My T3 upgrading with a T4 Front Compressor! Pics

[diegom6]

What is the compressor wheel? All you know is that it has a "B" cover. It could have many different wheels. What did it come off of?
Todd

Really don't know... there is some way to knw if is a sing in the impeller?

[skat 325is]

Sounds like a T04B but you need to know the specs of the compressor wheel.

"Hello Lag"??????????????

We are using a T04E-50 with a T04 exhaust housing with .58 a/r. This turbo is perfect for a 2.5L. With 3" exhaust, lag will not even be an issue.

Diego's tiny T3 exhaust side with .48 will choke that engine big time.

Todd

Yes, that exactly what i'll be using T04B .60 with P-trim .58 exhaust with on-center flange.

[TCD]

What are you using on the compressor side?
Todd

[skat 325is]

T04b .60 a/r compressor
.58 P-Trim exhaust

The thing is i bought the turbine and the exhaust side was .96, so im waiting for my friend to bring me tonight the P.58 exhaust housing.

I'll post pics as soon i get it assembled.

[TCD]

So what compressor wheel? It's likely to be a H3 or similar since it had a .96 exhaust housing.
Todd

[whakiewes]

No one has really answered hid questions yet.

With the larger compressor, you will see the boost around the same RPM, but the larger compressor allows more CFM which in turn will create a better torque curve, and more power at the same boost level. As far as comparing it to 8psi on the T3, it is really completely different. Pushing a lot of boost on a small turbo creates a jumpy power band, and in turn is not smooth nor as exciting. Another thing to take in consideration with the new compressor is your piping diameter. If your running 2.25 or 2.5" piping, its going to be holding back the better flow of the T04B compressor, thus you won't see a different. 2.5" should be fine either way.

As to the hot sides, I don't nessacarly agree with all the comments. A .48A/R is restrictive, but it will allow him to boost early, and for certain driving styles is better. Right now, I would guess he is at full boost at around 2000-2500 rpms, and his boost dies off around 5000-5500 rpms. For drifting, this would be an excellent setup given that you can maintain peak boost at no more than 4k rpms, which adds control. This would also be a great setup for someone like diego6 who is only running 6psi. For such a small amount of boost, this application isn't bad. I do agree that if I was buying a new turbo, I would opt for a .60+A/R, as for street driving having full boost so low is horrid on gas mileage, and with a larger A/R you can still hold boost at low RPM's, but still push boost closer to redline. A lot of the E36 guys with turbo S50/2's are running .82A/R's and they see significant boost around 3500rpms, but a lot is regulated by the boost they run. One guy is boosting 27lbs, and doesn't see full boost until 4200 or later on the TO4R. We have to keep in mind of several things though such as exhaust sizing, bends, boost leakage, intake piping diameter, intercooler sizing etc..all these help to determine what turbo, boost, and A/R's etc...you need...you can't just buy a turbo that someone tells you, buy an intercooler off ebay, and make some piping at home and expect to know/have everything.

Wes

[diegom6]

yeah, you are right, thanks for the explanation too...

Don't remeber my pipes diameter, I will messure it tomorrow, from what I can remeber( I think the pipe of my IC is 2.5") wich I use the same diameter in al the other ones, I used the exact size pipe from the out let front compressor where the air compressed exits, I'm keeping it in the same size, cuz I messured the T04 .60 A/R outside "outlet" discharger diameter and messures exactly as the .42 A/R except that the .42 A/R is tighter or smaller the inside diameter, wich means the tube wall of the compressor is thicker over the T04 compressor...

my currently IC is this one, yeah I know it suck and has poorly efficient work, but it was for test and didn't know at that time much about turbos...







I was considering to upgrade soon my IC, I will put a front IC , but stright, what do you think about this one?? looks nice





sorry for post many pics.. :oops:

Thanks

[TCD]

What is "boost leakage"? A larger diameter compressor wheel with similar trim takes longer to spool. That is a fact.
Todd