eyecandy

iTrader: (19)

I am looking at getting an aftermarket turbo for an FD, and I want a BB turbo. DOes anyone have any experience with the GT3037 series? Or the T04 BB turbos from Turbonetics? Or how much of an upgrade/less response will I see with a GT3040?

I have a few general Q's about the turbos, first of all what is a good A/R to look for and and I assume that means the size of the comp/turbine housings. ALso were can I find out more info on how to choose a turbo?

I am not looking to make alot of power, I am just looking for more response and quick spool up, so I really do not need a 600hp turbo where a 450hp will just fine. looking for a nice broad flat power band. I honestly probably would only be making tops of 330-380hp, maybe more if I want to have some fun, but that is really of not that much of a concern. BTW how much boost can an upgraded SMIC (Blitz, Greddy, etc) run without blowing up?

Let me know what you guys can help me with!

badfish229

I hear for rotary engines, a good range of A/R is 0.82 - 1.20. Usually, companies such as HKS, Blitz, etc. have graphs for power ranges vs displacements. The best charts to look at are compressor and turbine maps. I wrote a thread about the GT3037 that has yet to receive a response. A GT3037 has excellent spool time, but I fear the boost will fall off at high rpm. Also, I hear this particular turbocharger can produce insane boost. For example, HKS' time attack Altezza runs at about 1.67 bar with a GT3037S, and produces 650 hp. It is a choice turbocharger for 2.0 liter piston engines such as the SR20DET, 3S-GTE, 4G63, etc. Since you are looking for less than 450 hp, something like a GT3037 may be in order.

Contrary to the myth, boost doesn't blow up engines; detonation does. A good rule of thumb, at least for me, is to run an intercooler at anything higher than 7 psi. Without an intercooler, the charge air will heat up, making it easier for the engine to detonante.

If you want to learn more about turbocharging, try reading Corky Bell's book. It's pretty basic, but it's a good starting point .

Zero R

iTrader: (1)

GT35R .82 housing would spool very well and be in the power range you want, and if you choose to go larger later you can always upgrade the rear housing.

Broken09

iTrader: (1)

Just as a reference I have a 35r. With the porting I have done I was seeing 15 psi by 3500 rpm. It's spools very quickly and is ideal for the power level you're looking for.
-Nic

eyecandy

iTrader: (19)

Where can you get a GT35R? How much bigger is it than the GT3037? How is the turbo for driving around town? Is it like no bosst then BOOST? or is it smoother with a BB turbo? My only grip about the GT35R is that it maybe to big for me.

Badfish229, you are correct in some aspects, boost creates more stress/heat which causes detenation. What gave me the idea of the GT3037 is FEED is using iton there FC andit ismaking 450hp, which is well over what I am intending on doing. See unlike most people on the forums, I am going single for better resposnse, I can savemy self the $3k and keepthe stock setup if it was all about HP, but its not. If I wanted power I would just slapon a To4 series and call it quits.

Zero R

iTrader: (1)

The 35R broken09 is speaking of is the larger 1.06 housing so you will spool a lot sooner with a .82 You should be right around the HP level your looking for as well. It is a hard turbo to beat for response normally I wouldn't recommend a .82 but if your trying to be around 380 it'll do it.

Broken09

iTrader: (1)

You can get the 35r from A-Spec Tuning (www.a-spectuning.com). You won't be dissapointed if you choose that turbo.

eyecandy

iTrader: (19)

Hmm, how does the GT3040 rank amongest these?

badfish229

The GT3040 is a weird turbocharger. I have yet to see one strapped to any rotary engine. It's not that it cannot be done; there are much better turbochargers than the GT3040.

eyecandy

iTrader: (19)

Let me guess, is it a cross between like a Gt3037 (compressor) and Gt40 (turbine)?

Where can I find more info on the GT35R? And that is BB right?

I want to try and find to most efficient turbo possible for what I want to do, so if that means I have to sacrifice power for response that is fine, I just do not want the power to drop off at high rpms.

badfish229

I believe the GT3040 is a GT30 turbine and a GT40 compressor. You can go to

www.turbobygarrett.com

to find more information on the GT35R; download their catalog . According to Garrett, the R denotes a ball-bearing CHRA. You can pick a GT35R, GT3037, or even a T88H 35GK, but making good power is all in the tuning. Look at compressor maps. You want you pressure ratios and your mass air flow to fall under the highest efficiency islands. There is more to that through. You need to account for your port timing, AFR, ignition timing, etc. There are many parameters you need to address before choosing the right turbo system. You may just be better off with a ready-made turbo kit, such as Apexi's RX6 turbo kit, or GReddy's T78 kit.

fastrotaries

what NO disco potato?

badfish229

What in the hell does that mean anyways?

Zero R

iTrader: (1)

They sell the "disco potato" that catalog is never accurate so be careful what you read in it. The 30/40 is a 35R comp wheel with a smaller 30R turbine wheel. I wouldn't run it , I would say stick with the 35R .82 it will spool like the twins and when you get bored and want more just upgrade the rear.

eyecandy

iTrader: (19)

Broken09, what the a/r of your GT35R? Also from my under standing the GT35R is the same compressor side as the To4s. DOes that mean the GT30R is the same as the To4e?

Can someone please help me understand how to read a graph for a turbo?

eyecandy

iTrader: (19)

Well know I am going to throw another turbo in the mix: IHI RX6, where can I find more info on the specs o fit? I have been searching for an hour and cannot find anything anywhere!!

badfish229

I believe the Apexi RX6 turbocharger is derived from IHI's RHE series turbocharger. I don't have the exact specs; IHI is very secretive about its turbochargers. Luckily, you can find out more on IHI turbos on their U.S. webpage .

www.ihi-turbo.com

I believe the best way to find out is to call Apexi USA.

Zero R

iTrader: (1)

Eyecandy the wheels are far from the same on the older T series turbos as the newer GT series a same sized wheel in a TO4 will not be as broad a power curve nor are they as eff.

RacerXtreme7

iTrader: (2)

T04s is a compressor cover, not the compressor wheel. The GT35R has a comp wheel simular in size to a 60-1 (the 60-1 is often reffered to as the T04s because thats the comp housing it comes with). Yes the GT35R's and GT30R's come with T04s comp housings (dependant apon who built the turbo). the Disco Potatoe is tooooo small for rotary applications in general. Most going single are looking to make 300hp and over at the wheels.

~Mike..........

eyecandy

iTrader: (19)

Thanks for the info guys!

To bad IHI's site sucks for info, I like Garretts better, LOL.

Yeah sorry my bad, I meant the compressor cover, not the wheel.

I have been doing alot of seraching on the forum here about the RX6 turbo, and I have seemed to have found some good results. More or less, it seems this might be the turbo for me, only problem I see is that the turbine side is smaller than the compressor, which makes me belive that there might be back pressure created at high rpms. Will more boost creat more back pressure?

What I would really like to know: would there be more or less back pressure with say the RX6, GT3037, GT30R , stock twins, or the stock twins (nonseq)? I just do not want to create any extra thermal stress with back pressure, and power is not what I am after, I want the response and less comontion.

Zero R

iTrader: (1)

Least amount of back pressure of what you listed would be GT3037 30R, but keep in mind that is also if they were running same A/R on exhaust side. they both run the same turbine wheel. stock twins non-seq. will run slightly less back pressure if the manifold is ported but it still sucks compared to a single. The 30R is nice but why not pay the $50 bucks and just get the 35R it will still spool plenty fast enough for the street even on stock ports, and if you want to go larger you will be able to in the future as well.

RX7MONSTER

Fastest hillclimb car in aus uses the GT35R 1.06A/R. he says its too responsive
dont waste your time on a GT3037S