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silviasichigo · 04-26-2002, 07:02 PM

Ok let's try to claer this up. I have a 93 redtop with 45000Km on it. I have a 3.5 inch exhaust or 88pi whatever you want to say. it is perfectly normal to run high diameter exhaust on a stock SR. There is nothing wrong with boosting a stock internal sr with stock sr fuel pump. On the other side what are you boosting so high for. I dry hopp so that it is why I boost a SR with 3.5 exhaust, Greddy profec A, Apexi filter,stock SMIC, and stock fuel system. You can boost this engine safely at .92Kg/cm2 (13.1psi)on high Octane fuel and make 12 hard passes with no trouble if in between runs you take care of the car.Cool it off open the hood. I have done this for the past year twice a month. at .92Kg/cm2 (13.1psi) My S-14 is only slightly moded I am boosting  1.02Kg/cm2 (14.5psi) The Sr is stronger than you think and will last if you use the right parts. I have had a lot of experiance with the SR I only use stepping motor Boost controllers for the fact they get you to your boost with more stability than solonoid boost controller. My friend (Junia Knows who I am talking about Mario) had a 91 S-13 with an SR he had a solonoid boost controller. Hed boosted his engine to 1.04Kg/cm2 (16psi)and made 7 passes with two passengers and did not blow until his last pass and that was with no cool down 3.5" exhaust, Stock fuel, Stock internals,and only a solinoid boost controller. He chose his own path but he boosted 16psi for 7 good hard passes. This engine can do more than you expect. The way I see it everyone here is right You have to be conservative since you don't have SR's falling out of the sky like me and Junia and some of the other members that happen to be in Japan. I am speaking from experiance nothing less. It is ok to boost a stock SR ( Internals) To 13.8 psi if you take it slow learn your engine. Start off low Go from stock and boost up until you feel comfortable with it. You will have a gain in power. I have only lost two races sice I started and that was to 2 highly Moded RX-7's I am talking easy 10-11 sec cars. I will be racing in the up coming HKS drag meet and I think I will do pretty damn good. (Junia I finally got my power FC in the car)

Put it this way becareful you boost to what is comfortable watch you guages  get a fuel pressure guage that is the best way to test your boost. You can closely monitor it (if it has a warning light like mine) you can just look up at the warning signal and let off. Get a boost controller that has a warning boost cut feature (I preferr the Greddy Profec A) it has all the features you need. The actuator valve on the red top is not very stable and you will get a lot of boost spikes that is why I preferr a stepping motor to a solonoid. The stability issue.

04-26-2002, 07:02 PM	#10
silviasichigo Zilvia Addict Join Date: Mar 2002 Location: Japan Age: 49 Posts: 782 Trader Rating: (0)	Ok let's try to claer this up. I have a 93 redtop with 45000Km on it. I have a 3.5 inch exhaust or 88pi whatever you want to say. it is perfectly normal to run high diameter exhaust on a stock SR. There is nothing wrong with boosting a stock internal sr with stock sr fuel pump. On the other side what are you boosting so high for. I dry hopp so that it is why I boost a SR with 3.5 exhaust, Greddy profec A, Apexi filter,stock SMIC, and stock fuel system. You can boost this engine safely at .92Kg/cm2 (13.1psi)on high Octane fuel and make 12 hard passes with no trouble if in between runs you take care of the car.Cool it off open the hood. I have done this for the past year twice a month. at .92Kg/cm2 (13.1psi) My S-14 is only slightly moded I am boosting  1.02Kg/cm2 (14.5psi) The Sr is stronger than you think and will last if you use the right parts. I have had a lot of experiance with the SR I only use stepping motor Boost controllers for the fact they get you to your boost with more stability than solonoid boost controller. My friend (Junia Knows who I am talking about Mario) had a 91 S-13 with an SR he had a solonoid boost controller. Hed boosted his engine to 1.04Kg/cm2 (16psi)and made 7 passes with two passengers and did not blow until his last pass and that was with no cool down 3.5" exhaust, Stock fuel, Stock internals,and only a solinoid boost controller. He chose his own path but he boosted 16psi for 7 good hard passes. This engine can do more than you expect. The way I see it everyone here is right You have to be conservative since you don't have SR's falling out of the sky like me and Junia and some of the other members that happen to be in Japan. I am speaking from experiance nothing less. It is ok to boost a stock SR ( Internals) To 13.8 psi if you take it slow learn your engine. Start off low Go from stock and boost up until you feel comfortable with it. You will have a gain in power. I have only lost two races sice I started and that was to 2 highly Moded RX-7's I am talking easy 10-11 sec cars. I will be racing in the up coming HKS drag meet and I think I will do pretty damn good. (Junia I finally got my power FC in the car) Put it this way becareful you boost to what is comfortable watch you guages  get a fuel pressure guage that is the best way to test your boost. You can closely monitor it (if it has a warning light like mine) you can just look up at the warning signal and let off. Get a boost controller that has a warning boost cut feature (I preferr the Greddy Profec A) it has all the features you need. The actuator valve on the red top is not very stable and you will get a lot of boost spikes that is why I preferr a stepping motor to a solonoid. The stability issue.