16cm Turbo housing questions

[dwalker151]

I finally got my gages installed in the work rig today. The gages are working well but I guess I'm not liking what they are telling me. I don't have hardly any boost at all until about 1900 RPM. So I was wondering if a 16cm housing would make much of a difference, any opinions?



On another note, does anyone know what a 91 non- IC motor should read on the pyro. I'm getting about 2. 5 at idle 6 at about 55 and a max of about 10 when lugging the snot out of it.



P. S. My probe is in the manifold



Thanks

Dean

 

[dusthomps]

Dean...



Your pyro readings are about the same as my 91. I run 275 at idle, 750 at 60 and max of 1300 when severely lugging motor. Other than the turned up pump, no other mods and I can push 25 psi pretty easy.



Dustin

 

[JLEONARD]

I don't have hardly any boost at all until about 1900 RPM. So I was wondering if a 16cm housing would make much of a difference

I had a 18 cm housing on mine and it 'shifted' my boost down about 4/500 rpm with the 16cm. So you should see the boost come on at about 1400/1500 rpm or so.

The pyro numbers seem about right to me. I think the max I have seen so far is about 1100 or so.

Enjoy.



Jay

 

[dwalker151]

Ok. . Cool it seems that I'm getting about the right readings. I think I will try and aquire a 16 cm housing though because I use the 1500 Rpm range a lot more than the 1900 - 2100 range. Where is the best place to buy one???



I mounted my guages in the dash on the right hand side where the middle vent went. It turned out to be more of a job than I thought it would be but it looks nice and seems to fit well with the dash.



Dean

 

[JLEONARD]

Dean,

That's where my gauges are also... .

The 16 cm housings are easy to get a hold of..... you can try the classifieds, Piers, Gomer's or any of the other sources available via the "links" tool bar at the top of the page. Shop around as prices vary alot. I think they pretty much all come with the necessary gaskets... but ask to be sure.

Start soaking the mounting bolts and the bolts that hold the turbo halves together about a week before you try to make the change...



Good luck.

Jay

 

[CAROLINA CUMMINS]

The 16cm is a great size, fueled or stock it works good. I got mine from TST $150 including gaskets and shipping. I can max 1200 deg towing or otherwise 1200 is all she can do, I also can hit 25# of boost when I run her hard.









Steve

 

[BushWakr - RIP]

dwalker,



I'll add my thoughts to this as well, if you'd care to consider them. .



I fully agree on the 16cm housing... why...

It is a good all around housing. The inlet to the 16cm is just starting to 'neck down' or, get a bit tight.

If you plan to uprate your fueling much, and/or tow, you'll be better off with the 16.

It gives decent spool-up response, creates good overall boost, has better EGT profile than, say, a 14cm or 12cm. It is a 'no modification to downpipe' bolt on fit.

Less likely to run out of air, or start choking at highway speeds.

And also, since you're non-intercooled, housing size is even more important.

Lastly and also very important, your MAX. EGT is 1250*F for sustained temps. You will want to cool down to 300*F or LESS before shutting down.

Since the pyro probe is in the manifold, it responds very quickly to temp increases, but does not respond to quickly to the cooldown temps.

Remember, all that heavy casting of the housing is AFTER the pyro probe, so the guage may say 300*F but the housing may well still be 375* or 400*F since it takes longer to cool. You can "coke" a turbo if you consistently shut it down while too hot.



Just my . 02 cents.



bob.