[RUgoinUp]

Ok, what would you guys think about adding another turbo to the SRT-4.

Let the games begin!

 

[Jonathan]

1) Pointless
2) Frivolous
3) PITA to tune
4) Weighs more
5) Costs more
6) Stupid

Inline motor configurations are perfectly suited to single turbo applications. Showy bling-bling would be the only reason to even attempt such a fantasy.

 

[Exhaust Depot]

YOu dont have enough volume to turbos at the same time. The MKIV supra and the Nissan Sky line both have 3 runners spooling 1 turbo.

On the srt you wil only have 2.

 

[ohyeahwright]

Even if you could, where the hell would you put it? That engine compartment is stuffed! I agree with the idea that it would be a major pain in the ass...

 

[RUgoinUp]

Someone was gonna bring it up eventually so I figured I would get it out of the way.

Twin Turbo SRT-4, R.I.P

 

[Second Chance]

You could always add a super charger and use it down low then turbo for the rest of the rpm range. But if you have that kind of money whats with the srt.

 

[lifeisdeath]

hmmm, in a very recent magazine article they were using sequential turbos on a 4 cyl. it might have been one of the turbo mags... turbo and high tech, or something like that.

 

[Desmo]

U can have both supercharger and turbo at the same time???Never heard of that :shock:

 

[boostedneonsrt4]

actually it was in turbo magazine....and it was a v6 powered mr-2 had supercharger and turbo.........like 500 hp to the wheels or some crap lol

 

[lifeisdeath]

im not talking about the supercharger/turbo set-up. i am talking about sequential turbos. a small turbo mated to a large turbo.

 

[mm3srt-4]

that is funny. 2.4l twin turbo

 

[SRT stunna]

U could set it up sequential style. Which is smaller turbo feeding a bigger turbo.

 

[SVTfocus]

You can get the same amount of boost out of a single turbo than you can running twin turbo's, the only reason for a twin turbo setup is for room. Many people don't realize this.

 

[PB Pod]

I am not an expert, but here is my understanding. There are a number of reasons to run twin turbos or a turbo/supercharger combination on small motors. The classic example of a twin turbo a small motor was the RX-7.

With only one turbo you must choose small, medium, or large (I know this is a drastic over simplification.) With a small turbo you get fast spool up for more power down low, but it poops out at high volume boost production for the big HP numbers. A big turbo makes the big power but it takes longer to spool up so low RPM oomph is missing. Many FWD guys use these on small engines because they have no traction anyway so it helps them get out of the hole. Once they hook up the big turbo kicks in and they are off. This is why you see some big HP numbers at high rpm and low torque figures at the low end and mid range.

Medium is a obviously a compromise. The variable vain turbos of the late 90s were an attempt to have a turbo act small at low RPM and then act large at high.

The RX-7 used sequential turbos in small and larger size to get the best of both worlds.

In the mid 80’s Fiat and Lancia used turbo/supercharger combinations successfully in World Rally cars during the infamous HP race in the Group B rally cars. They were known as the Killer Bs. Lancia actually won the championship with this combination in their Delta S4. http://freespace.virgin.net/shalco.com/lancia_S4.htm

There are other examples, but I have written enough.

 

[SpitterGuy]

I would have no opposition to a twin turbo because one turbo can compensate for the weakness of the other. The only problem is where to put it in such a restrictive area... :idea: Now if some one could produce a setup that is the size of one turbo, but functions like a twin setup, that would change the whole scene of turbo power! :shock: Any dedicated engineers out there?

 

[Kyle]

I would have no opposition to a twin turbo because one turbo can compensate for the weakness of the other. The only problem is where to put it in such a restrictive area... :idea: Now if some one could produce a setup that is the size of one turbo, but functions like a twin setup, that would change the whole scene of turbo power! :shock: Any dedicated engineers out there?

Its been done before. VNT turbos do just that.
http://www.egarrett.com/technology/tech_vnt_pv.jsp?justlist=1&l1id=1&l2id=2&l3id=3
http://www.mercedes-benz.com/e/cars/e-class-t/facts_m2.htm

 

[SpitterGuy]

That's awesome, I never knew they existed, it's cool how they work! Too bad they don't have it for gasoline engines yet, atleast they're working it Thanks for the link!

 

[Kyle]

They do use them on gasoline engines. Dodge sold VNT equipped gasoline cars in '90, give or take a year.

Many Bell Engineering turbo kits have used Aerodyne VNT turbos.

 

[SpitterGuy]

Hmm, interesting. Obviously I haven't heard or seen anything about them till now. Wonder why they aren't so popular and why the aftermarket hasn't pickedup on it much (if they haven't already).

 

[PB Pod]

They have not gotten popular because they take up too much space, they are too complex, and they are too expensive. Remember that the Lancia was mid engined with lots of space around the motor; it was factory engineered and factory sponsored so none of the caveats above mattered.

A twin turbo or a turbo/supercharger for the SRT would be impractical, but it was an interesting thread.