Scottie-GNZ Posted March 9, 2007 Share Posted March 9, 2007 35 psi with about 20 psi turbine side back pressure will give you about 500 hp -Les Sorry, not quite sure I understand what that means. Quote Link to comment Share on other sites More sharing options...
stony Posted March 9, 2007 Share Posted March 9, 2007 Sorry, not quite sure I understand what that means. I wasnt going to post anything but the more i thought about that post the more i wanted to know exactly what you mean. Quote Link to comment Share on other sites More sharing options...
lesd Posted March 9, 2007 Share Posted March 9, 2007 A turbocharger adds exhaust back pressure to the engine. An engine is basically an over glorified air pump. The VE ( volumetric efficiency ) is a measure of how well it works ( pumps air, really ). Exhaust back pressure must be balanced with the intake pressure with the selection of correct turbocharger to get power. I don't even want to think about the peak cylinder pressures would be like on a 35 psi boosted motor if it *didn't* have a lot of exhaust back pressure to hold it back! more basically: I don't do no good to run 35 psi boost if the exhaust can't get out.... -Les Sorry, not quite sure I understand what that means. Quote Link to comment Share on other sites More sharing options...
stony Posted March 9, 2007 Share Posted March 9, 2007 So what your saying is your gonna build a bullet proof motor that could hold 1000+hp put a really small turbo on it with a small exhasut housing (for backpressure) and run it at 35 PSI. Quote Link to comment Share on other sites More sharing options...
Cal Poly Zmanaustin Posted March 9, 2007 Share Posted March 9, 2007 I would like more details as this has peaked my curiosity. I too am lost on 35psi and 500whp from a 383. Please elaborate. Quote Link to comment Share on other sites More sharing options...
Clifton Posted March 9, 2007 Share Posted March 9, 2007 It has more to do than just 60 a/r on the cold side. A Z turbo uses a 60 trim, just happens to be a 60 a/r too even though the 2 aren't related. You can have a .55 a/r with a wheel that will flow twice what a 60 trim Z turbo flows. As for what would work on your V8. 2 60 trim T3's isn't nearly enough for the volume you plan. You need to figure out the boost you really intend to run and the amount of air it will use and then look at the flow and pressure ratio of the turbo/turbos. I wouldn't go by what an ebay add says of the turbo. Find out what it is and look at the map of it, if it's a Garrett turbo it will be easy to find. Quote Link to comment Share on other sites More sharing options...
rdsk8ter Posted March 9, 2007 Author Share Posted March 9, 2007 Ok the more research the better lol Ill need around 15-20lbs and the motor will be built to handle 35psi I mis-understood the builder of the engine. Im not fully up on turbos, and have a little bit of a learning disablity. I can only learn by seeing. I can read it all day long every day for a month but until I see pictures and or get to toy with it I dont grasp it. Quote Link to comment Share on other sites More sharing options...
sweetleaf Posted March 9, 2007 Share Posted March 9, 2007 I really think you have a lot more learning to do before you start buying parts. Not trying to be an ass but lets start with the basics. What compression are you planing on running? What kind of a cam profile? etc.. We need all the basic engine specs before we can help. Quote Link to comment Share on other sites More sharing options...
rdsk8ter Posted March 9, 2007 Author Share Posted March 9, 2007 I will find out the specs from the engine builder tomorrow. What all do you need to know? Here is what I can think of. cam specs Heads compression ratio Like I said it will be a fully roller motor and it is being designed by a pro not me lol. I am no where near qualified to design this setup. I trust you guys very very highly and would love you guys and gals oppinions about this Quote Link to comment Share on other sites More sharing options...
stony Posted March 10, 2007 Share Posted March 10, 2007 OK now everything makes sense. Quote Link to comment Share on other sites More sharing options...
Jelloman457 Posted March 10, 2007 Share Posted March 10, 2007 What are you building this car for? Quote Link to comment Share on other sites More sharing options...
rdsk8ter Posted March 10, 2007 Author Share Posted March 10, 2007 track and weekend warrior Quote Link to comment Share on other sites More sharing options...
Jelloman457 Posted March 10, 2007 Share Posted March 10, 2007 track as in circle or drag or road racing? this will help if answered correctly. Quote Link to comment Share on other sites More sharing options...
rdsk8ter Posted March 10, 2007 Author Share Posted March 10, 2007 drag and a little road race in the future Quote Link to comment Share on other sites More sharing options...
(goldfish) Posted March 13, 2007 Share Posted March 13, 2007 Two points to make... 1. boost psi is in no way related to how many CFM gets in to the engine. 2. If the exhaust mani psi = intake mani psi you're doing good. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.