decision decisions......... exhaust housing characteristics

Drasko

Drasko

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Jun 27, 2007
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I've been searching and reading until my eyes started bleeding and have yet to come to a final conclusion. I'm building what most guys here would consider a mediocre set of twins. The plan is an he351 with the drilled out wastegate to roughly 1" over an s475 I picked up last night. The 475 came with a t4 .90ar housing and a .1.10 t4 housing. I've heard off people using the 1.10 t4 on the primary but ive also read a lot about the 1.10 and 1.32 t6 housings being implemented. I do understand that the t4 will bring the primary on sooner than the t6 due to the larger volumetric flow but I haven't been able to find what the pros and major cons are from personal experiences.
The truck is a 99 f250 lowered 2wd reg cab long bed with the spare tire and as much random weight removed. It's sitting on 20x10 racelines with 305/50/20 nitto 420s. It's nothing but a street tow that will never tow as the whole receiver hitch is removed abd the bed had a 15gal fuel cell and the batteries. I'm hoping for 4500ibs with me in it.
The trans as of now is an nv4500 that will be replaced with a 47rh once the rest of the truck is complete and running.
12 valve
The blocks being bored .020 over and will receive large bowl pistons, 5x.016s, 160 pump, 25-30° timing.
I'm not planning for huge numbers although I know they will be possible, just a fun little toy to play in.

So after reading the lengthy post, which exhaust housing would be best for a set up like this? Should I try the housings I have and use the 1.10 t4 or would I choke the primary too much and cause possible during? Sorry for the lengthy post. I'm used to pull truck big singles, not quick street trucks with twins so I need some schooling. I just wanted to give as much info about my set up as possible.

Thank you
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Not yet. It's in the back seat of my railroad truck. I'm out of town at work and bought it where I'm at and have no access to a micrometer.
 
Guessing it is the 83x74 and they also make a housing .8,.9,1.,1.1, and 1.25 in a T6. Think those run about $200 new. I could be an option. By doing that it would make it easier to move to the T6 96/88 turbine setup later. Of course if you shop around I think you can find a new 475 with the 1.32/96/88 turbo for less than $650
 
Why so much timing for such a mild set of compounds? Doesn't seem necessary for the power range it is going to have.
 
If your not planning on towing, why not just run the 475 as a single? Otherwise I'd run a T6 on it.
 
^^^^ I am with rdix7991 on this one, if it is just going to be a fun toy then I would probably run the 75 as a single and not worry about doing a lot of swapping. With your mods you should be able to spool that up pretty decently and not have as many parts in the way under the hood.
 
It's purely a guess. My old pull truck with this primary as a single was at 27 and I thought I might try a little more to see how this ask would light. I've thought about running this as a single once I build an auto for this but wanted to play with twins while the trucks a manual. I think It will be pretty laggy on a light little truck with a manual. The reason for twins was to help give me a better bottom end when I'm "in Mexico"
 
Drasko said:
The reason for twins was to help give me a better bottom end when I'm "in Mexico"
Click to expand...

The other thing you need to think about is that since you're in a 2wd a set of quick spooling compounds may be hard to keep hooked up on the street.
 
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