DanaT

That is a scary sentence to add.

DanaT

Is the 3000lbs with or without driver?

I am having a hard time wrapping my head around fuel flow (injector sizes). Where am I going wrong?

http://www.rceng.com/technical.aspx

If I use 0.65 for BSFC and then 60psi for fuel (rising rate from 3 bar so I assume 3 bar is BASE fuel pressure) then that shows a 425 hp engine needs 59lb injectors.

If I estimate your HP from 120mph quarter mile and given 3000lbs, that is about 425hp.

Using a BSFC of .65 that means 425*.65 = 255lb/hr fuel. Or 156 l/hr.

Where I am REALLY confused is I understand the need for more fuel. I made 355rwhp (uncorrected)on E85. I am using a stock fuel pump. How the hell did I ever flow 355 HP of fuel? Especially E85.

I think on my setup (80lb injectors) E85 am limited to about the 425hp level (59lb * 1.35 for E85).

If I go the meth injection route, I can probably make the same power but using normal gaoline.

tma. which kit did use or did you make your own. Aquamist seem like the "leader" but pricey. Then I have seen snow performance and devils own. Both look acceptable.

tman

3000 without me in it, extra fueling came from methanol.
I bought it as a kit, it came with the aquamist controller and the same pump everyone uses, hoses and injector. Company is no longer in business. At the time I was running a Lightning MAF, at redline on 28 psi voltage was very close to 5 volts at the MAF so 425 is probably close.

toddk911

The 90mm Lightning MAF? At 5v that maf is well over 500.

tman

Yes, the 90mm. I'm talking wheel hp.

toddk911

Ok gotcha.

Wow, 28psi is just about the record for 951 posted in here.

Was that boost just once in a while or did you run that much on a steady basis?

I have a kit that was supposed to be installed when ever all other problems were fixed so it has yet to be installed. Lol

I was planning on 22-23psi and maybe 25psi if the tune was spot on.

DanaT

tman.

With E85 what setup are you using? You about 35% on fuel?

tman

I ran 25 psi normally, only turned it up at the track.
I'm now running a Vitesse MAF and redid the fuel system and exhaust to keep up. And yes about 35% more on E85. I need to get a different turbo also and have really been thinking about doing Sid's stroker setup.

blown 944

The thing to take into consideration when using the lightning MAF is the size of pipe ahead of it. I was almost maxing it out with 3" and now I'm hitting 4.6v at 520whp with a 4" pipe feeding it. I know it's pretty darn accurate and im hoping the next time to get a full 5v. After that we will need to use an extender.

tman

I did not know that, I just had a filter attached to the maf. My cousin is a tuner at Diablosport, he mentioned I should get the Diablo Mafia extender when I still had the Lightning maf. I didn't think you were still running the Ford maf.

Rogue_Ant

Yep, not using the same diameter piping before and after the lightning MAF will change the way it reads (part of the problem with setting up a Tune for the Lightning MAF).

I.E. using 3" piping behind the MAF will direct more flow to the center of the MAF housing, causing the MAF to report a higher voltage than the equivalent airflow if using a 4" pipe.

BisimotoSales

Thought I would chime in regards to utilizing a water/meth kit, being that we have tuned several cars utilizing AEM Water/Meth units. With the lack of availability of E85 in many places, water/meth kits are a god send. Methanol injection is a great way to increase octane and cool down intake air charge gaining the ability to safely tune for higher boost pressures and more aggressive ignition timing. Not to mention, in high horse power vehicles, there will be no need to run an extravagant fuel pump and large injectors such as needed when utilizing E85.

piperporsche180944

Im running meth injection in my Vette and it loves it. We need to start using it with the Porsches

JBrown

This winter im going to meth my car i want 400 to 425rwhp so i need an extra 100 hp hoping the meth and 20psi of boost will get me close and changing my older LR MAF for the M tune.

toddk911

With meth 22-25psi is attainable.