2013 ZL1 with LT headers and a pulley, it needs a fuel pump - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

sbelyo · 06-08-2023, 01:16 PM

A few weeks back I picked up a 2013 ZL1 Auto with 60K miles on it. It has a 2.5" pulley, long tubes, we think no cats, 3 inch exhaust with X pipe all the way back to stock mufflers. I took it to a tuner here in Ocala FL with a good rep so he could take a look at it to make sure it was safe to drive it and get on it it etc etc without breaking it.. He put his laptop on it and took it for a drive. He said that its got good power but noticed that torque management was missing on the downshifts and that would kill the trans if left that way. He also said that the injector duty cycle hit 126% and this leaned out the motor with some detonation on the top end. He recommended replacing the stock fuel pump to fix the duty cycle issue. He mentioned that the stock fuel pump and injectors should be just fine with the mods that are on the car and that he's seen this before and fixed it by replacing the fuel pump. I agreed so I had him order the pump and will let them do the install along with replacing the rear mag ride shocks and a proper tune.

Is there anything else I should do?

bsn · 06-08-2023, 04:30 PM

That's about 18% overdrive, I would think you would need a stock fuel pump + boost a pump or aux pump + bigger injectors to be safe.

FASTFATBOY · 06-08-2023, 07:07 PM

Mine makes 600 wheel with a stick shift and the stock pump has no issues.

2.4 pulley
Ported throttle body
No cats
Intake
ID 1000 injectors.

Sounds to me like you need injectors, not a pump. Stock injectors are done at about 540 wheel. If your tuner does not know that you need a new tuner.

sbelyo · 06-08-2023, 08:50 PM

Quote:

Originally Posted by bsn

That's about 18% overdrive, I would think you would need a stock fuel pump + boost a pump or aux pump + bigger injectors to be safe.

I found an online tool that shows it adds about 10%. I should add that the lower pulley is stock

sbelyo · 06-08-2023, 08:52 PM

Quote:

Originally Posted by FASTFATBOY

Sounds to me like you need injectors, not a pump.

I thought about this after I left as well. I'll do some more research

FASTFATBOY · 06-09-2023, 05:47 AM

Quote:

Originally Posted by sbelyo

I thought about this after I left as well. I'll do some more research

Get a new tuner, that guy will blow your shit up.

Call Janetty, he'll get you fixed up.

sbelyo · 06-09-2023, 12:31 PM

Quote:

Originally Posted by FASTFATBOY

Get a new tuner, that guy will blow your shit up.

Call Janetty, he'll get you fixed up.

Noted... I'm in contact with jeremy from fasterproms. Lets see where this goes

sbelyo · 06-09-2023, 02:51 PM

In order to keep this sane I feel like I should go up to a 2.75" pulley. I have an ADM hub.
https://lsa-conversion-store.myshopi...version-pulley

I believe the stock belt size should fit but there's no chart that shows a 2.75 upper and stock lower. I did find a gates HD belt that is 3/16" shorter than stock so I think this should fit
https://www.gates.com/us/en/power-tr...555-00224.html

This combo will lower the boost to help keep the motor safe correct?

Lastly I found my HPtuners MPVI2 with 2 credits unused. Can I use this to log data to see what the injector duty cycle and fuel pressure are?

roh · 06-09-2023, 04:44 PM

I bought a car with a very similar combination as you, except the 3".
I log with HP tuners & just checked a 1/4 mile pass. My highest injector duty cycle was 51٪. Fuel pressure was about 65lbs.

I don't know whats in the tank, but no boost a pump or aux pump. Injectors appear stock.

tartagliazl1 · 06-09-2023, 06:12 PM

Quote:

Originally Posted by sbelyo

In order to keep this sane I feel like I should go up to a 2.75" pulley. I have an ADM hub.
https://lsa-conversion-store.myshopi...version-pulley

I believe the stock belt size should fit but there's no chart that shows a 2.75 upper and stock lower. I did find a gates HD belt that is 3/16" shorter than stock so I think this should fit
https://www.gates.com/us/en/power-tr...555-00224.html

This combo will lower the boost to help keep the motor safe correct?

Lastly I found my HPtuners MPVI2 with 2 credits unused. Can I use this to log data to see what the injector duty cycle and fuel pressure are?

All you need is a aeroforce gauge it will scan all the parameters for you.

bsn · 06-09-2023, 07:16 PM

Yes you will need to use both credits but HP tuners will log your injector duty. you really need don't want to get above 80% duty.

sbelyo · 06-09-2023, 07:41 PM

Quote:

Originally Posted by roh

I bought a car with a very similar combination as you, except the 3".
I log with HP tuners & just checked a 1/4 mile pass. My highest injector duty cycle was 51٪. Fuel pressure was about 65lbs.

I don't know whats in the tank, but no boost a pump or aux pump. Injectors appear stock.

That's interesting, it almost lends some truth to what the tuner was saying. Do you have a 2.5" pulley or larger?

sbelyo · 06-09-2023, 07:44 PM

Quote:

Originally Posted by tartagliazl1

All you need is a aeroforce gauge it will scan all the parameters for you.

That's really cool
https://aeroforcetech.com/collection...et-camaro-2010

Risingson05 · 06-09-2023, 10:18 PM

I really like my aeroforce gauge ..

06-08-2023, 01:16 PM	#1
sbelyo Drives: n/a Join Date: Jan 2015 Location: United States Posts: 67	2013 ZL1 with LT headers and a pulley, it needs a fuel pump A few weeks back I picked up a 2013 ZL1 Auto with 60K miles on it. It has a 2.5" pulley, long tubes, we think no cats, 3 inch exhaust with X pipe all the way back to stock mufflers. I took it to a tuner here in Ocala FL with a good rep so he could take a look at it to make sure it was safe to drive it and get on it it etc etc without breaking it.. He put his laptop on it and took it for a drive. He said that its got good power but noticed that torque management was missing on the downshifts and that would kill the trans if left that way. He also said that the injector duty cycle hit 126% and this leaned out the motor with some detonation on the top end. He recommended replacing the stock fuel pump to fix the duty cycle issue. He mentioned that the stock fuel pump and injectors should be just fine with the mods that are on the car and that he's seen this before and fixed it by replacing the fuel pump. I agreed so I had him order the pump and will let them do the install along with replacing the rear mag ride shocks and a proper tune. Is there anything else I should do?

06-08-2023, 07:07 PM	#3
FASTFATBOY Drives: 2013 ZL1 Join Date: Nov 2018 Location: Mobile Al Posts: 302	Mine makes 600 wheel with a stick shift and the stock pump has no issues. 2.4 pulley Ported throttle body No cats Intake ID 1000 injectors. Sounds to me like you need injectors, not a pump. Stock injectors are done at about 540 wheel. If your tuner does not know that you need a new tuner. __________________ 2013 ZL1 M6, 2.4 pulley and a few bolt ons. 590 wheel and 11.70@122 on a hard tire.

06-09-2023, 10:18 PM	#14
Risingson05 Drives: 2015 zl1 m6 Join Date: Jan 2020 Location: Alaska Posts: 702	I really like my aeroforce gauge .. __________________ 791whp 699 ft lbs torque on E30 - ported sc /heads by boost mode racing - PAT G cam /Tune PB:10.7 @133.9

06-08-2023, 04:30 PM	#2
bsn Drives: 2013 ZL1 Join Date: Sep 2021 Location: Virginia Posts: 316	That's about 18% overdrive, I would think you would need a stock fuel pump + boost a pump or aux pump + bigger injectors to be safe.

06-09-2023, 02:51 PM	#8
sbelyo Drives: n/a Join Date: Jan 2015 Location: United States Posts: 67	In order to keep this sane I feel like I should go up to a 2.75" pulley. I have an ADM hub. https://lsa-conversion-store.myshopi...version-pulley I believe the stock belt size should fit but there's no chart that shows a 2.75 upper and stock lower. I did find a gates HD belt that is 3/16" shorter than stock so I think this should fit https://www.gates.com/us/en/power-tr...555-00224.html This combo will lower the boost to help keep the motor safe correct? Lastly I found my HPtuners MPVI2 with 2 credits unused. Can I use this to log data to see what the injector duty cycle and fuel pressure are?

06-09-2023, 04:44 PM	#9
roh Drives: 2013 ZL1 Join Date: Nov 2015 Location: Northeast Posts: 72	I bought a car with a very similar combination as you, except the 3". I log with HP tuners & just checked a 1/4 mile pass. My highest injector duty cycle was 51٪. Fuel pressure was about 65lbs. I don't know whats in the tank, but no boost a pump or aux pump. Injectors appear stock.

06-09-2023, 07:16 PM	#11
bsn Drives: 2013 ZL1 Join Date: Sep 2021 Location: Virginia Posts: 316	Yes you will need to use both credits but HP tuners will log your injector duty. you really need don't want to get above 80% duty.