Hello. I Dont post in the 3rd gen forum much, but had a question I thought would be better suited to be answered by you people. For the past year or so I have been dumping a ton of money into my FC. I have a fairly large single turbo setup, fully divided tubular manifold, external WG, etc.. My car isnt together and running as of yet, so Im really not sure what to expect from it. I know I will be in the area of 400 RWHP. As of recently, I have the oppurtunity to buy an aftermarket twin-turbo setup for my car. Its a very old kit marketed by FEED, using dual Greddy(Mitsu) TD-05 turbos. Since alot of you have experience with both larger singles ,and a dual setup, which would you recommend? I would figure that even if I dont make quite as much peak power with the duals, I would have alot flatter power and torque curves, with quicker spool. Being run non-sequential (obviously.) I wouldnt have the headaches and vacuum nightmares that some FDs suffer from. Just looking for some suggestions, and reasons, as I need to make a decision soon. Thanks alot!

 

running the twins non-sequential wouldent be worth the swap... the only reason to do twins would be to run sequential, or try to make GOBS of power. you will be better off with the single, and spool up should be quicker.

 

Twin turbos would really be similar to a single, but just with a lot more plumbing . It would be more like a 3rd gen with a full non-sequential setup. You may gain some quicker spool, but not a whole bunch. The whole trick to the 3rd gen's stock amount of low-end grunt is the sequential system.

Which is better? Hard to say. The twin turbos willl likely be more work - you've doubled your failure points.

Dale

 

I would assume that with 2 smaller turbos (whether or not running non-sequential) they would spool up faster than a larger single, am I wrong in that? I realize it would be a bit more work for the plumbing, but if the end result gets me a significantly more responsive car, I would think it would be worth it.

Just for comparison sake, for those with larger singles ( My TD-07 is about equivilant to a T04B 60-1), when do you see full boost? I have a large streetport & very big FMIC.

(BTW - That's my turbo in my avitar, its fairly large )

 

I'd leave it single. Easier to work on and you only have one turbo to worry about if something goes wrong - not two.

 

Actually, a 60-1 is pretty mild for a rotary. I used to have a 60-1 HiFi in my 10th Anniversary. Had a smooth ramp-up of boost, full boost by about 4000 RPM. Car was just SCARY fast with that turbo.

Might want to PM Kevin Wyum - he built a fully custom twin-turbo setup a LONG time ago, stainless manifold, two wastegates, etc. He could probably give you a good answer. We can really only guess and give conjecture as to whether it would be worthwhile - thing with turbos is you either have to do some serious math or really try it on the car to see how it would do - what the spoolup would be like, power, etc.

Anyhow, I was VERY pleased with the response and power from the 60-1. I can at least tell you that for a fact .

Dale

 

Of course results depend on the particular sizing of turbos etc. but sized appropriately with equal layout two smaller turbos will spool faster, flow the same amount of air and run cooler. The two smaller twins will always outperform larger singles when the work is of the same quality except in the categories of cost and complexity.

Kevin T. Wyum

 

Thanks for the replys. I still need to think about it, but I probably will just stick with my single. A twin-turbo'd FC would still be pretty cool , dont see very many done that way.

 

Good luck with the FC, Post
some threads when all done.
With Dyno numbers.

JP

 

Thanks, I definately will. From a few people Ive asked, and a bit of research Ive done, TD-05 twins should be good for close to 500 RWHP, and should spool decently ( at least not any worse than a large single with comparable output. This kit also includes an intercooler and all necessary piping, and oil lines, etc, so I wont have too much trouble with it. I think Im going to give it a shot, but keep my single in case it doesnt work out.