i run a bw s480 with a 1.32 a/r and it feels a little laggy. it is great for drag racing and 3rd, 4th gear pulls but other than that it feels laggy.

what do you guys think about a 76mm with 1.06 a/r?

how much of a difference will i notice from journal bearing to ball bearing?

i would like to know about your set up and what you guys think

 

couldn't you just get a smaller turbine housing for the turbo you have now and save some money?

 

i was thinking about that too.. i can go with a .96 a/r but is like 399 for it

 

you dont want to go to small though. it will hurt your overall power in the end. Your only in the lower (lag area) boost for a few short seconds of 1st. after that, everygear is spent up top full boosting.

 

i know how to drive

i wonder what would it feel like if it had a .96 a/r

 

You can always drive mine to test out when I go back to Kilo. Should be next week I think.

Mine is a T78 ball-bearing with a smallish a/r but can't remember exactly what it is. Will look it up. Have been told it's on the smaller end for a 20B but I am pretty pleased.

Of course, you'll have to cough up your air temp mod for me you bastard!

 

LOL dave! you have to remove the upper intake and run a line from the back plate to the water pump, let me know when you take the car to jesus and i will stop by so i can show you exactly what to do.. im sure he can do it.

i need a turbo that is going to be efficient and will get me to the 750-800whp.

 

The S480 is definitely a laggy turbo, cant believe you are driving it on the street. Are you going to stick with a T6 flange turbo, or would you make the switch to T4? I can make quite a few suggestions but Im trying to narrow it down for ya.

 

i really dont know what to do..

i can switch to t4 i guess.. i just want something that will spool a little sooner and get me to the 750-800whp.

 

Well, from Garrett I would say GT4508 or GT4708, a Precision 76-78mm, or BW S375. The Garrett and BW are available with T6 flanges, the Precisions are only T4. You just need to figure out budget and brand preference, and journal vs DBB.

Spool with a DBB on a larger turbo is noticeable.

 

Cheap solution

Link:
https://www.rx7club.com/3rd-generation-rx-7-1993-2002-parts-99/new-garrett-gt45-t6-1-05-ar-turbine-housing-853084/

 

Apparently you dont know turbos all that well. The S480 uses a completely different turbine, a 96mm wheel, the GT45 is an 87mm. If the turbine housing was machined to fit(big pain in the butt) it would be a much smaller a/r ratio than what it currently is on the GT45.

 

Didnt know you were the resident Turbo Genius.. I am aware of the size difference... Yet I know that my housing can be machined to fit a larger exhaust wheel. Pain in the butt to machine the housing... why?

So you are saying that having the 1.05 A/R T6 housing I have machined larger to accept an exhaust wheel from the S480 would actual change the A/R value?

If this is true, its news to me.. yet i learn new things daily...

 

Its basic turbo knowledge, not trying to be rude. Yes, the housing can be machined to accommodate the 96mm turbine, but thats quite a bit of work for a one-off project. To get the contour perfect for the wheel would be time consuming, and cost more than a new housing.

If you machined the housing to fit the large wheel you increase the 'radius' in a/r while keeping the same 'area'. That would effectively give you a lower a/r ratio.

If anything, the turbo can be rebuilt with a different turbine wheel and housing, but thats not very cost effective.

 

hey, hey! now..

by the time i machined the housing and blah blah blah i will be at the same cost of brand new smaller housing for my turbo.

money is really not an issue.. i just want the right set up and i call always sell my turbo

 

If thats the case, the GT45R, GT47R would work great. You would only need to modify the downpipe to fit. The S375 will spool quick and be the least expensive, you wont need to modify the downpipe or manifold.

You can even get the GT45R with a Precision 78mm billet compressor, that would be pretty nice.

 

Gte a good used one I just picked one up for $100. Just ask around on the forum.

 

Ok.. it cant change the A/R value by much.. Since you seem to know.. with the machine work, what would the new A/R value be?

 

isnt the bw s480 same as gt47?

 

Go v-mount, and make all your piping 3".
then see if you still need the new turbo.

 

all my piping is 3"...

 

i love my laggy s480.

 

what a/r size do you have tommy?

 

Actually it can change much. No idea what the a/r would be, you need to know the internal volume of the housing inlet to find it out.


Totally different turbos. Similar size but thats about it.

 

then go v-mount. make as short and efficient of a route as possible, and you'll see an increase. It might just be the same increase you were looking for with a smaller turbo. Whether it is or isn't, it will still show a gain that can be improved apon by a smaller turbo even if it weren't enough alone.