My T3 upgrading with a T4 Front Compressor! Pics

[diegom6]

Well, while I'm taking down the head since I blew something in my m20(don't know what is yet) , I took my currently Garret T3 with .42 A/R front compressor, the mout messures around 4", then, I decided to go with a garret T4 front compressor wich messures the mout arround 6" new plate and new impeller wich is like 2" bigger than the previous impeller(T3)

My main question is, what advantages I will get over the smaller one at the same PSI ( 6 PSI) by now...(soon will be more)? How about the lag? will suffer?

I'm not changing my rear compressor niether the impeller, wich is stock I think is .48 or so...with internal wastgate.

Also in 6 PSI range I will get colder air than the previous one?

Here are some pics of my T3 with .42 A/R. Tomorrow once is done the conversion I will take some pics and then paste it here.






Thanks !! :D

[Rob]

so you blew something, and a bigger turbo is the fix? LOL, have fun

[grapedrink]

i don't know alot about turbos but if you are keeping the same exhaust and upgradeing the intake side you will be pusing more air. at 6lbs it will probably feel more like 8 or so. you are just pushing in more air.

[diegom6]

so you blew something, and a bigger turbo is the fix? LOL, have fun

Thanks! :D but the a bigger turbo is not the key to fix it, I did something that I never had to do, turn up the PSIs look here---->> http://www.bimmerforums.com/forum/sh...hreadid=166863

If I'm taking down the head right now, why not make the upgrade at my turbo while I was thinking of doing this time ago. it's my chance!

;)

[TCD]

What are the specs on the new compressor? T04B cover or T04E? Which wheel? Without knowing you are just rolling the dice!
Todd

[decay]

i really think you're gonna want a .60 AR hot side to go with that t4 compressor... .48 is too small even for a big four-cylinder, let alone a small six. that'll probably have more lag than the ford turbo you have now, but if it doesn't hit full boost before 3K, something else is wrong.

some of the ford turbo4's had the .60 hotside- i think you'll be wanting to search for an early t-bird turbo coupe for a direct-swap turbine housing. get a t04e 50-trim compressor on that & you should be able to spank a chipped 1.8t.

also check e30tech.com for bimmerjim's turbo write-up... from what i remember reading he had problems near 10psi as well. needless to say, you should find out what killed your engine (too much timing/not enough fuel/etc) before dumping money into an upgrade...

[diegom6]

What are the specs on the new compressor? T04B cover or T04E? Which wheel? Without knowing you are just rolling the dice!
Todd

I'ts a Garret T04 compressor, the diameter of the mout where the turbo sucks is arround 7cm over the 6cm of my original, the out let it's bigger too, the impeller, the diameter of the base is arround 6" too I think, I will take pics when is done and paste it here.

I,m not sure what type of T04 is if is the B or E series, what are the differences between them TCD?

I'm not changing nothing in the back.

DK; tahnks for the info, my turbo is not Ford and I read before the Bimmejim pages anyway.

Thanks

[bimmerphile]

Hello lag.

[TCD]

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

[bimmerphile]

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

Really? that's good to know. I would have though that when he swaps out the T3 for the T4 his lag would increase significantly.

[diegom6]

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

Todd, what you mean exactly with ".48 rear will choke that engine big time"? you mean it's too small for the 2.5L and also for the T04 front compressor? what can cause if I still use this .48 in the rear?

Finally here are the pics, the compressor is T04"B" .60 A/R, the wheel specs don't know.



Here a shot comparing the old T3 .42 vs my new fresh T04 .60





The exterior diameter of the mouth in my T04B messures 7cm vs 6cm of my old T3 compressor.



Todd, again, what are the differences between the B and E series compressor?

Thanks

Diego :D

[decay]

Todd, what you mean exactly with ".48 rear will choke that engine big time"? you mean it's too small for the 2.5L and also for the T04 front compressor?

he probably means the same thing i meant when i said:
"i really think you're gonna want a .60 AR hot side to go with that t4 compressor... .48 is too small even for a big four-cylinder, let alone a small six."

reading comprehension good.

[TCD]

.48 is too small for any scenario given you have a 2.5L But you want to runn higher boost and installed a compressor that will flow more air at a given psi, so you have compounded the problem. You can only squeeze so much volume through that tiny exhaust housing.
Todd

[diegom6]

.48 is too small for any scenario given you have a 2.5L But you want to runn higher boost and installed a compressor that will flow more air at a given psi, so you have compounded the problem. You can only squeeze so much volume through that tiny exhaust housing.
Todd

Ok, what do you think about this compressor? it's the B, it's a good one or maybe is better the "E" series? :roll:

[TCD]

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