.48 .55 .63 so many choices!

[stomp]

I have been leaning towards the bullseye 50 trim.55A/R for awhile until a new thread opened up in the newbie section,keep in mind that this car is going to be just a street car daily driver,which is making me lean towards getting the .48 hot side because I'm not going to be redlining it.I have been searching about back pressure but could not find any informative numbers saying that this small of a a/r is actually bad for the turbo or car sure there are people saying it but no solid evidence.Basically what I want is a fast hard hitting 50 trim that if my wife was nagging at me in the passenger seat I could give her whiplash with a push of the throttle..J/K

 

[GVR4592]

You can't compare the different A/R's from turbine housings that aren't in the same "family" of turbine housings. Like comparing a Garrett T3 to a Bullseye, it doesn't work that way.

 

[stomp]

Then I guess the title should be changed to ..Who has driven a pte 50 trim with a .48 and a bullseye 50 trim with a.55 and liked it better for the street

 

[crazy_skier]

I have the garrett with a .48, and it kicks like a 10 gauge shotgun

oh and you will have a dump tube that screams VERY loud!

 

[turboglenn]

The A/R of the housing is one thing, what trim would the turbine wheel be? A .48 AR hot side on a 50trim would be great for fast spool, hard hitting response but lacking on top en shear HP #'s because of the restriction in the exhaust with the .48 hot side. If it's a stage III wheel it will be better, but lose spool, a stage II would be great, a stage I would be so restrictive with a .48 AR that it would spool by 2800 RPM but choke out on the top so bad it would feel like your turbo stopped spinning or something


I've been deciding on the same thing roughly..i've got a 57 trim compressor and trying to figure out the best sacrifice of power and heat back up, in trade for better torque and faster spool... So far I'm thinking stage III turbine with a .48 AR hot housing or stage I turbine with a .62 AR hot side..but i won't know until i try one

In some ways i hope that having the wastegate dump to the atmosphere bypassing the rest of the exhaust will help with restrictiveness under WOT, but I'm not sure how much that accounts for in the way of making up for the restriction of such a small turbine wheel or housing.

 

[crazy_skier]

I believe that I had a stage 3 wheel.... and I was putting out 330 awhp with the .48 a/r on both my 2.0 and 2.4... the 2.4 just started losing power around 6400

 

[stomp]

Wow only 330 huh,I guess it really is a sacrifice seeing that most 50 trims put down around 380 +,I'm going to really have to think about this one.The quick power sounds awesome though

 

[turbo addict]

I had/have a t3/to4e turbonetics bb 60 trim with a 48ar 5bolt outlet and a stage 3 turbine wheel; and would get full boost (20+) between 3000rpm and 3200rpm. But I also had creep problems and couldn't run less that 17 or 19 psi (both rpm and boost were dependent on the weather. hot or cold). I would not go any smaller than a stage 3 wheel! If I could do it over I would get a stage5. Then you can jut change the housing. But I would look at a stage 3 with a 63 ar, unless you really want spool and topend is not a priority. But then you would more than likely be better off with a smaller turbo.
Just my opinion.

 

[crazy_skier]

two things I forgot to mention for when I hit the 330. I was only running 16 psi and pump gas, and I only had an safc at the time..... I never had it dyno'd with link or race fuel but I'm sure I could have gotten alot higher numbers

 

[stomp]

Oooh,that explains alot thanks for clearing that up crazy

 

[DGajre777]

Read until your brain explodes...

http://www.dsmtuners.com/forums/turbo-system-tech/199534-turbo-education-thread.html

 

[stomp]

I have..It's just so hard to decide with out actually having 3 different turbos to play around with.I sometimes hate having the only eclipse in town,I wish I lived closer so I could take some test drives in other peoples cars

 

[crazy_skier]

I would get a 50 that I can get 2 housings for then... like one street/fun aka .48 and then a .63 for track/power. And if the .48 was a little restrictive for your liking, you could port it out a little to help it better. I really wish I had cranked it to max boost and tuned it for that. Once in my 2.0 the w/g line melted and I spiked up over through a second gear pull when it was -10F.... wasnt paying attention and was like wow this is fast so I looked and saw the gauge pegged at the 30... but wow the back end tarted to break loose and it was holding all the way to 7000... i didnt look until high 6000's so anyways my story with that was I'm sure it could have pulled the high numbers you want but a lot lower in the powerband than the .63

 

[definitiveno]

at .63 for track power.

 

[DGajre777]

I have..It's just so hard to decide with out actually having 3 different turbos to play around with.I sometimes hate having the only eclipse in town,I wish I lived closer so I could take some test drives in other peoples cars

Well, what's your budget? If you don't have one, look at FP's 3150 which is their dual BB version of the 50 trim with a FP turbine housing aka hotside. You'll need a V band external gate and their o2 housing.

As said before, you can't compare the A/R of one type of turbo to another. You can't compare the Bullseye hotside to a FP or a PTE, or a FP to a PTE or a PTE to a bullseye.

Do you plan on getting a SMIM and atleast some 272/FP2 type cames? If yes, just go directly to the 0.63 or the FP 3150 (if it is in your budget). If you get a PTE type 50 trim turbo with a 0.48 a/r turbine housing and it seems to run out of steam at lets say 6000RPMs, all you'll need to get is swap out the 0.48 hotside and replace it with a 0.63 hotside.