I haven't made any changes to the car sinse the last post but a few of us decided to drive from Tulsa to Oklahoma City and dyno (a little over 100 miles from my house to the dyno). It was more just for the hell of it than anything. Anyway, we dynoed a friends 03 Cobra. I don't recall what he put down on his first pull but on the next pull, we decided to freeze the intercooler with nitrous. That netted him 581 horsepower and 620 something ft/lbs of torque.

Weeeellllll, we decided to try it on the Z. First pull only netted me 450 something horsepower but I didn't turn my booster pump on. I guess I forgot. Oh well. On the second pull we froze the hell out of the intercooler with some nitrous and dynoed it. That little experiment netted 553.9 horsepower and 577.5 ft/lbs of torque at 8psi of boost (still on an internally stock LT1). These numbers are STD. The SAE numbers were 544.1/567.3. Bear in mind the nitrous was sprayed on the outside of the intercooler not into the induciton track. In anycase, it was just for the hell of it but I am going to build a few intercooler coolers and test them out on the track probably using CO2. If I recall, C02 gets colder on decompression and it's damn sure cheaper than nitrous. We are going to try it on his Cobra as well as the Z.

I'm testing a new blow off valve and working out some more bugs. This kit will be perfect when it's done!

 

Nice to see you there! Execellent numbers.

 

I'm just wondering what is it about your turbo kit that allows it to make over 150rwhp over, say, an 8psi ATI kit, or a Turbo Tech kit. It just seems kind of high.

 

Volume is more important than pressure. Supras are a perfect example. They can all run 15psi, and make from 350rwhp to 700.

 

hell yea

 

What turbo are you using?

 

I wonder if that's the record for an internally stock LT1?

 

It's closest to a big shaft T72 from turbonetics.

 

damm!!! thats some pretty impressive #### for a stock motor with stock tuning... how long do you think that motor will last?

 

I was trying my hardest to stay out of this, but I just can't help but point out that I think that TurboSpeed is [once again] leaving out a little information.

580 rwhp on an '03 Cobra by "freezing the intercooler"??? C'mon, guys!!! Those only make 380 rwhp, give-or-take, stock. So cooling the intercooler netted a 50% gain in rwhp? Don't think so. I'M NOT SAYING THAT IT DIDN'T MAKE THE NUMBER, ONLY THAT ALL IS NOT TOLD.

Secondly, the '03 Cobra has a water-to-air intercooler (just like my Lightning), not air-to-air. So, if the intercooler is "frozen", then the cooling media can not travel to the under-blower exchanger to cool the boosted air.

I've heard of people putting cold water in the system, even adding ice, but spraying nitrous on the outside of the intercooler radiator seems to be about the most 'round about way to cool the boosted air.

 

Mikael, it is important to have a turbocharger large that will flow enough cfm for your application. This can be seen in 2G Eclipses and MR2 turbo's. If you raise the boost on the stock turbo, you will quickly find that the boost falls off at the top of the rev range. This is because the compressor will not supply enough cfm air to hold boost at high rpm.

However, one you have a large enough compressor to make full boost to redline, the only advantage of a larger compressor is that it will have a higher efficiency. This will lead to lower discharge air temperatures and more power.

If you have two identical engines. You put turbo's on both. Engine "A" has a very large turbo that makes 15 psi boost and operates at 73% efficiency. Engine "B" has a smaller, but better designed turbo that also makes 15 psi boost and operates at 73% efficiency. These engines WILL make identical power. However, if these engines are large and you spin them to a very high rpm, then engine "B" may reach the capacity limit of its smaller turbo. This will be seen in the form of decreased boost. In this case, the larger turbo'd engine "A" will make more power.

The point is that if two identical engines have the same pressure, temperature, and composition (e.g. no N2O) inlet air, they will make the same power regardless of compressor size or intercooler choice.

Mike

 

ROFL, engineermike is back! You had a pretty good idea when you said you were trying hard to stay out of it. Go back in the corner and keep trying. You aren't going to turn this into another 11 page flame fest like the last one. You got a chance to put your money where your mouth is, you didn't take it. You have no credibility.

I'll indulge the poor folks stuck reading your flames this once. You are trying so hard to find something but you keep failing. I never said the Cobra was stock. It has a pulley, full exhaust and a 50 shot. There was ice in the coolent tank. Freezing is a subjective term. When he made his pull, I sprayed what was left of a 10lb bottle through his heat exchanger. I just gave the numbers because I thought it was cool. Hey Mike, I think he gaps his plugs aronud .30 or so.

Just because you are incapable of doing something doesn't mean it can't be done. Sooooo, in the interest of those are curious about the project and those who don't assume everything anyone ever says is a 1/2 truth or a bold lie, **** off and try to create something of your own...

 

I said:

So he says:


So I guess I hit the nail on the head.

And freezing is not a subjective term, Mr. Clinton. It's frozen or it's not.

 

hehe, calm down girls. do you want this place to look like ls1.com ?

 

Actually, you said:

and I said:

then I went on to say:

I guess you are the Clintonite, not I. You claim to be an engineer. I doubt it but unlike you, I'll give the benefit of the doubt. See if you can get those rusty cogs turning enough to understand that spraying nitrous through a heat exchanger would cool the cooling medium more than ambient air. Cooler cooling medium means cooler intercooler which cools the air charge. Cool concept isn't it?

You've been owned. And I'm now done with you.