Smaller pulley = higher boost at low RPM?
06-29-2007, 08:16 PM
#1
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Smaller pulley = higher boost at low RPM? Hi,
I got D1SC with 4.10 and just using the car cruising around town, etc ...
Would smaller pulley like 3.85 get me to higher boost at lower RPM's?
Thanks,
-Mike @ www.corvettestripes.com
I got D1SC with 4.10 and just using the car cruising around town, etc ...
Would smaller pulley like 3.85 get me to higher boost at lower RPM's?
Thanks,
-Mike @ www.corvettestripes.com
06-29-2007, 08:21 PM
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yes, on a blower, boost is proportional to rpm's
the greater the rpm's the more boost. take a look at some of the dyno graphs on epp's website, the the graph is almost a diagnol line
the greater the rpm's the more boost. take a look at some of the dyno graphs on epp's website, the the graph is almost a diagnol line
06-29-2007, 11:34 PM
#6
Here is my thoughts on it.
I have my car setup to shift at 6200 RPM instead of the normal 6700-7000 RPM that a lot of people do. I just speed up the blower to max out it out earlier. I think this helps better area under the curve and with my low 3.23-3.42 gear ratio it should drop me in my peak TQ range between shifts not taking as long to get into my powderband since I shift at 6200. Perfect for a street car IMO, plus you don't have to kill the motor with RPMS to make crazy power
The only downside I see with this is you need to watch the small pulleys making sure you don't have belt issues.
BTW I will be sporting a 3.2 with a 7.65 crank pulley on my D1SC.
I have my car setup to shift at 6200 RPM instead of the normal 6700-7000 RPM that a lot of people do. I just speed up the blower to max out it out earlier. I think this helps better area under the curve and with my low 3.23-3.42 gear ratio it should drop me in my peak TQ range between shifts not taking as long to get into my powderband since I shift at 6200. Perfect for a street car IMO, plus you don't have to kill the motor with RPMS to make crazy power
The only downside I see with this is you need to watch the small pulleys making sure you don't have belt issues.
BTW I will be sporting a 3.2 with a 7.65 crank pulley on my D1SC.
06-30-2007, 12:22 AM
#7
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Originally Posted by 02NBMFormula
yes, on a blower, boost is proportional to rpm's
the greater the rpm's the more boost. take a look at some of the dyno graphs on epp's website, the the graph is almost a diagnol line
the greater the rpm's the more boost. take a look at some of the dyno graphs on epp's website, the the graph is almost a diagnol line
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06-30-2007, 01:01 AM
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Originally Posted by T/A KID
Here is my thoughts on it.
I have my car setup to shift at 6200 RPM instead of the normal 6700-7000 RPM that a lot of people do. I just speed up the blower to max out it out earlier. I think this helps better area under the curve and with my low 3.23-3.42 gear ratio it should drop me in my peak TQ range between shifts not taking as long to get into my powderband since I shift at 6200. Perfect for a street car IMO, plus you don't have to kill the motor with RPMS to make crazy power
The only downside I see with this is you need to watch the small pulleys making sure you don't have belt issues.
BTW I will be sporting a 3.2 with a 7.65 crank pulley on my D1SC.
I have my car setup to shift at 6200 RPM instead of the normal 6700-7000 RPM that a lot of people do. I just speed up the blower to max out it out earlier. I think this helps better area under the curve and with my low 3.23-3.42 gear ratio it should drop me in my peak TQ range between shifts not taking as long to get into my powderband since I shift at 6200. Perfect for a street car IMO, plus you don't have to kill the motor with RPMS to make crazy power
The only downside I see with this is you need to watch the small pulleys making sure you don't have belt issues.
BTW I will be sporting a 3.2 with a 7.65 crank pulley on my D1SC.
I have 450 rwtq @ 3000 and almost 550 rwtq @ 4000
06-30-2007, 06:34 AM
#9
One thing a lot of people are doing is going with a smaller pulley and a restrictor plate. If your wanting more power down low, but don't want to fry your motor at the top end this is a very good solution. The guys at ECS have been doing this a lot lately and the new dyno sheets look much better.
07-01-2007, 12:15 AM
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Originally Posted by jkz06
One thing a lot of people are doing is going with a smaller pulley and a restrictor plate. If your wanting more power down low, but don't want to fry your motor at the top end this is a very good solution. The guys at ECS have been doing this a lot lately and the new dyno sheets look much better.
Any belt slipping issue? What kind of bracket y'all using for 3.2 pulley?
Thanks,
-Mike
***BTW, are your 3.2 6 rib or 8 rib?
07-01-2007, 02:18 AM
#11
The only downside I see with this is you need to watch the small pulleys making sure you don't have belt issues.
Jim
07-01-2007, 07:39 AM
#12
[QUOTE=MikeC5Vert]That what I wanted
Any belt slipping issue? What kind of bracket y'all using for 3.2 pulley?
Thanks,
-Mike
Sorry but i'm not a supercharger guy. I've just read a lot of people saying good things about the plates. If you would call East Coast Supercharging they would be able to give you a lot better info than I could.
Any belt slipping issue? What kind of bracket y'all using for 3.2 pulley?
Thanks,
-Mike
Sorry but i'm not a supercharger guy. I've just read a lot of people saying good things about the plates. If you would call East Coast Supercharging they would be able to give you a lot better info than I could.
