Which Injectors?

[Luken]

even unloaded some of the big singles like a 66 surge for just daily driving. Are they as user friendly as a good set of twins, that don't have EGT issues, are safer to drive in low traction situations and don't surge? I don't think so. Maybe I am just naive but I actually drive my truck every day and I don't want the headache of a big single that surges and is peaky, I know that twins are more than twice as much money but I live by the do it right do it once attitude.

Isaac

Isaac

So your saying a 66 surges under daily driving and has egt issues?



I also drive my truck everyday and have no headache with my big single, now towing heavy loads is a little different story but you get used to it. Twins are twice as much money and get the job done for some... I run a single because I cant have twins and sled pull. Im not putting down twins at all, they're great... but if people listen to you, "big singles" are junk and the only way to go is twins...

 

[mcoleman]

My truck is a 2nd gen but the only way I see surge with my 66 is if I let it get below 1500 rpm in overdrive in the hills. I don't have EGT issues for daily driving but yes I do turn my box down when I'm not wanting the extra power. And for towing I run the TST on setting 3.

 

[mattymac]

Yes. Like i said, mine is at 703 with no NOS and it has a goose neck hitch and pulls cattle trailers around daily. Its even got one on John's pumps on in now and can really pull now. BUT, and this is a big BUT, ... the ability to run a big turbo is done much easier with a common rail. I've tried putting my turbo on several 12v's and its just sits there and smokes and turbo barks all day long. And thats why i like the common rail because of the abilty to spool turbos, because whoever can run the bigger turbo on the street is going to win(racing around town). Several reason why I'm not fond of twins are: its too hard to regulate boost both top end boost and middle range boost, especially when towing, ... . its less reliable, meanning that hoses are wanting to blow, intercoolers are wanting to blow and gaskets are wanting to blow. Now, back to regulating boost when towing. Say you have a fifth wheel camper and you are going up a long hill,. . with twins its very, very hard to keep the boost under 40 psi. Okay, your EGT's may be low, but what isn't, is your boost. As boost rises so does the temperature of your charged air. At 20 psi the air going through the intercooler is 210 degrees. At 40 psi boost the air is 420 degrees. Okay, so 420 degrees going through your intercooler is being radiated in front of your radiator, becuase the intercooler sits directly in front of your radiator. So driving up a hill with 20 to 40 psi boost is like driving in the midlle of Death Valley when its 210 to 420 degrees outside. Your engine water is going to get hot. SOOO, with a set of twins, EGT's are not the problem but engine water cooling is. What i have found on the common rail is that with a large single, ... if you can keep the rail pressures high enough, and get a complete burn the egt's will be in check. With Don's 40 inj and the TST on level five and 703 HP, the eng would never seeover 1250 degeres at WOT. Now with Don's 100 inj. this is a different story. Keeping rail pressure up is a little harder now.

Moral of the story is this, I'm not putting down owners that have bought twins, but I'm informing people in the market for twins. They cost a fortune, they make the head gasket and everything air related less reliable, and when the problems start happening this really discourages the owner. And my thought is that the owner should be happy with his truck. Thats all. These are my thoughts, take it for what its worth. There are lots of ways to make power. On the common rail, i spent my money on fuel and air, and not on the long block. This is what Joe D. did and he was very succesful.

REB, I cant help reading this and thinking to myself, you say that twins are harder on headgaskets than a single? If you take a nicely mannered single lets say an II SPS 62 whats the Drive pressure at 50lbs? I dont know exactly but I bet its over a 1:1 its cooling efficiency is at the end of its map (making more air temp). Now take a nicely mannered set of twins, I will say PDR towing twins, HX35/3B what do you think the drive pressure is at 55lbs? Once agin I dont know exactly but I bet its 1:1 at minimun if not under that. Now with that said, what is boost? Its actually a restriction measured in air PSI. Backpressure is the main reason headgaskets blow, at the same boost no comparable nicley mannared single will cool better and in most cases be more reliable than a niceley mannared set of twins.



Your post says your informing people in the market about twins, They do cost more, but I dont think they are any less reliable or problematic than some big singles out there, Trust me I know with my SPS 66! Which has been a great turbo but it surges horably when towing, underboost codes (which happens with twins as well) and still runs warm for me, while having about the same spool as some decent sized twins, And this turbo spools well for a single of this size.

 

[AK RAM]

I've seen AKRam run a quarter mile with the BD twins and nothing but a little haze at launch.

http://cumminsforum.vidiac.com/video/35DF4C14-14DE-4B0D-95A8-3E98246F51C0.htm Oo.

 

[Tomeygun]

John,

you have to read my reply to extract my point, "if you want to make big power all day long without headaches". Tommy's truck was a self-described nightmare for him to drive at 526hp every day. It smoked it was really peaky on the power and just wasn't fun for him to drive. He put in a set of injectors (F1) and one of your pumps and made 604 on the dyno. He states that he doesn't drive the truck around at that setting but at a setting that is estimated around 450hp. Bondo drives his truck around at 565hp everyday without any headaches. I use the example for motorcycle guys as looking at the difference between the powerband on a KX80 and a KX500. The 500 is much less violent when it hits the pipe but it pulls much harder and for longer once it gets there, just like twins. A big single is a peakier power like a small 2 stroke engine, once it hits the pipe all hell breaks loose and you are along for the ride. Are there big singles that work well for daily driving? Yes there are, 90% of them aren't any good for towing heavy loads over a long distance and even unloaded some of the big singles like a 66 surge for just daily driving. Are they as user friendly as a good set of twins, that don't have EGT issues, are safer to drive in low traction situations and don't surge? I don't think so. Maybe I am just naive but I actually drive my truck every day and I don't want the headache of a big single that surges and is peaky, I know that twins are more than twice as much money but I live by the do it right do it once attitude.

Isaac

Isaac

Actually that was true BEFORE the injectors. Now the truck is WAY easy to drive when it is on the 600hp setting... The injectors smoothed out the TST a ton!!



I had said that in my injector thread I had thought...



SO FORTHE RECORD - the TST alone was a bit tough to drive , but the CP3 and F1 sticks made is super smooth, enough I dont mess with the setting anymore... .