A true 50 trim t04e measures 53.6/76.2mm, most ebay 50 trim t04e's you'll find don't have those specs.

Take this one for example, says t04e 50 trim. Description says 48.4/64mm compressor. That's not a 50 trim T04E, it's closer to a T3 super 60 wheel than anything, not even quite a T04B. If we go back to the turbo master chart we can't even find anything close, no idea what they were copying there...

T04E T3 T4 48 A R 50 Trim Turbo turbocharger Compressor 300 HP Boost Stage III | eBay
Compressor Wheels - Garrett Racing - Applications - TurboMaster

Then there's this one, also supposed to be a 50 trim T04E with a stage 3 garrett turbine wheel (56.6/65mm)

Stage III Turbo Charger T04E T3 T4 T03 T04 63 AR 50 Trim Boost Camaro Corvette | eBay

The turbine is dang close, but the compressor is half wrong. It appears to be some super duper t04e, close to 446618-0024 on the list above.

How much of a difference it will make, I can't say for sure. The only way you'll know you have a t04E 50 trim is gonna be buying the bits and putting it together yourself, though. Maybe buy one of these $130 "t04e" turbos, then swap the cold side later if you are disappointed? A 50 trim t04e compressor setup should be easy to find, pretty sure Garrett sold those over the counter to individuals at some point.

http://fc3spro.com/TECH/TURBO/tmodels.html

Oh, yeah. I'm building a 39 trim t04b for my 1.8, the last post in my thread has links for what I've bought since I'm only going for 300-350whp. I have a near "stage 2" turbine t3 off a perkins diesel, with a 45 trim t3 lol. Deffo made for a low revving diesel. No wonder we are all spooling ebay 50 trim t3's so quick!

On your second link, that looks like a pretty good one. 54mm compressor inducer, 56mm turbine exducer, 0.63 AR. Based on my understanding that compressor/turbine goes together well, would you agree? You mentioned the compressor is 1/2 wrong, what's off on it?

That turbo is only 130 shipped, so I'm interested.

Quick question. Comparing that one vs this one: GT3037 GT3076R T3 Huge 4 Bolt 500 HPS Turbo turbocharger 73 A R 60 Compressor | eBay

It looks really close, same size turbine wheel, 0.73 A/R turbine so a touch larger, but the compressor is a 57.48mm inducer.

My guess is this one would be a bit laggier, but capable of making more power since it has a slightly larger A/R turbine, and 57.48mm vs 54mm compressor. Am I missing anything in comparing these two? Which of these would you recommend for 400whp without having a turbo fail from pushing it too hard?

Actually, slight revision, looking at this version: 360° Thrust Bearing GT30 GT3076 Universal Performance Turbo Charger 0 63 A R T3 | eBay

That should do 400whp, yeah?

Should work alright. Here's a 3076R map...

http://www.thesuicidaleggroll.com/ho.../3076R_map.jpg

Here's a compressor map calculator, to help put points on that map.

http://lovehorsepower.com/joomla/ind...tuff&Itemid=49

yes a 500hp turbo should be good for 400hp :P

Thanks deezums. I used the link to make these graphs of my old turbo and the 3076 at different boost levels. Looks like the 3076 is a good fit, and I may have been pushing the GT28 too hard. I ordered the 3076, the last one I linked to with a .63 AR on the turbine.

That's what I'm thinking, should do 400 without any problems.

https://cimg0.ibsrv.net/gimg/www.mia...e084009316.jpg

I actually think the china t04e is pretty good, at least on my redblock volvo...my cam is actually matched really well to a turbo this size.
Smaller turbos means more heat, higher boost means super heated air flow...the bigger turbo can do twice the work with much less heat and stress on the bearings.

Cheap bay turbo ($200 shipped) 600+ hp?

That manifold is not long for this world.

Also yes bigger turbos work less. But they spool slower, make less low end torque, and have worse transient response.

Most people here aren't doing the silly half mile races a big turbo would be good for.

You are more than correct about the manifold, i used the factory cast instead.
The exhaust flanges on these are manufactured upsode down for some reason. After cutting and flipping it i was obvious that it was junk... $100 lesson learned.

As far as the turbo size, you can change your cams to help with that...i have a modified auto trans waiting for a hi stall converter (3000+) so for my set up it makes sense everything happens at about 3k , boost is on, cam is ground for 3000 to redline but honestly i dont think it had much lag....let me go look at my videos...

Totally different motor. No chance in hell you get full boost at 3k with a turbo that size on a miata. Really a turbo of any size. Even my small td04 doesnt hit full boost until 3500ish.

The thing about big turbos is first gear sucks...
But the reward after that is well worth the wait..

What boost level are you pushing?

I live my life 1000RPM powerband at a time.

builds compound turbo setup for broad powerband
upsizes both turbos to not hit til 5k
#becausePat :D

builds compound turbo setup for broad powerband
upsizes both turbos to not hit til 5k
#becausePat :D

Did you happen to visit st.louis for a fuel injection class?

LOL.

Totally not my thread, but I suspect my new ebay turbo will spool similar to the old one, or at least make the same power to the wheels as the old turbo as it spools. Also 2% chance I'm going to use a different turbo up front.

He did not. I was out there earlier in the year for a MS Tuning class.

A local guy named alex told me to join this forum to learn about ms he said someone here was the "man" about tuning, he had nithing but nice things to say, are you the correct person? Honestly i didnt even have a clue they offered this class...i sure would have gone