jreynish

iTrader: (2)

Alright I know this has been discussed before and almost always ends up being a single is better than a twin discussion because... blah blah blah...
Now my intent is TO DO a custom TWIN TURBO SETUP... not a single my mind is set so if you could please stay on topid and contribute positively it would greatly appreciated.

Ok, I have a 90 Turbo FC the car can handle the twin setup.
Now my goal is to see about 450-500 rwhp... without a 4000rpm lag. (hense my decision for a twin setup)
Now I don't want to spend the time to make them sequencial so they will be run in dirrect competition with each other.
So one rotor will each feed one turbo, and one wastegate plumed to both manifolds is my desing idea.
Now what i want some help with is what turbos to choose.
so far I have concidered a couple of t3 garrett based with a .60 ar hot side and a .55 ar cold side. therewould be two of these but my calculations of compressor maps I have seen show that this setup would support shy of 400hp. so I concidered two td05 MHI turbos but have read that a couple of people have had trouble with this setup about the turbos fighting each other.

So if you have any ideas as to what would be a good pair of turbochargers that will be able to support my goal hp mark.
Thanks
Jeff

pluto

You mean something like this??

http://www.gothamracing.com/pics/Sho...urbo%20kit.JPG


Those are pretty small turbos and still gets alot of lag. Too much inertia to overcome before you get any spool. We didn't get full boost until after 6000rpm. I don't think its worth the money and time but that's up to you.

Wargasm

What about two T3 60 trims?

jreynish

iTrader: (2)

pluto those are still pretty big in size compared to the ones I have been suggesting.. what size are they?

wargasm the t3 60 trims uses the same compressor so the eficiency is the same so not much of a differece I would have to go to a much larger size to get the difference i need but then it would be overkill.

RETed

You got the money?
I've always wanted to try twin GT2835's.
This should give you fast spool-up and a power potential approaching 600hp.


-Ted

teamafx

iTrader: (4)

custom twins are fun..............almost ready with mine

RICE RACING

I am using twin GT35R's on my 13B with 0.63 ar rear housings, let you know how it goes very soon hopefully.

MrRx

iTrader: (1)

Wow there are more of us going "Twin" than i thought,

twin TB25, here, shooting for 350ish hp

RETed

Holy crap!
Almost 900hp of turbos???

We've got a twin GT2530 sitting over here, but that project is not going anywhere anytime soon.


-Ted

RXciting

Also workin on a Twin FC setup.. looking for quicker spool up more then high HP
Going with GT20's .60 hot and .52 cold

Frank

pluto

I think twin setup is great for drag racing but you can't beat a single for performance and lag. No matter how you look at it, you have to overcome the inertia of two turbo assembly over a single assembly. I think GT25 should be pretty good but it'll still be laggy. As small as the stock twins were, they were pretty laggy for non-sequential operations.

jreynish

iTrader: (2)

wow, i didn't know that there were soo many people wanting to do twin setups... wow...
anyways the gt25's are some expensive... lol
But I will see what I can get on a piar...
.60 hot and .60 cold should be way more than enough... that should support about 600hp... but I want something a little less... so that there is a good response for boost... I hate the lag.. hence why I don't want a large singe.
any ideas as tot he perfect sizing of the turbos?

1bad7

dude pull ur head out of your ***. a twin turbo setup on a 1.3l rotary will be extremely laggy

jreynish

iTrader: (2)

I am glad you follow the outline of the thread... please don't post again, I am willing to have some lag (comes with more boosted power) but I don't want the lag of a similar power output of a single. Pretty simple, I want a ballance between the power output and little lag...

Now pull your head out of your *** and read up on physics, one mass rotating requires x amount of force to rotate it at y rpm now you devide the rotating mass by 2 you need x/4 amount of force to rotate cette mass at y rpm. Now these two equally sized rotating masses produving z boost/flow will reach y rpm at 2/3 the time of the larger (X2) single rotating mass.

Now what this means is that a twin setup that flows as much cfm's at the same psi to produce the same power as a large singel will spool 2/3's faster!

widebody2

1/3 faster....2/3 the time of the single

teamafx

iTrader: (4)

seriously, if a twin setup is done properly it can outperform a single on any day, its ignorant to think that a single is better because its commonplace

jreynish

iTrader: (2)

Yes sorry i mistyped...
Thanks for catching that.
Anybody else with some suggestions on turbo's and sizing?
Jeff

RICE RACING

In my case (and I can only give input to my situation) I am going for an output very high on the scale of things. A single turbo *of suitable size* would become redundant on anything but a drag application, and I want to circuit race my toy along with a host of other activities.

Going to smaller twins (far far less rotational inertia) and also much more turbine flow capacity (without going to a GT60 single) means I can have my cake and eat it too

I would have to say this senario would be the same regardless of HP level, 500rwhp, 700rwhp, or 900+rwhp. Sure its not cheap but the technical merits cant be disputed its just a matter of finding a combination that works to match your HP goals.

I know if you search you will find intput from a few different users over the years that talk about very fast responce twin turbo set ups that suit the 400rwhp range and have very low back pressure figures as well......... try the search function ?

jreynish

iTrader: (2)

Thank you for your input, but I have searched time and time again... and have found nothing concrete as to what I am looking for... if you have any that you have found by all means please post them... as I am at a loss.
Thanks

MrRx

iTrader: (1)

Im wondering if he/she relizes the car comes Twin..lol


That is total BS yes there will be lag but not as much as a big single,

A TB25 is only a slight bit bigger than the stock turbos, +they spin easyer, and flow higher..


So next time you have something you think might be intelligent to say, Dont

MrRx

iTrader: (1)

I thought i might add

My twin project was actually very cheap in comparision
In total the parts and turbos to make the kit were just under $1200
This includes
2 X TB25
6ft of 321SS tube, and other misc exhast parts
oil lines
water lines
airintake stuff

It was the porting, ecu, blah, blah, blah that adds up

1bad7

wow ladies, ive been around a lil longer than all of you, ive seen this done and i know whatll happen. if this plan ever does come to life for any of you please post your thoughts then

Marcel Burkett

Jreynish , check your pm's.

jreynish

iTrader: (2)

Well "Old man"(concidering you are only one year older than me???) since you have been arround the block you should have known that the physics involved invalidates the statement you made earlier, but that is ok. I respect your opinion, even though you added nothing to my thread only exactly what I didn't want... as single is beter... blah blah blah...
But again when I do finish the project and get it all finished up you can be sure I will post the results here.
But for now I would like to continue brainstorming with the people that would like to add, and whos additions and comments I respect.


Thank You, I replied


If anybody else has any other ideas or questions shoot them out, it would be nice to hear some opinions of people that have concidered it but never did it due to cost... let me know what you had in mind... or anybody with questions or comments (that add to the topic of this thread) just post them.

SPOautos

With you being born in 1983 and only being 21 I can promise you havent been around more than a lot of the people in this thread. Personally, I think that either you really havent seen it done or you saw it done by someone that didnt know what they were doing and didnt know how to size turbos correctly. Since you must have first hand experience with this go a head and tell us what setup you saw that wasnt working. What exh manifold design? What wg design? What turbos including exhaust a/r? ect ect ect. How was it set up?

Stephen