twin turbo... why

[T-Punk]

ok though i have found that it would be a waste of money and offer little gains over a single but i decided to start a thread which can be referred back to as to what all is required to create a twin turbo setup. i am going to put in what i know you would need and if i miss anything please ring in. One Twice the cash. Two at least one scavenge pump. probably 2 small intercoolers, of all the neccesities (bov's wastegates, etc). more piping and finding more room. possibly cutting out accessories ie your AC. probably more but cant think of it now.

[dashiftyfella]

if your lookin to save money maybe some internal wastegated turbos, then mount the turbos high enough where you dont need scavanging pumps. if you make your own headers thatll help some too. i think twin t3s would bee cool on our motor. lemme kno how this works for you cause i want to do the same thing. im using t3s from saab 900s.

[Teufel Hunden]

T-Punk, not everything you said is accurate about twin turbos. If you do it correctly, you don't need a scavenge pump, you don't need to delete any accessories, you only need one BOV. Also, you can run one intercooler too. It's wrong to say that twins are "a waste of money" or won't give you many more "gains." First of all, what are you meaning when you say gains? Are you talking about peak power? or are you talking about power under the curve? When designing your turbo system, what are your goals? Do you not care what your dyno graph looks like? There are too many factors to just label ANY turbo system, be it single or twin, as a waste of money.

[slow]

Originally posted by Teufel Hunden:
T-Punk, not everything you said is accurate about twin turbos. If you do it correctly, you don't need a scavenge pump, you don't need to delete any accessories, you only need one BOV. Also, you can run one intercooler too. It's wrong to say that twins are "a waste of money" or won't give you many more "gains." First of all, what are you meaning when you say gains? Are you talking about peak power? or are you talking about power under the curve? When designing your turbo system, what are your goals? Do you not care what your dyno graph looks like? There are too many factors to just label ANY turbo system, be it single or twin, as a waste of money.

alright, where can you put 2 turbo's, high enough so no scavenge pump is needed, without moving/deleting accessories?

Thanks. [img]smile.gif[/img]


Original thread, you can use used parts, and do it cheaper, 2 T25 or 14B turbo's from eclipses, woudl work fine, they were good enough to put a mustang into the 11's. You do not need 2 intercoolers, mounting incon style you do not need to delete any of your accessories. You can use internal wastegate turbo's, which i woudl reccomend for the incon style setup, as there is not much room there, you don't need a fancy BOV, going blowthrough you can use simple bosch bypass valves open to atmosphere.

Ryan

[T-Punk]

i know that there are gains with a twin setup and if someone ever tries to do i maybe we would find out what they all are, but still it is much more money to get one all fabbed up. my reasoning as to using two intercoolers is i dont see room to pipe them to one dual inlet I/C and to fit two in our engine compartment i am pretty sure they would have to be mounted lower. i only put this post up to give some info on why noone has done this type of setup on this board yet, not to say it cant be done or that a twin setup might not be better. its just noone has the time or money to tackle such a project and i dont see the NEED for a twin setup... now if someone wanted to really go crazy and try a sequential system then i would have to say hell yeah.

[Tiago]

there are no gains from a proper sized single to proper sized twins, should be exactly the same output. Just configuration flexibitly/price.

[Teufel Hunden]

Originally posted by slow:

alright, where can you put 2 turbo's, high enough so no scavenge pump is needed, without moving/deleting accessories?

Thanks. [img]smile.gif[/img]

[/QUOTE]

Using the stock manifolds, you can make a flange and mount them right there. you don't have much room to play with, but it can be done. :D

[slow]

good luck, that is about where the incon kits were mounted, and they needed a scavenge pump.

http://harlan-engineering.com/eviltw...new_motor3.jpg

Ryan

[Teufel Hunden]

i don't think it's quite accurate to compare an LS1 kit to a V6 kit, but it can be done with no scavenge pump.

[slow]

your right, its not the same, but the blocks are similar sized, and same chassis, so you get the same obstructions with brake boosters, steering linkage, ect...

Since nobody to my knowledge has done it on a 3.8, and i don't have any pics to prove otherwise, it was as close as i cound find to demonstrate the location.

you might be able to do it, and i wish you good luck [img]smile.gif[/img] it will just be very close and may have drainage problems. But if not, it would be a ideal setup [img]smile.gif[/img]

I know on my car, i can't get a turbo high enough to not run the scavenge pump, but i have a ls1, so im not sure how much different it is, i know the 95 3.8 that i have looked at, was similar obstructions as my car.

Ryan

[xjarayax]

I pondered the location thing long and hard...


and then went for single.

[Tiago]

you WILL have drainage problems trying to replicate a LS1 twin kit. There is no way to fit a turbo up high enough. Scavage pump would be required.

[slow]

thanks Tiago,

the passenger side is even worse location, than the drivers. but that was the only pic i know of hosted on the net.

http://www.cofba.org/users/reckless/incon1.jpg for pass side. and off car shots of the incon kit

Ryan

[Jerriko]

Originally posted by Tiago:
there are no gains from a proper sized single to proper sized twins, should be exactly the same output. Just configuration flexibitly/price.

I am sure your right there but wouldn't the turbo lag be different between a single and dual setup?

[slow]

not much difference in lag.

The twins might spool up a slight bit faster, but nothing major. a properely sized street setup turbo will be fine on these cars, for a race car, sure you might have more lag, if you have a large single, but a properely sized turbo for a decent amount of boost, will be very similar to a right sized twin setup.

it is not like the singles on these car are supra sized, where 0-4500 is 200 hp, and 4500 the turbo spools to 500+ hp, lol.

Ryan