Replacing my China T04e hunk of shit
 

My current specs:
https://www.miataturbo.net/attachmen...1&d=1407985486
stock 1.6L
627cc EV14 GT500 injectors
Toyota COPs
Megasquirt II
homemade log with external wastegate
ebay intercooler & bov
2.5" downpipe with 3" exhaust (homemade)
China T04e .63 a.r. with these specs:
Compressor Wheel
0.50 A/R Cold Side
Ind: 52.76 mm
Exd: 75.46 mm
Trim: 48.9

Turbine Wheel 0.58
Ind: 57.75 mm
Exd: 73.35 mm
Trim: 61.9

I am running this setup on 15psi and I'm getting full boost at around 4300rpm. Fun on the highway, but not ideal. Turbo is oversized.

I had good luck with the longevity of the ebay turbo, so I figured I'd give another a try. I'd like to keep my T3 manifold.

I would like a turbo that is fully spooled at around 3500rpm while keeping the same type of top end power I am getting the T04e now(no idea what power I'm making now). I would like the turbo to be capable of 300rwhp (ish) and not suffer power drop off like 2554 and the like do.

I was reading about Brain's T3 endeavors (.48 a.r. hot side, .42 a.r. cold side) and I like the power he made (240ish rwhp @ 15psi?), but would I experience the top end drop off?

What about if I went with a .50 or even .60 a.r. cold side?

Unrelated, but why do you have your valve cover breather connected to the charge pipe? It might just be the picture but you should disconnect that immediately.

It's just hanging there, not actually connected, never got around to getting one of those tiny filters/breathers. I'm not pressurizing my crankcase

I think the turbo brain used is definitely a decent one for what it is, though I'm thinking it might have to be run full tilt to hit 300.

I don't think you're gonna find the "best of both worlds" here though. The only turbo's that will spool really good and make really good power all cost a pretty penny, not chinachargers.

Full tilt, like 25psi? I understand that it's a big expectation for a China charger to spool quick and make good power. Any idea what my current setup should be making? I would just hate to switch and have the car feel slower

GT2560 or GT2860 .64a/r

Wrong flange and internally gated

go do a virtual dyno log and post it up. no need to guess

Garrett GT2860RS Turbo aka 'Disco Potato' - Full-Race.com

There's definitely a t3 EWG option for the 2860 at least. I'm interested in what you find though, cause I am thinking along the same lines for my car. I have pistons/rods but don't want EFR crazy 400whp, but would like a bit more than the brain 50-trim.

potato won't spool at 3500 on a 1.6, and definitely not with the t3 hotside IMO

What software do I use for that? Can I use TunerStudio logs? The car has the engine out right now

I'm looking at eBay turbos, trying to keep it cheap. And might as well use an external gate since it's there.

Buy the $200 50 trim chinacharger T3 I was using and win at life.

I think Gospeed is the vendor that sells it now. It'll spool like a T25 and can support up to about 300rwhp with enough boost.


It'll make enough low-end torque that you can actually blow your shitty 1.6L rods and will be able to swap out in like 15 minutes.

Yeah but with the same a/r a genuine BB turbo will spool better than a journal bearing churbo. How much better I'm not sure, I doubt there are many people who run a T3 EWG potato on a Miata.

I like Braineak's idea though. Get the T3 50 trim and see how much boost it will take before it asplodes so I know how much to run later ;)

Yes, you just plug in a log from MS, but it had to have been on a straight/flat/level road, in I think 3rd or 4th gear. Search "virtual dyno", we have a whole thread about it here. Its free.

The bottom line is I don't think you will find what you're looking for. You will either have to compromise spool or power.

But if anything, get the turbo that brain had cause it seemed to actually spool decent.

Is this what you had?
http://pages.ebay.com/motors/link/?n...928871&alt=web

that looks like the EWG version of it, yes.

had a 42mm/60mm compressor wheel.

Since you don't need the wasgate actuator and v-band wastegate, that looks like a better deal for you. You might just need a different coupler off the turbo to your IC pipes since it flares up to like 2.25" IIRC, but other than that, you should be able to swap it fast. I was able to bolt mine in, on my BEGi manifold, on a lunch break.

Just be careful, that looks like a 4-bolt outlet, not the standard 5-bolt T3 outlet your DP is probably built for. you'd probably have to drill/tap two holes on it.

I noticed the dp, I wonder if I could drill a hole in the flange of the dp where the 4 hole is. It seems most of these use 4 bolt do, but I'll look again

that would be easier if you have the room on your flange.

Similar specs, 5-bolt exhaust (not sure if it's the standard T3 though). Much cheaper.

T04E T3 T4 48 A R 50 Trim Turbo turbocharger Compressor 300 HP Boost Stage III | eBay

spec aren't even close. good luck with that shit.

this is a stock motor?

Yes, but i don't plan on going full retard until I put the rods in

so don't buy an oversized POS turbo.

I already have a POS oversized turbo. That's why I'm considering the turbo you suggested and running it around 15psi until I finish rebuilding my spare motor where I could utilize it turbo to its full potential.

I don't think its worth it. Just my .02

Stick with what I have for now?

might as well if the replacement is equally bad

if he picks the right replacement, then it will be so much better he'll paypal me money for just leading him in the right direction.

Has this ever actually happened? ;)

I went ahead and pulled the trigger on this. Should be here quick as it's coming from Indiana and I'm in Chicago

cool beans.
please make sure to quantify your results this time.
for science :party:

actually, yes it has.

4th gear spool/boost log?

yeah that's a good start. starting at 2k rpm, and on a flat road. so we can look at what it's doing as well as plot it out in VirtualDyno (per that thread).

I love comparing people's setups/results. Its fun :)

before/after boost plots and 3rd/4th gear pulls would be great.

your post talking about how fucking awesome i am for pioneering this turbo will also be appreciated.

Emilio sent out my clutch so I should be able to start putting it back together next week

I have the car apart with the engine out, so I will not be able to post before data unless I can find an older log. Any easy way to determine what gear the log is in?

Turbo is here. It is not seized or broken in half. Always a good sign right?

Looks small compared to old turbo. Came in Emusa branded box.

What do people run for filters on such small inlets? I was running a vatozone cone, but it will be too large in diameter even with their adapters.


Attachment 235549Attachment 235550Attachment 235551Attachment 235552

My potato on 1.6 was 4,000rpm with a 0.86 a/r hotside and the super unequal length lovefab manifold I had at the time. Boost threshold was like 2 grand though, so it was quite fun to drive.
with 0.64 AR t2 housing and a short runner manifold you could probably get close to 3,500.

t3 housing you will need a small a/r to make 3,500rpm spool on a tater, and then your cutting your top end down.

large diameter intakes are the best.

here's what mine looked like:

https://www.miataturbo.net/attachmen...ine=1408370045

2.5 to 3" elbow to a 3" RU-5111 filter that was under my begi cold air box behind the headlight.

You can likely find an appropriate sized adapter on ebay or similar. you will need the coupler to fit the turbo inlet and your filter as well as a short aluminum piece at the bare minimum to fit both the coupler and the filter.


There is always an adapter coupler that will work. if its a metric diameter, you can get the couplers without the inner braid one sized down and stretch it on. Its the inlet side, so there will be no boost to balloon it out. If you do this, it will be floppy, so you will need to brace the filter to either the engine or the chassis somehow.

dont put a filter directly on the turbo.

I suggested basically what you have, but in words

I guess I'll just sort that out when the engine is back in the car so I can see what will fit. Clutch is supposed to be here Wednesday

Any update on this? I'm running a similar sized turbo on my 1.8 (t3/t4 w/ .48 ar turbine and 71mm compressor exducer) and it's fun but the spool leaves much to be desired. Really considering picking this turbo up.

stop talking about it and just do it.


here's a link for you all to read: https://www.miataturbo.net/build-thr...-yellow-48386/

notice on post #7 he shows off his T3/T4 chinaturdo.

then 30 days later he switches it out for the turbo I, your humble admin, suggested in post #49. I think this sums it up:


his dyno results were what I expected, but he was giving up a bunch of midrange (compared to my setup) by ingoring my suggestion of going to a 3" exhaust: https://www.miataturbo.net/dynos-tim...y-setup-56729/

220tq and 250hp on a dynojet.


So keep on fighting the urge to run a good cheap turbo and enjoy your slow-spooling, slow, pos, no-torque setup.

Make sure you check torque on all your CHRA bolts.

Shortly after I made that post I went ahead and bought the turbo. I will post comparison logs in a week when the it gets here. Also, for anyone looking to buy this turbo, I offered eBay seller racingparadise $200 (They were asking $220) and the offer was accepted.