Dyno'd earlier this last week. Ive been in AZ at the Barrett-Jackson all week. Will post the dyno sheet and some video this coming week. We made this power on about 15 psi and 100 octane fuel. should push over 1200 rw hp with better gas and some more boost.
Or if your system design allows it... swap the current turbos out for larger ones, and make your 1200+ RW on the same PSI :thumb:
That is not always the case. It's funny watching everyone jump on this "bigger is better" bandwagon. What happens to your power curve when you do so.....John is building street motors that see "street" rpm's, with usable power curves, not race motors that rev to the moon....his motors come with a warranty.
Same goes for cubic inches- bigger is not always better for certain turbos. They must be matched for the application. I've seen a T-76 tap out at a little over 660rwhp on a 6.0L LS1, and seen the same turbo hit over 900rwhp on a little 3.0L. Obviously the 6.0L had a more impressive torque curve but it choked the turbo. The 3.0L with the T-76 was a properly matched setup that was much more efficient for that turbo and would basically run away from that 6.0L all day long.
What he said There may be a little left in it from jumping up in size (depending on whats in there now) but making a grand at the rear wheels on 15psi isn't bad. The closer you get to that 1:1 pressure ratio you get diminishing returns and a shitty useful power band, aka supra.
Hmmm, wonder if Dean will let us borrow the turbo off his D11, that thing has a 19 or 22L CAT diesel with a turbo the size of a small block chevy It should make 1500hp at 4psi on pump gas :redbeard2:
Just cause I like a good discussion I'll contradict myself. I personally think vipers should START with a good size GT42 and most would like a 76 (for twins that is). Why might you ask? These things don't need to make 15psi at 1400 rpm, I like to drive my car with out roasting the tires at 1/4 throttle in 4th gear. They make 500ft/lbs N/A, you don't need much, if it doesn't spool till 3000 rpm thats just fine with me. Only problem is your HP doubles in 400 rpm.
On a side note, hows that 600ci motor coming along? It sounds neat but damn .100" between cylinders on an engine that powerful scares the piss out of me.
Just cause I like a good discussion I'll contradict myself. I personally think vipers should START with a good size GT42 and most would like a 76 (for twins that is). Why might you ask? These things don't need to make 15psi at 1400 rpm, I like to drive my car with out roasting the tires at 1/4 throttle in 4th gear. They make 500ft/lbs N/A, you don't need much, if it doesn't spool till 3000 rpm thats just fine with me. Only problem is your HP doubles in 400 rpm.
On a side note, hows that 600ci motor coming along? It sounds neat but damn .100" between cylinders on an engine that powerful scares the piss out of me.
Rogue, are you sure you want to go that big on the turbos?
I personally hate turbo lag......
Just kidding! I agree with you on the sizing and also the slope of the torque curve for driveability.
That is not always the case. It's funny watching everyone jump on this "bigger is better" bandwagon. What happens to your power curve when you do so.....John is building street motors that see "street" rpm's, with usable power curves, not race motors that rev to the moon....his motors come with a warranty.
Same goes for cubic inches- bigger is not always better for certain turbos. They must be matched for the application. I've seen a T-76 tap out at a little over 660rwhp on a 6.0L LS1, and seen the same turbo hit over 900rwhp on a little 3.0L. Obviously the 6.0L had a more impressive torque curve but it choked the turbo. The 3.0L with the T-76 was a properly matched setup that was much more efficient for that turbo and would basically run away from that 6.0L all day long.
But I'm sure you knew all that anyways....
Rollmodel, I am sure John is doing a stroker motor on the new coupe so he has even more cubes to spool the turbos.
With the street motor theme in mind, it would be better to make that power on 10 PSI than 15 don't you think?
A nice pair of 71's or 76's with a .96 hot side would probably hit peak torque at around 42-4400 RPM. The torque curve would have a lesser slope and the car would be much easier and more fun to drive on the street unless you like blowing the tires off the car when you breathe on the gas pedal!
That was the wrong combination of a T-76 on the 6.0L LS1 for sure. It must have had one heck of a small AR on the hot side with probably a tiny P-trim turbine wheel. If they put a GT42 or GT47 with a decent AR with a nice 4" or 5" exhaust, with a decent tune, they should be able to make 900+ RWHP no problem at relatively low boost!
Rogue, are you sure you want to go that big on the turbos?
I personally hate turbo lag......
Just kidding! I agree with you on the sizing and also the slope of the torque curve for driveability.
Hey, how's that one project coming along? :thumb:
It's coming along ok, really need to get a second pressure sensor and see how much (if any) pressure drop I'm seeing through the core. I suspect it's very low but want to be sure before I eat crow, those feathers tickle ya know. We'll see how she comes along, but I can tell you with 100% certainty it's far more efficient than what most people are using
oh check your PM's, got a little something I might want to try.
Dyno'd earlier this last week. Ive been in AZ at the Barrett-Jackson all week. Will post the dyno sheet and some video this coming week. We made this power on about 15 psi and 100 octane fuel. should push over 1200 rw hp with better gas and some more boost.
Denstoyz: What power did your car make in Charlotte? I thought it was alittle more than 986/957!!!! :thumb: Or was you using better gas in charlotte? Either way thats alot of power.
Denstoyz: What power did your car make in Charlotte? I thought it was alittle more than 986/957!!!! :thumb: Or was you using better gas in charlotte? Either way thats alot of power.
You wouldn't need the Turbo out of the D11, if it's the D11R, then that's a 32.5l V8 with 935 flywheel hp. Jusy get the ones off of their C-13 ACERT. I've always wanted to see if CAT turbos would work in a Viper.
There may be a little left in it from jumping up in size (depending on whats in there now) but making a grand at the rear wheels on 15psi isn't bad. The closer you get to that 1:1 pressure ratio you get diminishing returns and a shitty useful power band, aka supra. 
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