Hello everyone. I just wanted to ask anyone to chime in and let me know everything they know about these turbos. I have searched and cannot find much info on them. Tell me everything, like what kind of motor build should I have on my 3rd Gen to run this turbo. I do drag race, and do highway runs, and I am not afraid to run some boost. My car will not be a drag-only car. I will drive the car on the street whenever I feel like it. Please, just let me know my options on the different ARs of this particular turbo and if I can get an Anti-surge compressor housing. And, on each different motor build, when can I expect boost or full boost(at what RPMs). What is the ~power output of this turbo on each engine build? Anyway, any info will greatly be appreciated, because this is the turbo that I have ultimately decided to go with for now. Thanks

Dee

 

Universal, GT42R, 1200hp, 76mm Comp Wheel - Ball Bearing, GARR GT42R-76

run about 3k and HUGE turbos. i think a forum member may be running one already.

 

Thanks razorback. Anyone else have more to add?

Dee

 

Xcessive is running one. Search his name. He made some nice numbers with it. Good luck on the streetability though.

 

Oh, I do understand that it will not be the most fun car to drive on the street, but I will be driving it anyway.

Dee

 

The GT42R that Xcessive tuned is a 100% street car. Spool isn't as bad as people would think. But when you do hit boost, hold on

 

LT1-7: Yeah, that's what I was thinking. I am ready for that boost to come on strong. At least I think I am. GT35R is just not enough. Hehe

Dee

 

Xcessive: Do you have anything to add to any of this?

Dee

 

There is a stock port/sleeve 20b on here that has the regular Gt42 that gets 8psi by 4,500 rpm's. I think it had the 103mm compressor and A/R was 1.15. This makes me wonder how much faster it would spool with a port job and the ball bearing version? Anyone want to take a guess? I'm thinking 8psi could come by 3k.

 

Yeah, that would be nice. Now if only I had a 20B to go along with it.

Dee

 

What is your goal? Most likely a T66/67 is a better choice. There is ALOT of custom Fabrication invoved in a 42R. If you were going that route, Magnus motorsportshas already done the work, and has a kit that retails 5-6K last time I looked. Try a ~5" exhaust, for starters. Unless you have Racelogic TC, or 335 R compound tires, the car will be almost undriveable. Tyson can comment, but you end up using half the turbos potential, and have to deal with tons of custom work to make it fit. By way of comparison, a 66, 67(TO4R) can make 600rwhp with the larger AR hotsides quite easily, and have about the same response as a 42R. Figure another 10K at least in hardware to support that sort of power, then add labor. Properly suspensioned, and driven by someone that can drive, a 450rwhp 7can run 10s all day long. I am assuming you are concerned w/drag, since a 42R is not good for much else unless you are a master of innovation, and fabrication. Point is, it is very exoensive overkill, and your manifol/exhaust/IC piping will not be compatible w/anything else if you don't find that you like it after sinking 20k into a set-up. am assuming in these numbers you are starting with a stock vehical. good luck, Carl

 

https://www.rx7club.com/showthread.php?t=394547 Here you go. That is an absolute steal.

 

Whatever the guysays, figure complete loss of all meaningful traction once boost hits. if iit is already sold, ask him why he sold it. Carl

 

Carl, thanks for the info. I already have an Apexi Power FC, Fluidyne Radiator, and I have the money to get my motor built. What I need to be able to decide, is what kind of motor build I will need to get the best performance out of that turbo setup. I will be buiding the motor first and driving around and breaking it in with the stock twins for a little while, then once I have enough saved up, I was wanting to go the single turbo route. Just wanted to go with the GT42R. Thanks again.

Dee

PS. If you have anything else to add, please feel free.

 

With a ported motor you can expect to see both higher dyno numbers as well as better spool. Honestly for this turbo I wouldn't port my motor any smaller than a half bridge. No offense to you Carl, because I know you know your stuff when it comes to road racing, but if you want to know honest information from someone WHO HAS experience with this turbo, you should call Sean at ASPEC tuning.

- Steiner

 

Thats a big freakin turbo !!!!

 

Yes, it is. And I will hopefully be going with one.

Dee

 

No offense taken, Magnus was running a 42R before Sean was born (JK). Notice I refered him to Magnus, (the first I know of to get one running, and performing properly), and to Tyson who runs one. Again, my thought is why go to such fabrication lengths, when you can get the HP that most want out of this turbo with off the shelf parts? If he is building a 650-900hp car, that is different, but for 500-600 this is a pretty extreme way to get it. Problem is, the mani/IC pipes/exhaust will not work with anything else. A T51 can get it done and use off the shelf parts. A GT74/76 Q/S/R trim will do it as well. All these have 4" V bands(except maybe the 51 which is smaller), and use a standard T4 flange. Not to mention they are a dime a dozen on Supra forums, as the Supra guys have pushed past 850-1000rwhp, and are looking for more. Carl

 

Sorry I didn't see that you recommended Magnus, he is definately one to contact. I agree that other turbos could be used to achieve the same horsepower number with less effort. But if he has his heart set on 42, I say go for it.

- Steiner

 

Right, I was just making this thread to find out more about the turbo itself mainly and I will probably be calling Sean at A-Spec soon.

Dee

 

We have one on a FD with a large street port and its a blast. The car is like a shifter cart.
This on only 18psi. Also we run 305-25-20 rear p zeros in stock wheel wells and traction
is not to bad. We like this car over any other RX7s we have built for fun factor. What we consider street differs from other people because we run 4" exhaust which is pretty loud,
so is the stereo. Just my 2 cents. Manifold by Sean, ASPEC

Ralph

 

Ralph: Well, I mean streetable as in capable of driving on the street. I don't care about loudness or anything like that. 4" exhaust is fine with me. Can you email me with a little more description about this street car, like the other mods done to the car, so I can get an idea of other things I will need? Also, what exact size ARs does this turbo have, and what are the spool characteristics of it? Any extra info will certainly be appreciated. Thanks in advance.

Dee

 

Ralph,

I got your manifold the other day and started sanding on it. It's a great looking piece and can't wait until it's fully sanded and port matched. It'll look really cool with my custom upper plenum.

I got my GT42 in today and it's going in the car within the next couple of days. I'll send you some pics of the new setup so you can see what you think.

Look at my sig for an old pic of the car....

talk to ya soon,
Elliott

 

silvr94r2: That is a nice looking car you've got there. I can't wait to see the GT42 pics.

Dee

 

at 18psi what kind of #'s were u guys making with the gt42r?