ParadoxToday

Why have I yet to see a FC with twin turbos? Can you explain why? and maybe show me some pics of a TT FC

Evil Aviator

Because you are a noob?

Besides the above, it is a pain in the rear with little gain. Modern ball bearing turbos like the Garrett GT-R series spool so fast that there isn't much point in bothering with two small turbos anymore. If you spend any time in the 3Gen RX-7 forum, you will see that it is common for them to upgrade their twin turbos to a fast-spooling larger single turbo. The 2Gen RX-7 owners can just skip a step and go directly to a fast-spooling single turbo.

Some 2Gen RX-7 owners have installed the Cosmo 13B-RE or 3Gen RX-7 13B-REW in their cars.

arghx

iTrader: (3)

search through Howard Coleman's posts in the 3rd gen forum. He has a custom manifold and runs twin T3/T04E 46 trims with I think .82 A/R hotsides, stage 5 turbine wheels, and ATP internal wastegates

but besides him most people just go single for the simplicity

stylEmon

iTrader: (2)

that engine bay is sex!!

ParadoxToday

thanks i guess

stylEmon

iTrader: (2)

mee too

Evil Aviator

Oh, I guess I should credit the photo since you guys are drooling over it, lol. That is a picture of TitaniumTT's car at the DGRR 2009 event. It is an 88 RX-7 with a ported 13B-RE swap, 13B-REW sequential twins, MoTeC M820 ECU, and AIM dash. He did a really great job with the mil-spec wiring and connectors.

stylEmon

iTrader: (2)

we all miss him!
back on topic tho, I thought there was a guy around here that had a FC motor with 2 stock FC turbos? anyone else remember this or was it a dream?

JxT

iTrader: (7)

Wow, I thought TTT's car was still on stands...unless that was another project. Looks damn sweet.

flipside27

ive seen some people twin charge their FDs
a supercharger+a huge turbo seems to be very efficient on other cars
has anyone here looked in to doing that to their FC?

Evil Aviator

I remember somebody talking about it, but I don't remember if the project was ever completed. It's not such a bad idea for a budget project, although it would not compare to a properly-designed single BB turbo setup.

It is the same car, and he finished it right before the event. He looked pretty tired, and I think his first night at the event was the first time he had gotten a good night's sleep in quite some time. On the good side, his car did win a trophy. I think he won mostly due to the detail work, but apparently it is pretty easy to have a clean engine bay if you put your car together just hours before the event, lol.

Quite a few people have talked about that, but I have never seen one built. I think it would be better to just install a Lysholm type supercharger if you want virtually no lag, a low boost threshold, and efficient high-end boost. The new Eaton TVS superchargers look like a good lower-cost alternative that should come pretty close to a Lysholm's performance.

However, if you look at overall efficiency, I think a single Garrett GT-R turbo is still top dog right now.