Refresh951's Hybrid Ultra Stroker Build
#811
My goals are a reliable, solid 400 rwhp with close to stock turbo response and much improved off boost performance. The turbo I have is more than capable, but I'd like a bit more low end grunt and the peace of mind from having a stronger, lighter rotating assembly. The other benefit I see is more efficient highway cruising because of the increased compression. This motor will be E85 fed.
http://www.modularfords.com/threads/...boost-pressure
#812
The 2.85 would easily hit what you want. However, the long stroke engine has proven to add quite a bit of extra torque off boost. Considering is a small difference in price in the grand scheme, I'd just start with it.
Btw, you can get decent mileage by fine tuning a "lean burn" cruise situation.
Btw, you can get decent mileage by fine tuning a "lean burn" cruise situation.
Last edited by Dougs951S; 07-17-2013 at 09:21 PM.
#813
Spent the last few days getting the tune on the car worked out. I feel really good about it. Rogue's Tuner/Logger has been an awesome tool in this process! I am running an MBC with stiff springs in the WG (1.1 bar) and have great boost control. The car feels great even with pulling 3 degrees of cam timing. Ready to hit the dyno tomorrow night. The plan is to get a 15 psi run, then a 18 psi run, and then if everything looks really good a 21 psi pull. The most important thing I am looking for is some complete baseline runs even if only at lower boost.
#814
Spent the last few days getting the tune on the car worked out. I feel really good about it. Rogue's Tuner/Logger has been an awesome tool in this process! I am running an MBC with stiff springs in the WG (1.1 bar) and have great boost control. The car feels great even with pulling 3 degrees of cam timing. Ready to hit the dyno tomorrow night. The plan is to get a 15 psi run, then a 18 psi run, and then if everything looks really good a 21 psi pull. The most important thing I am looking for is some complete baseline runs even if only at lower boost.
#816
#819
Ended up talking to a Aerospace Engineer with a PHD from Georgia Tech until really late after the dyno. Great discussion but dyno was once again challenging. I got a couple baseline runs that appear to be at about 12.5 and 14.5 psi. Early next week I am going to go back to the dyno for a two hour session. I will post the curve for these runs tonight as I had to leave early this morning for work. Definitely flattened out the torque curve up top.
#820
Glad to hear that you took the conservative route. Also glad you're doing a dedicated session.
At those boost levels, the tq curve should be pretty flat. You're not really pushing through your restrictions and VE limits.
Still curious about the low end change from cam timing and the overall power level at 14psi.
At those boost levels, the tq curve should be pretty flat. You're not really pushing through your restrictions and VE limits.
Still curious about the low end change from cam timing and the overall power level at 14psi.
#821
Been to the dyno a couple times in the last week working on the tuning. I now have boost under control and the motor has been solid with no real issues. Been looking at cam timing and ignition timing. I am getting closer but have a bit to go. Still not where I want to be on the top end. I will be focusing on the TB, the intake, and couple different cam grinds. Once I get the curve sorted I will be making much higher psi runs (20-24 psi). Thought I would post this dyno comparison between my 2.85L and the 3.12L, both runs at about 1 bar. This motor makes awesome bottom end and mid range torque! My main focus is to improve as much as possible the top end VE. I am suspecting the right cam is going to get me a long ways towards my goal.
#824
Interesting results, congrats.
Just goes on to show how long runners can't be beaten for mid range thrust!
By upgrading the cam without touching the intake it's possible that you will be adding mechanical stress at the top end to the point it may not yield worthwhile results given that a 3.xL engine moves quite a bit more air than a 2.5L.
I run the same 9R cam and the butt dyno suggests I've got a torque plateau from 4k to 7k, with a short runner intake. The car feels slower than with the stock intake because of less low and mid range thrust but acceleration times have shown the opposite to be true. This suggests to me my engine may be running quite efficiently. FWIW anyway.
Now that you have found a satisfying tune with the current engine components it would be interesting to note acceleration times from 60 to 100mph (in 3rd gear) between each time you replace components.
Just goes on to show how long runners can't be beaten for mid range thrust!
By upgrading the cam without touching the intake it's possible that you will be adding mechanical stress at the top end to the point it may not yield worthwhile results given that a 3.xL engine moves quite a bit more air than a 2.5L.
I run the same 9R cam and the butt dyno suggests I've got a torque plateau from 4k to 7k, with a short runner intake. The car feels slower than with the stock intake because of less low and mid range thrust but acceleration times have shown the opposite to be true. This suggests to me my engine may be running quite efficiently. FWIW anyway.
Now that you have found a satisfying tune with the current engine components it would be interesting to note acceleration times from 60 to 100mph (in 3rd gear) between each time you replace components.
#825
No satisfaction yet.