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TT vs Single turbo?
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Posted by: IROC_ZO6

on a v6 4.3L what is going to be a better setup for MASSIVE bottom end torque? single stock turbo, or 2 smaller turbos on each manifold? opinions?

Posted by: IMSA

Smaller twin turbos will reduce turbo lag if you can get them to work.

IMSA

Posted by: MadScientistMatt

The number of turbos is not as important as correctly matching them to the engine's airflow needs at low RPM. Either one can work well for stump-pulling torque, although you'll have a bit less lag with two small ones.

Posted by: Tang

A lot of the Pro-5.0 racers run a HUGE single unit, so I'm guessing a twin setup is mostly for more torque on the street.

Posted by: Mr. P

the comment about turbo lag is probably right on.

however, twin turbos give you essentially "twice the heat, twice the expense, twice the tubing, twice the work, twice the headaches, and a complicated intercooler situation. Unless you just won the lottery, better go with a single setup and do it right.

Then, once you get the TT system working, you always have the joy of having one of them out of balance with the other.

Mr. P

Posted by: Starquest aka AndyR

single turbo. and not a big one. turbo lag is caused by big turbo's or not enough exhaust pressure to get them going. a small turbo would light right up, but then it would die at higher RPM's. a bigger turbo would take a little while longer to spool up, but the top end would be awesome.

or you could do what alot of racers do and get a nitrous system that is used to create power off the line and set the nitrous to stop spraying when the boost hits a certain level.

and even more complicated would be a super charger turbo setup... a super charger that is clutch driven that would run at idle, but when the boost started to exceed the pressure on the supercharger (if the super charger is set to 5 lbs, set the clutch to disengage when the boost gets to 7lbs via a pressure switch), you have the clutch disengage and the turbo takes over from there.

forget twin turbos, they are over complicated and not good cost/benefit.

Posted by: Starquest aka AndyR

or.... and I forgot about this...

get a big ball bearing turbo. the ball bearing units spool up much faster than a conventional turbo, so you could really have the best of both worlds.

Posted by: merczephyr

Or you could play with a sequential turbo setup similar to what the last generation Supras had (I thnk it was Supras). A smaller, quicker spooling turbo is first in line blowing into a larger slower turbo, getting it to spool quicker than it would by itself. It'd be a pain to get right, but once you did, it'd probably be pretty bad ass.

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