Obviously they are larger, but i was looking at the tial turbos and they look very nice. What have you guys seen as far as spool difference and power between a 4088 and 4094 and a 4294? I have researched the turbos but want real world experience. Thanks

Jarod

 

I have found the 40r turbine to be laggy in almost all of the applicatons i have used it in. The 42r turbine when setup correctly spools very good.

What is your application, along with power goals?

 

Spool is going to be very similar between the two if you are using a divided manifold. The 4094r is a poor mismatch IMO between compressor and turbine. I have tuned 5-6 different cars using the 4094r, and was not impressed. The compressor is rated to flow 78-80 lb/min, but i have not gotten that much power out of one even with the 1.06 and 1.19 a/r turbine housings. I think i have seen 30-40whp more out of them compared to the 4088rs. They are just back pressure limited. Garrett would have been smarter to pair the 4094r compressor with the 42r turbine wheel.

 

Well my application is a Mazda KL v6 so you guys wont be able to help me much there. However it will help me in picking a turbo. I just dont know exactly what to get between a few. What are you seeing as far as spool time between a 4294 and a 4088? My power goals are set to be somewhere around 6-700hp. So unfortunately i dont have the option of a divided manifold being that it is a v6. I guess i do its just not practical.

 

I have used the 40's on 6 cyl applications but in twin form only.

 

just curious, how much power were you able to make and at what psi?

 

750whp around 33-34 psi with the 4094r. I usually make low 700whp with the 4088r around the same boost.

 

Well the thing is, is that its only a 2.5L 6 cylinder so it doesnt displace a whole lot. Thats why i am worried about it. What kind of spool difference are you seeing between a 40 and a 42?

 

They spool with 200-300 rpms of each other if you are using a divided manifold.

 

I cant use a divided manifold its a v6. I am assuming when you say divided you mean twin scroll? If i were to attempt twin scroll it would be the craziest network of piping i have ever seen. So, with that said what would you wager if its not divided?

 

In my opinion I would go with Tial housing 42R for your application.

 

twin scroll on a v6 is not to hard. run one side of the engine to one side of the turbo then the same to the other side. i seen many v6s and v8s like that

 

Thats how its pretty much set up. both pipes merge right under the turbo, but to do a true twin scroll design is extremely difficult. Thats why i am saying twin scroll wont really work.

 

Is it possible to DD a gt4088R in a B series?

 

Sure, why not. When you realize how impractical it is and turn it back down to 350whp so its streetable, you'll realize you spent way too much money on something you can brag about. You'll then go down to a turbo that's actually fun to have on the street. IMO

gt4088 is a drag turbo, or for show cars.