one of our board members is having his GT35 converted by FP to their billet wheel and should be running shortly. it will be very interesting as it appears the wheel delivers like a slower spooling 67 wheel that can crank out 550 rotary rwhp...

as to why billets offer advantageous flow... it appears to me they have smaller hub area per total wheel area so they have more vane area.

the GTX42 comparative compressor maps are astounding as to difference. from 74 pounds per minute to 88 at one pressure ratio of boost! airflow is everything... take a close look at dyno charts and note the immediate relationship between boost and hp. magic.

no doubt Garrett's GT35 wheel will be on the way.

hc

The comparison of a HTA35R to a 62/65 is pointless, apples to apples please, it needs to be 61/62 to HTA35R. Saying a smaller turbo comes on sooner so you get power sooner is really ground breaking news ;) Sorry for being a smart ass couldn't resist. Honestly though they should have compared either a 61/62 or if it was a billet thing a billet 60/62 would have been a better choice. You can't compare essentially a P-trim wheel to a 35R wheel and then be surprised the 68mm turbine outspooled(sp) the 74mm turbine, especially on a 4cyl.

Is the HTA wheel a good upgrade on the 35R? Sure.

~S~

Stop posting this crap.

~S~

"Stop posting this crap."

what he said

checking Garrett's site today reveals a NEW (the third) compressor map for the GT3582r and it is impressive. take a look, there is 70 pounds of air here. in rotaryland that means 527 SAE RWrotaryHP potential.




http://img684.imageshack.us/img684/5...gt3582rmap.gif

not all GT3582r models produce this output. the lower rung GT3582r (the difference apparently being the ported shroud produce less:

http://img101.imageshack.us/img101/3...68allcompe.jpg

it isn't all top end either. note at two pressure ratios, 14.7 psi boost, there is 4 pounds more flow. that's 30 rwhp!

all the more reason to get the A-Spec "GT3574" option which has a 14% larger "P" trim turbine wheel. there may also be other sources for a similar turbo.

the 70 pound output certainly gives on reason to ponder as to whether to go w the laggier 67 mm traditional wheel that makes 73 pounds at a higher boost level.

hc

Howard, first thanks for all this information. WE NEED THIS KIND OF STUFF. I was guessing at my turbo selection, now I am sure.:icon_tup:

I don't get how the ported shroud produces more power >_>. Isn't it supposed to be the opposite?

thewird

bumping this up!

my 4 turbo comparison may provide lots of info re the GT3582r...

https://www.rx7club.com/single-turbo-rx-7s-23/separating-fiction-reality-couple-days-dyno-903611/

howard

I forgot about the R85. Not many people have it. The inconel wheel sounded promising but maybe it was the price that it didn't catch on?

More info on "billet" please? Does it mean both wheels are from one solid chunk of aluminum?

What about porting the cold side snail? I've seen that advertised lately but no dyno proof to back up the increase in hp claims. I know HKS did something similar with it's bullet holes but the one I saw looked more like the skinny part of a bridge port.

one of my motors dynoed last year w an R85 and i was favorably impressed. slightly over 400 SAE rwhp at 5500 rpm! 500 boost limited at approx 20 psi. awesome.

that's why one of the 4 turbos i am testing in my 4 turbo comparo is the uprated version of the R85. i want to see what it's got.

the BW S361.... the R85 has 6.667 sq inches aver comp area and the S361 has 6.946. both have 6.93 sq inches turbine area which is super for the rotary...

a GT3582 is 6.386 cold and 5.171 hot

does the smaller hotside REALLY make a difference?

we will KNOW shortly.

hc

No one answered this question. Is ported shroud better than non ported? I

I believe, and someon correct me if I'm wrong here, but you lose a little eficiency but you gain a bit of safety and one hell of a cool sound with the ported compressor shroud.

My thread: https://www.rx7club.com/good-businesses-233/great-work-mike-lowe-900953/

I had a 500R and got the wheel changed out with a billet. I can feel the difference and actually hear it whine down when I turn the car off!

re the Garrett "Ported Shroud"

part of my 4 turbo dyno evaluation will be to dyno the 3582r w and without the ported shroud. so we will have some answers.

howard

Garrett has chosen to put a period on this thread.

actually the GTX3582r is an exclaimation point!

just take a look at this newly released GTX3582r compressor map

http://img221.imageshack.us/img221/7...3582rcompe.jpg

76 pounds per minute at 26 PSI... that's 1100 CFM or

573 rw rotary SAE hp! WOW.

from a diminutive 18 pound package.

take a comparative look at the two prior GT35 compressor maps.. Post 30.

check out one bar (14.7 psi... 2 pressure ratios)

GTX3582r 67 pounds 505 hp

GT3582r ported shroud 60 452

older map 57 429

and that isn't taking into account a better efficiency ratio.

we will be testing this turbo in my comparison thread in the single turbo section.

if the map proves out this could be one of the first truly do it all turbo for the FD.

stay tuned.

howard

Are the GTX series turbos have different compressor housing design?
In other words for those of us who have the GT3582R can we just purchase a GTX3582r cartridge and swap it?

since the X compressor wheel IS different you will not be able (even if Garrett would sell it separately) to just swap it into your compressor housing as the profile is different. compressor wheels, to be efficient, need to have very little clearance between the wheel/housing.

IF you could get Garrett to sell you components, you would need a comp wheel and comp housing... then do a balance etc.

'probably be better to trade your GT35 and upgrade.

just my guess here.

howard

just thinking a bit more on the GTX3582R...

most of the 67 MM turbos, TO4Z, TO4r, GT500, PT67 have really big Trims. in other words the minor diameter is closer to the major diameter. the closer the minor is to the major the less spool-midrange you have but you gain topend.

the trim for the 67 class is 63.

the output for the non billet 67 is approx 73 pounds per minute. or 1056 CFM which produces 550 SAE rw rotary hp on gas w AI.

the GTX3582r has a 56 trim so it will spool midrange better AND it make 76 pounds of air or 1099 CFM or 573 hp.

more midrange and more topend.

all from a smaller wheel...

compressor average area sq inches

GTX3582r 6.519

TO4 class 7.003

2011 is going to get interesting.

howard

Wow..... 56trim making 76lbs of air.....

seems like the GTX3582R may be right up my alley

I had a customer do a back to back, one pull after the other with the regular compressor housing then switched to our style of anti-surge housing and it picked up 21rwhp. This was a To4Z @ 18psi stock ports. We tried two days again to test and were not successful. Only a matter of time however...

so the GTX35 has an awesome new compressor wheel but how about the turbo side, are there any changes? what's the backpressure and spool characteristics going to be with the GTX35?

I wonder how the performance would be of this comp wheel mated to a lightweight turbo wheel (like new BW) if even possible !

i ma new to the site but I believe my question is on point. I have a ported engine with 3mm ceramic seels and 8.5:1 compression ratio
I want to go bigger but not TOO big. I am between the GT35R and the GT4088 non ball bearing

My friend and tuner said that I should expect rounf 470-480BHP (motor ) round 1.2-1.3 bar

But the GT4088 could produce 500BHP ( motor ) @ 1.2-1.25 bar

What do you think. Which one to choose. I respect your wisdome and experience and would like your help-opinion

My target is a healthy 490bhp (engine) at no more than 1.3 bar

you want 490 at the crank? so roughly 420 at the wheels? get the 35r.

Is this coming from personal experience. I am asking because boost levels can be an issue

my friend and tuner running a similar spec engine got 562 crank @ 1.5 bar so I was hoping round 490 crank @ 1.2

If for any reason I decide to go for more I know that the GT4088 has plenty where the GR35 will not offer similar figures

Bear in mind the 19 psi will be my boost limit

So if the GT40 offers 480-490 at 17 psi what will the GT35 do? and what if it's not enough

I would have spend 2500$$ and run out of option

That will not be the case with the GT4088

I hope LOL