Would a twin-turbo respond well in the V6?

[PD123]

I plan on putting on aftermarket junk when my warranty is expired. (or close to it)

[ZeeTwentyFour]

I suppose anything is possible with time and money. I imagine any kind of boost, be it single, double, or super charged will make this engine even more of a beast. The 2.0 turbo 4 cylinder is DI. Hopefully by the time your warranty is expired the ECU will be cracked. This means a turbo will be much easier to mate to the engine and tune. I wouldn't throw just any junk on this world class motor however

[CamaroSpike23]

Originally Posted by ZeeTwentyFour

I suppose anything is possible with time and money. I imagine any kind of boost, be it single, double, or super charged will make this engine even more of a beast. The 2.0 turbo 4 cylinder is DI. Hopefully by the time your warranty is expired the ECU will be cracked. This means a turbo will be much easier to mate to the engine and tune. I wouldn't throw just any junk on this world class motor however

the trick is dealing with the high compression ratio that this motor has. altho the fact that it is DI, I would imagine it would take a lot of boost without issue.

[ZeeTwentyFour]

yea, the DI thing is a tricky issue, but just look at the cobalts and sky/soltice motors. I pulled this from a GM spec sheet

"The turbocharger generates maximum boost of 20 psi. Because direct injection cools the intake process compared to port injection, it allows the 2.0L Turbo to safely operate at higher boost and higher compression (9.2:1) than a conventional turbo engine, increasing both output and efficiency."

It's only rated at 87 octane, so that gives you more room to utilize higher octane if necessary, like when using boost. I'd say just look around on forums like cobaltss.net or sky/soltice forums and we can get an idea of what we need to boost the LLT.

[CamaroSpike23]

Originally Posted by ZeeTwentyFour

yea, the DI thing is a tricky issue, but just look at the cobalts and sky/soltice motors. I pulled this from a GM spec sheet

"The turbocharger generates maximum boost of 20 psi. Because direct injection cools the intake process compared to port injection, it allows the 2.0L Turbo to safely operate at higher boost and higher compression (9.2:1) than a conventional turbo engine, increasing both output and efficiency."

It's only rated at 87 octane, so that gives you more room to utilize higher octane if necessary, like when using boost. I'd say just look around on forums like cobaltss.net or sky/soltice forums and we can get an idea of what we need to boost the LLT.

what is the cr on the cobalts/sky/solstice motors that are fi tho?

[ZeeTwentyFour]

most older non-DI Ecotec engines are 9.5:1, but the 2.4 in the solstice/sky is 10.4:1. The new 2.2 is 10:1. The next 2.4 DI that will hit the market will be 11.4:1.

[CamaroSpike23]

Originally Posted by ZeeTwentyFour

most older non-DI Ecotec engines are 9.5:1, but the 2.4 in the solstice/sky is 10.4:1. The new 2.2 is 10:1. The next 2.4 DI that will hit the market will be 11.4:1.

normally you want a lower cr with FI. but with it being DI, I think it will be safe running boost. hell, ive seen diesels with 35:1 cr. but they are designed to run by detonating...

guess we'll have to wait and see

[justmeron]

I am not a mechanic but could the auto tranny handle it? Or would that also have to be upgraded?

[fazm]

time will tell

[Mr Twisty]

The compression ratio is 11.3:1 already, that's pretty high.

[zebra]

Originally Posted by justmeron

I am not a mechanic but could the auto tranny handle it? Or would that also have to be upgraded?

if you're gonna be putting out a bunch more power (400+), you'll most likely wanna go with the 6L80 (if it'll mate up). i don't know the torque rating on the 6L50, but i'd say it's a bit less than what a TT LLT would be making

[CamaroSpike23]

it'll hold 500ft/lbs

[Mr. Wyndham]

Originally Posted by MisterCamaro69

The compression ratio is 11.3:1 already, that's pretty high.

But with Direct Injection, that issue becomes somewhat less important that it usually is...

[Xanthos]

Originally Posted by Dragoneye

But with Direct Injection, that issue becomes somewhat less important that it usually is...

Yes. I'd say that if the LNF can hold 20 lbs of boost at 9.5:1, we should be able to do 5-7 at 11.3:1 without issue.

Although, I have to say that my setup will probably be 10:1 at 7 psi.
- Xanthos