someone posted this in the "what's on your mind" thingy at the right side when got to forums...

you guys deserve a look in case you missed it. my mind is blown...

http://www.youtube.com/watch?v=xOs6UI1YDXI&NR=1

 

Holy crap. It's like riding a missile with a steering wheel. Sweet mother of darkness!

 

650 hp? Makes an Atom useless doesn't it?

 

The video was a letdown. I was expecting more honestly. Was he even pushing the thing? I heard the engine get loud a couple of times, but it wasn't the kind of violence I expected from 650HP in what is basically a motorcycle. Agree with Saki in that 650HP is probably too much in this thing.

 

well im not an expert on the k20 engine as ive never had one, but Id guess that its similar to the F-series, where it makes the 650hp at the top of the powerband? Plus listening to the video, sounds like it has a big turbo in it, so it probably has a bit of lag, and the power doesnt start surging in till hes at a higher speed, making him be able to put it down better.

Either way, I agree, putting that much power like that in a street car that light seems stupid, accidentally getting on it could be fatal on the streets if he were to spin out into oncoming traffic

 

Check out this video of that car:

http://youtu.be/zUl-4BPLgfQ

Gives a better picture of what it's like.

 

Well here goes the BS meter.

If you look at the tach and your ear, it sounds like he has full boost for about 3000k to 3500k RPM's. Assuming he is reving to 7500 RPM or even 8k RPM, he is getting full boost from 4500 to 5000 RPM. Meaning he has a turbo that is the size of a GT30/76R....and MAYBE could have a GT35R but I don't think so.

Knowing that the one video says 650 hp on 20 psi of boost. NOPE MY FRIENDS! THAT RIGHT THERE. No GT30R or GT35R is making 650 HP reving out like a stock k20 does. To claim 650 hp in a front engine platform transmission with only about 15% drive train loss, you basically saying that your making 550 wheel on 20 psi.


I don't think so. I would bet the car is more likely running a GT30R sized turbo so at 20 psi its making around 400-420 whp.


Is that car fast....you know it. But to say 650 hp. Doesn't the number just sound a little to perfect :-)
You think saying a number like 653 hp sounds like its actually accurate.

JR

For reference. I weight 1638 pounds. I have so far only run the car on 13 psi of boost and I ran a 12.4@115. The turbo is a twin-scroll GT30/76R but it doesn't spool till 4800 RPM since I can't really put any load on the car because I don't weight anything. In 4th gear I can get 13 pounds by 4500 rpm but that is about it.

In 1st gear I can only make 4 psi at 7300 RPM by the time I shift.
In 2nd gear I can get up to 13 PSI

Video:

http://www.youtube.com/watch?v=EFYa0oyAMM4

 

its actually 500 hp.

Here is the link to the guy who built the car.

500 hp

 

I'm not disagreeing with you that 650 doesn't sound right, but the amount of power you make at a certain PSI isn't determined by the turbo. It's determined by the engine. NA pressure is 14.7 PSI. Assuming no decrease in efficiency due to the increased pressure (aka virtually impossible and the high end limit to how much power could be made), (14.7+20)/14.7 * 245 hp stock = 578.33. So it's still impossible, but it has nothing to do with the turbo selection (unless the GT30R/GT35R can't handle 650hp).

By the way, the engine makes 245 hp at 8200 RPM, so redline is probably a tad higher than that.

Edit: Motec ECUs/Displays have customizable tachs. You can have your tach start at 2,3,4,5k, etc. and stop anywhere you want. It looks like he's cut off part of the bottom of the RPM range as shifting from 2nd to 3rd drops by tach by more than half, which isn't really the expected ratio in a 6 speed. Basically, the tach is garbage for juding whatever RPM he's at.

 

I agree with what you said on power which is why each time I said the power I used the words: " on a 2 liter" , since displacement and rev range has a HUGE role to play in HP that a certain turbo can produce.

And I disagree with your comment on " it has nothing to do with the turbo selection" BECAUSE IT HAS EVERYTHING TO DO WITH IT. But lets not mess up this thread talking about this and how PSI doesn't equal CFM and blah blah blah. Checking out of thread so I don't hijack it. PEACE!

JR