EFR Internal Waste-Gate Discussion

[C. Ludwig]

Jacob, did you guys use the inductive pickup or roller speed for your RPM source? Also, was the ramp rate the same for each turbo?

[jacobcartmill]

Ludwig, we were using the roller speed for RPM. in retrospect, i should have used the ignition pickup, but it is pretty close. my rev limiter is set at 7400, which is pretty close to where it cuts off on the graph.

and yes, i made sure the ramp rate was 160 for both turbo setups. (i went to a different dyno shop, so i had to use the ramp rate that the previous shop used to keep them the same).


also, i am just noticing how strange the dyno graph looks because the axes for torque and HP were different. i am going to check and see if i can get a graph with the same axes.

[C. Ludwig]

I figured you used roller speed.. Looks like the RPM isn't synched quite right between the two. Hard to do when using the rollers. Looks to me that you picked uo peak boost closer to 1200 rpm sooner rather than 1500. Still VERY impressive.

[jacobcartmill]

Originally Posted by C. Ludwig

I figured you used roller speed.. Looks like the RPM isn't synched quite right between the two. Hard to do when using the rollers. Looks to me that you picked uo peak boost closer to 1200 rpm sooner rather than 1500. Still VERY impressive.

i see what you mean. so there's a ~300rpm discrepancy between the two graphs.

also, i can post some logs if you care to check them out and give any general input

[C. Ludwig]

Yes. Whoever mentioned the BW graph falling off and Elliot saying the hotside on the BW was bigger got me interested. The peaks of each graph are the same. The RPM scale is just shifted.

I'd love to see data. Also, if Elliot will weld the bungs in your manifold, I'll loan you a Haltech EGT box and sensors.

[jacobcartmill]

Originally Posted by PSI

... Looking at how much earlier and how sharply power falls over with the EFR you'd have to assume something is choking?
It would be interesting to see what the compressor could do at 22psi where it's right in it's efficiency range.

maybe you are looking at the wrong axis? everything about the EFR is earlier, better, and higher, until you get to the peak, which is the same as the 6262 setup. the scales are just different.

[jacobcartmill]

here's a graph with the axes matching the dyno from the 6262 setup:

[jacobcartmill]

ludwig, i emailed you.