Arrrrrrrrrrrrhhhhhhhhhhhhhh!

That is not an arguement...comparing apples to oranges.

They run nitrous to account for a single that is not designed to flow for the peak hp. Their singles are smaller...to make them more streetable...I mean smaller...like a 5000.

Once a Big Brother spooled on a truck...running as a single...it would make more hp than it does in a set of twins. That is what I am saying.

 

Gotcha...can't help it, I like apples and oranges, but at different times, and for different reasons...see why I call it a fir comparison Sometimes, I just like being difficult!

I understand your side, but like I said, I'm being difficult!

I would like to see a big brother on a truck as a big charger, an then as a single...maybe I SHOULD build my engine for 5500RPM, and then try my GT45R as a single

Thanks for putting that idea in my head...now I owe you one
Chris

 

I talked to a guy at Industrial injection who says the silver66 will light up at 1500 rpms thats low enough for me. but still at the same time I am so confused. I dont know if I should order the turbonetics T66 or get idaho twins. the T66 is supposed to be even better than the Silver66 I think a big single will be fine because my truck 06 dodge will be finished in a few weeks and I got crazy larry/edge hot juice/dual cp3 ppe/150ddp sticks/fass150 which I think is plenty of fuel upgrades to feed that turbo. I have this feeling I wont be dealing with lag

 

Youll have lag with those sticks. But you sure should have no problem with hp.

Kevin

 

If the decision was b/t a large single or a set of twins I would go with the large single over twins b/c I can't justify the cost of twins and still put up with a lag. But if it were b/t a large single and a compound setup I would go with the compound, which is what I will be doing so we'll see how I like it...

 

You know you just made a hypocritical statement don't you?? Compounds are twins, twins are compounds. (Unless ofcourse your gonna try and run 3 turbos) LOL

 

A set of 150hp honed injectors being fed by dual Cp3's and a heavy duration box will need a lot more turbo than a single 66mm. There are people on the various diesel forums running mid-600hp with that turbo and stock injectors on the same year truck as yours and will almost see those temps. Its gonna be hot.

 

Not really. Twins are supposed to be two identical turbos, whereas compounds are two turbos of different sizes. But "twins" or "twin turbo" just sounds a lot cooler so that is why we all say that instead.

When I get compounds, I kind of want a small sticker on the side of the hood that says "Twin Turbos" or something, but I'm really having a hard time with it... I don't want to advertise incorrectly, ya know? But a "Compound Turbos" sticker would just be lame. *sigh*

 

I always thought any time a diesel was referring to "twins" they were compounded. Thats kind of the reason they spool harder than a big single.

If you had two identical turbos vs a big single (of approx same size) the spool characteristics would be nearly identical. The only reason we run twins on gassers (cars mostly, vipers etc.) is packaging issues. It's just easier to hang a couple 76GTS or PT88's up front compared to a 106mm T6 single, at least without hacking the living chit out of the front of the car.

That is till you get wild and need a pair of T6 88s, then you're just up a creek. but a fun one at that.

 

Hey guys, new to this forum, i think compound or twins is deff the way to go, it may be a little bit of money for the system but well worth it, it seems like all of ur high hp, low et trucks are going this route. I know that u can get some good power out of a single but i seems like u almost have to run nos to get that spool up quickly. Nothing like popping the hood and seeing 2 huffers with an external wastegate and ceramic coated piping to get the blood going!

 

Correct, although on a cummins you cant have true twins because its a straight six, the V block d max's and 7.3's/6.0's can run them because they have the other side. I still call mine twins anyways, you tell someone you have compounds thats not into diesels just kinda looks at you funny

 

This is comming out of left field but theres a handful of D-max guys that run very large singles w/o no2 and still put down huge numbers and super low ET's.

Before everyone jumps on the twin band wagon do some Searching because you may be suprised to learn that twins do have lag issues. Especially the twins that will produce higher HP then singles like the larger ATS. In fact there have been a few members not happy at all with their ATS twins and how they spool. Well duhh your still trying to spool a A3K through a A5K and im sure that going to be alot more laggy then a Silverbullet. Now the BD twins are smaller then ATS and most people that have them are happy with them, bit initially people wernt that happy with the HP they provided but now as technology advances and we're learning how these HPCR engines work a few people got them dialed in at 600hp+ as oppose to 500 a few years ago when some people thought all you needed was twins and a TST/EZ to make lots of HP.

My theroy on twins is that if im going to invest my $$$ into a set I want to make it worth my while and get a really nice set of big twins, that will blow singles away in HP, ET's and spool. Problem is that no one yet has really done that yet.

The new Artic air twins seem to be a good affordable set up since you keep your stocker and add a ht3b??

For me im 100% happy with my big single SB and suprisingly it spools great and is simple. Of course if I had $$$ comming out of my ears Id go find the best in the busniess and get a sweet set of custom twins and EFI live to make thoes babies rock

 

I went from stock turbo -> HTB2 62/12 -> HTB2 62/14 -> SPS 66 -> SPS 62 -> current BD twins. This is my experience:

Big Single pros:

1) ease of tuning and setup. Plug-and-play essentially.
2) price
3) newest batch out there will support as high power as some twins, but at expense of higher EGT

Big single cons:

1) smoky, surging, lag pig around town and towing unless wound up at higher rpms and/or faster speed to keep engine air demand up to minimize excursions into surge zone on the compressor map.
2) cost me 2 mpg on average fuel mileage because of above
3) power delivery feels like a 2-stroke - peaky. This causes the sensation of "spooling as fast" as smaller turbo. I would encourage anyone to dyno a small single and big single versus time. With what I dynoed the bigger SPS 66 took about 1-2 seconds longer to get to the same power level as an HTB2 62/12 for example.

Twin turbo pros:

1) supports sustained high power levels longer due to EGT
2) power delivery very linear, smooth
3) EGT about 300* less than running a big single at same box and injector levels.

Twin turbo cons:

1) dyno proven to cost me 13 HP to drive an extra turbo
2) frickin clamps and boots that blow off
3) cost of set of twins versus a single. Although I'm only $2800 into my set... I would have saved even more money if I just went ahead and bought twins right away.
4) tuning is time consuming at first

If I didn't come across this good deal on my twin set I would probably still be running my SPS 62, however, since I didn't know any better.

However, if I had a chance to drive a twins equipped truck versus a big single equipped truck over numerous driving conditions before making a decision to upgrade turbos, I would probably fork out the extra dough for twins.

Again, just my opinion...

 

I agree twins for a around the town monster is the way to go. I am considering going with PDR, they seem to have some stupid fast twin trucks running around, and since i already have a Custom B-1, i can add the B-2 Bomber and take it from there. Not to get off the subject but maybe one of the twin guys can chime in, has anybody gone with the fire o ringing on the cylinder head and has anybody had luck running a copper sprayed Cometic head gasket?

 

J.Stiger I think you should change your Big Single cons title to SPS 66 cons...

I say this because not all big singles act the same. My big single which is a Silverbullet is a night and day difference in spool between a sps66.

Everyone I tell this to doesnt believe me until I take them for a ride and then they soon learn all about the Silverbullet and Smarty.