[PRAY]

NM, I see you said you had rail pressure.

[Drsagacity]

Originally Posted by L78toLT1

Hey Drsag, have you and Ted determined if your fuel system has enough headroom to run full e85 at 8-9 psi (85mm pulley)? I'm going to start out with the 85mm pulley for my street setup and would like to have the ability to pull up to any e85 pump and fill 'er up without having to monitor the ethanol content i.e. have enough margin to be ok in the unlikely event that I get a tank of 85%e

on the 85mm pulley I was running just over 700whp in 5th. All of my testing has been on straight pump e85...which has been between 70-79% ethanol. The 85mm pulley was great because I had that tuned for either e85 or 93 and could switch back and forth with no problems.

[Drsagacity]

Originally Posted by PRAY

NM, I see you said you had rail pressure.

fuel pressure was glued to 70lbs and the fuel rail pressure was in the 2800+range. The injector pulse width hit 7.1 on the runs I just did before the belt started slipping too bad. Makes looking at the results pretty tough because it's at 13psi to 5krpms and then slipping drops it to 9-10. Bottom line is, I need to get the smaller belt and give it another shot to see what it shows.


I have to get a smaller belt. I just tried to log some runs and since it's cooler...it's hard. In 4th gear at 50-70mph it just spins the tires. However, I ran one pull up higher and it started off with the boost and then dropped.

Smaller belt required before more testing.

[Drsagacity]

Originally Posted by MP3BOOSTED

You think the ported LT4 injectors would solve your problem if staying on e85? or would you rather stick to 93 octane and call it a day if driving the car on the street semi daily?!

I don't know about ported injectors. I looked at the FIC injectors which would solve the problem for about $3k.

At 12psi, on pump e85, my car is completely fine driving on the street with no problems.

We are bumping to 14-15psi to see if we can find the end of the fuel system and then we are going to do a race fuel tune for the track. The objective is to have 800+whp so that we can run a 9 second pass with a vert.

On the street I will dial it back based on the tires I am running. between 700-750whp (8-12psi).

[L78toLT1]

Originally Posted by Drsagacity

on the 85mm pulley I was running just over 700whp in 5th. All of my testing has been on straight pump e85...which has been between 70-79% ethanol. The 85mm pulley was great because I had that tuned for either e85 or 93 and could switch back and forth with no problems.

Great! It seems that your data supports the ability to run e85 and not worry about the %e. The differences between cars with identical mods does not appear to be insignificant though. I'll let Ted make the call once we start tuning.
You don't happen to have an extra 85mm pulley laying around, do you?

[Drsagacity]

Originally Posted by KingLT1

Good chance you will never see full 85% ethanol at the pump. It normally ranges from 65-80% unless you buy the high dollar C85 out of a Barrell.


93 octane will not work at this power level without meth. He will also lose power.

He would be better served to lower the boost and keep running E85 for the street. Switch to race gas with a different tune for track mode.

Exactly.

I like running on e85 where I can run lower boost levels and still have really crazy power. Running on straight pump e85, it's generally been around 70% ethanol. I can run 12psi on that setup with no mixing of fuels...

This last test is to see if 14-15psi finds the limit. We do know that with MS109, we will get into the 800's for whp. That would be my "track tune".

For the street, I would feel completely comfortable running the 8psi pulley (85mm) and running either 93 or e85. Above that, I would want to run e85 or I would need to add methanol.

With this setup, I am very confident we could run 93+Alky and run into the 8's. I just HATE the idea of using Alky injection for octane purposes so I am pushing to stay away from it if possible.

[Drsagacity]

Originally Posted by PRAY

I am not sure the injectors are the issue. What was the rail pressure and what does your injector timing look like?

In my experience the injectors are a reflection of rail pressure which is a reflection of the rest of the fuel system. I have not seen the injectors "go static" while I had rail pressure. The only time I see the injectors open up is when they detect a deficiency in the rest of the fuel system and try to open to compensate. I could be way out in left field though.

Fuel Pressure was 70psi and fuel rail was 2800+

The injector pulse width got up to about 7500 today when I tried a few more runs. Stopped and called it a day.

Now it’s time to either lower e% or go straight race fuel.

I may actually bag the effort and wait until after winter to keep testing. We won’t get a chance to run at the track anyway and I will just dial back to 8psi for the winter.

[Drsagacity]

Originally Posted by L78toLT1

Great! It seems that your data supports the ability to run e85 and not worry about the %e. The differences between cars with identical mods does not appear to be insignificant though. I'll let Ted make the call once we start tuning.
You don't happen to have an extra 85mm pulley laying around, do you?

Yes. I am very comfortable running straight pump e85 with no mixing between 8-12psi. I say that with the caveat that the station I always use is generally pump e70. I think when I tested the 8lb pulley (85mm) testing was actually done closer to e80. So, I would say that at that level, you have no worries and you will be in the 730whp range with the manual. (I was just over 705 with the auto).

That will depend on which pulley I settle on. The car is about to hit the garage for winter and will only be out on really sunny days. I am probably going to install the 85mm pulley for winter because I will still drive it occasionally and I definitely feel like that is the best setup for my current G2's.

You figure that pulley put me over 700whp (830HP to the crank). I think that's a nice number. I have been using the 760whp setup (900hp to the crank) for running pump e85 with no mixing and no problems.

[wnta1ss]

Originally Posted by aka Reckless

I made 830 rwhp on E70 with LT4 injectors and pump, stock in-tank, and DSX external fuel setup.

Didn't you also use a dual-nozzle methanol injection system?

[Drsagacity]

Originally Posted by aka Reckless

I made 830 rwhp on E70 with LT4 injectors and pump, stock in-tank, and DSX external fuel setup.

Few questions:
1. Were you running on m6 or A8?
2. How much boost were you running?
3. Were you running a custom cam?
4. Did you run with the Maggie or another blower?


I think we could have gotten to 800whp with 12 pounds of boost by advancing the timing a couple degrees and by locking the converter early. If you had those results on an M6 that would be the same as 830 whp. We were seeing an additional degree of timing on the street vs the dyno.

Thanks in advance for sharing.

If I am not seeing the fuel rail pressure or the fuel pressure dropping, I don’t know how the Aux pump could be making any difference.

[KingLT1]

He had a A8 with custom cam and ECS Novi 1500 blower.

[Drsagacity]

Originally Posted by KingLT1

He had a A8 with custom cam and ECS Novi 1500 blower.

In the A8, I would expect the 830whp at 15psi, but I assume they are running 26degrees of timing or so. I just don’t see how that can be safe given the fuel injector pulse width.

I don’t understand how e70 can get there with the Lt4 injectors. Based on my runs I see the fuel pressure and the rail pressure staying right where they need to be. Maybe e70 with a mix of e85 and MS109 vs my pump e70? If he was running alky too and reduced the need for fuel, that could make sense to me too.

I am not going to chase a specific dyno number. My objective was getting the car positioned to be the first vert to run 9’s. But we ran out of time to hit the track...unless we travel. Otherwise, we will wait until next year but with the current setup, I am sure we will get there. Only question is, can we get there with 12psi, or do I need 14?

[aka Reckless]

Sorry guys I was using a dual nozzle Alky Control set up. Vengeance Stage 2 cam, 12 psi with ECS kit (Paxton 1500).

[oldman]

as an aside, since we are talking about HP supported by mods. You all should be talking about uncorrected dyno HP... aka real HP. A SAE or even worst a STP Hp reading can be 40 HP higher.