Thread: T28 vs t571z

Can someone enlighten me on what I can expect power wise in the difference between these two? My setup will likely to an externally gated gtir Mani on my DE. I have the t28 now and was going to pick this one up. I'm just curious on the same step up using one vs the other what kind of Gains I can expect with the t517z over the stock t28.

Awww what specific t28 version you got? Wheel sizes and a/r sizes is it bb or journal?

I got the gtir stock t28, that would be journal I believe? I think they both are. I'm not sure on those sizes, I'll have to check.

T517z is journal bearing.

and probably not water cooled(I have the slightly bigger 18G on my car and its only oil,no water lines)

Yup. Have one in basement.

Yeah, i'm just trying to figure out if its worth using over the T28, or just not getting it and waiting for something better. I hear its 350hp capable fairly easy. But not sure it likes to go above 10 psi and im not sure how it compares to the T28 at say 15 or 16?

the greddy Turbos love boost. I think they max out around like 23-24psi before they are out of their effective range. T517z is basically the Smallest 18g you can buy. I think the compressor wheel is smaller also. In terms of spool, its the quickest. But in terms of power itll put out the least power and top end. Its basically Td05h-18g(Big Comp housing with 3" intake)>T518z(Compact compressor housing 18g)>T517z. It really just depends on what you want to do with the car....Im pretty sure all of these turbos are Still T2 framed 8cm Exhaust housing If I remember correctly though.

To me the Benefits of the greddy turbos are reliability. With those turbos you have just one less leak to worry about and less stuff cluttering the engine bay. My perfect simple setup would be one of those greddy turbos (doesn't really matter which one), Gtir manifold with external gate and E85. The Tq numbers these turbos make on our motors is crazy

I actually bought a used 18G from a forum member after reading all your post about this turbo. I have not installed it yet, but I am planing on using it on a bone stock VE. I see you had a DE+S4 and this turbo from your previous posts, and it was putting to shame a couple of V8 cars on the highway.

Do you have any experience with this turbo + VE? Any suggestions to make the install go smooth?

Also my turbo has up and down play, no in and out and it doesn't hit the housing. Should I rebuild it anyway?

Set up
Stock VE (fresh hone,new rings, ACl bearings)
W11 Manifold (plan to fly cut the bottom flange to raise the turbo for intake clearance)
Greddy 18G , (has a 8cm ex housing)
3" - j-pipe, Dp, no cat, full exhaust
550CC injectors
AEM 320 E85 ready pump
Tuning currently with Calum RT + wideband


Thanks in advance

^^^Couple things: Your going to need way bigger injectors then 550cc's for E85. If your gonna pull the pistons and replace the rings you might at well upgrade the pistons, at least, while your in there or just leave the block stock for now. E85 will save you a lot of headache there. But your going to also have to be prepared to tune on the fly like I was able to do...because Ethanol fuel is inconsistent. One tank you can have e85 and another you can have e70 from the same pump. As for the manifold Im not sure why you would shave the flange down. But I guess maybe its for your setup. My intake fit perfectly. The GTi-r manifold flows better. But from my understanding its more of a pain in the ass to take on and off where the Avenir is very easy to work with. As for the shaft play, its a journal bearing turbo so itll have that. My brand new 18g even had shaft play.

Never got a chance to put one on a VE. But its the same basic steps as a DE.

I probably read every thread on every forum that there was on the 18g. There are guys that say the turbos are only good for 250whp lol and then there are gus with Dyno Sheets of the turbo on a 1.6 vtec motor making like 440whp lol. There wasn't much info when I got my first 18g so I didn't really know what I had. Now after playing with it I can tell you it is a perfect street car turbo that's a beast on high boost.