Thanks for opening my thread. Here the deal. There is 2 or 3 downpipes for sale on Ebay right now, but they all say Powerstroke. Will this pipe below work on my '94 7.3 IDI turbo diesel? Thank you

Here is the link

MBRP 3" Downpipe 94-97 Ford Powerstroke F250 F350 7.3L: eBay Motors (item 140400805700 end time May-19-10 19:57:43 PDT)

 

nope. You can get ats downpipe for 68 bucks.

 

you can always take yours off, go to the local exhaust shop and have them cut your flare off and bend up a new one.

 

the only thing with the ats downpipe is that i believe it only works with their outlet housing because it doesnt have a flare like the stock one has at least thats what the guy at ats told me when i asked if i could just purchase the downpipe... who knows he was just tryin to get me to buy the outlet housing as well

 

IIRC the 1st gen PSD's had the same turbo we do with the same smashed downpipe

 

well the ats downpipe is too large for the factory turn down. you'd need the ats turn down as well...

 

yes the ats turbo outlet im thinking someone also made a downpipe for the factory outlet as well only unsmashed.i cant remember right now who it was though.i would love to get a couple spare factory down pipes to copy though and make one up myself

 

Thank you all very much for your replys.

I emailed the Ebay seller and of course he said it would fit

I ordered one from Banks but never received it. They then refunded my money. And theres nothing on ATS' site.

Im very suprised how dificult it is to find JUST a 3" downpipe for the 7.3 IDI

 

Hmmm, then this would mean that it does in fact fit AWESOME!!!

 

Why would you want to use one?



ATS 3" downpipe left, stock Ford smashed downpipe on the right.



ATS 3" turbo outlet flange left, stock Ford 2.25" ID turbo outlet flange right.

The 94 to 97 Stroke downpipe is smashed like the IDI turbo downpipe, but the Stroke downpipe has a different angle at the turbo outlet flange than the IDI does.

Just changed the stock downpipe on my Stroke, doubled the boost when I did.

 

doubled it! holy cow lol.i bet that woke the PSD up.

 

OMFG!!!!!!! This is INCREDIBLE!!!!!!!!!!!!!!!!!!!!!! Thank you so much for this 411 and the pics!!!!!

 

thats why most upgrade the housing as well

 

the 1st gen PSD really had the same turbo as the idi? was that same internals like impellers and everything?

 

PSD turbos are 1.10 A/R ratio and non waste gated on the first generation.

The stock IDI turbos were .84 A/R ratio and waste gated.

Both of them were Garrett turbos, but that is about the only thing they have in common.

The .84 turbo will make more boost down low and the waste gate limits the boost once the RPM is up high to prevent engine damage from excessive boost.

Stroke base compression ratio, 17.5 to 1.

7.3 IDI base compression ratio, 21.5 to 1.
6.9 IDI base compression ratio, 22.5 to 1.

When you start adding boost, the effective compression ratio looks like this with say each engine running 15 PSI boost.

7.3 Stroke, 35.35 to 1.
7.3 IDI, 43.43 to 1
6.9 IDI, 45.45 to 1

After I milled my pistons, at 25 PSI boost my effective compression ratio is higher than a Stroke running 30 PSI.

The base compression ratio an IDI engine runs is why the boost level has to stay low or the head gaskets don't last very long.
15 PSI is more than a stock 6.9 can stand, I was running 15 PSI on a stock 6.9 engine.
When I tore it down, I had fire ring errosion on every cylinder.

So when you look at PSD parts for an IDI, you are comparing apples to grapefruits.
They are both fruits and don't have spark plugs.
They also both burn diesel.
But they are not the same species.