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Old 12-03-2021, 11:41 AM   #1
cajunzl1
 
Drives: 2018 ZL1
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Lower Pulley Boost Increase Comparison

I have a 2018 ZL1 with a green filter and TM ported throttle body Stock Tune

I'm considering a balancer and pulley swap soon. I'm taking baby steps first and I'm looking at three pulley sizes:

8.6 (7.5%)
9.06 (12%)
9.10 (13.75%)

Keeping the stock upper 2.5 pulley, does anyone have any idea what the boost increase would be for each or any of the above sizes??

TIA
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Old 12-03-2021, 11:51 AM   #2
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https://www.metcomotorsports.com/pro...ankPulleyRings
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Old 12-03-2021, 01:00 PM   #3
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Thanks, that helps!

Curious if anyone out there obtained those increases after installation?

And if I read correctly I need to upgrade the crank seal to an LS seal?
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Old 12-03-2021, 01:56 PM   #4
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Really recommend headers if you are adding a lower pulley. You will need a tune anyway and pushing more air in will require a more efficient exhaust system on the back side.
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Old 12-03-2021, 02:30 PM   #5
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Quote:
Originally Posted by cajunzl1 View Post
Thanks, that helps!

Curious if anyone out there obtained those increases after installation?

And if I read correctly I need to upgrade the crank seal to an LS seal?
Seems to be recommended but I didn't replace mine when I did the balancer swap and have had no issues so far after 1500 mules
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Old 12-03-2021, 02:32 PM   #6
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Pulleys would be my last mods. I’d get an upgraded heat exchanger, coolant reservoir and ceramic coated headers first. I’d also add flex fuel if it’s available in your area. You will be adding heat with pulleys.
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Old 12-03-2021, 03:02 PM   #7
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Wish we did have E85 here local, but nearest station is 25 miles away.

I know the headers would help and possibly drop the boost a little, but was just looking for mild upgrade ..

If the 8.6 would truly provide a 2lb increase that would satisfy me for now...(maybe).

Its a daily driver and use 93, just didnt want to go to much further than that and risk knocking and too much additional heat. Of course it'll be tuned too.

May upgrade the heat exchangers too.
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Old 12-03-2021, 07:41 PM   #8
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Quote:
Originally Posted by cajunzl1 View Post
Wish we did have E85 here local, but nearest station is 25 miles away.

I know the headers would help and possibly drop the boost a little, but was just looking for mild upgrade ..

If the 8.6 would truly provide a 2lb increase that would satisfy me for now...(maybe).

Its a daily driver and use 93, just didnt want to go to much further than that and risk knocking and too much additional heat. Of course it'll be tuned too.

May upgrade the heat exchangers too.
I don't see how a 7.5% increase will add 2 psi of boost. The supercharger only produces about 9.4 psi in stock form. A 7.5% increase is only 0.7 psi. I could be wrong in how that is calculated, but I'd be surprised if it's actually 2 psi with a 7.5% OD pulley.

If it's only 0.7 psi, it won't add that much heat (about 14-15 deg F over stock compressed temperature).
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Old 12-03-2021, 08:08 PM   #9
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Quote:
Originally Posted by cajunzl1 View Post
Wish we did have E85 here local, but nearest station is 25 miles away.

I know the headers would help and possibly drop the boost a little, but was just looking for mild upgrade ..

If the 8.6 would truly provide a 2lb increase that would satisfy me for now...(maybe).

Its a daily driver and use 93, just didnt want to go to much further than that and risk knocking and too much additional heat. Of course it'll be tuned too.

May upgrade the heat exchangers too.

You would need a 9.17" to get close to 2PSI. The 8.6 isnt going to provide much.


Also, your engine is a big air pump. If your moving more air in, you must move more air out or its simply not efficient.
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