How to tell t3/4 from t4?

[Jeff240sx]

How can I tell the difference from a t3/4 and a t4? Can someone post pics of a t3/4 and a t4?
Thanks!
-Jeff

[AceInHole]

standard T3 (http://www.mjmturbos.com/T3.htm)
http://www.mjmturbos.com/images/T3.jpg.jpg

T3-T4 (http://www.mjmturbos.com/T3T4485054.htm)
http://www.mjmturbos.com/images/T3T4485054.jpg

If you can't tell, the T3-T4 has a larger compressor housing than the turbine housing.

A whole lot of turbos (http://www.mjmturbos.com/CarTurboDescription.html)

[Jeff240sx]

OK. I have ebay pictures, and I'm kinda confused.
I bought my turbo from some kinda shady shop (DA Performance) that has since gone out of business. Now that I have seen lots of pics of turbos, I am wondering what the hell I have.
This looks identical to my turbo, and it's a t4:
Here (http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=2401022067&category=33742)
Downpipe flange I do have (for my .48 housing) (http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=2401606915&category=6771)
Similar (no bolt) exhaust housing my .84 housing has (http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=2401522226&category=6770)
Then this t3/4, and the others I've seen look like this one:
3rd Pic. Housing and funny flange I don't have (http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=2401588117&category=6763)
Downpipe gasket and flange I don't have (http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=2401237789&category=6770)

So. How can I tell for sure?
-Jeff

[Jeff240sx]

My turbo doesn't look like a single one of those t3/4's on the site. It looks like this, without a big-ass intake side:
This one (http://www.mjmturbos.com/T04E70.htm)

Here are a couple pics I have. You'll have to copy and paste the links.
http://jeff240sx.freeservers.com/engineright2.jpg
and
http://jeff240sx.freeservers.com/holdingturbo.jpg
Sorry. It was 4:30am after a couple sleepless nights. It was the "sh!t-eating grin" pic.
What do you think?
-Jeff

[[email protected]]

jeff you have a full T4. that is an "on center" T4 turbine housing.

and if its from xs engineering's kit or nsport, its a To4B compressor.

[Jeff240sx]

So how can I tell what compressor I have then?
I ordered the t3/4 from DA Performance, who was shady when I bought the turbo, and went out of business just after I bought the turbo.
I was told that I'd get a t3/04e. Then after about a month, they said that they didn't have the correct exhaust housing, ect. and they'd send me a different, more expensive one for shipping purposes (to not damage the blades). I then recieved my turbo with a .84 exhaust housing, and about 4 weeks after that, I recieved the .48 exhaust housing that I'm using now.
How can I tell if it's an e compressor or a b compressor then?
And does this explain why my turbo didn't spool untill 3600?
-Jeff

[[email protected]]

3600 full boost is normal. actually quite good.

the way to tell what compressor you have is to measure the major and minor diameters of the compressor wheel. meaing the big and small of the compressor wheel. report this info to me and i'll figure out the compressor trim.

[AceInHole]

well... does he mean full spool by 3600 or he starts to build boost by 3600??

[Jeff240sx]

Well, before the engine blew, it was full boost. All 4psi that I'm sure didn't take that long to make.
-Jeff

[d240t2]

Hehe...mine made 15psi of boost at 3800rpm on the dyno! I can't wait to get that .82 A/R housing on there and get some more lag.

Dennis

[[email protected]]

you wont like it......driveability will go down. i hate driving my high strung sr. my stockish 150hp ka however is loads of fun. i'm amplifying the fun x 15psi soon.

well yours with the .82 may not be that drastic but.......

[MyFirst240SX]

Originally posted by d240t2
Hehe...mine made 15psi of boost at 3800rpm on the dyno! I can't wait to get that .82 A/R housing on there and get some more lag.

Dennis
whats your setup and what did you dyno at?
thanks

im going to try to compile every dyno and setup, and quarter mile i can then make it into one huge website

[d240t2]

350rwhp at 15psi of boost. Peak power at 5800rpm. Stock bottom end KA+T, T3/T4 turbo, stage 3 turbine wheel in .63 housing, 50 trim compressor (at time of dyno), MSD ignition, 2 91 exhaust cams, 1 modified to use as an intake cam with decreased overlap, Apexi GT Spec exhaust, etc.

I made 307rwhp at 14psi of boost with the silencer in the exhaust, then picked up 43rwhp by removing the silencer (also picked up 1psi of boost).

Dennis

[240racer]

Dennis,
when you say stock bottom end do you mean everything but pistons, or did you also change rods and you mean crank? I'm planning on only swaping pistons on my rebuild, running with stock rods. Looking for 300rwhp or so. I'm not going to up my rev limiter either. I have '91 cams, do you think there is something to be gained from running other cams? Have you tried with stock '91 cams and then with both being '91 exhaust cams and seen a difference?

thanks

[[email protected]]

stock bottom end means stock rods and pistons. in this case his car has a stock bottom end

[MyFirst240SX]

thanks dennis, i have to make a web page for one of my classes on anything i want so i thought what better than a 240 site with all types of setup's compelled into it
sean

[d240t2]

when you say stock bottom end do you mean everything but pistons, or did you also change rods and you mean crank?

When I say stock bottom end, I mean just that. The only things internally that have been changed on my motor are the cams. The head has never been separated from the block since it left the factory.

I'd like to build a pistons only motor one day down the line...maybe, if an RB25DET project doesn't come up sooner.

I haven't had an "apples to apples" comparison of the 2 91 exhaust cams vs stock S14 cams. I had stock 92 cams in my old stock 92 turbo motor in my old black hatch...but that was a different setup...lower boost (back in the day when it wasn't safe to run more than 5psi of boost, according to any source).

Dennis

[Foxcolt]

Originally posted by d240t2
When I say stock bottom end, I mean just that. The only things internally that have been changed on my motor are the cams. The head has never been separated from the block since it left the factory.

I'd like to build a pistons only motor one day down the line...maybe, if an RB25DET project doesn't come up sooner.

I haven't had an "apples to apples" comparison of the 2 91 exhaust cams vs stock S14 cams. I had stock 92 cams in my old stock 92 turbo motor in my old black hatch...but that was a different setup...lower boost (back in the day when it wasn't safe to run more than 5psi of boost, according to any source).

Dennis

What do you use to tune fuel?

[240racer]

Ok, I'm planning on running pistons only since I don't see how the rods are going to break. I'm not going for tons of power, 250rwhp for now and maybe 300 or something in the future. I'm kinda trying to figure out why everybody thinks you need to change rods? Do they just continue to pass information down the grape vine or does somebody have some real actual experience with the rods having problems. I would think that 100hp per rod isn't too much to ask, especially of an inline that isn't revving higher then stock. I can see if you are revving higher, then the rods are seeing alot more stress, but there isn't a reason that I can see to rev higher since everybody is getting peak power at 1000rpms below redline.

[d240t2]

You'll be fine at that power level on stock rods. The stock rods are forged and shotpeened from the factory, so they are pretty strong

Fuel system is unStable Hybrids fuel rail, MSD top feed 50lb/hr injectors, JWT ECU, Granatelli Cobra MAFS (blow through). No additional tuning.

Dennis