Advice on Pulley Size

parbreak · 12-16-2019, 04:17 PM

Current Setup:

P1X 7 PSI
4.00" pulley
Stock fuel system
Stock cam

Conservative tune 545 RWHP

Mods in January:
LT4 HPFP
LT4 Injectors
Aux low side pump

Question: Can I go another pulley size down and if so to what? What would I expect for boost levels?

I KNOW every car/system is different. Looking for some general advice.

THANKS!

Dysan911 · 12-16-2019, 06:10 PM

I ran a 3.7 pulley on that setup plus a JMS Bap with no issues. 10 to 10.5lbs boost.

grampa_ss · 12-16-2019, 07:02 PM

I'm on the 3.9 and it's 8-9 lbs of boost. Thinking about going to the 3.7 to build boost a little quicker.

danhr · 12-16-2019, 09:21 PM

3.7 pulley. 10-11 psi. Lt4 low, high, injectors. Si Glenn meth nozzle. 760 rwhp

JANNETTYRACING · 12-17-2019, 07:15 AM

Quote:

Originally Posted by parbreak

Current Setup:

P1X 7 PSI
4.00" pulley
Stock fuel system
Stock cam

Conservative tune 545 RWHP

Mods in January:
LT4 HPFP
LT4 Injectors
Aux low side pump

Question: Can I go another pulley size down and if so to what? What would I expect for boost levels?

I KNOW every car/system is different. Looking for some general advice.

THANKS!

You can move to the 3.7 with fuel system upgrades, Long tube headers and a new custom tune

The ZL-1 in tank pump and JMS will do a great job at supplying fuel for up to 750 RWHP

Other Items I would suggest if you don't have them.

DSX Baro Break out harness and sensor.

3 bar map sensor.

NGK LTR6IX-11

MSD Wires

Kooks Long Tube headers with green cats.

Let me know If I can be of assistance in your quest for more power.

Ted.

pavetim · 06-30-2021, 08:09 AM

If you use a zl1 in tank and high side pump why would you need the JMP BAP?

JANNETTYRACING · 06-30-2021, 09:20 AM

Quote:

Originally Posted by pavetim

If you use a zl1 in tank and high side pump why would you need the JMP BAP?

Due to system voltage variations that strongly effect fuel pump flow.

They are on every car we build for a very good reason, I have talked about it at length, here, on facebook, and other forums.

Ted.

THASTIG · 06-30-2021, 10:57 AM

Depends on your elevation and what supporting mods you have. Im at 5-5200' running a D1SC 3.7" griptec pulley.. stage 2 intercooler, TSP long tubes and Borla atak "cat" back, MSD intake, NW 103mm throttle body, 91 with AEM meth kit 1000cc nozzle, LT4 fuel system..
Depending on the day im 11-12psi. Made 716whp and 683tq, you should be fine with that setup. Not sure what fuel options you have but we are very limited here in Reno NV and get shitty 91 which is why I added meth on top to help with the octane compensation. It doesn't hurt and is easy to setup in our cars, it would be the only other thing I would suggest to get on there. Im at 15* at WOT with zero knock across the full RPM range. Tuning plays a big role and we are lucky enough to have a pretty solid guy in town

12-16-2019, 04:17 PM	#1
parbreak Drives: 2017 50th Camaro SS Join Date: Jul 2016 Location: Maryland Posts: 525	Advice on Pulley Size Current Setup: P1X 7 PSI 4.00" pulley Stock fuel system Stock cam Conservative tune 545 RWHP Mods in January: LT4 HPFP LT4 Injectors Aux low side pump Question: Can I go another pulley size down and if so to what? What would I expect for boost levels? I KNOW every car/system is different. Looking for some general advice. THANKS! __________________ 50th Anniversary Edition \|Borla Atak and 60606 mid pipes\| Kooks 1 7/8" \| ProCharger Stage II \|305/45/17 DRs \| Circle D 3500 stall \| LT4 fueling \| Custom made Lowside Aux Pump \| Alky Control Meth \| DSX E85

12-16-2019, 06:10 PM	#2
Dysan911 Drives: 2017 50th Anniversary 2SS Join Date: Sep 2016 Location: Jacksonville, FL Posts: 930	I ran a 3.7 pulley on that setup plus a JMS Bap with no issues. 10 to 10.5lbs boost. __________________ Former Ride: 17 Camaro 2SS, M6 - Fifty \| Procharger P1SC \| 3.7 Pulley \| Stage 2 IC \| Race Bypass \| DSX FF Kit \| JRE Custom E85 Flex Fuel Tune \| LT4 Fuel System \| JMS Voltage Booster \| MSD Plug Wires \| American Racing 1-7/8's LT Headers Full System Catback \| Baro Breakout Harness \| LT4 Map Sensor \| Katech Ported TB \| MMS Oil Catch Can \| 160 Thermo \| Solo Performance J-Pipes

12-16-2019, 07:02 PM	#3
grampa_ss Drives: 2016 Camaro 2SS Join Date: Apr 2017 Location: Stansbury Park, Utah Posts: 1,092	I'm on the 3.9 and it's 8-9 lbs of boost. Thinking about going to the 3.7 to build boost a little quicker. __________________ 2016 2SS, MRC, NPP, A8. Procharger P-1X,Stage II,std bypass, 3.9, Alky Meth - 10.84 @129 - DA+2000 New Mods - GPI drop ins, Kooks 2", LT4 fueling, Cam, Circle D Converter, 3.5 pulley & dual nozzle meth.

12-16-2019, 09:21 PM	#4
danhr BAMF SS Drives: 2016 Camaro 1SS A8 Join Date: Mar 2010 Location: Ford City, PA Posts: 3,023	3.7 pulley. 10-11 psi. Lt4 low, high, injectors. Si Glenn meth nozzle. 760 rwhp __________________ 2016 1SS A8: FBO + Circle D + P1X + Meth + Tuned by Pray Performance Stock Longblock 800 SAE rwhp. 9.4 @ 145 mph.

06-30-2021, 08:09 AM	#6
pavetim Drives: firebird Join Date: Jan 2010 Location: valdosta, georgia Posts: 155	If you use a zl1 in tank and high side pump why would you need the JMP BAP?

06-30-2021, 10:57 AM	#8
THASTIG Drives: 17 SS 1LE Join Date: Feb 2021 Location: NV Posts: 34	Depends on your elevation and what supporting mods you have. Im at 5-5200' running a D1SC 3.7" griptec pulley.. stage 2 intercooler, TSP long tubes and Borla atak "cat" back, MSD intake, NW 103mm throttle body, 91 with AEM meth kit 1000cc nozzle, LT4 fuel system.. Depending on the day im 11-12psi. Made 716whp and 683tq, you should be fine with that setup. Not sure what fuel options you have but we are very limited here in Reno NV and get shitty 91 which is why I added meth on top to help with the octane compensation. It doesn't hurt and is easy to setup in our cars, it would be the only other thing I would suggest to get on there. Im at 15* at WOT with zero knock across the full RPM range. Tuning plays a big role and we are lucky enough to have a pretty solid guy in town

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