8374

Pay no attention to the random smattering of parts. This is mid transition. Proper TID, shielding, etc to come later.

SO MUCH ROOM!

https://fbcdn-sphotos-c-a.akamaihd.n...64066787_n.jpg

https://scontent-b-ord.xx.fbcdn.net/...94448676_n.jpg

This isn't you car is it, Paul?

Nope. I've just got a rx8 with light mods for track use so I can get some HPDE under my belt.



This is my friend Jacob's who is in Nashville also. I did make the hard lines for the coolant tho! Stainless! :cool:

(Wastegate actuator had to be moved due to orientation)

https://scontent-a-ord.xx.fbcdn.net/...42733068_n.jpg

well i finally have some info on this:

i was driving the car with the catalytic converter installed, and the boost didn't go over ~10psi. it opened at ~6psi and seemed to creep to about 10 and not go over that in 3rd and 4th gear.

so, last night i swapped out the cat with the straight pipe, and the internal wastegate is getting overrun at peak torque. the boost shoots up quickly and uncontrollably at 5500rpms and hits my 13psi boost safety fuel cut. i am going out shortly to raise the boost cut to 17psi and see if the boost gets up that far.

i had the pre-load set at 6mm initially, and the boost shot up, so i unloaded it down to 2mm and it does the exact same thing.

we also tested the wastegate with my air compressor to verify that it's opening fully. here's a video:
Wastegate movement - YouTube



TL;DR EFR IWG not keeping up.

i did some GIMP'ing and overlayed two screenshots of the wastegate rod and arm fully open and fully shut, and it looks like the angles are within spec.

also used the measuring tool in GIMP to measure the wastegate arm angle.

wastegate arm is exactly as the borg warner installation manual says it should be at full stroke (~50 degrees), and of course the point of view isnt perfect, but it's close enough:

http://rotarycarclub.com/rotary_foru...2&d=1395513678

http://rotarycarclub.com/rotary_foru...3&d=1395513685

i just got back from some street testing with the low boost actuator set to very little preload (2mm). so the wastegate pressure is ~5psi, and it creeps up to about 15psi and stabilizes.

i used the haltech boost control to set the boost straight to 15, but i had to run 100% wastegate duty, so i'm going to replace the low boost canister with the original medium boost canister and preload it to run 15 psi and do some fine tuning with the boost control solenoid.

the turbo response is great. had 15psi by ~3300rpms, and this turbo is physically bigger (comp wheel, turbine wheel, and turbine A/R) than the previous Precision 6262 setup and has better response.


i am not happy that i can't run less than 15psi. i am going to see if i can do anything about it.

thats disappointing. do you have any pics of the wastegate ports? how big are they?

meh............. while I understand the frustration, 15psi is like the lowest boost ever anyway? you run that in 1st gear, then 20psi second, 30psi 3rd, 45psi onwards in 4th and back down to 30psi in 5th so you don't break the gearbox.

I am different though, 15psi is very low power setting regardless of porting type.

15psi by 3300rpm...Good info. Glad to see the larger frame still responds well with a short runner manifold.

hey guys, i did a little more tinkering and decided to swap out the wastegate actuators, swapping back to the "medium boost" actuator, and the overboost problem is completely fixed.

i have no idea why the problem existed with only the low boost actuator, but swapping it out completely fixed the problem.

and sorry, i've been on an emotional rollercoaster over this the last 2 days :)



so i dyno tuned today, and the short story is that this turbo is awesome. running the same boost as my previous 6262 setup, it made 12psi 1500rpms sooner, and made the exact same power. here are the graphs below (scales are different, and different software, but you can see the difference in response)

so the result was 338whp @ 12psi with very good boost response. enjoy the pics and videos.

https://scontent-a-ord.xx.fbcdn.net/...26541470_o.jpg

http://www.rx7club.com/attachments/b...me-jkdyno1-jpg


previous 6262 setup
http://www.rx7club.com/attachments/b...g-me-dyno2-jpg

previous 6262 setup boost response
http://www.rx7club.com/attachments/b...62response-jpg


new EFR 8374 setup
http://www.rx7club.com/attachments/b...g-me-dyno4-jpg

new EFR 8374 setup with power and boost plot (notice the boost is in ~1500 rpms SOONER)
http://www.rx7club.com/attachments/b...g-me-dyno6-jpg

hot exhaust :)
http://www.rx7club.com/attachments/b...urbloglow3-jpg



RX7 dyno, EFR 8374 IWG turbo, 338whp@12psi - YouTube

RX7 BW IWG EFR8374 dyno hot exhaust - YouTube

RX7 BW IWG EFR8374 In Car 2 of 2 - YouTube

the EFR made 30-40 less hp than the precision almost everywhere else than peak

edit: i think you were looking at the wrong axis.

3500rpm = 180hp/260tq on the 8374 > 110hp/170tq on the 6262

5640rpm = 300hp/280tq on the 8374 > 280hp/265tq on the 6262

did you mean to say more?

How many milliseconds do you have in your map in vacum to get it to throw flames like that? are you retarding the spark as well or just dumping in a shit load of fuel on heavy decel?

Looks good, all rotaries need to throw flames like that !

................................................

That bumper is going to melt! Awesome

oh snap my bad, awesome results. very interesting :icon_tup:

RICE, i am using the deceleration fuel-cut with a "fuel restore" value of 10% (which is a little too much) when going from decel to back on the throttle. there is also an ignition retard setting to go with this, which i think is at -5* retard (i will have to look again).

the fuel "restore" should probably be closer to 2-3%, but it's just so damn cool, and it may help to cool off the exhaust slightly (any input on this? i have heard this can have a slight cooling effect on the exhaust).

Great result! IWG is so much easier! What is the IWG area vs the original external WG area? 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.

Probably too rich and not enough advance up top based on video. The turbine wheel and a/r are even bigger than the PTE. We have many to Dyno including one to 30 psi in a few weeks..

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?

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.

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 :)

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.

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.

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

https://fbcdn-sphotos-g-a.akamaihd.n...50843906_n.jpg

http://www.rx7club.com/attachments/b...g-me-dyno2-jpg

ludwig, i emailed you.