No the fuel pump supplies fuel pressure and the injectors deliver/meter the fuel. Fuel pressure is running out before injectors it looks like. 1200's were at around 85 duty cycle and fuel pump maxed so tune goes lean and if not careful Boom!

Anyway certainly wouldn't hurt as I have 1200's and will see the limit of single Walbro 255 sometime next month

 

The single pump will max before the 1200's as I have tuned two RC1200's with single pumps on E85 in the last couple months and each have maxed out the single pump at 460-470whp on our mustang dyno.

I believe good wiring or a boost-a-pump and a FPR would give a little more head room. I'm trying for 490 with safety but I think it might be hard.

 

I was considering trying 2 gallons e85 to one gallon 91 to make 100 octane this would allow global to go up 10% (more headroom) although I realize the tune might have to be less aggressive also interesting proposition. the e70 to e85 blend is 15% difference and maybe 33percent 91 is too much to make the extra power so maybe a 15% or 20% blend. I used a fuel calculator to figure out octane. The trims could be dialed in pretty easily and I plan on doing this after I get my ordered fp red just to see

Here are some links to fuel octane blend calculators.

http://www.modularfords.com/forums/s...ad.php?t=20408

http://www.ranney.com/mjr/fuel_blend.html

 

problem is that Ethanol has a totally different burn rate andcylinder cooling than normal gasoline. You can't really use the octane calculators.

E85 tunes out more like 110 octane power wise, maybe even more.

 

I appreciate the feedback and lessons learned on the differences between the fuel pump and injectors. I don't want to take the chance of destroying my engine by pushing the fuel pump whatsoever. It looks like a slightly less-than-aggressive E85 tune might just do the trick. But, by going that route, does it lessen the excitement that the FP Red brings to the table on high boost? In other words, do you fellahs think that a FP Red on high boost (29 or so PSI) will be as "fun" as a FP Red with E85 on low boost (25 or so PSI)? Thanks.

 

How the Red is better then Green on pump gas ??? ON RACE GAS I AGREE ...

 

^^^what???....the red well still make more power than the green on pump

 

i agree....his (shacochis) numbers are on CBRD mustang dyno....no green on pump is gonna do those numbers on that dyno

 

Explain.

 

i can understand not needing to upgrade the valvetrain w/ these cams if u dont raise the rev. past 7k, but actually losing power w/upgraded components, that doesnt make sense to me

 

Zedevo if your quoting me saying my numbers are low and greens can make that on CBRD dyno your crazy....on this dyno camd VIII's barely see 300 on the dyno....it reads identical to BR dyno...

and keep in mind i had a stock IC at the time of the dyno....

 

and a very modest psi, correct???

 

I never quite understood the logic myself considering the title for the thread. And as far as the "not revving past 7k" is concerned, I'm not sure who doesn't pass that mark during spirited driving. I try to shoot for around the 7200 mark but at times it's more like 8000 hence the need for upgraded springs and retainers. The $400 or so is worth more than repairing a damaged engine. Enough of that... Back on topic...

 

stiffer springs require the engine to do more work to turn the already havier than stock cams. its that simple

 

With smaller turbos like these FP units you are beter off to use torque to pull you around. You don't need to rev the motor so much. They spool quick enough to make power early. They are more effecient at 7k than 8k too due to exhaust psi escalating up there. They are a good compromise between spool up and peak power. A very good street/strip combo. I hope this helps.
Todd