Twin turbo? [Merged 11-6]

[XTurboSpYderX]

Originally posted by Tom Sawyer


You realize this would put him at 32psi on stock internals? He is talking about 6psi total.

Tom

you only compound pressure if you run turbos in sieries... (one feeding another) like the old tractor pull rigs used to do... if you run one turbo off each side of a "V" or a horizontally opposed (like the porshe 911 Twin) you MUST be very carefull and have SOLID boost control, or you risk overspeeding one of the turbos, or worse, having one side overpressure the other and "backspin" the weeker turbo... but that is where a good BOV comes into play, and making sure that the intake pipes are joined close to the throttle body/carb (depending on your setup)

 

[Tom Sawyer]

Ok. I haven't done a whole lot of research on the topic, just trying to help you guys help him. I think I'll stay single turbo for a while yet .

Tom

 

[XTurboSpYderX]

Originally posted by Tom Sawyer
Ok. I haven't done a whole lot of research on the topic, just trying to help you guys help him. I think I'll stay single turbo for a while yet .

Tom

it's cool bro... we wern't trying to bag on you... we were just trying to give correct information...

"There is nothing wrong with ignorance, as it is simply lack of knowledge... it is unwillingness to learn that should be painfull"

 

[Bohrn]

I agree on the single turbo idea as well. He is only after 6 psi, and the single t-25 will do that no problem. As well, he can keep his stock exhaust manifolds, and only have to make a y-pipe that will mate to the turbo. Also, at 6psi, he does not need an intercooler, thus making your system more efficient and cheaper.

I don't think you will benefit from the twin turbo setup, unless you just have to have a twin turbo setup to impress your freinds.

Single turbo, all you need it 1 turbo, one y-pipe and one pipe between the turbo and the air intake, and a basic boost control system.

twin turbo, you will need 2 turbos, 2 custom made exhaust manifolds, custom y-pipe(or custom dual exhaust), much more complicated intake piping, and much more sophisticated boost control.

just my 2 cents

 

[xjarayax]

I'm going to go with the two turbos...I already have them here.

A single T25 will spool up VERY fast on my engine and run out of steam way before my redline.

I *shouldnt* need new manifolds because of twins, I will be mounting them the same place where the LS1's mount their twin t3/t4 hybrids, just hack off the Y pipe, mount them there (there is a lot of room down there) and either run true duals or just dump it right after that.

As far as intake routing, I'm not all that certain what I'm going to do, I know I can pull it off since the LS1 Incon TT kit uses a FMIC stuck infront of the radiator, if they can fit it with a V8, larger intercooler, and two bigger turbos, I definately can on my V6, smaller intercooler, and two smaller turbos- just going to be a pain in the ass.

The reason I am going with twins- is yes, the badass factor , but I also want instantaneous spool time and want the turbos to giving off power all the way to my redline- I know the boost I would be capable of running- but won't be, right away, is a lot of overkill. But it definately leaves room for LOTS of improvement...and if you can't improve....why bother?

I hope that made sense, did in my head Thanks for being cool, guys, keep it coming if you got more

Sam

 

[out there]

just doing a little theorizing recently... would it be possible to alter the 1g 4g63 to a twin sequential turbo? spool up would be much faster, right? assuming of course that it's a smaller turbo then a larger turbo... any input on this? what kind of supporting mods would be necessary (if it is possible)? any non-standard problems that should be expected? thanks in advance

 

[wishihadatalon]

i have seen it. but have you ever noticed that alot of the supra guys go to a single turbo. its on here somewhere. i think a single turbo is best for our cars b/c displacement is so small and you would have a slower spool up time.

 

[out there]

wouldn't the first turbo start to spool up before the second? so if there were a smaller turbo (ie t25) before a big16 or larger, shouldn't that get the big16 to spool faster? i'd think that just a few lbs from the t25 would start the big16 to spool up nicely...

 

[RaysTsi]

Hey sweet deal I just got one question why stock T25 turbos. Is it cause you can get them cheap? But that is gonna be sweet as hell :thumbsup:

 

[TSi92]

If I'm not mistaken doug derby had a twin turbo laser. Go drop him an email or something.

 

[Johnny Bravo]

A sequential turbo system isn't nearly that simple though otherwise I'm sure many more cars out there would've had them. The 3rd gen RX-7's is a prime example. Under the upper intake manifold alone there are 6 solenoids & 76! vacuum hoses. Believe me it's a nightmare as I replaced all of them on my old car myself with the help of a buddy. Not fun. Twin turbo setups are complicated & rarely worth the effort other than from a factory standpoint. Just get a nice single ported bb turbo & open exhaust & you'll get more than enough hp & quick enough spool.

 

[1g dsm]

oh god stop #@%#@%#@%#@%ing watching f&f.

 

[rubbersidedown]

Originally posted by 1g dsm
oh god stop #@%#@%#@%#@%ing watching f&f.

what are you talking about? i'm sorry, but that was just waaay the hell outta line. what in the world does a twin turbo system have to do w/ f&f anyway?

 

[1gTURD]

the guy talkin about the tt setup on teh rx7 (3rd gen) is absolutely right.

a buddy of mine has a 93 with alot of work done to it... hes runnin singke turbo now with the haltech system so almost all of his vacuum lines are gone... but before when we had it at the track runnin 18 psi (8 more than stock) it had the stock sequential turbos in there with the "door blocked off" going from the primary turbo... so its basically non sequential... but even before that... we would run 18 psi and blow vacuum lines off like it was our job... sitting in teh pits looking at 546 boost solenoids for a sequential setup is not fun

 

[wishihadatalon]

if you want quicker spool up just get a stroker motor.

 

[out there]

i think i can see what you mean about the twin turbo being a big pain to work with/install... thanks for the input. i'll ask about the whole stroker thing next winter when i'm planning that summer's mods

 

[out there]

Originally posted by 1g dsm
oh god stop #@%#@%#@%#@%ing watching f&f.

i do think it's a neat movie (mostly because the soundtrack kicks!), but my considering a twin turbo 4g63 is because i'm obsessed with having better/cooler things than most other people...
victim: whoa... does that have a v6 or a v8?
me: nothing that fancy... just a twin turbo 4cyl...

 

[Bohrn]

my guess would be cheap as hell, reliable, and really quick spoolup times! Later on he can upgrade them to newer ball bearing t-25s, and it would be even faster.

As he needs only 6-8 psi, the t-25 might actually be a bit big hehe,never thought we would say that about a t-2-small hehe.

 

[xjarayax]

6-8 psi would be my baseline, I'd definately do 9-10 at the track.

After getting GTP pistons and better tuning/fuel management would definately go for 12-13--Always want room for improvement.

Sam

 

[sacestar836]

beast

 

[Bohrn]

if you are gonna go that nuts with internal engine work, and seeing as you already have an auto tranny, why not go for a Grand National engine?? Both 3.8 Buick V6, and there is a WHOLE lot of performance parts and knowledge pertaining to Buick 3.8L engines

 

[xjarayax]

It's been done once- and it was a really expensive project.

The GN is the 3800 Series 1

Mine is the 3800 Series 2...despite the names, there is a lot of difference and I read it was a huge PITA to fabricate.

Sam

 

[Bohrn]

Oh , I know that the GN is series 1, I work at a GM dealership. I just figured it would be easier to put one of those engines in than it is to make a custom twin turbo setup.

How about a 4.3 turbo setup from a Typhoon or Syclone?

 

[xjarayax]

Too much cash all at once- if I were to do an engine swap....I'd just trade in the car for an LS1...the cost just is too much to make it worth it.

Looking for a link to the GN swapped Firebird..

http://www.gmhightechperformance.com/features/0109gmhtp_byebye/

It's good reading

Sam

 

[97turbodsm]

I would definitely only go with one turbo if you are only wanting to run 6 psi. Your redline isn't that high (ours is higher) and the T25 could hold 6 psi forever.