It has begun...twin turbo 2010 GT500

[garagelogic]

Originally Posted by darthknight72

Can you give us some info on what magazine your car is going to be in?

Not yet, but soon.

Originally Posted by CamaroSpike23

garage....ever thought about adding methanol/water injection to your combo?

Yes, and I will probably go that route at some point in the future, but not right away. I don't plan to run a lot of boost right out of the gate; probably about 17lbs.

Originally Posted by Ninjak

Custom setup garage ? or is it the Hellion kit ?

Hellion "Hellraiser" compund boost setup.

Originally Posted by toesuf94

I cannot wait to see this thing! My GAWD what a set-up...just do us ALL a favor...let's make sure you don't go full boost and blow the bottom end out of the damned block! That is a lot of forcefeeding for any engine.

Good luck and keep up the information...love your car!

Trust me, I'm going to keep it conservative on the stock shortblock. As I stated previously, while the kit can make ungodly power, I don't plan on running much more boost on the stock internals than I did with the KB setup on my 2007 GT500; about 17lbs, total.

[a_Username]

Yeah I agree, definitely don't want to blow it up lol.

[speedster]

Hey Garage -

Don't know how I missed this one, but great thread. Camaro vs GT500.

A couple of questions about your TT:

Is the theory that the factory blower will handle the low end torque and allow time for the turbos to spool, thus allowing a flatter/smoother curve ?

Is there any problem with the Eaton overheating with so much compressing going on or does the extra turbo air go thru a bypass ?

Don't mean to ask dumb questions, but it's a different technology, so just interested...



Should be one heck of a setup and fool a lot of people looking under the hood at the "CAI going to the blower"...heh, heh

That'll be nice to see in April. Plus, you'll be a celebrity with the GT500 amongst so many Camaros...

We definitely need to take a picture with about 20 Camaros on either side of your car for you to hang in you Garage...

Take Care.

[garagelogic]

Yes, your assumption is correct. Up to a certain level of boost (~20lbs) the factory does not present any restriction, so it makes sense to keep it in place. It will certainly help keep the low-end torque in play, but there really is not much lag with the twin 61mm turbonetics units I am going with anyway.

Here's the dyno sheet of a 2008 GT500 that has the same setup as I am putting on my car:




I have not heard of any overheating issues. Not only does the system use the factory intercooler, but it also comes with a second air-to-water intercooler to help keep temps down. I'd be more concerned with blowing out the seals of the blower at high boost levels than I would be things getting cooked.

[Speedy1975]

So what's the benefit to adding turbos to an already supercharged car rather than just putting a smaller supercharger or crank pulley on the car to generate the boost?

I assume there must be some added benefit or the complexity of the system wouldn't be worth it.

[speedster]

Very nice dyno chart. Once you hit 3K rpm, LOOK OUT !!

[garagelogic]

Originally Posted by Speedy1975

So what's the benefit to adding turbos to an already supercharged car rather than just putting a smaller supercharger or crank pulley on the car to generate the boost?

I assume there must be some added benefit or the complexity of the system wouldn't be worth it.

Well, I look at it this way; the benefit of a compound boost setup is average power and driveability. With the compound setup, I can still have the instant boost and low-end grunt of the stock supercharger (it is making over 400lb-ft of torque @2200rpm in stock form) but I will also have significant power increases in the mid and top-end of the rpm band. This will, in effect, give me considerably more power under the curve.

This is how people with much more experience with turbos and power-adders explained it to me: Let's say that we have a car that makes 1,000 hp peak, but only makes 500 - 1,000 hp for around 3,000 rpm. Now, we have another car that makes 900 hp peak, but makes 500-900 hp for 5,000 rpm.

If we use a linear progression of power to calculate the average power through 5,000 RPM, the second car in question would have an average power output of about 700 hp through 5,000 rpm, whereas the first car mentioned would only have an average output of about 550 - 600 hp through 5,000 rpm.

Using this equation, the first car in question has a higher peak power output, however the second car will most likely out-accelerate it due to the fact that it makes more average power over the same RPM range.

Having already owned a GT500 that made over 700+rwhp at the track, I know all to well how hard it is to launch the car effectively at that power level. While the compound setup may not make any more power than the KB setup did, the way in which that power comes on should only help me get the car out of the hole. That, however, is just a theory that I will only be able to prove at the track.

Does that help?

[brandotron]

Subscribed

[a_Username]

gL and hope your theory works out for ya, I'm no gearhead but that makes sense.

[CamaroSpike23]

Originally Posted by garagelogic

Not yet, but soon.

Yes, and I will probably go that route at some point in the future, but not right away. I don't plan to run a lot of boost right out of the gate; probably about 17lbs.

sweet. keep us updated. is that 17lbs from the turbos or at the manifold?

[garagelogic]

Originally Posted by CamaroSpike23

sweet. keep us updated. is that 17lbs from the turbos or at the manifold?

That's going into the manifold. ~10lbs boost from the turbos plus 7lbs of boost from the supercharger.

[CamaroSpike23]

Originally Posted by garagelogic

That's going into the manifold. ~10lbs boost from the turbos plus 7lbs of boost from the supercharger.

sweet. throw a little meth at that beast and turn it up!

[Speedy1975]

Originally Posted by garagelogic

Does that help?

Yep, that makes a lot of sense. Can't wait to see what she does.

[garagelogic]

UPDATE: The system is installed and the car fired right up and settled to idle with no issues at all. it is going up on the rollers this afternoon to begin the tuning process.