whats the difference between single and compound

[TeaBagger2006]

what i meant is there any advantages of just running one big turbo over a compound setup that also has a large primary?

i know the compunds would spool faster and have lower egt's?

but there has to be more to this because lots of trucks run 1 big charger instead of a compound.

enlighten me

 

[Subman]

Lots of threads on this topic, all depends on what you want to do with your truck. It boils down to a personal choice. For me it is the streetability, quick spooling, great for towing, saves fuel, (my LBZ with the stock turbo alone strugged to make 17mph on the highway). After twinning it could get over 22 with a hot street tune, and 14 towing my travel trailer with the same tune. runs much cooler on the hills. Sounds good and looks good other than that they are about the same I guess.

 

[sweetdiesel]

Only down fall i can see is price and wieght

 

[TeaBagger2006]

i was thinking more performance wise. does the single have any advanteges over compound...ie. is it easier to tune? i know twins help out in lots of departments but surely there must be some advantages to being single.(talking performance wise because i can imagine its a lot easier working with one charger instead of two)

the only thing i can think about high rpm but i might be wrong. would the smaller turbo at some point interfere with the larger turbos performance?

oh and as i mentioned before,big turbos 4202 an gt55 territories.... just trying to learn

 

[TrentNell]

i was thinking more performance wise. does the single have any advanteges over compound...ie. is it easier to tune? i know twins help out in lots of departments but surely there must be some advantages to being single.(talking performance wise because i can imagine its a lot easier working with one charger instead of two)

the only thing i can think about high rpm but i might be wrong. would the smaller turbo at some point interfere with the larger turbos performance?

oh and as i mentioned before,big turbos 4202 an gt55 territories.... just trying to learn

with a single turbo there is only so big you can go( S480 maybe gt45) and either leave a whole lot to be desired to drive or even get spooled up at the line for drag racing , even on a competition truck , you could never spool a gt55 as a single but in a coumpound setup it is possibly . the turbo does loose some airflow in a twin setup suposedly but my s480 twin setup has performed neer on par with every s480 single setup have seen maybe just a touch under but i was able to tow and street drive with a 10 sec truck it was so drivable .


I agree with Simon , only downsides I have seen are weight and cost .

 

[JoshH]

In a compound setup, it can only flow as much air as the big turbo can move. When run in a compound setup, the big turbo won't be quite as efficient as it would in a single setup using the same turbo, but like Trent said, it is easier to run a big primary turbo in a compound setup than it would be in a single setup. You do lose a little efficiency running it in a compound, but you are able to run higher boost pressures in a compound setup than you are in a single turbo setup. You also have a much wider operating RPM band with compounds than you do with a single. The only reasons I can see running a single is if you race or pull in an organization that isn't compound friendly or money. I don't think the extra 100 or so pounds a compound setup ads is reason enough not to do it.

 

[TeaBagger2006]

thank you all.well if you guys dont think there is any big drawbacks then i dont feel so dumb, because i sure spent a lot of time thinking about this and couldnt find any major downsides(the reason for this thread), so i guess twins are the way to go.

again thanks for the info

 

[othrgrl]

I am a big single guy myself. The biggest things about compounds is the price and that most sled pulling rules put you in the unlimited class. A 3.0 charger is about the biggest you can go on a single and still use it to tow and still have it very street friendly. If you want 900+hp than compounds are going to be the only way to have it street and tow friendly.

 

[sweetdiesel]

I don't think the extra 100 or so pounds a compound setup ads is reason enough not to do it.

:hello: If trent would of had 100lbs less he would be in the 10s


Sorry Trent had to say it:hug:

Another small thing to consider is if you work on your truck alot .....there adds time in removal of the twins

This is all coming from a guy that wants twins though

 

[McRat]

I've run big singles, small singles, and big twins.

My take on it -

If you are into daily driving/towing, and have stock rods, the small single is going be the easiest and cheapest way to get max safe HP and still use the truck for your intended purpose. Small twins would be a great choice as well, but cost twice as much and require more modifications to the engine bay.

If you are into drag racing primarily, large twins or big single with spray.

If you are into sled pulling, single, due to the rule structure. Twins often put you in a trailer-queen class.

Currently there is a big single on our truck. Why? We couldn't use full HP due to course conditions, so there was no advantage to running twins. When we go back to drag racing, we will run the twins again.