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Originally Posted by j9fd3s' post='791569' date='Jan 2 2006, 04:34 PM
i'm gonna say a stock port will do 240rwhp@12psi with the stock turbo, and a street port will do 238.3hp@12psi with a stock turbo. turbo is just too small! thats impossible. there is no reason opening up the ports will lower the hp. you just wont be using the ports to their full potential. power = air + fuel we all know that. the ammount of air could only go up thus making more power. the car might run lean if some thing is not used to tune it but a bigger port will not make less power. the boost will probably spike to around 12 and then start dropping off as you get to 7-8k cause the turbo wont be able to keep up with the ammount of air the engine wants. |
Originally Posted by ikari89' post='792559' date='Jan 6 2006, 07:39 PM
thats impossible. there is no reason opening up the ports will lower the hp. you just wont be using the ports to their full potential. power = air + fuel we all know that. the ammount of air could only go up thus making more power. the car might run lean if some thing is not used to tune it but a bigger port will not make less power. the boost will probably spike to around 12 and then start dropping off as you get to 7-8k cause the turbo wont be able to keep up with the ammount of air the engine wants. No if the turbo can't move enough air to fill those ports it will lose hp. |
well not filling the larger ports is still more air then can fit though the smaller ports. in fact 12 psi on both set ups would mean much more air because to be able to hold 12 psi in the intake track with the larger exits to the rotors take alot more air. with a street port on a stock turbo you should see less pressure with as much or more hp. you will get more hp if the limiting factor in the stock set up is the turbo if it is the port size in the stock engine you will gain hp. and im pretty sure the turbo is not maxing out on the stock setup but the ports are pretty close.
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Originally Posted by ikari89' post='792573' date='Jan 6 2006, 07:27 PM
well not filling the larger ports is still more air then can fit though the smaller ports. in fact 12 psi on both set ups would mean much more air because to be able to hold 12 psi in the intake track with the larger exits to the rotors take alot more air. with a street port on a stock turbo you should see less pressure with as much or more hp. you will get more hp if the limiting factor in the stock set up is the turbo if it is the port size in the stock engine you will gain hp. and im pretty sure the turbo is not maxing out on the stock setup but the ports are pretty close. corkey bell did some research on the t2 in 87, for their cartech kits. the turbo is the limiting factor. at the engine peak flow rate its @45% efficency. or to put it another way, after instrumenting the whole car, they went from 180rwhp to 240rwhp by changing the compressor.... |
so yea if the turbo is maxing out and you make the ports bigger you will see a MINIMAL gain in hp if any
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it is about volume and not psi I am doing the same thing right now with a street port, stand a lone and stock turbo. I ran out of money and want todrive the car so i decided to find out what a stock turbo would do and friends who have done the same say the stock turbo will only oush a steady 12 psi and may spike to 16psi but that is running it at its burn up point so the best thing to do is run 10psi get your 250 hp and go for the better numbers with a better turbo.
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Originally Posted by sexycheerleader' post='793270' date='Jan 10 2006, 02:30 PM
it is about volume and not psi I am doing the same thing right now with a street port, stand a lone and stock turbo. I ran out of money and want todrive the car so i decided to find out what a stock turbo would do and friends who have done the same say the stock turbo will only oush a steady 12 psi and may spike to 16psi but that is running it at its burn up point so the best thing to do is run 10psi get your 250 hp and go for the better numbers with a better turbo. thats where we are with my roomates car, it wont boost higher than 12psi |
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