Twins for what

[TeaBagger2006]

Since there is so much turbo talk going on (confusing too) I have a questionz.
What the necks the point of spending the big bucks on compounds to run 10's? If they can be ran with a 75 mm charger(ie. Gt4202) alone ? Usually if that's what your shooting for with twins , the 75 becomes the small charger and you have to add an even bigger turbo just to run what the 75 could run alone. Or is the point of compounding just to reduce spool up?

 

[KEVINL]

who is running 10's with a 75mm charger?

 

[x MadMAX DIESEL]

twins won't ever make the power a single can, just make it easier to drive. I used to want twins

 

[x MadMAX DIESEL]

who is running 10's with a 75mm charger?

2.6 race in Fl.

 

[blackdirtymax]

twins won't ever make the power a single can, just make it easier to drive. I used to want twins

You sure about that?? Lol

 

[x MadMAX DIESEL]

How can it? It will get choked down

 

[TeaBagger2006]

who is running 10's with a 75mm charger?

IIRC that's what Casper ran 10's with

 

[blackdirtymax]

How can it? It will get choked down

So your saying a built motor with a gt4202 will be just as fast as built motor with a gt4202 feeding a gt 55 ??

 

[ChevyDieselLLY]

Oh I like this thread.

 

[hondarider552]

So your saying a built motor with a gt4202 will be just as fast as built motor with a gt4202 feeding a gt 55 ??

Apparently..

I didnt buy twins because I dont see a need to compound to the stock charger, so I went with just a HTT.

 

[blackdirtymax]

Apparently..

I didnt buy twins because I dont see a need to compound to the stock charger, so I went with just a HTT.

Yeah that makes better sense

 

[ku 808]

How come the fastest diesel on the planet run twins?and the most power till date dyno Duramax was with twins:hello:

 

[SSchmi5519]

So your saying a built motor with a gt4202 will be just as fast as built motor with a gt4202 feeding a gt 55 ??

Other way around hoss. He's saying that theres no way that an S475/S366 (or the like) twin setup, could never flow more air than that same S475 as a single.
Reason being, the 475's flow path is bottlenecked by the S366.

 

[turbhoe]

I thought alot of people do it so they can have big power but, still be able to tow without needing alot of rpm to do so. That was my goal anyway.

 

[ecc_33]

Other way around hoss. He's saying that theres no way that an S475/S366 (or the like) twin setup, could never flow more air than that same S475 as a single.
Reason being, the 475's flow path is bottlenecked by the S366.

Exactly, thats why you don't see anyone in the unlimited single class 3.2 twins running twins, the big singles flow more than the same combo with a small charger to disturb flow. Stingpuller,camomax,casper have all ran into the 10's with a single turbo. Many ways to skin a cat comes into mind on this subject:thumb:

 

[Drholliday]

How come the fastest diesel on the planet run twins?and the most power till date dyno Duramax was with twins:hello:

Thats simply b/c they are running a small turbo that is bigger then most would run as a single turbo simply b/c if they didn't have that turbo the truck would never be able to spool the large 110mm or larger turbo as a single.

But.... hypothetically speaking... if you have a single S510 and could spool it. it would make more power then the same charger as the big one in a twin set up.

 

[blackdirtymax]

Names Trey , not Hoss lol , I get what y'all are saying but , some of the fastest numbers a dmax has put down have been with twins right ?

 

[McRat]

who is running 10's with a 75mm charger?

Edit: Earlier = http://www.duramaxdiesels.com/forum/showthread.php?t=1120&highlight=Casper+Famoso

http://www.duramaxdiesels.com/forum/showthread.php?t=9013&highlight=casper+stock+injectors

10's with stock injectors, GT4202, no nitrous, 6420lb.

It had run 11.00 at high altitude even (LACR) with that setup.

 

[McRat]

The reasons for twins:

More efficient exhaust gas energy recovery, however this is offset by higher compressor losses.

Higher peak boost levels, however this is offset by mechanical limits of high cylinder pressure, and lower peak HP RPM.

There are almost always trade-offs when doing modifications; there is seldom a free lunch.

 

[xcablb7]

I don't think I could make over 800 with my 4088 alone, nor would it be any fun to drive with just th 4718, I put twins on to make a best of both worlds kinda comprimise low egts, great drivability can tow whatever and still have between 8 and 900 rwhp