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7.3 Aftermarket
Twins for dumbies
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[QUOTE="Vader's Fury, post: 94149, member: 473"] First of just to clarify, the type of turbo set-up you guys are talking about is a compound turbo set-up. "Twins" is when you are running 2 turbo's that are the same, one off each manifold, like chris did on his build I believe was called WTF. Most of the DD set-ups that I have seen for the 7.3 use a 66mm primary and a 88+ for the atmosphere. The types of turbo's can be mixed and matched however you would like but the size is the important part. For example I will use the set-up I am currently putting together. I have a set of 250/100 injectors in my 450. I am currently installing a S466 with a .90 housing. I know that the housing is tight but I have a wastegate going on as well to limit backpressure. Basically my goal with this set-up is to get good spool-up and low end power as I regularly tow heavy with this truck. I also have a 1.00 and a 1.10 housing that I plan to swap onto the turbo to see how much of a difference in spool-up and backpressure the different housings make. You could use a larger turbo such as a 68 or a 71 for your primary turbo, or even a 75, but unless you are building a set-up like brians for all a racing or pulling only truck, You have to remember that the primary is what gives you your low end responce. So you don't wanna go to big as that will cause it to be laggy and completely defeat the purpose of compound turbo's. I am pretty sure that the 66 will not move enough air in the higher rpm's for me to use all 250 cc's that my inj are capable of so I have a plan to go with compound turbo's later on down the road.(maybe as early as this winter, depending on funds) From all of the research I have done, I would not use anything smaller than an 88mm for the atmosphere charger. While you could use say an s483 and it would work, the 88 would be more efficient and most likely live a longer life. As for how to set it up. My plan is basically the same as I have seen for charles set-up or for brian's new set-up. Hang the atmosphere charger where the pass battery resides. The charged air would route from the outlet of the primary, down and into the stock intercooler. (you would be reverse flowing throught the intercooler) On the driver side it would exit from the intercooler and flow up and into the intake of your primary charger. From the primary it would go directly into the intake plenums on the motor. For the exhaust flow, the flow leaves the manifolds and goes up the up-pipes and into the primary turbo. You will want to run a wastegate around the primary turbo and back into the intermediate pipe. I am using a 46mm. From there the exhaust gases flow through the intermediate pipe and into the exhaust housing on the atmosphere turbo. Once again you are going to want to use a wastegate to bypass around this turbo to the dp. From the atmosphere turbo you would go into the dp and out the exhaust. For exhaust housings you want a exhaust housing on your primary that is tight enough to give you good spool-up, but not so tight that your wastegate is not large enough to keep it from overspeeding. For the Atmosphere turbo you want a larger exhaust housing as this turbo does not need to light as fast but will be seeing alot of exhaust flow. Remember anything that you gate around the atmosphere turbo is wasted energy. I plan to use either the 1.00 or 1.10 on my S466 as a primary and a T-6 1.32 on a S488 or S491 as the secondary. [/QUOTE]
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