he351 swap on a 92 i/c --> install info
 

just finished up the swap. overall very easy swap. there
are a few things that you will have to make a personal
decision on, depending on your budget.

i got a 351cw turbo free from a buddy that upgraded to a
bb turbo. also bought a new stock manifold as the one
that was on there was really rusted out by the firewall due
to the poor engineering job water shedding at the back
of the hood.



here is a shot of the turbos side by side. you can obviously
see the huge difference on the exhaust housing side.

Attachment 39831

http://i303.photobucket.com/albums/n...101_180323.jpg

the install was easy. i went ahead and mounted the 351 onto the new manifold
before bolting it up ( per pic above ). this made it easier in my mind to get the
turbo fitted squarely and all bolts tight. you do have to drill out the manifold
holes to accept the studs that are on the 351 turbo. got the turbo and manifold
mounted up to the block which was fairly easy other than the weight and how
bulkly the combo is. anyway, got it all installed with new gaskets too. i did clock
the exhaust side so i could make sure the oil lines were lined up. also bought a
silocone tube from diesel auto power to make the compressor --> intercooler
connection. that also took a bit of fabbing as its really made for a 351 swap
on either a 2nd gen, or a 1st gen with a 2nd gen intercooler. either way, i made
it work.

next thing i had to figure out was the oil feed and return line. what i found out
when getting the turbo / mani put on, was that the return line bolts right
up to the new turbo, which was a big relief. the feed line connections are way
different from 1st to 3rd gen, so what i did was have a high pressure hose shop
that was local, make me up a custom oil feed line with the correct fittings on
each end. this cost me $80. i didnt know any other way to make it work, so
i thought it was a good trade off.

next thing to worry about was the downpipe. what i did was buy a 1st gen 4"
dp, and also bought a he351 flange from diesel auto power. i shaved off the
stock flange and had my buddy @ krawltex weld the new flange on. the dp fit
on the 351 perfectly and the dp fit overall 100%. clearance was good, so no
issues. still need to complete the exhaust past the dp, but thats no biggie.

a few other things i had to deal with was the wastegate assembly. i decided to
run the turbo with no wastegate, as i have no fuel mods, so its not an issue.
i tack welded the wastegate shut and bought an ats style solenoid plug to keep
everything nice and plugged off.

here are a few pics - any questions, fire away.

adjusting the wastegate parts

Attachment 39832

test fit / install

Attachment 39833

Attachment 39834

4" downpipe with new flange installed

Attachment 39835

install complete - with no fueling mods i see 20 - 21 lbs of boost at wot. was barely
seeing 12 lbs with the big 21cm stock turbo.

Attachment 39836

Attachment 39837

sweet install man! is it one long silicone hose from the turbo to the intercooler?

its this hose right here.

HE351 Silicone Boot

i cut the ginormous end off of it and modified it to fit.

i would keep an eye on that one. i would think something like that could let go pretty easy??

not right now with only 20 lbs or so. i have
been checking it frequently, so we'll see.

intercooler pipe still holding strong with 22lbs
of boost.

got the resonator in yesterday, so will be buttoning up
the 4" exhaust over the wknd. so far, this is an awesome
mod..

ive heard its one of the better stock turbos. it has a 9cm housing and a 60mm compressor wheel. the upgrade kit for the 35's is the 60mm wheel and uses the factory 12cm housing.

here's a few vids of the fte 4" resonator
installed.

When I put mine on, I changed the oil line fittings from the h1c to the 351. It worked and I didn't have to get anything made!!!

i didnt mind getting a new one made up.
both ends are press on. can you unbolt
the fittings on the oil housing side of the
hose ?

i didnt think so .

No man. The fittings on the turbo itself unbolt. Or it worked for me :jump:

---AutoMerged DoublePost---

And if I was you I would be very eerie of that filter, I have seen them suck themselves in. Crazy stuff. I reclocked the intake and used the stock intake hose hooked up to a BHAF. I will get some pics of mine up later today

okay thanks. yeah i tried to swap the fittings every
which way and it was a no go. im doing a different
filter today, that was just on there for temporary. im
not sure 25lbs of boost would suck that in lol

so no pics of your magic swap on the oil
lines ?

I was going to go with a VGT turbo but im curious now as to how this bolted up.

So the bolt patterns the same for this turbo as the stock turbo just you have to drill out the top two holes on the manifold flange? is the 351 t4 flange or still a t3?

And by shaving down the adapter for an hx40 do you mean just cut part of the end off cause it was too long or was the diameter wrong?

Thank you for this it helped me get a better visual on how to do mine, :tu:

The flange is wgmt, kinda between a t3 and t4. I drilled and tapped the exhst housing for 1/8" solid pipe plugs. Then I ground down the plugs flush and sanded it smooth. I used a t3 gasket to trace the new holes and redrilled using a drill press

Ok that makes sense now,

I think this is the route I am going to go seems like a good mod.

Thanks

I'll be doing this swap at some point after my H1C gives up the ghost. It's my understanding you can also un-bolt and clock the compressor housing to get a near-stock straight shot at the intercooler.

I used the he351ve (6.7), I guess I'm not sure about the flange on the he351cw. I love the vgt with the exhst brake. Also, when cruising down the hwy I can open up the vanes to free up the exhst for better mpg and lower exhst temps. And yes, both exhst housing and comp housings are v-band clamped so full clocking on both, but you have to remove the alignment pins first. Very easy with a pair of vise grips

the bolt pattern is exactly the same, just have to drill the two
stud holes out to fit the he351 studs. its no big deal and took
me all of 10 minutes.

for the downpipe, i cut only the flange off, then sanded the inner side
of the pipe, to be sure it was nice and even, then welded the
he351 flange right back to it. you can see in the below pic where
it was welded. once i got the turbo installed, the downpipe fit
like a glove, it all lined up perfectly. reason you have to do this is
because of the tiney exhaust outlet on the 1st gen turbo, vs. the
bigger outlet on the he351.

let me know if you have any other questions.

check out where the weld is on the dp, its exactly where i cut off
the original flange.

http://i303.photobucket.com/albums/n...112_111005.jpg

That's a huge air filter!