more MPG with twins or singel turbo?

[subodh]

ive been looking for a turbo now

and i found a fair price on small twins or compounds is it

should i gain more mpg with that or a singel



the singel was 12/64



and the compound was the same turbo with a bigger s300 based to

 

[SShafranko]

Not sure on the MPG someone who has them would have to chime in. If i had to guess i would say better with the compounds but there are so many other variables with MPG.



If i had the choise i would go with the compounds for sure. You have the ability to grow your fuel system and other mods in the future if you desire to complement the compounds and properly tuned not many singles will come close to the spool up and overall performance of the compounds.



It is dificult to find a good single turbo that will spool quickly, boost enough, perform at the track, perform while towing. You usually have to sacrifice something such as daily drivability issues(surging), laggy spool up, top boost #'s etc. You have a wider array of options and more room to grow with the compounds as long as you can properly tune them to your current and future mods.

 

[subodh]

thing is that i found d-tech cheap stuff but now after reading it really dont have de quality. but on the other hand someone recomended them in a thread to me so im not sure what to do.
htt have pretty good deals to and i think i will go with a singel that is possible to put in compound when a few bucks turn up. . cause for now i need a turbo and injectors havent driven my ram for a month. miss it alot

 

[JohnBoy5]

Look at bd. i have a super b single and am plannig on upgrading to the tow twins. i like this super b single so far and am looking forward to buying the twin upgrade kit. some people slam bd but i am very inpressed with the turbo and tech support they have!

 

[SShafranko]

John do you know if you can use the Special in a twin combo?

 

[JJPage]

John do you know if you can use the Special in a twin combo?

Yes, it is what BD uses as their secondary in their R850 kit.



I have not noticed a difference in mpg, no matter what I change. My driving habits are mild 95% of the time, and between the big singles, now the compounds, Smarty, TST, I always stay around 14 in town, and 18+ on the interstate, truck alone. Towing the 5vr, 9-10.

 

[SShafranko]

Yes, it is what BD uses as their secondary in their R850 kit.



I have not noticed a difference in mpg, no matter what I change. My driving habits are mild 95% of the time, and between the big singles, now the compounds, Smarty, TST, I always stay around 14 in town, and 18+ on the interstate, truck alone. Towing the 5vr, 9-10.

Ahh thanks JJ. Wonder if i would be able to use my stocker as the primary?

 

[cerberusiam]

Ahh thanks JJ. Wonder if i would be able to use my stocker as the primary?

If by primary you mean the high pressure turbo, yes. Thats a favorite combo with something like an S400-480 for a set of budget compounds. Its limited to around 550 maybe 600 HP but its good until then.

 

[JohnBoy5]

John do you know if you can use the Special in a twin combo?

yes you can (BUT) depending on what you plan to do with the truck i could be cautious of using that turbo. Its a very large turbo and as a single has lots of lag. its more geared towards sled pulling and drag racing where you will build your boost then launch the truck. not a good stop light to stop light turbo.

Are you planing on doing the twins right from the get go?
what do you want to do with the truck?
how much HP are you wanting to make?

i think for fuel milage this would work against you as it take so much fuel to spool it (super b special)...


I bought the super b single and will be upgrading to the twin the first of the year asuming i dont get laid off. to date i am super pleased with the super b single by it self. i run 40 lbs of boost easy. and EGT's stay about 900 or less even towing my 30ft gooseneck. The best part its sounds freaking awesome!!!!!!!

 

[SShafranko]

I would like to upgrade to twins asap. Wanted to add 50hp sticks and a cam but I don't want to do anything until I resolvethis little issue I'm dealing with right now.

 

[SShafranko]

If by primary you mean the high pressure turbo, yes. Thats a favorite combo with something like an S400-480 for a set of budget compounds. Its limited to around 550 maybe 600 HP but its good until then.

I'm not really looking for much more power than that. I drive the truck every day and want to keep it reliable. It seems like I can't even do that now. Anyway I have the stock turbo can you direct me to a place where I can purchase the piping needed for this install? I guess I could call BD?

 

[JohnBoy5]

I'm not really looking for much more power than that. I drive the truck every day and want to keep it reliable. It seems like I can't even do that now. Anyway I have the stock turbo can you direct me to a place where I can purchase the piping needed for this install? I guess I could call BD?

Sure you can build a 500 to 600 hp rig as a daily driver. i am working on that now as we speak. you just need to do things in the correct order if you are not going to do it all at one time!





i will send you a pm and see what we can figure out about your case and then we can make some post for everyone to read!

 

[AMcCormick]

I am really curious about this thread. I have asked Left Coast Diesel (they did the mods to the truck before I bought it) if the Special would be worth using in a compound set up with the stocker, also asked BD as well. They both said that it would not be worth it. As the Special is not large enough to warrant the project? The special is the only after market turbo I have driven with. I feel that it is pretty slow to spool under 15-18lbs above that it goes pretty fast. 25lbs to 50lbs the truck is flying. i dont have studs so I have not pushed past that. Driving down the freeway I see about 5lbs. I would love to run compounds with the stocker if it works. Perfect world I could pull the Special off when the truck gets checked. The truck is plenty fast enough when she builds boost.

 

[Joseph Donnelly]

The big Super B Special from BD does spool much slower than the original Super B. For the “towing twins” and the R700 twins, BD uses the Super B as secondary turbo (that is the one mounted on the exhaust manifold that receives boosted air from the larger primary turbo whose exhaust outlet goes to the exhaust pipe). The primary turbo (a large S300 or S400 if from BD) takes in ambient air and compresses it, then sends the boosted air to the small secondary turbo. See my article in Issue 60, p. 94.

 

[fox]

Just a response with my experience.



The best mile I ever did see was with a PDRHX40.



I could do 22 on the interstate at 70-75.

With not much different but with an HX-35/12 and an S400 I don't see that. But, this set-up will out run it and out tow it!!!

I figure the free flow exhaust at low boost with the PDR40 is what did it for my truck. But towing it was 4+ seconds to light it and It would black out the entrance ramp by then.

 

[AMcCormick]

The big Super B Special from BD does spool much slower than the original Super B. For the “towing twins” and the R700 twins, BD uses the Super B as secondary turbo (that is the one mounted on the exhaust manifold that receives boosted air from the larger primary turbo whose exhaust outlet goes to the exhaust pipe). The primary turbo (a large S300 or S400 if from BD) takes in ambient air and compresses it, then sends the boosted air to the small secondary turbo. See my article in Issue 60, p. 94.

I have the basic understanding of how a compound system works. For racing sail boats we have sail cross over charts listing wind angles and strength for each sail and when the range of each sail crosses over with the next. this is what I do not know with the turbos. I understand that a small turbo will spool quicker but provide less overall boost. So would the cross over in ranges of a stocker and the Special work together. What i was told from BD was that it was not really big enough to make it worth while. I will have to smog this truck next month so??

 

[CDonaldson]

thing is that i found d-tech cheap stuff but now after reading it really dont have de quality. but on the other hand someone recomended them in a thread to me so im not sure what to do.

htt have pretty good deals to and i think i will go with a singel that is possible to put in compound when a few bucks turn up. . cause for now i need a turbo and injectors havent driven my ram for a month. miss it alot

I'm running the d-tech 62/65/12 ~ S475 and am very happy with the kit. Whoever says that Borg Warner turbos are not as good as any of the rest out on the market or are a 'cheap' setup is full of it or marketing for someone elses cause. As far as their kit, everything is good quality, they use pretty much the same parts as everyone else. As for power, the compounds I am using spool up as fast or faster than the stocker and the towing power is awesome. GREAT set of towing twins and running empty they are AWESOME power.



I'd buy them again for another truck in a heartbeat.





CD

 

[cerberusiam]

I understand that a small turbo will spool quicker but provide less overall boost. So would the cross over in ranges of a stocker and the Special work together.

Essentially no, you have to much cross over in the map to make it a worhtwhile swap. You don't gain enough air flow with the super B to make it a good low pressure turbo. Its map is very close to the stocker so gains are minimal. You want minimal ovelap in the map to make compounds function as they should.

 

[AMcCormick]

I have the "Special" single currently which is larger than the "Super". I do not know the specs. Posts earlier in the thread stated that the "Special" is used in Compounds this is what I'm curious about because it is pretty slow and smokey until she gets going.