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Oct 20, 2016 | 02:25 PM

Walleye Hunter

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From: Douglassville, PA

Need Turbo Help

In the midst of my E99 upgrade and stumped.

Adding 2003 van turbo, pedestal and turbo installed. Truck has 4" SS exhaust. Van turbo has smaller exhaust outlet, what is the remedy for this?

Thanks,
Mark

Oct 20, 2016 | 04:00 PM

carguy3j

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1.0 A/R 1.15 A/R 3 Bolt 7.3L Turbo Outlet Adapter

Oct 20, 2016 | 04:50 PM

Walleye Hunter

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From: Douglassville, PA

Aaahhh, thanks for that carguy3j, can't rep ya right now but that makes me breathe easier.

Oct 21, 2016 | 05:28 PM

Bonanza35

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From: Norco,CA

You should be able to use the one off your old turbo can you.

Oct 21, 2016 | 05:59 PM

Walleye Hunter

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Quote:

Originally Posted by Bonanza35

You should be able to use the one off your old turbo can you.

No, they're not even close. The F series trucks' turbo outlets are huuugggge with about 8 bolts holding them in place. The E series' are much smaller and only have three bolts holding them on.

Oct 21, 2016 | 06:30 PM

Bonanza35

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Well thank you, I just learned something. Never ran one myself. Just figured they were the same.

Oct 21, 2016 | 07:22 PM

carguy3j

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Quote:

Originally Posted by Bonanza35

You should be able to use the one off your old turbo can you.

Quote:

Originally Posted by Walleye Hunter

No, they're not even close. The F series trucks' turbo outlets are huuugggge with about 8 bolts holding them in place. The E series' are much smaller and only have three bolts holding them on.

That's because the truck turbo outlet contains the wastegate flapper valve, and the van turbo has no wastegate.
I suspect that the truck outlet causes a lot of turbulence in the exhaust flow, because of the funky shape/volume where it opens up for the wastegate. Instead of flowing smoothly, directly out and into the downpipe, the gases have an opportunity to expand ( and slow down) into that extra volume, and probably tumble and cause a turbulent restrictive flow. All else being EQUAL (which isn't really possible to do), if the truck turbo had an outlet shaped like the van one ( with the wastegate removed) , it would likely flow better.