oh, I will also add that at this point we have maxed out my fuel system lines, I am running a -8 into dual -6s to the rail, at 38psi we begin to see fuel pressure NOT keeping up with boost. Base pressure is 43.5, at 30 psi we were right at 73.5 psi of FP, at 38 we were starting to see drop off and were only making 75.5 psi of FP. Still with in the tolerance level for proEFI to correct but not optimal to be sure. I'll be replacing the -8 with a -10 feed and splitting it into at least two -8s I may just run -10s the whole way on the feed side.

 

I would have never expected to see a 67mm turbo make over 800whp, and it is spooling faster then the 6765, I am very impressed.

 

honestly when I saw the dynos side by side, I was shocked... I think the results are a tiny bit inflated because of the temperature last night, it was in the 50s when we dynod, BUT when we dyno'd the 6765 right before the mile it was in the 70s, and my logs show AIT's with in 10 degrees of each other so perhaps not. at 15psi the car made 520whp, which was 30 more than the 6765 (spring pressure), and spool was similarly quicker even at that pressure. I would have expected the 6766 with the same AR to be faster, but never would I have guessed that with a 1.15 it would STILL Be faster, sorta messes up everything I thought I knew ;P

Edit: this is the dialed down number too - once we discovered the FP dropping we decided to back off a little, we were initially going to throw some e98 in the car, run 40psi and ramp the timing up a bit... We "settled" at 38psi with only a single degree of advance. I have no doubt I could make 850-900 on this turbo with some good rods and pistons... and it'd be an absolutely street raping machine.

 

I have no doubt that you could hit well over 900 with that turbo on the right setup!!

 

that's the plan... built 3L, and turn it up, I think I'm already the first supra to go 200+ in the mile iwth a 67, shooting for 215 in March

 

Wow! Great numbers. Take it to a dynojet and see how it does.

Steve

 

it'd be eleventy million hp ;P... but even a 5%bump would put it in the mid 850s...

 

Ha, congratulations on the new results man!

Wanted to chime in here as a recent ProEFI/PTE 6_66 convert myself. Your experience and sentiment sounds very similar to mine during the recent build regarding playing the "guess what it made NOW" game - Larry would call and tell me' "guess what it made at Xpsi." I would gues, he would add 100whp to whatever I guessed, and then we'd exchange "wtf's?", and sit there going :scratch:

Lol.

Glad you're happy with your new setup bro. I'm thinking seriously of coming down to run the mile with you next spring.


Craig

 

what cams/intake/ic are you running?

 

Hks 264 stock intake manifold and greddy 3 row

 

nice numbers for sure....glad to see it putting out some good #s since thats the turbo ill be running also

 

Those are crazy numbers. 38psi is a lot of boost on a stock motor. You are brave my friend.
How u gained 300rpm spool going from 84a/r to 1.15a/r I dont know. Maybe the cooler weather gave the spoolup gain but in hotter weather that would mean you spooled the same. Absolutely amazing.

Is there another graph posted I am getting 2 red X's on the screen.


What happens after 7K rpm? Does the power die off or stay flat?

I might have missed it but what fuel is this on?

Any chance of hitting a dynojet?

 

We only ran to 7000, redline on car was set at 7500 - the ONLY time the car ever sees higher than that is at the mile events. However it seemed to be staying flat. The weather I think is negligible - It was only 20 degree different, if it were 50-60 degrees i'd think it'd be a bigger deal - but in addition to that, my AIT's, the actual temperature of the ingested air was only 10 degrees diferent, and by the end of the pull they were nearly identical.

is anyone else NOT seeing the graph?

I'm on e85, according to my ethanol sensor I was at 86% ethanol last night. I concur with you on the spool - I can't explain why I picked up 300+ rpm of spool on what I would consider a gigantic change in AR, I fully expected to LOSE 500 rpm and move my power band more to the right, that's not what happen at all - I picked up power across the entire range and more than 100 hp at peak while still increasing the power band.

just to clarify both pulls were the same gear correct?

Yes, fair question - all my dyno tuning and dyno pulls are in 4th, unless we're trying to specifically tune for weird part throttle issues. To be clear the previous turbo and power got my car to 201.7 at the mile.

That is a fantastic powerband!

Ian

Thanks... I haven't really felt it on the street yet because it's frankly a bit silly...the car is an absolute monster.

 

just to clarify both pulls were the same gear correct?

 

That is a fantastic powerband!

Ian

 

I've found frequently that, at times when reducing backpressure, allows more air/fuel charge into the motor. When this happens you physically have more exhaust energy. Now why this happened somewhat on a base percentage across the entire RPM band, is probably an amalgamation of factors including a 20 degree change in temp, perhaps removal of a boost leak, and more exhaust effiency on that 66 wheel.

 

agreed - I have detailed logs of all the pulls, just haven't had time to go truly anlyze them compared to other logs, even at RPMs from vacuum the car was making more power. I want to reiterate that while it was cooler it wasn't like it was 110 degree heat vs 55 degree - it was just below 70 degrees on the 6765 and 52 degrees last night - both sessions were done at similar times, about 6:30pm, and my logs show the actual AIT variance was even less, 10 degrees at the start of the pull and less than 1 degree at the end of the pull.

I would point out those numbers are NOT weather corrected, so the variance may be less significant, however the butt dyno tells a whole new story, including some brown skid marks - the new turbo makes the car damn near unstreetable with my normal PS2s on - where as the 6765 I could easily control it... I Realize that's totally annecdotal, but I beat my car up nearly every time I drive it and the raw feeling of power delivery is significantly different - and literally scared me which is a first in a very a long time.

Also, I believe that I could have significantly reduced boost, and increased timing and made similar or better results, we spent a ton of time tuning the 6765 and optimizing the timing curve for it's power delivery, last night we spent maybe an hour on the dyno making sure the boost curve was controlled, and then turned to timing, where a single degree picked up 20+ hp in the mid range. That tells me there is a lot more power to be made in timing.

Because my plans include building a high compress 3L we didn't truly optimize the tune last night, as my goal was to be over 800hp and we did that with ease. I'll spend the money on the dyno after the built motor and run this thing at 40+ psi

 

nice numbers what size injectors do you have

 

2150 FICs

 

I'm not at all surprised with anything shown here. Great results and congrats!

 

Maybe I missed it, but were these both Precision turbos?

 

yes both precision, one 6765 the other 6766.

 

Awesome numbers bro. Car must feel awesome!

 

Damn, nice numbers. 750 lb/ torque is crazy. That's my next turbo for sure.

 

awesome #'s Zach and props to Chris D. for his excellent tuning ProEFI skills. I can't wait to get the full potential on my set-up!!! He'll have his hands on my car soon!

 

He did a great job with my car too...props to ss and Chris!!

 

Pretty sure Im going to have a for sale add on my 47-88 set up, This shit is clearly the way to go for me! Those are some bad ass numbers! Id be waiting 3 days for the spool you achieved in a micro second! Congrats!

 

SSA and Chris Delgado also tunes my car. Great service and results.

This thread has probably sold 50 units for precision, wont lie I'm considering it!

 

Nice results! Thanks for sharing, makes me think about my own plans for sure. I have a non-billet 6765 currently with a .81 non-divided housing but since I have a Greddy divided manifold I am strongly looking at the new 6766 with a divided housing... I was looking at the 1.00 and hadn't considered the 1.15. Probably running pump gas primarily unless I can find a way to get E85 more readily available in my area.

 

If you are running pump gas dont expect to get numbers like this. The E85 fuel is the biggest factor I personally think in these high dyno numbers. SP's own test showed 33rwhp difference in E85 vs pump and that was only on 19psi. Im sure the gains are more with higher boost. I want to pull the trigger but dont think I am yet not until I see some C16 numbers or something. Plus 38psi is tooo much especially if you dont have E85 at your local gas station.

Dre99gsx im glad you chimed in. I know you have been considering the switch also maybe someone local can lend you their unit...haha

 

congrats on the good numbers man... i cant wait to get home!

 

I forgot to ask, do you know what your low boost or pump gas numbers were on this setup?

 

Great numbers. Nice to see someone measuring back pressure and posting the results.