427. is it safe to drive around with it on without a tune until i get the time to get it to a dyno and have one made?

Emay · August 3rd, 2007, 08:54 AM

Well there are a few things to consider:

How much smaller-

How was your tune prior to this new pulley - conservative or hot?

If you running a conservative tune and only add 1 or 2 lbs, you would be okay. If your tune was hot, then I wouldn't. Especially if you can't stop yourself from pushing the car hard.

That said though, the smartest thing you can do is get the car tuned to make absolutely sure there are no issues. Your main concern is to not lean out the car.

1FastFox · August 3rd, 2007, 09:10 AM

Personally, I wouldnt run the new pulle without the tune. I know its difficult to have HP sitting around the house, but you will be thankfull in end.

chozen1 · August 3rd, 2007, 10:27 AM

thanks for the info. guess ill wait and find a good tune shop in the area even tho it will be hard having a few extra hp sitting in a box in my garage. but i believe the pulley i ordered will be changing my boost from 4-5lbs to around 7-8lbs. it said u will get an average of 25-30 more hp but a good tune they have gotten up to 50-60 more hp.

1FastFox · August 3rd, 2007, 11:17 AM

On avg. you can expect about 10 hp for lb of boost. But i think your doing the right thing...

Regency 2007 · August 3rd, 2007, 02:21 PM

A guy at a dynoshop near me gained I believe 30rwhp with a smaller pullie on his roush charger...

Roush chargers are good for keeping factory warranty and thats about it...
If you swapped you roush charger for a whipple, at the same boost level you can get another 40rwhp compared to a roush blower. Whipple is more effecient, runs cooler, and takes less power to turn.

06RedfireGT · August 3rd, 2007, 02:23 PM

Originally Posted by Regency 2007

A guy at a dynoshop near me gained I believe 30rwhp with a smaller pullie on his roush charger...

Roush chargers are good for keeping factory warranty and thats about it...
If you swapped you roush charger for a whipple, at the same boost level you can get another 40rwhp compared to a roush blower. Whipple is more effecient, runs cooler, and takes less power to turn.

thats because the Roush is a roots style blower where the Whipple is a twin-screw. The twin screw is much more efficient.

chozen1 · August 8th, 2007, 12:06 PM

woohoo pulley came in now just have to get the time to get over to the dyno shop and get it tuned.

August 2nd, 2007, 10:56 PM	#1
chozen1 Newbie 2007 Roush 427R 11.74@118.23 Join Date: Jul 2007 Location: Ft. Sill, Oklahoma Posts: 16	new pulley alright i ordered the smaller pulley for my s/c thats on a roush 427. is it safe to drive around with it on without a tune until i get the time to get it to a dyno and have one made? __________________ http://i69.photobucket.com/albums/i6...nja/motion.jpg Looks fast even standing still.

August 3rd, 2007, 08:54 AM	#2
Emay Hardcore Enthusiast 2007 Mustang GT Join Date: Oct 2006 Location: Look over your shoulder Posts: 1,596	Well there are a few things to consider: How much smaller- How was your tune prior to this new pulley - conservative or hot? If you running a conservative tune and only add 1 or 2 lbs, you would be okay. If your tune was hot, then I wouldn't. Especially if you can't stop yourself from pushing the car hard. That said though, the smartest thing you can do is get the car tuned to make absolutely sure there are no issues. Your main concern is to not lean out the car. __________________ Cardomain Page: http://www.cardomain.com/ride/2531254

August 3rd, 2007, 10:27 AM	#4
chozen1 Newbie 2007 Roush 427R 11.74@118.23 Join Date: Jul 2007 Location: Ft. Sill, Oklahoma Posts: 16	thanks for the info. guess ill wait and find a good tune shop in the area even tho it will be hard having a few extra hp sitting in a box in my garage. but i believe the pulley i ordered will be changing my boost from 4-5lbs to around 7-8lbs. it said u will get an average of 25-30 more hp but a good tune they have gotten up to 50-60 more hp. __________________ http://i69.photobucket.com/albums/i6...nja/motion.jpg Looks fast even standing still.

August 3rd, 2007, 02:21 PM	#6
Regency 2007 Hardcore Enthusiast Join Date: May 2007 Posts: 1,116	A guy at a dynoshop near me gained I believe 30rwhp with a smaller pullie on his roush charger... Roush chargers are good for keeping factory warranty and thats about it... If you swapped you roush charger for a whipple, at the same boost level you can get another 40rwhp compared to a roush blower. Whipple is more effecient, runs cooler, and takes less power to turn. __________________ My first love...

August 8th, 2007, 12:06 PM	#8
chozen1 Newbie 2007 Roush 427R 11.74@118.23 Join Date: Jul 2007 Location: Ft. Sill, Oklahoma Posts: 16	woohoo pulley came in now just have to get the time to get over to the dyno shop and get it tuned. __________________ http://i69.photobucket.com/albums/i6...nja/motion.jpg Looks fast even standing still.

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