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C6 Corvette ZR1 & Z06General info about GM’s Corvette Supercar, LS9 Corvette Technical Info, Performance Upgrades, Suspension Setup for Street or Track
2.35 Pulley Setup NEW - Comes with LPE 2.35 Pulley, 2x Metco 50mm Idlers, 2x ATI Spacers 915992 and the Gates Belt part #K120815HD (You have to trim 1 rib off of this belt). This is the BEST combo for the 2.3 pulley, LOTS of members running this setup with 0 slip!
$400 + shipping
I trimmed my belt with just a large sharp utility knife. The blade fits right in the groove. It cuts easily. I then just ran the cut edge on my stationary belt sander to pretty it up. That's really not needed though.
As a new member to ZR1 ownership please help me to understand the gain in such a change. I keep seeing the sale of the pulley system but I do not understand the benefits and what else I would need to do.
As a new member to ZR1 ownership please help me to understand the gain in such a change. I keep seeing the sale of the pulley system but I do not understand the benefits and what else I would need to do.
Thanks,
Stephen
It's all about spinning the rotors faster by changing the pulley ratio. You can make the snout pulley (driven) smaller and/or make the crank pulley (driver) larger. The upside is more boost the downside is more heat.
This is in contrast to the N/A vettes which use an under drive lower pulley to reduce the belt speed relative to the engine speed to pickup more power by reducing parasitic losses.
Here is a breakdown from LPE:
10 Bolt Supercharger Pulley Choices stock balancer
2.60 inch - 19% OD - 18,300 RPM supercharger speed*
2.35 inch - 32% OD - 20,300 RPM supercharger speed*
10 Bolt Supercharger Pulley Choices overdrive balancer
2.60 inch - 36% OD - 20,800 RPM supercharger speed*
2.35 inch - 50% OD - 23,000 RPM supercharger speed*
So I was planning on doing a LPE 710 Kit which uses a 2.6" upper and then I'd do full exhaust but if I can do a 2.35 and still see decent temps (Stock cooling equipment) then I'll go that way. Is this possible? or am I better off with a 2.6 if not upgrading injectors, heat exchanger, etc.
LPE 710 is CAI, snout, 160 degree t-stat and 2.6" upper for those who don't know.
Last edited by Can'tHave2MuchHP; 11-12-2016 at 06:40 PM.
It's all about spinning the rotors faster by changing the pulley ratio. You can make the snout pulley (driven) smaller and/or make the crank pulley (driver) larger. The upside is more boost the downside is more heat. This is in contrast to the N/A vettes which use an under drive lower pulley to reduce the belt speed relative to the engine speed to pickup more power by reducing parasitic losses. Here is a breakdown from LPE: 10 Bolt Supercharger Pulley Choices stock balancer 2.60 inch - 19% OD - 18,300 RPM supercharger speed* 2.35 inch - 32% OD - 20,300 RPM supercharger speed* 10 Bolt Supercharger Pulley Choices overdrive balancer 2.60 inch - 36% OD - 20,800 RPM supercharger speed* 2.35 inch - 50% OD - 23,000 RPM supercharger speed* *Measured at 6,500 RPM engine speed / Stock supercharger speed 15,400 RPM
It's all about spinning the rotors faster by changing the pulley ratio. You can make the snout pulley (driven) smaller and/or make the crank pulley (driver) larger. The upside is more boost the downside is more heat.
This is in contrast to the N/A vettes which use an under drive lower pulley to reduce the belt speed relative to the engine speed to pickup more power by reducing parasitic losses.
Here is a breakdown from LPE:
10 Bolt Supercharger Pulley Choices stock balancer
2.60 inch - 19% OD - 18,300 RPM supercharger speed*
2.35 inch - 32% OD - 20,300 RPM supercharger speed*
10 Bolt Supercharger Pulley Choices overdrive balancer
2.60 inch - 36% OD - 20,800 RPM supercharger speed*
2.35 inch - 50% OD - 23,000 RPM supercharger speed*
Good info. Something I've been wondering... Does the ZR1 overheat on the track with a pulley kit if the Supercharger is allowed to spin above 20k RPM or is it OK because of better air flow?
Supposedly, part of the reason the C7 Z06 overheats is on account of its smaller 1.7L supercharger spinning to the tune of 21,500 RPM ... that and air flow issues.
Good info. Something I've been wondering... Does the ZR1 overheat on the track with a pulley kit if the Supercharger is allowed to spin above 20k RPM or is it OK because of better air flow?
This was from a LPE 710 kit. Stock lower pulley, 2.6 upper = 18,300 rpm. Does that answer your question?
Good info. Something I've been wondering... Does the ZR1 overheat on the track with a pulley kit if the Supercharger is allowed to spin above 20k RPM or is it OK because of better air flow?
Supposedly, part of the reason the C7 Z06 overheats is on account of its smaller 1.7L supercharger spinning to the tune of 21,500 RPM ... that and air flow issues.
Yes, you will have massive IAT2 problems on the stock cooling system.
There are two things going on with the heat: compressing the air and efficiency. Compressing air will create heat no matter what. Per rotation the 2.3 is displacing about 35% more air and therefore more heat. So apples to apples 21,500 RPM on the 1.7L is equal to 15,900 RPM in air displaced (boost) and the associated heat of compression not taking into account differing efficiencies. As you spin the rotors faster you get diminishing returns, meaning proportionally the heat rises faster than boost is created.
Edit: I didn't mean it to sound like the 1.7L is less effecient just because is spins faster. I meant spinning the blower faster than it was designed to operate will yield a diminishing return.
11-11-2016, 11:54 AM
ZR1 LPE Pulley System
