not sure if this is the right forum for this since I am new here but....

Is it possible to adapt a 3rd gen TII setup to a 2nd gen? mostly talking about the lower end (manifold, turbos, etc..) Or even a single turbo from the TII? I am only interested in running about 10psi on the cheap.

I have a 1990 RX-7 Vert N/A, but I should not have a lot of the same issues with putting a turbo on a N/A since the N/A wont actually be in an RX-7 but in a custom built chassis.

 

Not sure what exactly you're asking here, but there was no 3rd gen TII. All 3rd gen were turbo, and all TII were 2nd gen. If you are asking if TII manifolds/turbo will fit a 3rd gen engine, they won't. Some people make adapters for the 3rd gen UIM to fit the TII LIM but that is about it. Check out aaroncake's page about turboing an N/A, he covers pretty much everything about it.

http://www.aaroncake.net/RX-7/naturbo.htm

 

some what i'm getting is... your putting this new turbo engine into something else. although you think it may be simple, your gonna do lots of fabrication to turbo a NA. if you wish to do it with a different intake/exhaust manifold too, the same applies.

its all about port matching and fittings.

 

yeah, basically I have an S5 RX-7 N/A engine and drive train that I am going to be building a frame around. I am already building chassis and a bunch of other stuff for a car, so some manifolds or adapter flanges or what not wont be much more.

I found a good deal on a twin turbo setup (turbos, manifold, bov's, oil lines, etc..) that the seller claims is from a 3rd gen RX-7.

And I've already read http://www.aaroncake.net/RX-7/naturbo.htm from start to finish a few weeks ago.

 

if your build a full chassis race car, the 3rg gen turbos manifolds, ect. are not a good choice. and if your specind the money to build this all the way up. theres many better motor choices than the 6 port NA engine.

but much power can be had out of a 6 port turbo. but it still remains the stock 3rg gen turbo set up is no good for this. you much better off with a small after market turbo set up. and if your one of those people who must have a twin set up. i seen somone make a set up with 2 GT25 (sr20 turbos). it made real nice power and boosted quick. one turbo per rotor.

what are you building this car for? what kind of chassis is it?

 

To clarify for you, TII or Turbo II is not the same as twin turbo. TII refers to USDM 2nd gen single turbo 13b RX7s, while all 3rd gen RX7s used the 13B-REW twin turbo engine.

As mentioned already, 13b-REW parts don't bolt up to 2nd gen 13b engines without adapters and modifications. The exhaust and intake port locations and sizes are completely different. Don't bother with the twins off of a 3rd gen; a good single turbo will be much easier to set up, and depending on your use, it can be better.

 

ah, gotcha.

Thanks all for the help and clarifications.


No, I don't have to have twin turbos. One should be plenty. I am building a Lotus/Caterham 7 clone. http://lmgtfy.com/?q=lotus+7 finished car should weigh around 1300lbs wet (without a driver). So the 160HP the stock N/A puts out should be quite enough without a turbo. Like I said in the OP, I am only planning on running about 10 PSI if I can find a cheap turbo to put on it.

 

Ah, ok. That sounds like a fun project. Aaron's writeup has a lot of info on building a 6-port (NA engine) turbo, but there are some other links in the FAQ, as well I think. Then there are plenty of other threads on the subject you can sift through. A stock turbo from a TII should only cost you around $100-$200, and will make the engine capable of making almost double the power it makes stock. That should be more than enough for a 1300 lb. car.

 

ok... im actually buildind a lotus 7 also. (locost)

im using the rx8 engine right now, but might be swapping to a TII because the stock turbo manifold and turbo, quiet down the motor a lot. and with the short exhuast on an NA, the noise is ear piercing.

 

5 PSI, 10 PSI, 20 PSI, all meaningless unless you know what turbo you are going with.

Packaging is going to be the greatest challenge in something like a Locost. Heat rejection seems to be an issue with the rotary and doubly so with a turbo rotary. You need to find room for a large radiator, oil cooler and an intercooler as well as the turbo hardware.

The stock turbo, while old and designed 200 years ago with stone tools, will do around 240HP at 10 PSI which most certainly should be enough for a Locost. It may even be possible to fit the stock top mount intercooler which will minimize the amount of plumbing. In this case, port the TII lower intake to match the 6 port engine and use all TII stuff to bolt it on.

 

I have no idea what turbo I am going with. I know HOW they work and the principles and stuff but I know almost 0 about the difference between a T3 and T4 or an 'ABCD-8'. Is there a faq somewhere on the internet that explains that? I couldn't dig up anything useful on the Google after about 15 mins of looking.

I have seen you can get a T4 for instance, but you can get different flanges or a T3/T4 setup... wtf is that?

I am building a McSorley +442 for those of you familiar with 'locosts', so space will be a little less of an issue, plus the rotory is such a tight little package. It will be swimming in the engine bay.

Again, thanks all for the helpful posts and comments. Ya'll sure know how to treat a noob right.

 

And if it helps.... I don't think I want any more than about 250 HP at the rear wheels and the turbo to spool quicker.

 

go with a stock turbo setup. will get you plenty of power on a stock turbo and a stock engine. stock s5 turbo with a stage one from bnr is all you need.

 

T3 and T4 refer to frame sizes for a family of turbos. As the number increases, the size of the turbo increases. Generally speaking, T3 turbos are too small for the rotary. Hybrid T3/T4 turbos are a mix between the two, usually a T3 turbine with a T4 compressor. Some are of use on the rotary (like the GT35).

Sweet.

Stock turbo it is then.