H1c questions

[mattme]

I have 2 compressor housing and wheels for my turbo. The stock 89 non incooled 3" inlet and a later 4" inlet. I know that the inducer size are different as well as the inlets. Which leads to my question

Are there any performance differences between the 2 other than what I stated above?

The setup is custom so it doesn't matter which one I use, the exhaust housing I am planning on using is a 12 cm housing and running a 3200 rpm spring. I have a 3rd gen intercooler that I will be running. The motor is hooked up to a nv 4500. And I have all the necessary guages as well.

The engine is originally from an 1989.

Thanks,

Matt

[sdstriper]

The smaller inducer off the non intercooled trucks was 50mm. If there is an inducer diameter difference, that one would move slightly more air... The inducer and housings combinations can be bought up to 60mm.

More on the wheel diameters etc. here

http://www.gillettdiesel.com/turbocharg ... des-2.aspx

[aspoonhour]

Matt. Someone on here or the DTR did a Compressor and housing upgrade that I can't find. It was a fairly large compressor housing on a Non-IC truck. I wish I would have bookmarked it. It had some good info if I remember correctly.

SD...Good readin' there...I happen to have one of the "dreaded 70k's"...Mine had the 21cm exh housing. It's a 14cm now...Much better, but a 54cm comp wheel?...Been thinking about an HX35 for a little upgrade, but now I've pretty much decided. I didn't realize there was a difference between on the compressor side of the turbo used on the 21cm trucks...I thought it would be the same as my '93 was.

EDIT...Uhhh, I think I need to read some more and figure out my "terms" better...Sorry!

Thanks guys!
Andrew

[sdstriper]

60mm wheel and compressor upgrade is as big as your going to get for an H1C or HX35 IIRC.

[SChandler]

Matt. Someone on here or the DTR did a Compressor and housing upgrade that I can't find. It was a fairly large compressor housing on a Non-IC truck. I wish I would have bookmarked it. It had some good info if I remember correctly.

SD...Good readin' there...I happen to have one of the "dreaded 70k's"...Mine had the 21cm exh housing. It's a 14cm now...Much better, but a 54cm comp wheel?...Been thinking about an HX35 for a little upgrade, but now I've pretty much decided. I didn't realize there was a difference between on the compressor side of the turbo used on the 21cm trucks...I thought it would be the same as my '93 was.

EDIT...Uhhh, I think I need to read some more and figure out my "terms" better...Sorry!

Thanks guys!
Andrew

Andrew, is this the one you were thinking of: http://www.1stgen.org/viewtopic.php?t=3698?

[aspoonhour]

Nope. I recall more pics...Hmm....

Andrew

[SChandler]

Hmm, well, if you find it let us know.

[mattme]

Thanks for the info. Gillette's site has a lot of good info.

I have not been able to find any concrete data as far as boost numbers, flow rates, efficients, power differences.

[fergavs]

Very hard if not impossible to state boost expectations and performance increases. How would you state this info. If you had this many turns on the full fuel screw with these injectors at such and such an alltitude? It is not possible. The most common stated info is how many lbs./minute of air it is capable of supplying and what its maximum efficent boost pressure is. This is not the pressure to expect but rather the max pressure you should subject the turbo to. Also some shops will also state aprox hp for a given turbo and that is based off of the lbs/min of air supplied over an efficent range. Hope that helps a little with turbos ratings.

[aspoonhour]

This is thread that I was talking about...

http://1stgen.org/viewtopic.php?t=3042&highlight=turbo+housing

Andrew

[ontos]

I went from a stock 50mm wheel to a htt 58mm on my non I/C 89. Ran with better power and also cooler. Good improvement. The parts came from HTT but I think Cummins has or had the parts.

Also put on larger crossover and 4" open muffler.

[ontos]

Just as info:
What I didn't add was that I think the increase to 4" on the housing inlet made a difference. Also the crossover.
This is an a motorhome that makes it fully loaded all the time. I keep pretty good records (or my wife does. "hey write this down") I got lower boost numbers and lower egt's. Not sure how that works. More power (I think) measured buy better speed up same interstate hill, on a number of trips lower egt's.
Not sure if results would show up in an unloaded pickup.

At the time my wife had an interest in the turbo mods since they were a birthday present to her. Now she mostly is waiting for me to install the I/C I got her this year.