Carlintexas:
But with a minor upgrade of the exhaust system it is now:
238/248+ so you may want to get the check book out and go for stage III.
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I overlayed the gxp/redline plot(its not perfect but close enough ) over the hahn stage 2 dyno plot, now its much easier to compare and the scaling is the same as the hahn plot.
Voice of cheif wiggum.
Thats some nice overlayin boy.
It appears there is more area under the curve, during a race with the Hahn kit. As to be expected with an aftermarket turbo swap. Especially if you wound it out.
It would be a drivers race to be honest. The GXP would compare once that person could lay down a nice 1.9 60 foot or less.
Why are people even arguing the Crank Horsepower? That number is mostly worthless. Just that a Dyno Queen Number. The number to worry about it the number that hits the ground.
And as stated above....The Hahn Stage 2 vs. the Redline or GXP would be a drivers race.
Carlintexas:
But with a minor upgrade of the exhaust system it is now:
238/248+ so you may want to get the check book out and go for stage III.
Come on LV! Look where Carl is from! TEXAS! We do everthing bigger here! He already has the exhaust and just like the rest of us here wont stop till the parts do!
Losses - One thing everyone is forgetting, the drive line losses are fixed. If i look at a Mallet in the solstice, the percent losses are going to be a lot less versus a NA 2.4. The losses on a 170 hp engine have to be at least 20%, therefore, the GXP will be a bit less.
If we say the losses on the 2.4 are 20%, that would mean the driveline eats up 34 hp. Those same losses on the GXP would be less (34/260). I am not saying the losses are exactly 20% on the NA car, but, they will be less in the GXP than the NA version when pushing the same car. Just one more point the difference in the gear ratio will show 1-2% higher losses in the GXP.
I'd like to offer that in every instance we've had related to us of a Hahn-equipped 2.4 car facing off against a stock GXP, the Hahn car is the clear victor.
Now, once the Hahn-equipped GXP's are more prevalent, this will obviously change. But for the comparo basis of the standard 2.4 with Hahn Stage II Turbo against a standard GXP, the question's been answered.
__________________
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It is widely believed in Miata cyberspace forums that the drivetrain loses 26 hp. Not a % as such but a direct loss that doe not change when bhp changes. The proof was a test using an engine dyno v. chassis dyno on the same engine for both an NA version as well as a turbo FI version. Bothe cases lost about the same hp (I think within 2 hp or so). That being the case, the drivetrain loss as a % gets less on the same car as hp goes up. I am probably not remembering all the details but you get the drift.
Wow, only one person ever commented on this. This was a fake dyno. Every dyno graph crosses at 5200 rpms. Hahn's crosses it so why didn't theres?? I think the torque figures are extremely off.
After looking at it, drop the line down to where it would have crossed 5200 rpms and you'll see that it would have been making 225 just like the horsepower. Makes much more sense coming from an engine that makes the same hp as tq.
) over the hahn stage 2 dyno plot, now its much easier to compare and the scaling is the same as the hahn plot.
But for the comparo basis of the standard 2.4 with Hahn Stage II Turbo against a standard GXP, the question's been answered.