StealthFox

how do these two turbos compare? which would you choose for a big HP project? im considering doing a high boost RX-8 in a few years when i get bored of 275whp or so and more people start messing with big turbos and messing with the RENESIS rotors to lower compression and doing big fueling mods, etc.

epitrochoid

checl the go big or go home thread..towards the end. it was dicusssed a bit.

DARKMAZ8

I like the g35r but I would wait and see what's gonna be out there in a couple more years. I think that most ppl would be satisfied with the greddy kit. Huge hp comes with compromises. Depends on what your goals are.

Fanman

What's interesting is that some of people on the 350Z board who are looking at the single turbo Turbonetics kit (comes with 60-1) but are already inquiring about the 62-1 (supposedly flows 10% more).

StealthFox

thanks a lot dude

StealthFox

thank you captain obvious.

guitarjunkie28

and the 62-1 has now been discontinued...god knows why...it was a great seller.

anyhoo, it's been replaced with the gt37 wheel. it flows a bit more than the 60-1.

here are the 60-1, 62-1, and 35r compressors.

StealthFox

O.O ::bows on floor:: thank you so much man.

guitarjunkie28

and just for fun...

first one is a 60/62 overlay and the second is the 35r/60 overlay.

you can see how the 35 is capable of a lot more boost pressure efficiently. it ultimately has more power potential, but you do have to crank it up past 20psi to get it. at say 12psi, you'd probably never notice the difference between the 60-1 and the 35, but the 35 keeps going after the 60 quits.

StealthFox

indeed...would have expected a bigger spread between 60/62 than 35r/60...

guitarjunkie28

if you look at the peak efficiencies, the 35 is very well suited to the older 13b's. stock or streetports do very well with them (76-79% efficiency). i don't know how it's going to like the renesis--maybe a 30/35 or 37...something a wee bit smaller might work a hair better.

StealthFox

thats if they can manage to fit the 35 in there, by the looks of it the biggest we can fit is a gt30r...anywho upping boost in the renesis is going to be a nightmare, or at least a pain in the *** untill some people start experimenting with big *** turbos like the 35r

guitarjunkie28

they stuff 60-1 wheels into t04b housings and call it a hi-fi. you lose like 8-10%, but i'll bet they can do that with the 35 if space is a concern.

sub-zero

The new Gt wheels are way more efficient then the old T-series. I am not sure why every one is looking at bigger compressors when there are limited ECU`s out there for the 8. I have not seen many guys pushing over 9 psi without detonating. The Greddy tubo kit will be good for at least 12 psi if there was an ECU that could properly control the timing and fuel. Wait untill Apexi makes a Power FC for the 8 then we will be able to push big HP. Also the turbine housing size is very important.

colin204

You are correct, after test fitting the biggest turbo I could fit down below is the GT30 with an .82 exhaust housing and you still have to modify the engine mount to get the 3" inlet to fit.

Fanman

How much better would a 30r be vs. the current T618Z ? Would it be dramatic enough to spend $1000 for the turbo & probably quite a bit more to modify the current kit.

colin204

I think it would be worth it only if someone can work out the enginemanagement so that you can take advantage of the turbo.

StealthFox

heh pretty good guess. looks like we'll have to see if we can move some stuff out of the engine bay to make room.

RX8-TX

Dave....out of curiosity...lets say for example that I've got an engine that flows something like this:

4,000 rpm - 13lb/min
4,500 rpm - 15lb/min
5,000 rpm - 17lb/min
5,500 rpm - 19lb/min
6,000 rpm - 22lb/min
6,500 rpm - 24lb/min
7.000 rpm - 27lb/min
7,500 rpm - 28lb/min
8,000 rpm - 29lb/min
8,500 rpm - 30lb/min

Also, pretend for a moment that the spread from 2,000 rpm & 4,000 rpm goes from 7lb/min all the way up to 13lb/min. However, I am not concerned about that portion of the powerband for some obscure reason. And I just want to pump in air most efficiently between 4 & 8K5 rpms.

Based on the 2 maps you posted, how do you determine which compressor is a better match -and at what pressure level? And how do you easily determine pressure levels from just looking at the map? Or is it simply a product of having spent countless hours going through maps before?

Thanks!

RX8PR

quitarjunkie,

the new GT37 is the same frame size of the GT35?

the wheel size is between a 60-1 and 62-1?

thank you!

Manuel

epitrochoid

speaking of engine airflow...anyone have any numbers for the renesis

..those numbers look suspiciously close to what a renesis might flow though lol

RX8-TX

http://www.myrotarycar.com/mazdarx8/...ncy.020105.xls

StealthFox

you rock.

rotarygod

My friend Brian Cain in Dallas had a 60-1 HiFi (the small 60-1) on a streetported RX-7. At 15 lbs of boost he put down 425.6 rwhp. You don't need huge turbos to get big numbers. I feel this is the single biggest flaw that the rotary community has. Bigger is not better unless you need it. Most rotary people have turbo envy and want huge honking turbos under their hood for whatever the reason. Brian wasn't going to get much more out of the HiFi but that's because he was in the turbo's sweet spot. There are alot of people out there running T-66's and larger that can't touch 425 rwhp at 15 lbs of boost. I think that's more than enough for street use. There are a few that run turbos they can use properly but for the most part the rotary community as a whole uses turbos that are much larger than they should be.

colin204

Rotarygod

What do you think the max hp a GT30 will do at 10-12psi?