Refresh951's Hybrid Ultra Stroker Build
#1351
Have a look at the charts I posted last week. Corleone kept making power all the way to 7K.
#1352
Then again, Corleone did have a custom solid cam, solid lifters, custom head with custom waterports with his custom short runner intake.
#1353
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.
Then again, Corleone did have a custom solid cam, solid lifters, custom head with custom waterports with his custom short runner intake.
#1354
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.
#1355
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.
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.
#1358
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.
#1359
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.
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.
#1360
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.
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.
Last edited by Pauerman; 04-06-2014 at 03:43 PM. Reason: quoted incorrect fitting
#1361
Drifting
Joined: Aug 2009
Posts: 2,239
Likes: 2
From: Bangkok, Thailand, Milpitas, CA & Weeki Wachee, FL
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.
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.
#1363
Drifting
Joined: Aug 2009
Posts: 2,239
Likes: 2
From: Bangkok, Thailand, Milpitas, CA & Weeki Wachee, FL
#1364
Indeed I did. Sorry about the Gators Eric. I feel real bad (not really)