PT7875 times finally, 10.01@144mph
09-25-2011, 05:12 PM
#1
PT7875 times finally, 10.01@144mph DOH! .01 seconds away from my goal, oh well. The trap speed was definitely nice though! This was the first pass of the day, only a 1.65 60' as I didn't know what to expect on my new tires. Launched really soft, wish I wouldn't have.
Ended up quitting after my botched 2nd run. Tire on the drivers side got chunked pretty bad when I launched hard, and I ended up spinning anyways. Apparently I didn't clearance the wheel wells quite enough.
DA was 2492 feet. 4350 lb raceweight
All in all, I'm happy. Got my 140+ goal reached. Try next weekend for the 9.xx goal!
More info on the car can be found here
Ended up quitting after my botched 2nd run. Tire on the drivers side got chunked pretty bad when I launched hard, and I ended up spinning anyways. Apparently I didn't clearance the wheel wells quite enough.
DA was 2492 feet. 4350 lb raceweight
All in all, I'm happy. Got my 140+ goal reached. Try next weekend for the 9.xx goal!
More info on the car can be found here
09-25-2011, 05:14 PM
#2
Hell yea man good job!
Get that 60' in the 1.5x range and you'll have your 9 second pass. 4350 raceweight is gonna be hard to consistently hook on a small tire that GTO's limit you to.
Did you happen to log any of the passes?
And what were the incrementals?
Get that 60' in the 1.5x range and you'll have your 9 second pass. 4350 raceweight is gonna be hard to consistently hook on a small tire that GTO's limit you to.
Did you happen to log any of the passes?
And what were the incrementals?
09-25-2011, 05:22 PM
#3
Thanks man! I was bummed about the tire and no 9s, but I know it's just around the corner. It was very warm and muggy today too, this track usually sees sub 700 ft DAs and we were 2500 today.
I didn't log anything. I ALWAYS do and today I just said F it and have fun, haha.
It went 6.5x and 113.x in the 1/8th. I'll have to look at the slip for the rest. Looks like my converter is actually doing a nice job in 3rd though, can't complain with a 30+mph backhalf with an unlocked converter. Just need the 60 to come down. The trap is good for mid 9s no sweat. And this car always mph's better with a lower 60'.
I didn't log anything. I ALWAYS do and today I just said F it and have fun, haha.
It went 6.5x and 113.x in the 1/8th. I'll have to look at the slip for the rest. Looks like my converter is actually doing a nice job in 3rd though, can't complain with a 30+mph backhalf with an unlocked converter. Just need the 60 to come down. The trap is good for mid 9s no sweat. And this car always mph's better with a lower 60'.
09-25-2011, 07:21 PM
#6
Wow! Congrats!!! That's cranking. Just shows how bad that 68mm wheel is killing us. I know I picked up 5mph on my truck with the GT76 vs the T78 at same boost. I think that will turn closer to 10mph also when I turn it up. 9's should be a walk in the park now.. How much boost are you running?
I told my wife that I bet you would run a 9sec pass....so close!Trending Topics
09-25-2011, 08:34 PM
#15
Haha thanks Jason. How's your project coming?
It was picking up a solid 20-25hp per lb of boost on the dyno and it wasn't dropping off yet when we stopped at about 19.5. I just didn't want to go over 20lbs on stock GM heads with the 5 layer MLS gaskets. Not sure how much more it would go.
It was picking up a solid 20-25hp per lb of boost on the dyno and it wasn't dropping off yet when we stopped at about 19.5. I just didn't want to go over 20lbs on stock GM heads with the 5 layer MLS gaskets. Not sure how much more it would go.
09-25-2011, 08:37 PM
#16
Either way, I can't complain with how she runs
This gets me excited to see what our RX7 is going to run with almost 1500lbs less and a similar setup.
09-25-2011, 08:42 PM
#17
Whatever the pressure ratio is it takes to max the turbine wheel. You won't gain much with a 76mm wheel compared to a 78mm wheel or even a 100mm wheel if you're using the same size turbine wheel. It really depends how much hp your engine makes n/a.
Rough Example: Say the turbine maxes at 1000 hp flywheel. 300 hp engine will take roughly a pressure ratio of 3.33 or 34lbs of boost. 500 hp engine will take a pressure ratio of 2.0 or 14.7lbs in theory to make 1000 hp. There are a lot of factors though you have to consider, more heat with more boost, compressor wheel efficiency, back pressure and other efficiency losses. Most street turbo setups (quick response) will double the n/a power around 15-16lbs of boost.
Rough Example: Say the turbine maxes at 1000 hp flywheel. 300 hp engine will take roughly a pressure ratio of 3.33 or 34lbs of boost. 500 hp engine will take a pressure ratio of 2.0 or 14.7lbs in theory to make 1000 hp. There are a lot of factors though you have to consider, more heat with more boost, compressor wheel efficiency, back pressure and other efficiency losses. Most street turbo setups (quick response) will double the n/a power around 15-16lbs of boost.
09-25-2011, 08:47 PM
#18
Whatever the pressure ratio is it takes to max the turbine wheel. You won't gain much with a 76mm wheel compared to a 78mm wheel or even a 100mm wheel if you're using the same size turbine wheel. It really depends how much hp your engine makes n/a.
Rough Example: Say the turbine maxes at 1000 hp flywheel. 300 hp engine will take roughly a pressure ratio of 3.33 or 34lbs of boost. 500 hp engine will take a pressure ratio of 2.0 or 14.7lbs in theory to make 1000 hp. There are a lot of factors though you have to consider, more heat with more boost, compressor wheel efficiency, back pressure and other efficiency losses. Most street turbo setups (quick response) will double the n/a power around 15-16lbs of boost.
Rough Example: Say the turbine maxes at 1000 hp flywheel. 300 hp engine will take roughly a pressure ratio of 3.33 or 34lbs of boost. 500 hp engine will take a pressure ratio of 2.0 or 14.7lbs in theory to make 1000 hp. There are a lot of factors though you have to consider, more heat with more boost, compressor wheel efficiency, back pressure and other efficiency losses. Most street turbo setups (quick response) will double the n/a power around 15-16lbs of boost.
09-25-2011, 08:49 PM
#19
He's showing right at 1000HP conservatively calculated at the FW. Many cars I check on here don't even show their RWHP at the flywheel. (MPH X .00426)3 X weight = FWHP showing. This formula is right on with the Moroso power speed calculator.