.48 a/r or .63 a/r

[imola20ae]

Alright, some of you may know, but I picked up a nice T3/T4 turbo, its a 50 trim with a .48 a/r. Some of you have told me to go with a .63 a/r, and some of you have told me that the .48 a/r is all right. But what I want to know is the pros vs. cons of these two, and what whp/wtq possibilities I have, and what I'll be able to do with both. Feel free to go comment crazy!:smile:

[POSgti]

In my personal opinion which you didnt ask for, the .63 A/r turbine is waaayyy to big, it doesnt get full boost till like 5k or 5.5K rpms and your just sitting there forever waiting to get into boost. I think that the .48 is perfect, you get fast boost and a really nice powerband...... If you like a nice streetable turbo car and you like to pass people without downshifting, you go with the .48 a/r and if your looking for good quarter mile times and high hp numbers go with the .63 a/r... I have built and driven both. I also think that too many people over-turbo their cars but it really is a matter of personal preference.

[meatwad!!]

more or less, thats what i told him

you should see close to 300 if not 300hp with that and the rest of the bolt ons.

[imola20ae]

I would like to end up with mid 300whp

[boostin20v]

You'll have more mid range with the .48 as it'll spool quicker, and would be my suggestion. Vin's got my old .48 T3/T4e and put down an unrefined
320ish whp.

[BUNNYLOVE]

Alot of it is preference. For mid 300s it won't really make a difference in you making your goal. I'm on the other side of fence. If you have the .48 already give it a try.

A .63 will give you better topend power but slower spool up. A .63 stage 1 is not a really big exhaust side and won't be that laggy. I ran a .63 with a stage III wheel and a larger compressor than this one on a 1.8 8V and still had a good 3k on up power band. I would rather have later spool for traction purposes and top end pull. I did build the car to go fast and run the 1/4 mile but I would still choose the .63.

[evolveVW]

You'll have more mid range with the .48 as it'll spool quicker, and would be my suggestion. Vin's got my old .48 T3/T4e and put down an unrefined
320ish whp.


it is actually a .60 a/r 50 trim with a stage 5 wheel. It starts to hit pretty hard at about 3200 and keeps going all the way to redline.

[boostin20v]

exhaust side Vin, not cold side.

[BUNNYLOVE]

I think you have a mix of specs there. Stage 5 indicates a exhaust trim but the 50 trim and 60 A/R are TO4E compressor/wheel sizes.

[GLiMKIV]

I use a .63 a/r. I like it on the highway. If you plan on mid 300whp than you will need to do rods, especially with a .48 a/r only because of torque spike. .63 a/r will give you a little less stress on the rods.

The .63 a/r will give you full boost by 4200-4600 depending on what gear you are in. The perfect way to test is doing a 4th gear pull at 40mph.