D1-sc on a stock LS1 , pulley size to make 9 PS1
08-01-2006, 12:12 AM
#1
D1-sc on a stock LS1 , pulley size to make 9 PS1 Hi
what size pullie are you guys running to make 9 PSI with your D1-sc , on your stock LS1 motor?
I have a 4.0 , and a 4.25 8 rib pullies for my D1-sc,
my car is getting tuned very soon,
so i need to know what size pullie will make about 9 PSI.
i have the 4.25 on there now, but the car is not dyno tuned so i cant get on it at all.
Procharger is telling me that the 4.25 will make 13 psi and the 4.5 will make 10-11 psi,
my friend has a P1-sc installed on his stock LS1, and he makes 9-10 psi with his 4.0 pullie,
so i figured the bigger 4.25 would slow down the d1 a bit and give me the same boost as a P1 with a 4.00
well i dont know
let me know what u think
thank you for your help
My car is a 01 SS M6
accfab 75mm T-body
Razor methonal injection
Fikse 17" mag wheels ,9" front 10.5 rear, with 315 BFG drag radials
soon installing FLP long tubes with test pipes, (no cats).
what size pullie are you guys running to make 9 PSI with your D1-sc , on your stock LS1 motor?
I have a 4.0 , and a 4.25 8 rib pullies for my D1-sc,
my car is getting tuned very soon,
so i need to know what size pullie will make about 9 PSI.
i have the 4.25 on there now, but the car is not dyno tuned so i cant get on it at all.
Procharger is telling me that the 4.25 will make 13 psi and the 4.5 will make 10-11 psi,
my friend has a P1-sc installed on his stock LS1, and he makes 9-10 psi with his 4.0 pullie,
so i figured the bigger 4.25 would slow down the d1 a bit and give me the same boost as a P1 with a 4.00
well i dont know
let me know what u think
thank you for your help
My car is a 01 SS M6
accfab 75mm T-body
Razor methonal injection
Fikse 17" mag wheels ,9" front 10.5 rear, with 315 BFG drag radials
soon installing FLP long tubes with test pipes, (no cats).
08-01-2006, 03:39 AM
#2
With bone stock exhaust you would want a 4.50 pulley to see 9 psi. With headers and a cat back your 4.25 should be about right. I'd leave the 4.25 on there and install the headers right away before you get it tuned. Bob
08-02-2006, 03:57 AM
#6
TrakDay's car is a GTO, which uses a smaller ATI crank pulley than the f body's come with. Since the ATI crank pulley is smaller on the GTO, you can't compare what boost his GTO makes with his blower pulley. Bob
08-02-2006, 11:17 AM
#7
Originally Posted by Exotic Performance Plus
TrakDay's car is a GTO, which uses a smaller ATI crank pulley than the f body's come with. Since the ATI crank pulley is smaller on the GTO, you can't compare what boost his GTO makes with his blower pulley. Bob
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08-15-2007, 06:58 PM
#11
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not trying to highjack the thread but how do you measure the pullies? the diameter across the whole thing or where the belt would actually sit? do they make an 8" crank pullie? what would an 8" and 3.75" pullie make on a d1sc?
08-16-2007, 04:12 AM
#12
Where the belt sits is where you would measure. There is a stamped number on the side of the pulley that lets you know what size it is. ATI does not make a larger crank pulley, but we have had larger crank pulley's made in the past. ASP could probably supply you with a larger crank pulley.
As far as how much boost you would make, it depends on your combination, and your elevation and what you rev the engine to. Bob
As far as how much boost you would make, it depends on your combination, and your elevation and what you rev the engine to. Bob
08-16-2007, 12:11 PM
#13
Originally Posted by Lawnboy
Procharger is telling me that the 4.25 will make 13 psi and the 4.5 will make 10-11 psi
08-16-2007, 02:32 PM
#14
Originally Posted by Gold Phoenix
That is funny. I talked to a guy at SDPC with my engine combo for my Formula and he told me that with a 7.25" crank/4.25" blower pulley I would see atleast 16psi of boost at 6000rpm. Well, I got it all running and I am only seeing 10-12psi. I still have a 4" and 3.7" pulley to play with.
Somebody was smokin something... lol Bob
08-16-2007, 03:37 PM
#15
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I have the pulley set up that comes with the Procharger 8lb kit which I believe is a 7.65" crank and a 4.5" blower pulley. (Bob is this correct?)
I see about 9.5psi on a stock heads, stock cam, stock bottom end motor. I have headers, no cats and magnaflow catback.
On a side note what is the impeller speed with the stock pulley set up, Bob?
I see about 9.5psi on a stock heads, stock cam, stock bottom end motor. I have headers, no cats and magnaflow catback.
On a side note what is the impeller speed with the stock pulley set up, Bob?
08-18-2007, 06:37 AM
#16
Originally Posted by No Juice
I have the pulley set up that comes with the Procharger 8lb kit which I believe is a 7.65" crank and a 4.5" blower pulley. (Bob is this correct?)
I see about 9.5psi on a stock heads, stock cam, stock bottom end motor. I have headers, no cats and magnaflow catback.
On a side note what is the impeller speed with the stock pulley set up, Bob?
I see about 9.5psi on a stock heads, stock cam, stock bottom end motor. I have headers, no cats and magnaflow catback.
On a side note what is the impeller speed with the stock pulley set up, Bob?
To determine the impeller speed, the following formula is used:
Maximum impeller speed= crankshaft pulley diameter (N1) divided by supercharger pulley diameter (N2),
multiplied by the step-up ratio (4.10 for the P-1SC/D-1SC), multiplied by engine rpm at redline.
lmpeller RPM = (N1/N2) x 4.10 x engine RPM
41,820 rpm is what I come up with on my 2nd cup of coffee if you shift at 6000 rpm. Bob
