refresh951

Have a look at the charts I posted last week. Corleone kept making power all the way to 7K.

Paulyy

wouldn't having a longer stroke (7mm longer) have a difference in a torque curve? comparing to a larger bore (3mm) from yours to a standard 3L

Then again, Corleone did have a custom solid cam, solid lifters, custom head with custom waterports with his custom short runner intake.

refresh951

Definitely would no compare my results with Corleone. My point here is that Corleone kept making power to 7K. His mods are similar to many who did not keep making power past 6K. The big difference I think is his intake which was extremely short runner.

Paulyy

I believe his intake and cam are matched with each other quite well. I remember reading in a book i got a while back so i could learn more about cam timing and intakes and i saw a formula to use to make your runner lengths to match your cam.

refresh951

Bit more progress. On Saturday I got back to the dyno. Hit 480 rwhp. Amazingly I ran out of injectors with four 160 lb/hr injectors. Something is not right as this should not be happening. I am working on getting this sorted but thought I would share the progress.

Below is a comparison of the stock intake vs the short runner intake. Peak torque is essentially the same in the comparison. The stock intake run is at 21 psi and the short runner intake run is at 24 psi manifold plenum pressure. I believe the top of the intake valve is seeing essentially the same boost pressure at peak torque with my turbo compensating for the loss of dynamic charging because of the short runners. Pretty big difference past 5000 rpm and I get most of the mid range back.

On the 24 psi run I had zero knock. From 23 psi to 24 psi I picked up 13 hp. With the old intake from 20 to 21 psi I picked up only 8 hp. I was running pretty low fuel pressure (2.8 Bar) with the new injectors. Going to bump to 3.5 Bar and if my pump holds up I should cross the 500 rwhp mark on Thursday with another 1.5 psi.

Power is starting to roll off again as I push things higher. I am pretty sure this is due to the limitations of the head. My new 8V head configuration that uses data from my flow bench and from Sid should flow around 250 cfm and eventually I will have a much better cam also. This should allow me to utilize the new intake to its full potential.

V2Rocket

perhaps a 16v fuel rail would be a good option as they had 3.8bar FPR stock

Thom

When you look at your logs can you see an increase in engine acceleration between peak torque and peak power between both intakes?

Have you touched the ignition timing yet?

refresh951

I have an adjustable FPR. The stock intake is a square tube with 0.6" x 0.6" inside dimensions. Pretty large when compared to some aftermarket stuff.

Stock Intake: 5000-6200 rpm took 2.72 Seconds
Short Runner Intake: 5000-6200 rpm took 2.34 Seconds

Everything is the same between runs except the intakes and the use of the 5th injector. All maps are the same and cam timing is the same.

Thom

Excellent... This is I think a relevant performance indicator, as elapsed time is not plotted on dyno sheets.

Your curves above also show that, between peak torque rpm and peak power rpm (let's say 6k rpm), the torque drop off has decreased from ~69 ft.lbs to ~48 ft.lbs, which means an improvement in "flattening" the torque curve past peak torque rpm, thus increase peak power.

Pauerman

Do you think the check valve fitting on the inlet of the pump may be restricting flow. Based on the thread Eric made for his 044 pump, I wonder if the size of the orifice on the inlet adapter is playing a roll in starving you of fuel.

At my last Dyno session, I was also running very high injector duty passing the 440hp /tq range. I had initially suspected that my Walbro pump didn't have enough flow to support this power cause my 1000cc injectors should have enough room to make it. I plan on taking Eric's approach and will use an adapter with a larger ID to ensure more flow.

URG8RB8

Vic:

I spoke with Shawn and he drilled out the check valve per the LR tech instruction page.

Have you seen the new high flow pumps on the Five-O website? They have a massive flowing Walbro for Cheap money.

Pauerman

Eric,

The Walbro pumps on the Five-O site that are larger than 255 lph appear to in-tank options.

URG8RB8

Always read the fine print! Thanks, did not notice that.

refresh951

I think I will have to look at everything from the tank to the rail. I have read the stock fuel filter may be a restriction. Not many cars have run E85 at 500 hp. Patrick is but his fuel system probably cost more than my car.

Indeed I did. Sorry about the Gators Eric. I feel real bad (not really)

URG8RB8

You have no idea how upset I am, what a crappy weekend for me.