Twin Sequential turbo??
Thread Starter
Staging Lane
Joined: Dec 2001
Posts: 82
Likes: 0
From: Haulin Asstro in MN
Twin Sequential turbo?? Well here is the idea since I have a crossover pipe from the left to right bank for my deltagate what if I took off one of my T4's and replaced it with a smaller T3 or a quicker spooling A/R T4 for quicker boost building but then still use a bigger turbo to keep up the advantages of a bigger more efficent and cooler charge air. Have the smaller turbos wastegate open at like 2 psi so it wont try to work real hard at higher boost?
Re: Twin Sequential turbo?? Wont work, I cant put it in technical terms but you will be upsetting the balance between the engine for the cylinders to its turbo.
Sequential is more complicated than it sounds and not worth it, esp with a V8.
We supra owners usually dont use the sequential setup and just run true twin mode with our stock twins. Some dont and prefer the sequential.
Man I miss that car.....
Casey
<small>[ November 21, 2002, 10:41 PM: Message edited by: turbo ]</small>
Sequential is more complicated than it sounds and not worth it, esp with a V8.
We supra owners usually dont use the sequential setup and just run true twin mode with our stock twins. Some dont and prefer the sequential.
Man I miss that car.....
Casey
<small>[ November 21, 2002, 10:41 PM: Message edited by: turbo ]</small>
Re: Twin Sequential turbo?? I studied the sequential sytem off the supra once cause i had the same question as you did.
It is more complex then i though. THere are two turbos on low RPM range one exhaust valve is closed that goes to one turbo. With this valve closed all the exhaust gasses flow to one turbo.
on upper rpm range the previously closed valve opens and exhaust gasses flow to both turbos.
This would require a sort of exhaust valve whick can be complex, heavy and unreliable.
Know some of the Stealth/3000gt guys are experimating with runing on larger turgo on one bank and a smaller turbo on the other bank.
Well it does run and work, it seems to get boost a little sooner. The question came up about the exhaust flow not beign equal, But i know with my single xover coming from 2 cylinder banks that my exhaust flow is not equal. sure if they are equal it would be more efficant and run better, but it still runs ok if there not.
Youll just have to chose turbo sizes that dont restrict flow when the other turbo is in range. you also have to woory about turbo effiency range and all of that.
It is more complex then i though. THere are two turbos on low RPM range one exhaust valve is closed that goes to one turbo. With this valve closed all the exhaust gasses flow to one turbo.
on upper rpm range the previously closed valve opens and exhaust gasses flow to both turbos.
This would require a sort of exhaust valve whick can be complex, heavy and unreliable.
Know some of the Stealth/3000gt guys are experimating with runing on larger turgo on one bank and a smaller turbo on the other bank.
Well it does run and work, it seems to get boost a little sooner. The question came up about the exhaust flow not beign equal, But i know with my single xover coming from 2 cylinder banks that my exhaust flow is not equal. sure if they are equal it would be more efficant and run better, but it still runs ok if there not.
Youll just have to chose turbo sizes that dont restrict flow when the other turbo is in range. you also have to woory about turbo effiency range and all of that.
