Where's the limit of stock fuel system with e85?

bobshannon22 · 07-16-2017, 10:45 AM

At FBO/E85 I had about 500rwhp. I'm adding heads/Cam and some other BS. At what point will the stock fuel system not be able to keep up with e85? My Cam has the +32 fuel lobe (TSP VVT-2)
In short, can stock fuel system be e85 for a H/C//I/FBO car?

Darth Martel · 07-17-2017, 05:43 AM

From my understanding, 575-600 is your ceiling.

bobshannon22 · 07-17-2017, 07:40 AM

So roughly the same for e85 and 93?

Darth Martel · 07-18-2017, 06:04 AM

fuel delivery is fuel delivery whether you're running e85, 93, or rocket fuel

DSX Tuning · 07-18-2017, 06:14 AM

Because of the need for more volume of fuel to make power on E85, you're probably going to be maxing the system out around where you'll sit. The bigger fuel lobe will help for sure, but you'll want to look into a low side pump upgrade. I'll have my low side kit available shortly.

bobshannon22 · 07-18-2017, 08:13 AM

I guess I'll find out. If I need one I'll go with you guys forsure!
If you need a test monkey I think my car would be perfect with the mods

PRAY · 07-18-2017, 11:05 AM

You can get a ZL1 in tank pump now as well. Drops right in. I will have to check the retail portion of my receipt but I am sure it is under $300. I would say that you should be able to get to 550-575rw with the lobe and the ZL1 on full E85. We just tried adding E85 to a C7Z we were doing. It makes 640/670rw on pump. We only go to E40 before we lost rail pressure and the car really didn't make any more power. That was on the stock Z fuel system with no cam lobe. I am sure the lobe and in tank pump will cover down on just about any stock displacement motor. Just remember that it takes 30% more E85 to make the same power as pump. That is why meth is so attractive.

Darth Martel · 07-18-2017, 11:18 AM

you can get a ZL1 in tank fuel pump for $162.50 (not including shipping if there is any)

thatGMpartsguy

bobshannon22 · 07-18-2017, 11:23 AM

How's the instal for the pump? Any write ups?
For that price where can I get one?

Thank you guys for the good info!

bobshannon22 · 07-18-2017, 01:30 PM

So after some research I have came to the conclusion that even if I'm short on fuel a LT4 pump wouldn't be the best choice. I guess the lash caps (needed for me +32 fuel lobe cam) can force the pump to basically sheer itself.
The vette guys have had plenty of issues with it, but only with LT4 pump, not LT1.

Hyperlinkblue · 07-19-2017, 09:27 PM

Quote:

Originally Posted by bobshannon22

So after some research I have came to the conclusion that even if I'm short on fuel a LT4 pump wouldn't be the best choice. I guess the lash caps (needed for me +32 fuel lobe cam) can force the pump to basically sheer itself.
The vette guys have had plenty of issues with it, but only with LT4 pump, not LT1.

You need to choose the correct lash cap. And also thats for the high preassure fuel pump, not the low preassure fuel pump, there refering to the low preassure fuel pump that is in the gas tank to supply the high presssre pump which sits under your intake manifold.

This will help on selecting the correct lash cap for the corespondig HPFP.

https://www.corvetteforum.com/forums...learances.html

Vrodviddy · 10-01-2019, 04:54 PM

Quote:

Originally Posted by Hyperlinkblue

You need to choose the correct lash cap. And also thats for the high preassure fuel pump, not the low preassure fuel pump, there refering to the low preassure fuel pump that is in the gas tank to supply the high presssre pump which sits under your intake manifold.

This will help on selecting the correct lash cap for the corespondig HPFP.

https://www.corvetteforum.com/forums...learances.html

This very true. Most cam kits include the .080 lash cap. This is way to big. Need to get the .060 and even then shave it down a bit. Any larger the .060 and your pump will sheer the bolts and fly right of the engine.

07-16-2017, 10:45 AM	#1
bobshannon22 Drives: 2016 camaro 1ss Join Date: Jan 2016 Location: virginia Posts: 92	Where's the limit of stock fuel system with e85? At FBO/E85 I had about 500rwhp. I'm adding heads/Cam and some other BS. At what point will the stock fuel system not be able to keep up with e85? My Cam has the +32 fuel lobe (TSP VVT-2) In short, can stock fuel system be e85 for a H/C//I/FBO car? __________________ 2016 1SS (M6) Kooks headers and exhaust, pray ported MSD/TB, JLT CAI, JLT catch can, TSP heads/VVT-2 cam, E85, Centerfirce clutch, g force axels and DS, most of what BMR makes, blah blah blah

07-17-2017, 05:43 AM	#2
Darth Martel Darth Martel Drives: Black 1SS with 20% tinted windows Join Date: May 2009 Location: Bizzaroland Posts: 1,495	From my understanding, 575-600 is your ceiling. __________________ 2016 Black 1SS w/ MRC, low-gloss black wheels, auto trans. Self-created custom Dark Knight Edition accents. Rotofab CAI with dry filter and sound tube delete, PRAY ported intake manifold and throttle body, Texas Speed cam, Stainless Works headers and exhaust, Skid Mark garage E85 kit, JMS fuel pump voltage booster, Circle D torque converter. Custom E85/mod tune by Jannetty Racing.

07-17-2017, 07:40 AM	#3
bobshannon22 Drives: 2016 camaro 1ss Join Date: Jan 2016 Location: virginia Posts: 92	So roughly the same for e85 and 93? __________________ 2016 1SS (M6) Kooks headers and exhaust, pray ported MSD/TB, JLT CAI, JLT catch can, TSP heads/VVT-2 cam, E85, Centerfirce clutch, g force axels and DS, most of what BMR makes, blah blah blah

07-18-2017, 06:04 AM	#4
Darth Martel Darth Martel Drives: Black 1SS with 20% tinted windows Join Date: May 2009 Location: Bizzaroland Posts: 1,495	fuel delivery is fuel delivery whether you're running e85, 93, or rocket fuel __________________ 2016 Black 1SS w/ MRC, low-gloss black wheels, auto trans. Self-created custom Dark Knight Edition accents. Rotofab CAI with dry filter and sound tube delete, PRAY ported intake manifold and throttle body, Texas Speed cam, Stainless Works headers and exhaust, Skid Mark garage E85 kit, JMS fuel pump voltage booster, Circle D torque converter. Custom E85/mod tune by Jannetty Racing.

07-18-2017, 08:13 AM	#6
bobshannon22 Drives: 2016 camaro 1ss Join Date: Jan 2016 Location: virginia Posts: 92	I guess I'll find out. If I need one I'll go with you guys forsure! If you need a test monkey I think my car would be perfect with the mods __________________ 2016 1SS (M6) Kooks headers and exhaust, pray ported MSD/TB, JLT CAI, JLT catch can, TSP heads/VVT-2 cam, E85, Centerfirce clutch, g force axels and DS, most of what BMR makes, blah blah blah

07-18-2017, 06:14 AM	#5
DSX Tuning Drives: 2019 Corvette ZR1 Join Date: May 2017 Location: St. Louis, MO Posts: 316	Because of the need for more volume of fuel to make power on E85, you're probably going to be maxing the system out around where you'll sit. The bigger fuel lobe will help for sure, but you'll want to look into a low side pump upgrade. I'll have my low side kit available shortly.

07-18-2017, 11:05 AM	#7
PRAY Drives: 2016 2SS Join Date: Jul 2016 Location: Sanford NC Posts: 2,766	You can get a ZL1 in tank pump now as well. Drops right in. I will have to check the retail portion of my receipt but I am sure it is under $300. I would say that you should be able to get to 550-575rw with the lobe and the ZL1 on full E85. We just tried adding E85 to a C7Z we were doing. It makes 640/670rw on pump. We only go to E40 before we lost rail pressure and the car really didn't make any more power. That was on the stock Z fuel system with no cam lobe. I am sure the lobe and in tank pump will cover down on just about any stock displacement motor. Just remember that it takes 30% more E85 to make the same power as pump. That is why meth is so attractive. __________________ 2016 2SS. H/C SBE 1.37 60ft, 6.36@109.49, 9.97@136+. Nuff Said.

07-18-2017, 11:18 AM	#8
Darth Martel Darth Martel Drives: Black 1SS with 20% tinted windows Join Date: May 2009 Location: Bizzaroland Posts: 1,495	you can get a ZL1 in tank fuel pump for $162.50 (not including shipping if there is any) thatGMpartsguy __________________ 2016 Black 1SS w/ MRC, low-gloss black wheels, auto trans. Self-created custom Dark Knight Edition accents. Rotofab CAI with dry filter and sound tube delete, PRAY ported intake manifold and throttle body, Texas Speed cam, Stainless Works headers and exhaust, Skid Mark garage E85 kit, JMS fuel pump voltage booster, Circle D torque converter. Custom E85/mod tune by Jannetty Racing.

07-18-2017, 11:23 AM	#9
bobshannon22 Drives: 2016 camaro 1ss Join Date: Jan 2016 Location: virginia Posts: 92	How's the instal for the pump? Any write ups? For that price where can I get one? Thank you guys for the good info! __________________ 2016 1SS (M6) Kooks headers and exhaust, pray ported MSD/TB, JLT CAI, JLT catch can, TSP heads/VVT-2 cam, E85, Centerfirce clutch, g force axels and DS, most of what BMR makes, blah blah blah

07-18-2017, 01:30 PM	#10
bobshannon22 Drives: 2016 camaro 1ss Join Date: Jan 2016 Location: virginia Posts: 92	So after some research I have came to the conclusion that even if I'm short on fuel a LT4 pump wouldn't be the best choice. I guess the lash caps (needed for me +32 fuel lobe cam) can force the pump to basically sheer itself. The vette guys have had plenty of issues with it, but only with LT4 pump, not LT1. __________________ 2016 1SS (M6) Kooks headers and exhaust, pray ported MSD/TB, JLT CAI, JLT catch can, TSP heads/VVT-2 cam, E85, Centerfirce clutch, g force axels and DS, most of what BMR makes, blah blah blah

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