[2018zl1-1le]

I’m getting the BTR STAGE 2 cam installed and e85 sensor and dsx in tank pump
I have a 9.25 lower 2” headers high Flo green cats and full kooks exhaust and a 103/107mm throttle body and big gulp. My question is how much E can I expect to be able to run and maybe a guess on power I’ll be at.
Any thoughts would help just curious

[ZLRob]

You will need injectors and you will be best suited running a Goliath to maximize E delivery. Otherwise you will be capped at around 750 RWHP. That cam is capable of supporting around 800-830 if I remember right.

You will be down on power if you don't do injectors. You will want the extra headroom of the HPFP as well.

[Megahurtz]

Not a lot because you will be out of injector spray window on stock injectors. The stock LT4 high side pump is plenty to drive XDI 30's s with a fuel lobe on the cam. The DSX will feed plenty of low side. Pick up some XDI 30's and run E50-E60 for max power on the street.

I'd estimate you will get about E20-E30ish out of it with the stock injectors.

[ZLRob]

Originally Posted by Megahurtz

Not a lot because you will be out of injector spray window on stock injectors. The stock LT4 high side pump is plenty to drive XDI 30's s with a fuel lobe on the cam. The DSX will feed plenty of low side. Pick up some XDI 30's and run E50-E60 for max power on the street.

I'd estimate you will get about E20-E30ish out of it with the stock injectors.

Right, yeah, which at that point you might as well run 91/93 because there's no point in blending for E content that low as it won't give you enough benefit to get the cooling properties from it.

Stock LT4 pump is good up to 850 if I remember right, so he won't have a lot of margin of leeway left for high side if he wants to add any other power adders. If he had it all out, which he will, he might as well upgrade it and get it done with that way he can get that extra 10%-- 12% high side capability right? At least that's my line of thinking.

[Revalot]

Originally Posted by 2018zl1-1le

I’m getting the BTR STAGE 2 cam installed and e85 sensor and dsx in tank pump
I have a 9.25 lower 2” headers high Flo green cats and full kooks exhaust and a 103/107mm throttle body and big gulp. My question is how much E can I expect to be able to run and maybe a guess on power I’ll be at.
Any thoughts would help just curious

Stock or aftermarket oil pump going in or done already?

[Megahurtz]

Originally Posted by ZLRob

Right, yeah, which at that point you might as well run 91/93 because there's no point in blending for E content that low as it won't give you enough benefit to get the cooling properties from it.

Stock LT4 pump is good up to 850 if I remember right, so he won't have a lot of margin of leeway left for high side if he wants to add any other power adders. If he had it all out, which he will, he might as well upgrade it and get it done with that way he can get that extra 10%-- 12% high side capability right? At least that's my line of thinking.

The stock pump will drive the XDI 30's to max if using a 32% fuel lobe on the cam. Unless he plans on going larger than 30% injectors, there really isn't a reason to upgrade the LT4 high side pump.

Technically, I would go with a Goliath pump and XDI 50's and run E60 if its a street car. There is no reason to run more than E50-E60 unless you have a built motor that is setup to require very high Ethanol percentages. Or if you don't want to blend at the pump. But on a stock bottom end and stock max ported blower on the street, you aren't going to go any faster running more than E60. I mean MAYYYBEEEEE once the blower is hot at the top of a long pull, E70+ would be more knock resistant but I haven't found it to be the case on the street where you're not tuned on the very edge.

[SOCAL.M6.ZLE]

Originally Posted by Megahurtz

The stock pump will drive the XDI 30's to max if using a 32% fuel lobe on the cam. Unless he plans on going larger than 30% injectors, there really isn't a reason to upgrade the LT4 high side pump.

Technically, I would go with a Goliath pump and XDI 50's and run E60 if its a street car. There is no reason to run more than E50-E60 unless you have a built motor that is setup to require very high Ethanol percentages. Or if you don't want to blend at the pump. But on a stock bottom end and stock max ported blower on the street, you aren't going to go any faster running more than E60. I mean MAYYYBEEEEE once the blower is hot at the top of a long pull, E70+ would be more knock resistant but I haven't found it to be the case on the street where you're not tuned on the very edge.

Could not agree more. to the OP, I maxed out my injectors around d 735rwhp on E30... Maxed out my HPFP around 840rwhp on E60... Just installed THIS bundle that includes XDI 50's and an XDI Goliath so that I can run straight E and perhaps hit 900whp? Will know later next month. Happy to help set you up on parts of you need it.

Also, like others mentioned, please confirm you are installing a Katech oil pump? and upgraded lifters / valve train? Several other items you'll want to address to keep things reliable.

[KingLT1]

You might want to consider bumping the converter up to around 3-3200. The stage 2 BTR is right on the edge with a stock converter. Yes I know plenty run that cam with a stock converter, I have tuned a few of them but it's not ideal imo. The stage 1 is better with a stock converter.

[SammYyYyY]

Originally Posted by KingLT1

You might want to consider bumping the converter up to around 3-3200. The stage 2 BTR is right on the edge with a stock converter. Yes I know plenty run that cam with a stock converter, I have tuned a few of them but it's not ideal imo. The stage 1 is better with a stock converter.

He should be a 6MT as he's an 18 ZLE, so he should be good to go there!

[KingLT1]

Originally Posted by SammYyYyY

He should be a 6MT as he's an 18 ZLE, so he should be good to go there!

Agreed!

[SammYyYyY]

Originally Posted by Megahurtz

Not a lot because you will be out of injector spray window on stock injectors. The stock LT4 high side pump is plenty to drive XDI 30's s with a fuel lobe on the cam. The DSX will feed plenty of low side. Pick up some XDI 30's and run E50-E60 for max power on the street.

I'd estimate you will get about E20-E30ish out of it with the stock injectors.

This is something that has confused me massively. I have heard the same as you from several people, but my brother bought a cam/ported blower car out of California that was tuned by Ryne Cunningham. His car made 760 WHP on full E85 with a completely stock high-side, DSX aux, and a custom grind cam (similar to a BTR stage 2 intake/exhaust duration, I believe it's either a 36% or 38% HPFP lobe), and Ryne said they weren't even out of fuel yet. That car has been run exclusively on E85 for the past 6 years and 20k miles, and has seen an unreal amount of track days. Car has been on a number of dynos too, so we have confirmed that it wasn't just a high-reading dyno (and honestly the power numbers make sense given the mods; cam, ported blower, 15% lower, DSX, flex, and a ton of cooling mods).

My tuner concurred that the LT4 high side is plenty for full E85 up to that power level. What am I missing here?

[RobZL1]

Originally Posted by SammYyYyY

This is something that has confused me massively. I have heard the same as you from several people, but my brother bought a cam/ported blower car out of California that was tuned by Ryne Cunningham. His car made 760 WHP on full E85 with a completely stock high-side, DSX aux, and a custom grind cam (similar to a BTR stage 2 intake/exhaust duration, I believe it's either a 36% or 38% HPFP lobe), and Ryne said they weren't even out of fuel yet. That car has been run exclusively on E85 for the past 6 years and 20k miles, and has seen an unreal amount of track days. Car has been on a number of dynos too, so we have confirmed that it wasn't just a high-reading dyno (and honestly the power numbers make sense given the mods; cam, ported blower, 15% lower, DSX, flex, and a ton of cooling mods).

My tuner concurred that the LT4 high side is plenty for full E85 up to that power level. What am I missing here?

I dunno. But your brother's car must have the injector open from 420 degrees down to 120 degrees.

[KingLT1]

Originally Posted by SammYyYyY

This is something that has confused me massively. I have heard the same as you from several people, but my brother bought a cam/ported blower car out of California that was tuned by Ryne Cunningham. His car made 760 WHP on full E85 with a completely stock high-side, DSX aux, and a custom grind cam (similar to a BTR stage 2 intake/exhaust duration, I believe it's either a 36% or 38% HPFP lobe), and Ryne said they weren't even out of fuel yet. That car has been run exclusively on E85 for the past 6 years and 20k miles, and has seen an unreal amount of track days. Car has been on a number of dynos too, so we have confirmed that it wasn't just a high-reading dyno (and honestly the power numbers make sense given the mods; cam, ported blower, 15% lower, DSX, flex, and a ton of cooling mods).

My tuner concurred that the LT4 high side is plenty for full E85 up to that power level. What am I missing here?

Target AFR plays a huge part in that. Some tuners will run these cars really lean on E85...like .86-.88 lambda lean and that will stretch the fuel system out a lot further than .82-.84.

Then my next question would be...what does the car trap in the 1/4 mi and 60-130?

[Joshinator99]

Originally Posted by KingLT1

Target AFR plays a huge part in that. Some tuners will run these cars really lean on E85...like .86-.88 lambda lean and that will stretch the fuel system out a lot further than .82-.84.

This 100%. Not to mention guys that still have cats and Cat Over Temp gets shut off by the tuner… saves a ton of fuel headroom but nukes the cats. So the tuner gets to brag they did “XXX” HP on stock LT4 fueling but you get to buy new cats lmao