Bryan, my load numbers are no where near this low, would this by chance be running SD?

Also I'd like to see the mivec map on the 93 run if you don't mind sharing.

 

MAF and it's a Evo 8.

You're running almost 30psi aren't you?

This 93 log is basically 25psi across, 270 to 250 load.

 

Yeah, but I'm going to dial it down to 28 and taper to 25, maybe that will allow my afr's and timing to come in line and still pick up power.

My peak load is 340 at 30psi

 

You 100% sure you don't have a boost leak? Have you done a boost leak test?

Boost leak can make the car grumpy and sensitive.

 

No not 100%, but it sure is running great.

I usually can see my afr's dip richer than expected when i do have a boost leak, and can feel it.

Do you guys boost leak test to full boost, I normally only test to 20psi, due to the test coupler popping off

 

I test up to 30psi, which is what my tester maxes out at and the most I ever run. I've found a few, here and there over the 20psi mark.

 

The only thing I can think of that could possibly be leaking a large amount would be the bov.

I'll check when I have a bit of time.

 

Nice comparison between 71HTA and HTA Green. Which version of Green was it, in particular, did it have the older smaller turbine or the newer bigger turbine wheel?

I boost leak test to 35 psi. If couplers are done properly, they won't pop off.

 

I think you are on to something here. I have a similar setup, a few more mods and the same exhaust. Yes it's quiet, but all indicators for me are pointing to it being restrictive. About to get rid of mine and see what happens. There are no free lunches and a quiet exhaust almost always involves flow restriction in some form.

Of course mine is a racecar now so bring on the noise

 

I know i am late to the party, but i ran similar turbo's on my 2.4L on e85. While the low end response is very similar, we have completely different results @ 6k revs.. I am talking a difference of 70whp between the 2 turbos. This is @ 24ish psi as well.

I will post an overlay later.

 

I went the other direction. I do miss the instant push into the seat, especially around town. It was the most fun I've ever had in this car, not to mentioned it kicked *** at the local autox events (small, tight, 2nd-gear courses). Still, the turbo wasn't giving me the top end i needed at the track and I felt i was pushing it too hard. Some of our track days are 100*+ and I like running pump gas. In fact, pump gas numbers are the main reason I went to the green.
71 in "serious mode" vs the 73 on a nice, safe track tune. I could only imagine what the Green would do if i weren't held back by stock internals, a 6spd, and a 255 Wally.

 

So reading between your comparison and OPs, am I getting these conclusions right?

1. At ~25psi on pump the 71HTA gives up little up top and has significant gains at low RPMs (although you would imagine the Green tune is 'safer' for the track at this boost).

2. Kaj, your 67mm green turbine does give up a bit of boost threshold vs. OP's 65mm wheel.

3. The 71HTA is very optimized at this level but will give diminishing returns if the boost is turned up, while either Green has relatively significant room to grow.

 

Pretty much, yeah, you have the right idea.
For around town and autox, I prefer the 71, hands down. The car had so much "right now" power, it wasn't funny. And for the price? It's a no-brainer. I really want to buy another Evo as a daily and put one on it LOL. I'm trying to talk my GF into doing so.
Since my focus with my car is HPDE and Time Attack, I felt it okay to give up that lower threshold in order to have the turbo working less hard up top. The 71 can only do so much before it starts making a lot of heat, at the power level l needed. My goal was 400whp (with either type of fuel) and the Green does it easier with a gentler tune. I am excited to see what it does on pump gas, though.
I can see in the log and feel the difference in the higher RPMs between the two. The 71 was running out of steam pretty early and the green just keeps pulling; it just doesn't have that kick in the back at low RPM that the 71 does. I drove with both turbos within a week of each other, so the 71 was still fresh in my mind. The Green REALLY comes alive at 4k, though. It's like VTEC is kicking in.
If i weren't worried about back pressure, etc. I think the new FP54 will be a good compromise between the two, but results are still pending.

 

I agree, on paper the FP54 Green seems like a very good option for power in the 400-500whp range.

I am interested to see where it fits in, I imagine it will be some sort of a halfway-house on boost threshold but will make power up top just as well as the Greens with the larger turbines at moderate pressure ratios.

I am also very interested to overlay my in-progress 7163 setup with my old 71HTA results and throw that turbo in the mix

 

I actually wanted the FP54 and thought that's what I was getting. Oops. LOL. As it turns out, I think mine is better for my application. I think the 54 is a perfect turbo for those wanting a bit of extra "oomph" over the hta71.