P-port turbo sizing
01-30-2006, 12:48 PM
#1
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For those that haven't looked into the p-port housing source thread here are the cliff notes...
I'm partnering up with my buddy on a drag car. It will be built mostly for fun but we also plan to compete in our local import series. The car is an FB. The rules for the class we plan to compete in a very liberal toward rotaries. No porting restrictions allowing 2 or 3 rotor. 3 rotor is out of the question for our budget. We had originally planned a street ported REW with a GT42R for the car. That grew to bridge porting which quickly grew to p-porting as the car developed less and less of a dual purpose street car nature. We've pretty much settled on p-ports at this point.
Now, what kind of turbo will we need to feed a 13B p-port? I was fairly confident in the 94mm 42R to feed 60lb/hr at 25psi on the REW. But assuming the VE of the p-port is going to be greater will the 102mm 42R still be large enough? And specifically does anyone have a good rule of thumb on the lb/hr requirements of a p-port?
I'm partnering up with my buddy on a drag car. It will be built mostly for fun but we also plan to compete in our local import series. The car is an FB. The rules for the class we plan to compete in a very liberal toward rotaries. No porting restrictions allowing 2 or 3 rotor. 3 rotor is out of the question for our budget. We had originally planned a street ported REW with a GT42R for the car. That grew to bridge porting which quickly grew to p-porting as the car developed less and less of a dual purpose street car nature. We've pretty much settled on p-ports at this point.
Now, what kind of turbo will we need to feed a 13B p-port? I was fairly confident in the 94mm 42R to feed 60lb/hr at 25psi on the REW. But assuming the VE of the p-port is going to be greater will the 102mm 42R still be large enough? And specifically does anyone have a good rule of thumb on the lb/hr requirements of a p-port?
01-30-2006, 01:09 PM
#2
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Join Date: Oct 2004
Posts: 110
Originally Posted by C. Ludwig' post='797878' date='Jan 30 2006, 11:48 AM
For those that haven't looked into the p-port housing source thread here are the cliff notes...
I'm partnering up with my buddy on a drag car. It will be built mostly for fun but we also plan to compete in our local import series. The car is an FB. The rules for the class we plan to compete in a very liberal toward rotaries. No porting restrictions allowing 2 or 3 rotor. 3 rotor is out of the question for our budget. We had originally planned a street ported REW with a GT42R for the car. That grew to bridge porting which quickly grew to p-porting as the car developed less and less of a dual purpose street car nature. We've pretty much settled on p-ports at this point.
Now, what kind of turbo will we need to feed a 13B p-port? I was fairly confident in the 94mm 42R to feed 60lb/hr at 25psi on the REW. But assuming the VE of the p-port is going to be greater will the 102mm 42R still be large enough? And specifically does anyone have a good rule of thumb on the lb/hr requirements of a p-port?
My calcs say 52lbs at 7k and 25 psi for stock ports, pport possibly 73 lbs if reved higher and VE isn't dropping of you might flow 83lbs. Problem with the turbo isn't the cold side it will be the hot side for top power.
01-30-2006, 02:39 PM
#3
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Originally Posted by z8cw' post='797887' date='Jan 30 2006, 02:09 PM
My calcs say 52lbs at 7k and 25 psi for stock ports, pport possibly 73 lbs if reved higher and VE isn't dropping of you might flow 83lbs. Problem with the turbo isn't the cold side it will be the hot side for top power.
That's the kind of info I was looking for. My WAG was in the 75lb/hr area. We're looking at a T6 hotside so that should be a problem.
01-30-2006, 04:20 PM
#5
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In japan they use T51 r spl with 1 a.r hotside @ about 1.2 kg round 8000rpm with pp 13bs and seem to get around 680 - 720 RWHP . 102mm gt42R compressor wheel is basically the same trim and has same induser and major and the exhaust a.r can be had at 1.01 a.r. I would think it would be a safe bet and plan to use one on my set up when the time comes.
01-30-2006, 04:20 PM
#6
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Originally Posted by j9fd3s' post='797939' date='Jan 30 2006, 03:59 PM
id be thinking about 2 turbos, that way you get more exhaust side/flow/lower restriction
Thought occured to me but the space limitations might be an issue. Need to mock it up and take a look.
01-30-2006, 05:25 PM
#8
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Originally Posted by Nospig' post='797991' date='Jan 30 2006, 05:26 PM
umm i ment 102mm gt42r which should have max flow of 95 lb/min @ 35psi
102mm 42r map doesn't look like it can make those numbers very well or am I missing something?
01-31-2006, 01:22 AM
#9
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Posts: 277
88 lbs at 1.5kg should be enough for around 700+ rwhp @ round 8200 rpm . 1.01 ar hot side with a 50-60 mm wastegate should be fine. Seen plenty of idiots go way to big with hot side and not get the results they are looking for. Generally blaming everything else . Go to big with hot side and you might not get into the efficiency zone on compressor map or just get there at 9500 +rpm .
02-24-2006, 06:37 PM
#10
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wht we found tht a 50mm p-port is good if you r useing meth you will need to run 10 1700cc injectors,turbo size will b if you go twin 2x gt35r or if you go single 1xgt45rs, on the wasteg8s for the twin set run 2x 48mm or on the single set 1x60mm, good after market computer,on the inlet side for th twin set 2x50mm throttle bodies or 1x100mm t/b for the single, two peice e-shaft ths will gv you around 552kw which will gv you a low9 to a high 8 but you will have to set up the drive line to suit if any other ?s jst e-mail me on
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