[nicserrentino]

So my car is in the shop and the tuner/owner just told me they’re dealing with fuel pressure issues on e85. They said it’s apparently common and they’ve shimmed the high pressure pump in hopes to fix it. I have the dsx kit. Just want to get Inputs from you guys that have used this kit and if y’all ever dealt with this

[sr71bb]

Originally Posted by nicserrentino

So my car is in the shop and the tuner/owner just told me they’re dealing with fuel pressure issues on e85. They said it’s apparently common and they’ve shimmed the high pressure pump in hopes to fix it. I have the dsx kit. Just want to get Inputs from you guys that have used this kit and if y’all ever dealt with this

Well you need to feed the engine ABOUT 30% more fuel when using E85 vs. 93. Normally that is taken care of my modifying the fuel delivery tables so that it delivers more fuel to the engine if E85 is present vs. just gasoline. This assumes that you have enough fuel pressure and fuel volume to support whatever power level you have. For example your fuel pump might be able to support 550HP on GAS but MIGHT NOT be able to support that same power level on E85.

I run E85 on my daily driver 2019 SS 1LE and I get about 12MPG on E85 and around 15MPG on 93.

[Stephen12ZL1]

most cars can go to about e45-50 without any fuel pump changes...most choose to go with a voltage booster for the in tank low side pump instead of mods with the high pressure pump

[EDFHOBBIES]

Originally Posted by nicserrentino

So my car is in the shop and the tuner/owner just told me they’re dealing with fuel pressure issues on e85. They said it’s apparently common and they’ve shimmed the high pressure pump in hopes to fix it. I have the dsx kit. Just want to get Inputs from you guys that have used this kit and if y’all ever dealt with this

low side pump or booster, Headers, intake, and TB would be the limit of running pump e85 assuming pump e85 is around e50 to 60% Adding a pulley or porting and you will be in that 30 to 50% range.

id like to buy the 4 to 6 good piston and rods after the failure please.

[airtroop01]

Originally Posted by nicserrentino

So my car is in the shop and the tuner/owner just told me they’re dealing with fuel pressure issues on e85. They said it’s apparently common and they’ve shimmed the high pressure pump in hopes to fix it. I have the dsx kit. Just want to get Inputs from you guys that have used this kit and if y’all ever dealt with this

Not sure what shop is doing the work, but assuming they know what they’re doing, I had a similar issue and tons of fuel pressure issues. I ended up replacing the HPFP and still had the problem. Double checking every connection and everything altered underhood. Problem ended up being the feed line to the HPFP has an internal check valve which failed. You couldn’t tell from the outside of the line obviously since it looked new. Replaced the line and everything fired up and ran perfectly on the dyno afterwards.

[EDFHOBBIES]

Originally Posted by airtroop01

Not sure what shop is doing the work, but assuming they know what they’re doing, I had a similar issue and tons of fuel pressure issues. I ended up replacing the HPFP and still had the problem. Double checking every connection and everything altered underhood. Problem ended up being the feed line to the HPFP has an internal check valve which failed. You couldn’t tell from the outside of the line obviously since it looked new. Replaced the line and everything fired up and ran perfectly on the dyno afterwards.

Good point! LPE makes hiflow and I picked up 8 psi on lowside

[BlaqWhole]

This is why I don't mess with that crap. "Oh it's soo simple", "E85 is soo easy to deal with"...yea, and then you find out you can't run this you can't do that your max is 40 if you have this but 27 if you have that you need a low side you need a hp dfi tb3 4x 50hdmi with a pip29 controller on the high side if your pulley is blue...it's not worth the aggravation.

[Z OH 6]

Originally Posted by BlaqWhole

This is why I don't mess with that crap. "Oh it's soo simple", "E85 is soo easy to deal with"...yea, and then you find out you can't run this you can't do that your max is 40 if you have this but 27 if you have that you need a low side you need a hp dfi tb3 4x 50hdmi with a pip29 controller on the high side if your pulley is blue...it's not worth the aggravation.

E85 is certainly more challenging and expensive on the LT4 platform. It's cheap and easy on the Hellcat platform. That being said, it's hard to beat $2.50 race gas

[Joshinator99]

Originally Posted by BlaqWhole

This is why I don't mess with that crap. "Oh it's soo simple", "E85 is soo easy to deal with"...yea, and then you find out you can't run this you can't do that your max is 40 if you have this but 27 if you have that you need a low side you need a hp dfi tb3 4x 50hdmi with a pip29 controller on the high side if your pulley is blue...it's not worth the aggravation.

I have 90 more WHP on E50 (vs 93 octane) that would say otherwise…

[CW3SF]

Originally Posted by Joshinator99

I have 90 more WHP on E50 (vs 93 octane) that would say otherwise…

Same here. And I’ve never had a problem with it and never been confused by any aspect of it LOL.

[KingLT1]

GM LT stuff is by far the easiest platform to run Ethanol on with the flex fuel sensor. The ECU adjusts the tune on the fly for whatever percent Ethanol is in the system. All you have to do is log your car or have a dyno shop log the car and find out how much Ethanol the setup can run. Then you simply mix the E with Pump gas at the pump to stay around that percentage.

Most other platforms require being hard tuned for E which means if the Ethanol percent in the system changes then you have to manually adjust the Tune.

Either way feel free to stay on 93 and get gapped by cars with less mods on E...

[arpad_m]

Originally Posted by BlaqWhole

This is why I don't mess with that crap. "Oh it's soo simple", "E85 is soo easy to deal with"...yea, and then you find out you can't run this you can't do that your max is 40 if you have this but 27 if you have that you need a low side you need a hp dfi tb3 4x 50hdmi with a pip29 controller on the high side if your pulley is blue...it's not worth the aggravation.

There is no aggravation, you are reaching with these made up problems. You upgrade your fuel system (once) and get a tune that supports x% ethanol, and then you blend 93 and E85 to have less than x% ethanol in the tank each time.

If even this is too much, you upgrade your fuel system (once) with a tune for 85%+ ethanol, and then you can put any mix of 93 and E85 into the tank anytime, basically "fire and forget".

I can understand you personally don't want to mess with "that crap", but then just say that, no need to try and make it look worse than it is.

[Z OH 6]

Originally Posted by KingLT1

GM LT stuff is by far the easiest platform to run Ethanol on with the flex fuel sensor. The ECU adjusts the tune on the fly for whatever percent Ethanol is in the system. All you have to do is log your car or have a dyno shop log the car and find out how much Ethanol the setup can run. Then you simply mix the E with Pump gas at the pump to stay around that percentage.

Most other platforms require being hard tuned for E which means if the Ethanol percent in the system changes then you have to manually adjust the Tune.

Either way feel free to stay on 93 and get gapped by cars with less mods on E...

They have flex tunes on the Hellcat platform. The tune will automatically adjust based on the ethanol content that the factory wideband 02s read from the exhaust stream. No need to adjust the tune based on ethanol content. They also have flex fuel sensors too which works just like the LT platform, this is a newer method to adjust the tune, only a few tuners started going this route in the last 2 years. What makes it so much cheaper and easier on the Hellcat platform is that all you need is dual in tank fuel pumps, FIC 1200cc or ID1300x2 injectors and a flex tune and you're good to go to run full E85 well over 1000whp before some people will switch to 1700cc injectors. LT platform require so much additional fueling that it becomes very expensive quickly if you want to go over 700whp

[KingLT1]

Originally Posted by Z OH 6

They have flex tunes on the Hellcat platform. The tune will automatically adjust based on the ethanol content that the factory wideband 02s read from the exhaust stream. No need to adjust the tune based on ethanol content. They also have flex fuel sensors too which works just like the LT platform, this is a newer method to adjust the tune, only a few tuners started going this route in the last 2 years. What makes it so much cheaper and easier on the Hellcat platform is that all you need is dual in tank fuel pumps, FIC 1200cc or ID1300x2 injectors and a flex tune and you're good to go to run full E85 well over 1000whp before some people will switch to 1700cc injectors. LT platform require so much additional fueling that it becomes very expensive quickly if you want to go over 700whp

This is true if all you like to do is bench race dyno numbers. Fortunately there are other metrics that play a bigger roll in how a car performs. Power to weight ratio is one example.

Either way It's not like any of these cars are cheap to buy and most that can afford them can afford a few extra thousand on fueling if need be.