Pulley Combo Question
09-13-2016, 11:24 AM
#21
09-13-2016, 04:59 PM
#23
Team Owner
My car sees 24psi with race filter, 22psi with street filter, and 18-19psi with a dirty street filter. All without changing pulleys. Makes 1200+ anywhere over 22psi, and ~1100 with a dirty filter.
09-13-2016, 05:46 PM
#25
Team Owner
12psi worth of powwa
09-13-2016, 05:47 PM
#26
I would like around 650 rwhp... Guess I have been caught up on boost because I have always had GT500's and 03/04 Cobra's, and knew I could run 19-20lbs of boost max on 93 pump, and whatever power it put out is what I got! I always whippled the cars and put the pulley combos to make this boost. My car has the stock bottom end so I just wanted to stay within the limits of max "boost", with 93+ 100% meth. This is my first Vette that I have ever modified! Thanks for reply!
09-14-2016, 02:50 PM
#27
Racer
You're a good candidate to swap the rear pulleys side to side. That will convert the supercharger from underdriven to overdriven. Then buy you a 3.8" pulley for the front. Should put you @ 10 to 11psi the way you're configured and should give you a nice bump in HP and TQ. With the big front pulley and a correct sized belt, you shouldn't have any trouble with belt slip.
You can get genuine Maggy pulleys from superchargerconnection dot com or aftermarket pulleys from pulleyboys dot com.
Make sure your fuel delivery is up to the task. Fuel injectors as well as fuel pump may be too light for the job. For sure, get it re-tuned after you up the boost.
You can get genuine Maggy pulleys from superchargerconnection dot com or aftermarket pulleys from pulleyboys dot com.
Make sure your fuel delivery is up to the task. Fuel injectors as well as fuel pump may be too light for the job. For sure, get it re-tuned after you up the boost.
I am taking the car to the shop this coming Monday, as per the Tech at the shop has told me that i should see a 20whp increase per pound of boost added with the pulleys, also had recommended that they will keep on the safe side with the tune since i am running on a stock bottom end...any thoughts?
09-14-2016, 07:14 PM
#28
Le Mans Master
I am taking the car to the shop this coming Monday, as per the Tech at the shop has told me that i should see a 20whp increase per pound of boost added with the pulleys, also had recommended that they will keep on the safe side with the tune since i am running on a stock bottom end...any thoughts?
The following users liked this post:
StallionCorvette (09-20-2016)
09-20-2016, 12:52 PM
#29
Racer
Absolutely keep the tune on the safe side. You can gain a few hp by going from low 11's to high 11's on the AFR. An extra degree or two of advance gets you a little too. Just not worth it in my book. You may not get a full 80hp bump by adding 4psi. Probably 20hp/psi on the first two and 15hp/psi on the last two. That's been my experience anyway. Regardless, you're going to like it
The fact that i am on a stock bottom end scares the beejesus out of me...yet i don't track the car at all but i do push it when on a roll..
Is it a favorable point to go overdrive? I can still tell them to do it, they just order the pulleys (2.9) overnight them by tomorrow at noon.
My question is: is it worthy performance wise, will it hurt my motor that much boost with the overdrive 10%?
Man thank you, you have been a great help!
*Token good for a cold one!
Last edited by StallionCorvette; 09-20-2016 at 12:55 PM.
09-20-2016, 03:50 PM
#30
Le Mans Master
The blower speed using the pulley combo that your shop wants to use will result in a blower rpm of 13339 at 6000rpm engine speed. That's using a 2.9" front pulley leaving the rears underdriven.
If you swap sides with the rear pulleys to make it overdriven, a 3.8" front pulley will result in 13,776 blower rpm at 6000 engine rpm. Not really enough of a difference to argue about.
What is not arguable is the fact that you're going to have belt slip if you use that tiny front pulley. That's a given. A 3.8" front pulley is WAY less likely to slip vs a 2.9". That extra few hundred rpm on the blower won't make a quarter pound difference in peak boost.
There are quite a few LS2's and 3's bumping around at that boost level. With a good tune, good fuel, and plenty of it, you won't have a problem.
If you swap sides with the rear pulleys to make it overdriven, a 3.8" front pulley will result in 13,776 blower rpm at 6000 engine rpm. Not really enough of a difference to argue about.
What is not arguable is the fact that you're going to have belt slip if you use that tiny front pulley. That's a given. A 3.8" front pulley is WAY less likely to slip vs a 2.9". That extra few hundred rpm on the blower won't make a quarter pound difference in peak boost.
There are quite a few LS2's and 3's bumping around at that boost level. With a good tune, good fuel, and plenty of it, you won't have a problem.
The following users liked this post:
StallionCorvette (09-21-2016)
09-20-2016, 06:50 PM
#31
Do you have your dyno sheet? Did it keep pulling or lose a little power around 6500?
Last edited by usmcpony; 09-20-2016 at 07:07 PM.
09-22-2016, 07:47 PM
#32
Racer
The blower speed using the pulley combo that your shop wants to use will result in a blower rpm of 13339 at 6000rpm engine speed. That's using a 2.9" front pulley leaving the rears underdriven.
If you swap sides with the rear pulleys to make it overdriven, a 3.8" front pulley will result in 13,776 blower rpm at 6000 engine rpm. Not really enough of a difference to argue about.
What is not arguable is the fact that you're going to have belt slip if you use that tiny front pulley. That's a given. A 3.8" front pulley is WAY less likely to slip vs a 2.9". That extra few hundred rpm on the blower won't make a quarter pound difference in peak boost.
There are quite a few LS2's and 3's bumping around at that boost level. With a good tune, good fuel, and plenty of it, you won't have a problem.
If you swap sides with the rear pulleys to make it overdriven, a 3.8" front pulley will result in 13,776 blower rpm at 6000 engine rpm. Not really enough of a difference to argue about.
What is not arguable is the fact that you're going to have belt slip if you use that tiny front pulley. That's a given. A 3.8" front pulley is WAY less likely to slip vs a 2.9". That extra few hundred rpm on the blower won't make a quarter pound difference in peak boost.
There are quite a few LS2's and 3's bumping around at that boost level. With a good tune, good fuel, and plenty of it, you won't have a problem.
Any thoughts on it Old Motor Head?
Again thank you for your advices.
**more tokens for cold ones for you!! (at this rate will be cheaper to buy a new z06 than to keep handing you free beers of appreciation hahaha)
09-23-2016, 08:17 AM
#33
Le Mans Master
They need to watch the duty cycle on the injectors. Some of the early jackshaft Maggie kits came with 65# injectors. Vast majority of them came with LS9 (52#) injectors though. 52#er's aren't big enough. I'm betting you'll need to upgrade there too.
The following users liked this post:
StallionCorvette (09-24-2016)
09-24-2016, 01:22 AM
#34
Racer
What "grinds my gears"is the fact that now with more WHP and the MSD on the car I feel that I lost some of that nice chopping sound from the cam yet the car does not feel like it's gasping for fuel so if anything it is even more Street friendly..
The tune was safe and the numbers that show on the Mustang Dyno were 630whp 630tq yet as per the tuner those numbers were taken after the car was tuned and it already had 7/8 passes on the Dyno so that heat soak might have affected the "paper bragging numbers" but there was no time to let the car cool off and getting it back on the dyno. When I picked it up car was cold, weather was very humid (Florida) streets also wets been raining a lot lately over here so really I didn't fully tested. When I got the courage and my V1 gave me the go ahead and the highway seemed dryer I pushed it a little bit and BOY OH BOY! It pulls like a freight train!
Still I would have loved to get the final numbers on a sheet of papers, I might take it to another place were they can Dyno it just to see exactly where I am standing.
I was advised not to do E85 or even meth injection...so that said I don't know if a have reached my limit on molding my car without affecting anything since I am on stock internals. Thoughts?
09-24-2016, 09:32 AM
#35
Le Mans Master
You're at a good place power wise. I'm guessing your Vette is infinitely more fun now vs before. Your motor may be running smoother with less chop because the tuner did a really good job.
If you need a dyno number and pretty power curve, find you a shop with a dynojet and some cool air.
You could add a meth system for a little more octane and safety. If you have access to quality 93 octane, I wouldn't bother though. Just enjoy it...safely
If you need a dyno number and pretty power curve, find you a shop with a dynojet and some cool air.
You could add a meth system for a little more octane and safety. If you have access to quality 93 octane, I wouldn't bother though. Just enjoy it...safely
The following users liked this post:
StallionCorvette (09-24-2016)
09-24-2016, 04:04 PM
#36
Racer
You're at a good place power wise. I'm guessing your Vette is infinitely more fun now vs before. Your motor may be running smoother with less chop because the tuner did a really good job.
If you need a dyno number and pretty power curve, find you a shop with a dynojet and some cool air.
You could add a meth system for a little more octane and safety. If you have access to quality 93 octane, I wouldn't bother though. Just enjoy it...safely
If you need a dyno number and pretty power curve, find you a shop with a dynojet and some cool air.
You could add a meth system for a little more octane and safety. If you have access to quality 93 octane, I wouldn't bother though. Just enjoy it...safely
Yeah you are right OMH. I think i will stay this way for now, the car hasn't create any extra heat at all if anything less than before. I will try doing some research on what is a good 93 high octane grade fuel...Shell V-Power?