08-31-2023, 07:00 PM | #1 |
Drives: 2019 ZL1 Join Date: Oct 2020
Location: Colorado Springs
Posts: 164
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Boost and pulley combo question
I have a magnuson 2650 swapped on. I have an 80mm upper and 10.35 lower. How much boost should I be making?
For reference, last time I had a 75mm upper and 9.45 lower that made 16psi in my crappy DA. I was having belt slip though so we decided to go with a bigger upper and lower. |
08-31-2023, 07:18 PM | #2 | |
Drives: 2017 Camaro 2SS A8 Join Date: Aug 2018
Location: Petersham MA
Posts: 4,760
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You might want to look at TooHighPSI’s LT5 tensioner and 10-rib upgrade which I run on my combo (18 psi). The LT5 tensioner has more tension and greater travel…just a better piece across the board. Hope that helps.
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2017 Chevy Camaro 2SS A8 Whipple 3.0, Mast Black Label heads, Fore triple in-tank pumps, 112mm TB, LPE +52% injectors, LPE BB HPFP, 15” conversion 1059 WHP/944 WTQ, 9.48@150
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08-31-2023, 07:43 PM | #3 | |
Drives: 2019 ZL1 Join Date: Oct 2020
Location: Colorado Springs
Posts: 164
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08-31-2023, 08:37 PM | #4 | |
Drives: 2017 Camaro 2SS A8 Join Date: Aug 2018
Location: Petersham MA
Posts: 4,760
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Quote:
Where is the tensioner in its travel range? The belt should be tight as heck to put on (it’ll loosen up a tick once you start running it hard).
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2017 Chevy Camaro 2SS A8 Whipple 3.0, Mast Black Label heads, Fore triple in-tank pumps, 112mm TB, LPE +52% injectors, LPE BB HPFP, 15” conversion 1059 WHP/944 WTQ, 9.48@150
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08-31-2023, 08:56 PM | #5 |
Drives: 2019 ZL1 Join Date: Oct 2020
Location: Colorado Springs
Posts: 164
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Not sure on where its at in the travel range. I know prior we had it in the 50-60% range per magnusons suggestion with the 8 rib. Just slightly concerned because when they tested it today my friend said it made 12 pounds...the goal with this switch to was to make about the same amount of boost or a tad more with no slip. I also know DA was like 11-12k today so I'm not sure how much extra that effects it. The last day we tested with a log it was like 10k DA and we had 15 pounds of boost before falling off to 11 because of slip.
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08-31-2023, 09:04 PM | #6 | |
Drives: 2017 Camaro 2SS A8 Join Date: Aug 2018
Location: Petersham MA
Posts: 4,760
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Quote:
__________________
2017 Chevy Camaro 2SS A8 Whipple 3.0, Mast Black Label heads, Fore triple in-tank pumps, 112mm TB, LPE +52% injectors, LPE BB HPFP, 15” conversion 1059 WHP/944 WTQ, 9.48@150
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08-31-2023, 09:29 PM | #7 |
Drives: 2019 ZL1 Join Date: Oct 2020
Location: Colorado Springs
Posts: 164
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08-31-2023, 09:44 PM | #8 |
Drives: 2022 Lt1 A10 Join Date: Nov 2015
Location: clark, mo
Posts: 8,860
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I have the THPSI 10 RIB with 9.25 lower and 95mm Griptech upper and mine makes 11 to 11.5 so I'd say your in that 12 to 13 psi area. Did your friend log your car on the dyno? Most of the logs are based on Kpa. So my Kpa on the logs from the track range from 175 to 180 on the Kpa.
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2022 Lt1 6.2 A10, Maggie 2300, THPSI Port Inj/10 rib, Rotofab, E, Nickey, SCOL, Griptech, RC Bandits, Hoosiers/MT 9.80@142.96 1.44 60ft, 6.34@112 707/669 RWHP/TRQ. 16SS Maggie 2650 9.41@147 1.35 60ft, 5.99@119. 16 C7 A8 10.90@128 Bolt on stuff
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08-31-2023, 09:57 PM | #9 | |
Drives: 2017 Camaro 2SS A8 Join Date: Aug 2018
Location: Petersham MA
Posts: 4,760
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Quote:
__________________
2017 Chevy Camaro 2SS A8 Whipple 3.0, Mast Black Label heads, Fore triple in-tank pumps, 112mm TB, LPE +52% injectors, LPE BB HPFP, 15” conversion 1059 WHP/944 WTQ, 9.48@150
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08-31-2023, 10:00 PM | #10 |
Drives: 2017 Camaro 2SS A8 Join Date: Aug 2018
Location: Petersham MA
Posts: 4,760
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Mike Sitar (TooHighPSI) told me that if you can barely get the new belt on, that’s perfect…! And he was right. I did that and after running the car for a little bit I noticed the tensioner came down off max tension very quickly. I’m probably 75% tight right now and don’t seem to have any slip (9.25/3.25).
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2017 Chevy Camaro 2SS A8 Whipple 3.0, Mast Black Label heads, Fore triple in-tank pumps, 112mm TB, LPE +52% injectors, LPE BB HPFP, 15” conversion 1059 WHP/944 WTQ, 9.48@150
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08-31-2023, 10:06 PM | #11 | |
Drives: 2019 ZL1 Join Date: Oct 2020
Location: Colorado Springs
Posts: 164
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08-31-2023, 10:08 PM | #12 | |
Drives: 2019 ZL1 Join Date: Oct 2020
Location: Colorado Springs
Posts: 164
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Quote:
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09-01-2023, 02:49 PM | #13 |
Drives: 2019 ZL1 Join Date: Oct 2020
Location: Colorado Springs
Posts: 164
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Update. Made 17.4lbs @87 degrees outside in this crazy high DA. Belt started fray. Issue is belt length had to be a 12 rib with 2 ribs cut off. They think there was an error in their cutting so they're ordering a special cutting tool and new belts to make it work per THP advice. And finally, no slip on the log. So that's definitely progress!
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09-01-2023, 02:55 PM | #14 | |
Drives: '20 ZLE Join Date: Jun 2020
Location: Mile High
Posts: 3,562
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'20 ZL1 1LE A10,
OEM short block, LME heads/valve train, E2650. 100+ octanes, no eth, no meth, no N2O. 2/23 - 1031/1004 wheel. 4/23 - 1.41/9.61/145 at DA 7000 ft. (only made five passes). 2/24 - LME 390, E2650, FBO, 100 oct.; 1116hp/ 1063tq; 109 oct. dyno next. |
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Tags |
boost, lower pulley, pulley, supercharger, upper pulley |
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