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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? |
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. |
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. |
id be thinking about 2 turbos, that way you get more exhaust side/flow/lower restriction
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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.
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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. |
umm i ment 102mm gt42r which should have max flow of 95 lb/min @ 35psi
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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? http://www.turbobygarrett.com/turbob...6_2_comp_e.gif |
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 .
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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
demon32_22@hotmail.com mark |
Once again thanks! What we're settling on at this point is a 48.5mm port, a 102mm GT42R w/T6 hotside, twin 65mm throttle bodies, and undetermined wastegate.
We'll see how it works... I'm afraid the TBs will be too big but they're a stock Ford TB that's used in everything under the sun so they're uber cheap. I've been trying to find a Ford twin blade 54mm that's used in the V10s but have had no luck so far. The car came back from the chassis shop with the cage last week and they're working on our new axle right now. We're not looking to set records...just to have some rowdy fun at our local strips. https://www.nopistons.com/forums/pub...IR#>/smile.png |
Post some photos of progress as it happens https://www.nopistons.com/forums/pub...#>/biggrin.png
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Originally Posted by Nospig' post='804376' date='Feb 26 2006, 12:35 AM
Sure will. |
The 42R arrived today. It came via USPS and my mail lady is this sweet little old lady. I had to help her get the turbo out of her car. https://www.nopistons.com/forums/pub...IR#>/smile.png Sure everyone has seen pics of a 42R but here it is sized against the PT61 that was on the car last year before the ownder decided to take it off the street, for the most part, and make a drag car out if it.
http://www.ludwigmotorsports.com/rx7/gt42r.JPG http://www.ludwigmotorsports.com/rx7/P1010091.JPG |
WOW Thats massive!
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I have been thinking about letting my dad who wants to make a turbo PP12a, use my MFR housings. he wanted to use a 1.36 a/r T04 housing on the hot side and a .70 a/r on the cool side. i was thinking the cool side needed to be bigger. Would this be an appropriate sized turbo?
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holy monkey! looks like you really mean business ...
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Got the housings back from the machine shop today. Popped the sleeves in and welded them up. At this rate the car might run by July. https://www.nopistons.com/forums/pub...IR#>/smile.png
http://www.ludwigmotorsports.com/lmspport2.JPG http://www.ludwigmotorsports.com/lmspport.JPG |
that turned out nice!
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Originally Posted by j9fd3s' post='812718' date='Apr 8 2006, 10:48 AM
that turned out nice! The hardest part was answering all the questions from the guys at the machine shop. https://www.nopistons.com/forums/pub...1047683785.gif |
hey the ports look good did you port the exhaust ports ur self? i was told not to take the porting downwards because it can create too much overlap?.
but looking very nice. |
If you port up on th exhaust ports it creats overlap.
The downside to porting down is that it shortens the power stroke, but it allows you to get the affects of porting the exhaust w/o overlap and hurting bottom end. If you port down on the primary intake ports it creates more overlap. On turbo motors (street driven) I try to stay away from this and port more up. On N/A I like porting down on the primaries. It takes away from the lower end but it really wakes the car up on in the upper rmps. Hope that helps. |
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