HE351 code for me78569

[65fpvmustang]

So re cut mwe and made a threaded collar to make it adjustable. copping bullzie
http://www.bullseyepower.com/blog/World-s-First-Tunable-Race-Cover/62#.VpXjwlmID-V

[Rx7man]

Their stuff sure looks nice!  how does the MWE width affect it?  From my understanding the hot air it recirculates creates a boundary layer and reduces surge at high P/R's and low flows...  I haven't seen anything describing it much more than that.  On my truck I manage about 20PSI at 1500 RPM before i'm bordering the surge line

[65fpvmustang]

Do have a balancer at work but needs to be setup. my understanding is the parts are balanced separately.
This all just to get more boost power below 4k rpm. The 60mm he351 really flows alot more then i want.
enough to make 600hp I only want 400hp

[65fpvmustang]

The mwe slot can actually add flow and reduce surge but at a cost. At higher flows the exducer can actually suck more then the inducer can feed theslot adds flow here but recirculates air near surge. widening the map in both directions but efficiency is lost.
I surge at 14 psi boost at 3k would like to run closer to 20

[Rx7man]

hmmm.. interesting...

I really want my buddy to put a 351 on my old 3rd gen Rx7.. he's in the 500 hp area now with a T66-1 that comes online quite nicely around 3500 RPM.. it idles at 1800, and I think with the 351 he could get a couple PSI just off idle and get a really nicely driveable car.. it would also quiet it down at idle a little

[65fpvmustang]

saw a video of one on a 13b 12 psi boost blipping throttle in neutral.
i have mine setup so closed creates no ebp in cruise but cost me spool below 3000 rpm.
I get no boost blipping throttle all the way to 7k rpm.
On a 13b i would expect 20 psi at 3k running ebp 3psi over boost. Really just depends on surge line.
i get 5psi at 2500 with 7 psi ebp

[Rx7man]

I have my truck set up like your car... at cruise it opens up.. 70mph (4.10 gears), 2500 RPM, about 4 PSI boost and excellent mileage.  I implemented a tps rate adjustment that closes it up and holds it close for a while if you mash the throttle, it helps responsiveness when shifting gears by preventing it from going into a 'cruise' mode. 

[me78569]

did a run with the quad turned off, so just my 100 hp injectors.


max temp of 900*f and nearly smokeless.

[Rx7man]

Looks ok, but from a graph you really can't tell what it's like to drive.

I did some heavy hauling over the weekend, and found EGT's with this turbo take a long time to come up, and then they stay up... I have a compressor outlet temp gauge, and I found it directly linked to that.. So the compressor gets hot and heat soaks, and it takes a long time to warm up or cool down.. For short pulls you'll never see it get hot, but pull a mile long hill at 60mph and 6 ton behind the truck, and your EGT's will be 1300F.. I wasn't able to get above 1000F with no fuel plate without a load, when I was hauling that all changed

[me78569]

Honestly 1300*f with 6 tons and pulling a grade at 60 mph is pretty impressive.

I know that towing a 2 horse trailer up the pass, 3rd gear 45 mph, my egt's don't climb above 1100 with the quad turned off.  I am sure if I downshifted and tried to pull in OD it would climb to 1400-1500. 

It drives nice.  No smoke and no need to watch the gauge so far. 

[Rx7man]

I think the cam and head work I did help a lot with that. 

coming home last night (windy, hilly dirt road.. nearly logging road) again with 6 ton behind the truck, and the new version of my program, I was pretty impressed at the boost I was getting down low.. I was going up some hills in 4th, going down to 1300RPM, and rolling back onto it, my AFC starts fuelling at 15PSI, and that was no job to get.. usually 20 PSI @ 1400, 25 @ 1500, 30@1700,.. I do find I need more boost at peak torque, I'm going to go to 35 PSI.. I didn't have the overboost sensitivity very high, and turbo didn't seem to mind the 40 PSI I hit a few times, and it did help with EGT's.  Peak turbine speed was 117,000 RPM

[me78569]

Holset says 4.5 PR is fine so I can hit 40psi and have a pr of 4.52 at 7000'.  So long as I am below 125,000 rpm I don't even worry about it.   (11.34+40)/11.34 = 4.52  I have yet to see 40 psi, but I hover around 36-38 psi so I feel like I am at a good spot. 

The vgt can handle the 5.9 pretty easy.  I can see why the 6.7 has drive pressure issues, but I honestly run near to 1:1 above 25 psi.  I am not driving the turbo as hard as I could, but I like how the truck drives.

[Rx7man]

If only we had REAL compressor maps for holsets.. it's their BIG downfall.  I wonder how the maps look with the 64 and 67mm wheels?  I put a compressor inlet MAP sensor to detect air filter restrictions, etc as well as a barometric pressure sensor.. They won't be permanent, but it's kinda neat to see what's going on.

[me78569]

I really wish we had one too. 

I a just going off what holset says is true for a super hx40 ( I think) but the site said 4.5 pr and then there are a couple of maps that match the 130,000 rpm number. 

I would assume it is somewhat efficient up around 45 psi, but again without a map, who knows. 

[Rx7man]

Peak efficiency is probably around 30-35 PSI, depending of course on airflow, but it can handle more.