Hey guys,

I know that there is archived threads about single turbo set ups and so forth, but I haven't been able to find the right info.

I am pretty knowledgable about working on cars and do all my own work, however there are three things that I refuse to touch, I don't touch turbos, fuel systems, or transmissions besides bolting them on and off if it is that easy.

With that said, my RX-7 has become a fairweather car only and I want to put in a Single turbo. I'm not trying to turn it into a monster, I just want a small turbo that will help me hit around 375 or 400 hp.

I've seen alotta turbo kits and like dealing with RX7Store.net. Everyone on here is talking about how turbo kits are about 4 grand and what not. I'm not sure I understand that because RX7store has a bunch that are under 3k, and I'm not trying to break the bank on this.

Here are a couple that I have looked at. Let me know if what you think about them.

1. GT35R (T4) Turbo Kit 93+ RX-7 - $2,699.00
2. GT40 Turbo Kit 93+ RX-7 - $2,300.00 Why so cheap?
3. GT40R Turbo Kit 93+ RX-7 - $3,100.00 Has dual ball-bearings
4. T04R Turbo Kit 93+ RX-7 - $2,350.00

Now all of those say they are capable of all kinds of power, but are all rather cheap compared to the APexi's, and Greddy's. What is the cons to these turbos. They all come with the neccessary fittings and accessories.

I've got some cash to burn, what do you guys recommend.

Also, I realize I have to upgrade the injectors and rails, any recommendations?

Besides that I have the rest of the upgrades done, power FC, upgraded fuel pump, Front Mount intercooler, etc. Let me know your thoughts...

 

i am looking at doing the same thing.
i think i am going to go with the hks set up..
the T51R SPL.. its big and pricy.. i rode in a fc the other day that had it and let me tell ya.. it felt like my spine and the seat were connected for a while.. it even popped my back..haha.. it was the biggest turbo lag.. but once the monster kicked in.. gods foot came down and booted the **** out of the car..haha

 

I'm not sure if you already have it, but you're gonna need a clutch, blow off valve, and boost controller. Those are all good turbo kits though. A lot of people go with the gt35r, it's proven to be a good street turbo.

 

given your objectives i suggest you give serious consideration to the A Spec GT3574

https://www.rx7club.com/showthread.p...9&page=1&pp=15

it features the popular GT35 wheel which is efficient and works well at modest boost levels. Sean has wisely combined this in a non BB package. opinions are all over the place w regard to ball bearing V journal bearing turbos.

the margin of performance between BB and journal bearing turbos is much much less than many believe. they also work very well from a longevity standpoint if you run the proper size restrictor... about .08-.09.

sean has also added a larger hotside turbine wheel which the rotary always needs.

the price, being non BB is also advantageous... whatever it is.

as to the GT40s. look at the compressor maps. given your objectives, you don't want them. they work in a narrow range at high boost.

everyone has there opinions.

mine is: for a 400 or thereabouts turbo at the right price you can't beat the GT3574.

good luck,

howard coleman

 

im not 100% because i havent looked at the FD stuff on their site, but i think the reason your number 2 kit is so "cheap" is maybe because the turbo is non-bb. thats counting on it comes with a manifold, downpipe, and all the fittings. also, dont forget you need to get a wastegate.

as far as fuel recomendations for fuel, Rx-7 store has nice stainless braided setups as well as www.KGparts.com personally i like KG parts, but its all preference. oh, and for those hp numbers, go with the 35R. good luck!

 

Aso, I do not and do not plan on getting any kind of port job. Does that mean I should try out the GT35R? I've heard that the GT35R and the T04R are pretty much the same thing except the T04R can get more power, but has more lag as well.

I PMed Zero R about the GT3574 kit he talks up.

 

Who's telling you the 35R and the T04R are the same thing? They're two totally different turbos with different compressor maps, response, and power at a given boost level.

 

Fair enough, care to elaborate?

 

The 35R has a smaller 61mm compressor wheel vs the 67mm wheel on the t04r. Also, the turbine wheel on the 35R is about 6mm smaller than on the T04R. The 35R will spool more quickly and in my opinion is a better turbo for an FD running up to and around 1 bar/15ish psi boost. The T04R is the better choice if you plan to run higher boost levels, 20+ or so.

I agree with Howard Coleman, the a spec gt3574 is a great setup---basically a plain bearing 35R cold side mated to a larger T04R sized hot side, if I'm not mistaken.

 

JamesVaughn3rd,

from what it sounds like you want, i'd have to second this statement:

 

OK, GT3574 it is.

 

Plus, you can't beat the price on the kit, it's something like $2300.....

 

hmmm, I'm not sure he would want you to be tellin that price on this thread considering his quote to me was a couple hundred more than that.

 

That's why I said 'something like'. By the way, you're welcome

 

You should consider the T04Z. Its in between the 35R and 40R.

http://www.rx7store.net/Garrett_Turb...ett%20t04z.htm

 

Hi, there.

To add some more confusion, could someone explain how the Mitsubishi and Apexi IHI RX6 turbines compare against the GT35xx's and T04's.

I noticed that Garrett's are quite popular in the US, whereas in Japan everyone (e.g. TRUST/Greddy, RE Amemiya) is using Mitsubishi ones (e.g. TD06-20G, TD06-25G, TD07-25).

Also, any reasons why noone is mentioning the Apexi Isamu IHI RX6 turbo kit?

FYI, I recently bought a 3rd gen RX7 with GT4088 turbine, but am looking for a more streetable setup (e.g. ~350 RWHP at 1.0 bar (14.5psi) on pump fuel (91 octane) with max boost at 3,000~3,500).

 

^^People don't usually mention the RX6 because it's very expensive and has a small hot side. It'll make your goal of 350 at 1 bar easily, but that's not a very lofty goal. BNR Stage 3s (upgraded stock twins) run sequentially will better that power output easily and spool more quickly at half the cost.

Garrett's are popular b/c parts and support are readily available, not so for Greddy/Mitsu turbos here.

 

Thx for your insights, GoodfellaFD3S
I know that 350-400 RWHP is not that much, but as I just blew my engine at 15 psi, I am looking for a very convervative setup with max boost ~12psi. Given that my car was tuned by an experienced Japanese tuner, I suspect that the cause of engine failure is related to to the poor pump fuel quality in Korea. A UEGO wideband sensor is definitely the top-priority item on my long shopping list.

Do you have any specific info on how the RX6 and Mitsu's compare against the GT3582T4 and/or T04S/Z?

Can you also explain how a "small hotside" affects the behavior of the turbine (e.g. spool, torque and power band)? Thanks.

 

One more question regarding the BNR Stage 3 twin setup. Haven't thought about a twin setup before, but I just checked out your old BNR Stage 3 thread and it looks VERY interesting. (https://www.rx7club.com/showthread.p...5&page=1&pp=15)

Are you still using this setup, and can you elaborate on your experience? What's are the requirements and expected cost to convert from a single turbo setup back to a BNR Stage 3 twin setup? For instance, can I use my current intercooler piping, manifold, downpipe etc. FYI, my current setup is at the vbgarage.

 

No Kit, no buy. That looks too fancy for me anyway, 700 hp? And out of my price range.

 

I can do that turbo in a kit for around $2600.

 

if you blew your motor at 15 psi and it was properly tuned and fixtured you really need to run an Auxiliary Injection system to solve the bad gas situation. go to the AI section and do some reading...

i am making over 500 rwhp w no knock and 1100 F egts preturbo w the help of methanol. can you get methanol, ethanol or isopropyl alcohol in korea?

howard coleman

 

Sure thing, it's nice to be thanked for providing helpful information

For a conservative setup at 12 psi, I think the apexi' rx6 will work very well for you, with a good useable powerband. Most of us going with bigger turbos want 400-450 rwhp and up.

The smaller (relatively speaking) turbine wheel and turbine housing of the RX-6 will lead to boost/spool/torque earlier in the rpm band, but towards redline it tends to run out of steam a bit. It's all one big compromise

 

I recently changed to a bigger single turbo with 30 psi capability.

to go back to a twin setup, you'd have to have alllll your stock related stuff---y pipe, manifold, intake plumbing, rats nest (if sequential) etc. In this case I think a smaller low boost turbo like an RX-6 is the best bet for you. Too much work to go back to twins.

 

Ok, so due to A-Specs lack of response to me telling him I want to buy it, Jason here has opened a new door.

What do people think about the T04Z? I think it may be a little too much race turbo. I'm just looking for a good street turbo.