I think the horsepower numbers are off on the GTK series, that GTK-550 looks to be the same size as the HP61.

Personally, if I had it all to do over again, I'd just have stuck with the GT3076R, or maybe looked at the GTK-450.

 

Yeah, I know, and they're called snails too, I'm not that much of a noob, but thanks for explaining it.
We had really big ones on the trucks I used to work on, even sequentials and I have changed quite a few.

Mchat; IMO you cant tell a whole lot about a turbo by looking at it other than relative size, there is so much technology buried in blade angles, metal compostion, scroll area, port shape, drive to driven ratios, bearing design/quality etc. Its like looking at 2 blue '69 Camaros with fat tires and side pipes and surmizing which one is faster without knowing what's under the hood. You really cant tell without ALL the numbers and knowing science behind the numbers.

 

oh then i was just confused about your statement lol

 

No I was really just wondering if you had big hair. I'm just being a guy.

 

Meh, most of what you read online (and even what the "engineers" know)about all of that stuff (blade angles, metal compostion, scroll area, port shape, drive to driven ratios, bearing design/quality etc) is all theory. The best way to see how a new turbo works is to bolt it on and test it out.

Having said that, the reason why I say the "estimated HP" figures Turbonetics has released for their GTK series are off (to the low side) is because these turbo's are supposed to be an improvement over the "older" turbo's yet their "estimated HP" figures are considerably lower than "older" turbos that are the same size.

For instance:
The GTK325 is estimated at 275-375hp. It is basically the same size turbo as the .50trim which has produced 400+ whp on pump gas and 500+ on race gas. I would expect the GTK325 to spool up quicker and hold the power longer given the marketing hype behind these turbos. So I don't understand where the 275-375hp rating would come from, IMO we shouldsee these turbo's put down closer to375(pump gas)-475(race gas)whp on the average car.

Until more people run these turbo's and put down some numbers on the dyno, we won't know what these turbo's are truly capable of.

The difference between theory and reality is that in theory there is no difference, in reality there is.

 

haha no i don't have big hair. in fact i have very straight hair lol

 

UPS says my package has arrived... I can't wait to go home and stare at it..... should I call out of work tomorrow and do the install in my garage or wait until this weekend where I can use a lift ?

 

make sure u post pics!!!!! i wanna see it too

 

Well Amy, if you get one of them big hair dryers, you might be able to have big hair.

Yeah Mike, it looks as if they're not being too commital with a claim of 275 to 375. That's a pretty broad range. As I sit here and think about it, I have to wonder what standard test engine they are talking about. A Honda 4 cyl? I mean, I can easily come up with a scenario that could shoot those numbers all to hell. Like suppose I build a 440 v-8 to be blown. With good heads, cam and all that, I could easily achieve 400 hp with no blower at all. I'm just guessing that if I was to bolt on even a too small a turbo like the GTK 325, I'd be able to make somewhere over 400 hp. Now maybe I'm wrong and it would restrict the intake and exhaust to limit me to 375, if they're right, but it sure doesn't seem likely. IMO, they probably hate to put a hp rating on thier turbos because of the infinite possible engine combinations they may be used in. Marketing probably demands it because everyone wants to see a big hp number. So I'm guessing 275 to 325 would be for the majority like maybe 90%. There's always gonna be a few that will get more or less.

 

i think that when they estimate the HP. Its throwing it on a stock car with just the turbo. unless it specifis what is all done.