So as best I can tell there are two versions of the GT2560R: the 466541-1 and 466541-4. The -4 has a Ni-Resist turbine housing and an Inconel turbine wheel. The -1 doesn't. I don't know what the turbine wheel on the -1 is made of.

Both are exactly the same price.

I am having a hard time finding a description of what the trade-offs are. There must be trade-offs if the price is the same and both are available. I assume the Inconel wheel is stronger at high temperatures. I am guessing it is also heavier, but since I don't know what the other material is I don't know for sure.

Which one is better?

Intended use is street & occasional track days at 8/10ths.

 

In all honesty... I think you will be okay with either. Inconel is just a different alloy that is more resistant to heat than other alloys. They are common in WRC due to the heat produced by their anti-lag systems. The Inconel wheel depending on the alloy will add more cost typically. Ceramic is bad...

 

The fact that they cost exactly the same is what's confusing me more than anything.

 

Actually, the Inconel -4 CHRA is slightly cheaper (<2% difference, but still) than the -1 CHRA. Full assemblies are the same price. Weird.

 

You could just call the techies at Garrett. They would be more than helpful.

 

The GT25/60R is the standard turbo on the Australian SP turbo Mx5. All the motorsport guys over here running 2B production sports car specify the inconnel version for durability.

 

why not date men?

 

I thought turbine wheels were typical made of Monel. You should PM JKav, I'd love to hear the answer.

 

I enjoyed our date together, it was a hot night. I'll never forget the beef we chomped down.

 

Do you have a contact there? There's no phone number on the web site and I can't imaging calling Honeywell HQ is going to be very useful.

I've tried emailing a few distributors and haven't gotten a reply.

 

Well Kday it seems that I gave you some less than informed advice. I apoligize. I tried to contact them and all I got was the advice to read there tech articles and then contact one of there distributors.
Globalazation has taken us from a service oriented Republic to a **** you Corpocracy. C'est La Vie! C'est Le Guer!
Sorry.

 

Hey, no problem, it was a good suggestion, since my inclination is to avoid the telephone and it hadn't occurred to me to look for a phone number.

It's peculiar that this is not common knowledge though. Maybe I should cross-post it on m.net?

 

Well, I ended up getting the -4 version. Here it is next to a broken 2560 out of a Nissan, note the different casting for the turbine housing. I don't know if this was a running change for both the -1 and -4 turbos or if it's unique to the -4.

 

Considering the kinds of EGTs a lot of people run, I would jump at an inconel wheel.