Hey everyone, I'm having my shortblock finished up, and needed to purchase a turbo. I began my research a few days back and ended up calling Comp to get some more info. I spoke to the rep who had nothing in my price range of $1200-$1500 but had a returned item that he could discount for me to meet my budget.

Anyway, I ended up purchasing the turbo, but I cant find any info on it anywhere, and being new to the LS world, I'm taking baby steps to learn all I can before moving onto the next piece of the puzzle.

It's called a CT43-XR 8085. I know it has ball bearings and a billet wheel, and I know the wheel sizes obviously, but I was hoping to find a flow sheet or someone out there who has used one and could compare it to a BWS480 or some of Precision's stuff.

This is replacing an On3 Performance BB7675 as I transition to from a 5.3 to a 6.0 stroker.

Thanks

 

My suggestion is you call Tom S. at Turbo Resource in Lake Havasu, AZ.

Lance, BTW sounds like a Garrett #

 

Return it. That is all.

 

according to comps website it's got an 85mm turbine and can either be a t4 or t6 depending on which a/r housing you have.

 

I know the wheel sizes, material, and most of the specs of the turbocharger itself. I just can't find any flow information so I can get an idea of how it will stack up to to the On3 8883 I was originally looking at.

 

as far as i know comp doesnt give out compressor map data

 

Are there compressor maps for the Chinese turbos to compare too? I've had trouble finding compressor maps for many turbos. BW seems to be about the only one with good data available for all of their turbos?

If you know the sizes and the specs of the turbo charger itself it will flow similarly to other turbos that have similar wheel sizes, trim and housing AR's etc. from different manufacturers. There really is no magic in a name. I'm guessing it is not in the same physical size range of the BW S480, and I probably wouldn't expect it to perform like a BW.

I would not assume the 8085 is the wheel sizes of the compressor and turbine. That turbo is custom made and there are 6 different compressor wheels they use, 3 turbines as standard, but there could be custom parts in it as well. I don't think any of the standard wheels Comp uses are 85mm? The 3 standard turbines, I see they are building with are 67,76 and 79mm. They have something like 24 different turbine housings you can order in different AR/divided/non divided combinations and configurations. There are ported and standard compressor covers. That is truly a custom piece they probably put together for someone, and then they chose to go a different way. Without knowing all of the specs we can't really cant help with this.

You may have a bit of a gem there? or it could be a little mismatched to your goals. You didn't say what you were looking for. Did you want a turbo to spool up quickly or for max HP? Depending on the specifics of the unit you have, you will have one or the other, so that part is kind of a crap shoot. That turbo is available with a 0.81 AR housing which will light off really quick on a 6.0, even with the biggest turbine, or it could be a 1.32 which would spool considerably slower, but give you more on the big end. You could swap out the turbine cover easily if it is not what you were looking for.

I have however heard good things regarding the reliability of comp turbos. What I've heard is the Chinese ones are hit and miss. Some people have great luck with them, others not so much. I've never wanted to run a Chinese turbo myself, but the price is tempting.

I spent some time researching Comp turbos, when I was shopping, and sometimes I wish I had gone with a Comp. I may end up going that way someday in the near future.

 

Thank you very much for such an in depth reply. You are correct. It was a custom built unit a customer returned when they decided to go another route. Comp refurbished it and put it on the shelf.

I actually called Comp asking about one of their journal bearing turbos since it was about the only thing I figured I could afford. I wanted a little more info before I pulled the trigger on an On3 88mm. Like I mentioned earlier, I told him my budget and he said there was nothing offered in the size I needed for that price. That's when he mentioned the refurbished one. Apparently it's nice. I haven't even seen a picture of it, but it's supposed to actually be an 80mm compressor wheel, and an 85mm turbine wheel. I wish I knew the inducer/exducer size for both, but it was the end of the business day and everyone was scrambling to start their new year's break. If uunderstood him properly, it has a 1.00 A/R turbine housing and all of the bells and whistles Comp does with the billet wheel and triple ball bearings and stuff. The weird thing is, the part number he gave me goes to an oilless turbo and I don't think that's what this is. He mentioned oil cooling for sure. Anyway the part number is 434X8085