alltimenomoney

I almost hate to ask these two questions as there are a lot of posts on here about them

I have read all the info and from what I can tell the stock HX-35 on a 97 Manual truck is a 12cm WG...am I correct and is there an external way to tell

I also am looking at picking up a HT3B for twins but when I called a few places they all want to know the CPL off the engine.....Is there a specific number or does it really not matter

The other question I had is why could you not run an external wastegate to bypass the HX35 rather than modifying the factory one..I know it means buying two wastegates but I can't see why that wouldn't give you much better flow to the second turbo

Thanks for your help guys

plow

97 5 speed cpl number is 2175. The turbo is wastgated, if your asking if there is a external way to tell if its wastgated then yea, you can see the wastgate right below the turbo it has a rubber line attached to it that runs up between the valve covers and connects to the afc.

alltimenomoney

I know mine is wastegated but I was wondering if there is a way to tell the housing size

The CPL they keep asking for is for the HT3B engine....I am not sure if it matters which highway tractor CPL it comes from or not

This engine is in a 1986 crew cab and I want to work on getting twins on it so I am looking for a HT3B to start fabbing them

Artsi_L

Housing size is cast in the turbine volutile mouth. Wipe off some soot with your thumb at volutile entry, and you'll see the sizing number/-s right there.

What I've read on forums, HT3B folks seem to favour 26cm² size housing.

Mike Holmen

If your gonna run a Hx-35 with a 12cm housing I would suggest looking at PDR HT3B/22cm turbo. I don't think that its all that expensive and should work well for most set-ups.

alltimenomoney

I would think a 22 cm would be ok.....not looking for ultimate power just good towing and EGT

Is there a specific model or CPL cummins that has a 22 versus one that has a 26 or is it just hit and miss what you find??

Appreciate the help guys

Mike Holmen

Phone Piers and talk to guys there. They will set you up on a killer turbo. They have to do some machine work on the turbo to get the turbo down to a 22cm. I was told this as I was looking at there towing twins or a street kit. Hopefully this is still valid today. I don't know what size they put on their 3gen 700rwhp truck. A cam is also a nice addition to twin turbo. The spool-up time is determined more by which secondary turbo that your using. Twins will spool slightly slower but nothing that will scare you off from using twins. Once the primary turbo lights, you have to hang on. Mine starts pulling hard after 20psi. It has a nice turbine whistle. At about 50-60psi its starts to growl. It sound that you will fall in love with, trust me