it is possible to twin turbo an inline four.







From what i've heard, it is harder to tune a twin turbo car then a single turbo car. s2k's get about 600hp max, and that can easily be done with one turbo so there isnt much need for two. if you have a supra or skyline however and want to make 800-1200 hp, then twin turbo is a good way of doing it.

 

hmm... there's a LOT of turbo information on here and on honda-tech from people who have designed/built turbo kits and from those who are actually running them. I would highly suggest weighing their advice more than some of the 'other' advice floating around...

A single turbo can make full boost around 2500 rpm. There is a new kit which claims to do exactly that. Details are on honda tech.
www.a-spectuning.com (this is what I'm talking about)
www.lovefabinc.com (also has a kit- similar turbo and should have similar spool/performance)

The T3/T4's work well, but the new GT series are much better. Most of the older S2000 turbo kits use T3/T4's and the newer ones use the GT series. In general, the GT series has quicker spool and more power potential.

Tim

 

this was done a while back. Contact High Altitude Motorports. Here are some pics:

 

if you could put a turbocharger and a supercharger on an Evo, it's possible to twin turbo a 4 banger.

 

I'm surprised no one has mentioned the different type of twin turbo setups. There is non-sequential and sequential setups. The original poster described a sequential TT setup. Great for low end response with a slight lag when the secondary turbo kicks in the middle/upper RPM range. However, they are very difficult to setup correctly (RX7 TT's had TONS of vacuum lines and solenoids.) And most RX7 TT owners ditch the sequential TT setup for more peak power + reliability. Supra TT owners making big power are usually running a huge single or two big aftermarket turbos in non seqential setup.

Non-sequential is much easier to setup but honestly, its better to just stay single turbo.

 

it's called a bi-turbo...one spools up quick then when it maxes out the other kicks in and ups the boost!

I say it's best of both worlds when tuned correctly...

edit: this wasn't in response to the post above but it looks like it Sequential is what I was getting at! I think it's a great setup, like in the good ol Audi S4s.

 

rx-7 FD is the first mass produced sequential turbo car from japan.

just a quick factoid.

 

</div><table border='0' align='center' width='95%' cellpadding='3' cellspacing='1'><tr><td>QUOTE ( @ Apr 25 2001, 07:39 PM)</td></tr><tr><td id='QUOTE'> Twin turbos? Intercooler? That is the easy part.

The hard part is the Fuel management system. If you want to have decent driveability, someone has to design a "mass airflow" type fuel system for the car. This is the kind of fuel system every modern turbo car has.

Also, since you are spending big bucks, I would also lower the compression ratio to 8:1 or 9:1 so you can run alot of boost. I figure 20psi should give you about 350rwhp.

Hehe




"speed is a question of money. How fast do you want to go?"
-strange mechanic from "MadMax" [/QUOTE]
I make 350 at 7psi.

Why do you need a smaller turbo to spool? You can have the EMS spray nitrous into your intercooler around 3K to give you power there.

 

Wow, 6 year old thread - I didn't even notice it at first.

 

intercooler sprayer don't work. They only work because some of that spray gets into your intake.

the part you actually need to spray with intercooler spray is the upper intercooler pipe to be effective.