Different dyno's, different engines, different setups, different dyno numbers. Talking about numbers is pretty useless unless done on the same exact machine (both car, dyno, and tuner as well)

thewird

 

850/1600 injectors, Walbro pump, 93 pump. We didn't expect that kind of power and I'm sure we're exceeding what the Walbro can safely support. Backed the boost down to 13 psi and told the owner to leave it there.

 

so you're thinking the pump couldn't push more and it wasn't that you were hitting 100% idc?

thewired, yeah I know, I tend to forget sometimes how much dynos can vary.

 

Someone posted a rotary GTX35 dyno? Link?

 

it might not have been the gtx, I need to look, gimme a bit.

 

it wasn't even a gtx, it was a 3574 at 17.5 psi, no dyno sheet though
https://www.rx7club.com/3rd-generation-specific-1993-2002-16/how-go-single-turbo-set-up-sequential-twins-938762/page2/

 

Those numbers seem exaggerated at that boost level. There have been gt35 that have made close to 500 or a lil over but that was at higher boost!

 

That's my thoughts. Didn't even bother watching fuel pressure. We made one (aborted) pull at the 16 psi boost level, saw the trend in injector DC v. AFR and the power it was making and decided we didn't need to push the little Walbro any further.

FWIW, I've done back-to-back testing on this Dyno Dynamics and a Dynojet. We saw exactly 15% higher numbers on the Dynojet with a car that made right at 400 whp on the Dynojet. Dynojet numbers are very repeatable from one dyno to the next and they have dynos everywhere, so I usually reference those numbers.

 

but aren't individual shops able to change some things on the dynojet to make numbers appear higher if they want?

 

so to sum this up...with a large streetport,an efficient fuel system and generally a good setup someone could see 500whp at 22psi and have full boost below 4000rpm...correct?

 

Seems like that's a safe assumption based on all that's been posted here.

Thing is, my 500R (which I've had installed for around 4 years now) stacks up pretty well against this turbo. What exactly are you guys gaining? Transient response? At the boost levels discussed, I'm not seeing the benefit. BTW, this is exactly what Bryan at BNR told me when I asked him about billet wheels a long while back when they first hit the market.

 

rich i think the advantages will be in the high boost level 22psi or more. again it will be minimal, as i spoke with enzo about the design and p trim size turbine wheel that the 6765 has. he seems to think its going to be limited to 25-27psi due to the turbine wheel. if i had known a bit more before hand i would have bought the 6768 billet. the compressor wheel is designed for high boost as it does have the surface area of a 71mm cast compressor wheel. on the supraforums you start to see a good jump in power at 22+psi over a normal 67mm wheel. on a supra they see 700whp at 30psi out of a cast 67mm and 800whp at 30psi out of a billet 67. the evos can run silly boost so the billets are the best thing since sliced bread for them. they gain close to 200whp in the 40+psi boost levels.

 

As far as it concerns me i just wanted to see if this turbo is going to be a good transition from my BNR to single.....and i think that with the assumption made above it satisfies me

 

Hey goodfella, if your interested I could send you my old 6765 if you'd like to test it on your car to give a comparison. I could pick it up at the dgrr after.

thewird

 

Sounds a bit low.

Agreed.

The billet 6765 should have similar response, but you will see lower intake temps, and at higher boost you will see much better efficiency. They do shine at very high boost levels, but even at lower boost you will see some gains.

 

Send him the turbo! Those are the two turbos I am trying to decide between!

 

Just send em to ol Howard C.

 

Howard's car is not back together yet

Also I am interested in the Aspec 500 and the 6765. They are not being tested in Howard's thread.

On one hand you have Rich speaking very highly of the aspec 500 (as do MANY people on the forum). On the other you have thewird who has ran both the aspec 500, and is now on his second 6765.

It sounds like both turbos will get around the 500HP mark but I would be interested in seeing back to back comparisons.

Things like
Power under the curve
What one has better response
Does one produce more power than the other.

 

I hope to have my car ready for the dyno sometime middle of April, though mine will be representing the 6265...and if something else on the car doesn't claim my wallet, hopefully a 6765.

Howard's stuff will be done this week so it's almost perfect timing for you.

 

Double_J, the 500R is indeed an awesome turbo and I loved it when I had it. However, if you stick a 0.84 A/R divided housing on a 6765, the response will be pretty identical to the 500R imo. Except the difference would be the turbo has more potential at higher boost as well as doing it more efficiently. However, the 0.84 turbine housing would also be a restriction for what the turbo can do which is why I do not use it, and instead use the 1.00. I noticed an improvement when I put it on my car with nothing changed in the car so I know it definitely is better. Unfortunately I did too many changes to the car last year and with all the exhaust leak issues I had never got the car to its prime but that will be different this year as I want to track it seriously again this year.

Maybe consider trying the new EFR turbo's with their lightweight turbine. I'm sure that will improve response however your going to have to get someone to make a manifold for it.

Anyway, lending the old 6765 to Rich would be a good test and I don't mind since I have no use for it atm.

thewird

 

^agree with thewird, the 6765 is basicly superior to the 500r in the 20+psi range. most people that plan on staying at 15psi and pump gas should run the a-spec 3574 turbo or a t04s. will make low 400's and boost well as it is a 61mm blade.

 

here is a little taste of the 6765 at 24psi. this happened completely on accident as i expected it to be at 15psi. so this was 24psi base tuned for race gas but 93 was in the tank. rpms went from 4500-6k and i let off. first thing that came to mind when it started pulling was this is way to strong for 15psi so i let out right away. i then looked over to a reading of 24psi. no knock came up on the pfc....

http://www.youtube.com/watch?v=ebAzi0bz8jE

 

What bov is that in the video?

 

greddy type s bov. also it was a 3rd gear pull from around 50mph.

 

Here is my last dyno I did with my HTA3586R T3 23psi and 17-18psi (I was having trouble with EBC stabilizing boost). This should give you an idea of what the 62mm billet wheels can do. I believe this turbo is similar to a 6262 with the only difference being that my exducer is a 86mm instead of 68mm. I think for road race purposes the 6262 is perfect. My motor had bad compression shortly after so I am not sure if the last run caused it or if it was already beat.

Anyways...Ignore the A/F sensor kept blowing out so I used my in car gauge to tune.