Reply to thread

Message: [QUOTE="Powerstroke Cowboy, post: 879056, member: 610"] That all depends on you goals. As Ty said the specs were for 250/200 and remember I said the Billet S482 would be the Smallest I would even consider running with 250/200 as a atmo turbo. To put it this way. A S475 will not completely clean up 250/200 as a single. So it will in no way clear them up as a atmo in a compound setup. It will get close as a single but not be CLEAN. By clean I mean smoke free. No smoke now you might get a slight puff when you first step on it but after that completely clean. This is right. Try a S362 with a billet S478 Or even the S480. For stage two and smaller. It will spool up, you can do a lot with exhaust housings! I feel a bigger exhaust wheel with a smaller housing will spool better down low ( or with less exhaust pressure) then a smaller exhaust wheel with a bigger exhaust housing. Its hard to say what is needed without knowing what the OP is looking to get for injectors and what he wants to do. A lot hinges there. I still say the S475 is to small. Let me dig up a flow chart for the turbo. that will help me explain why I feel it is to small. I am not trying to be hard headed here. I might agree with you if you had 175/80 or smaller injectors for the combo. Let me get a flow chart and post it up. Yes BUT higher intake temps make for higher EGTs. the cooler you can keep your intake temps the cooler your EGTs will be. So by running a compound setup to keep EGTs down but running more boost then would be needed if you had a bigger charger, Kind of start defeating the purpose of compounds. When you have more boost then needed your intake temps go up and along with that you EGTs go up. The difference between 400hp and 500hp is a BIG difference. and will take different parts and injectors. UNLESS you plan on running the 250/200 but keeping them detuned. Now if it was me. And you were looking for a max of 400hp I would do 175/80s Or if you want 500 MAX I would do 250/80 injectors Or the 250/100 Some tuners will tell you the 80% nozzle is better to tune then the 100% nozzle and is more crisp and clean. So First you need to decide what you want or need then we can get down to business. Exactly. Spot on. And in order to get to that point we need to know exactly what injectors the OP is going to run. Clean and fun is what compounds are all about. If you never plan to go above 500 238/80 or 250/80 should be fine. Then if you ever want to go bigger just get bigger nozzles put on and have them tweaked to match. Would work for sure IF you are not going for all the fuel the 250/200 can give. Would be good for towing to a point. still not enough air from the S475. The S475 is rated for 105 LB/MIN Now some 66mm turbos will flow in the 95 to 100 LB/MIN range. The S475 does not flow much air really and is nothing special. The 66/99mm turbo i have is rated to flow 99 LB/MIN And can not clean up a lower PW tune on a 300/200 The tune keeps the injectors under the 250cc mark. So its not even calling for near all the fuel it could get. Still maybe 70cc short of empty. This is over 45 PSI of boost right in th emeat of the comp map. Now try to only run 20 or 25 PSI it would be a smoky pig! Not sure it could be tuned to 450+ smoke free. After all you are not even getting all the air the S475 can give. You might be able to just would be hard and you might need porting to do it. What you need to do is take out pen and paper and decide what you want or need. Get the injector size stamped down and the HP goal you have plus your desired RPM of use. Then we can give you a better turbo setup. Until then we are spitting into the wind so to speak. Compounds bring a whole new level to the table. [/QUOTE]