Vortech pulley question???
Thread Starter
Burning Brakes
Joined: May 2006
Posts: 816
Likes: 0
From: Georgetown Indiana
Vortech pulley question???
I have a 2000 with LT's and S trim vortech which dynoed at 498rwhp corrected using a 3.6 pulley. My question is how much hp/tq should I gain going to a 3.0 pulley and a course how safe will it be? Or if i go with a 3.4 pulley will I see enough difference? Keep in mind that I do not have meth but will be adding it either way I go. Next question is how much power I would be adding with 3.0 pulley plus meth and 3.4 plus meth?
Thanks guys
Thanks guys
Tech Contributor
Joined: Apr 2007
Posts: 10,924
Likes: 78
From: Forney Texas
It depends on how well and aggressively the car is tuned now as well as how it is tuned afterwards. I figure it should make about 620+rwhp on a nice meth tune with a 3.0 pulley. Go down to the 3.4 and I'll guess about 560.
Melting Slicks
Joined: Aug 2005
Posts: 3,398
Likes: 2
I also have a 3.6 pulley but also with a restrictor plate added and made 525 rwhp. I never wanna use meth and wanted to keep a very conservative tune with stock bottom end and clutch so its just fine for me as is but could easily bump it up some if need be taking restrictor plate out.
If dropping pulley size make sure your tuner knows what the heck he is doing with timing and fuel trims....
If dropping pulley size make sure your tuner knows what the heck he is doing with timing and fuel trims....
Last edited by briann510; Aug 28, 2008 at 07:25 PM.
Le Mans Master
Joined: Sep 2001
Posts: 8,840
Likes: 43
From: State of Confusion.
I have a 2000 with LT's and S trim vortech which dynoed at 498rwhp corrected using a 3.6 pulley. My question is how much hp/tq should I gain going to a 3.0 pulley and a course how safe will it be? Or if i go with a 3.4 pulley will I see enough difference? Keep in mind that I do not have meth but will be adding it either way I go. Next question is how much power I would be adding with 3.0 pulley plus meth and 3.4 plus meth?
Thanks guys
Thanks guys
I'm not sure where Georgetown, Indiana is, but make sure you use a good tuner if you do either. That'll make all of the difference in how long your motor lasts.
A couple of good ones are EPP (forum vendor) and GLM (Chad @ Green Light Motorsports). Jesse Bubb @ Wait4me Performance is also VERY good, but I think that he only does mail order tunes.
Good Luck!
Burning Brakes
Joined: Sep 2004
Posts: 1,089
Likes: 4
From: Ocala FL
I have a 2000 with LT's and S trim vortech which dynoed at 498rwhp corrected using a 3.6 pulley. My question is how much hp/tq should I gain going to a 3.0 pulley and a course how safe will it be? Or if i go with a 3.4 pulley will I see enough difference? Keep in mind that I do not have meth but will be adding it either way I go. Next question is how much power I would be adding with 3.0 pulley plus meth and 3.4 plus meth?
Thanks guys
Thanks guys
When I changed from a 3.6 to 3.4" pulley I picked up 37rwhp
running a forged 346 and S-trim.
Right now I'm running a 3.0" pulley but haven't dyno'd it.
A rule of thumb is 20rwhp for every 1 psi increase in boost.
Another rule of thumb: Vortech says 1 to 1.5 psi increase in
boost for each drop in pulley size.
Check their website for pulley size increments.
After adding meth I just kept adding timing until knock
then backed off a little (meth hp is difficult to figure).
Le Mans Master
Joined: Sep 2001
Posts: 8,840
Likes: 43
From: State of Confusion.
I forgot in my earlier post...... I run a 3.4" pulley with the restrictor plate along with an ECS meth kit and am around 500-525 rwhp, but haven't dynoed/tuned the boost VE table yet. This is through an A4 with a SY3500 converter too.
If I were to want to do what you want to, I'd put the meth on and bolt up the 3.0" pulley and see what she'll do! If it gets to be too much, then put a restrictor plate in and you'll be all set.
Good Luck!
If I were to want to do what you want to, I'd put the meth on and bolt up the 3.0" pulley and see what she'll do! If it gets to be too much, then put a restrictor plate in and you'll be all set.
Good Luck!
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Le Mans Master
Joined: Sep 2001
Posts: 8,840
Likes: 43
From: State of Confusion.
916/795 rwhp C5R 412 YSI
Joined: May 2005
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The S-Trim has a Max Impeller Rating of 50K RPM, Max Impeller Efficiency at 45K RPM resulting in 72% Adiabatic Efficiency. If the compressor starts generating excessive heat then you will be robbed you of boost. So if you are running a crank pulley size of 7.5", with a pulley size of 3.4 then you will hit Max Impeller RPM at Engine RPM of 6570 RPM and Max Impeller Efficiency @ Engine RPM of 5913. By dropping to a 3.0 pulley size you will hit Max Impeller RPM at Engine RPM of 5797 RPM and will hit Max Impeller Efficiency @ Engine RPM of 5217. Most look for their power at peak torque curve and not peek HP curve and try to pulley for that range and normally do not rev the engine for any extended period of time at those RPM's.
This information is important because as you heat soak the air you are injecting you will loose its effectiveness. I personally favor Alky to cool things down at high boost levels and removing IC's which can drop as much as 1 to 3 PSI.
This information is important because as you heat soak the air you are injecting you will loose its effectiveness. I personally favor Alky to cool things down at high boost levels and removing IC's which can drop as much as 1 to 3 PSI.
Last edited by c52k1vert; Aug 30, 2008 at 09:52 PM.
Le Mans Master
Joined: Sep 2001
Posts: 8,840
Likes: 43
From: State of Confusion.
The S-Trim has a Max Impeller Rating of 50K RPM, Max Impeller Efficiency at 45K RPM resulting in 72% Adiabatic Efficiency. If the compressor starts generating excessive heat then you will be robbed you of boost. So if you are running a crank pulley size of 7.5", with a pulley size of 3.4 then you will hit Max Impeller RPM at Engine RPM of 6570 RPM and Max Impeller Efficiency @ Engine RPM of 5913. By dropping to a 3.0 pulley size you will hit Max Impeller RPM at Engine RPM of 5797 RPM and will hit Max Impeller Efficiency @ Engine RPM of 5217. Most look for their power at peak torque curve and not peek HP curve and try to pulley for that range and normally do not rev the engine for any extended period of time at those RPM's.
This information is important because as you heat soak the air you are injecting you will loose its effectiveness. I personally favor Alky to cool things down at high boost levels and removing IC's which can drop as much as 1 to 3 PSI.
This information is important because as you heat soak the air you are injecting you will loose its effectiveness. I personally favor Alky to cool things down at high boost levels and removing IC's which can drop as much as 1 to 3 PSI.
Thanks for sharing it!
Le Mans Master
Joined: Sep 2001
Posts: 8,840
Likes: 43
From: State of Confusion.
The S-Trim has a Max Impeller Rating of 50K RPM, Max Impeller Efficiency at 45K RPM resulting in 72% Adiabatic Efficiency. If the compressor starts generating excessive heat then you will be robbed you of boost. So if you are running a crank pulley size of 7.5", with a pulley size of 3.4 then you will hit Max Impeller RPM at Engine RPM of 6570 RPM and Max Impeller Efficiency @ Engine RPM of 5913. By dropping to a 3.0 pulley size you will hit Max Impeller RPM at Engine RPM of 5797 RPM and will hit Max Impeller Efficiency @ Engine RPM of 5217. Most look for their power at peak torque curve and not peek HP curve and try to pulley for that range and normally do not rev the engine for any extended period of time at those RPM's.
This information is important because as you heat soak the air you are injecting you will loose its effectiveness. I personally favor Alky to cool things down at high boost levels and removing IC's which can drop as much as 1 to 3 PSI.
This information is important because as you heat soak the air you are injecting you will loose its effectiveness. I personally favor Alky to cool things down at high boost levels and removing IC's which can drop as much as 1 to 3 PSI.
Wouldn't the blower impeller rpms change if you put an 8" 8 rib on?
Good Luck!
