POS 12V Hits the Dyno

My father in law did 398 with an entirely stock truck except injectors. Had a very mild set of II dragon fly injectors and 18* of timing on his 95 Dodge dually. Torgue was like 830 or 840 on Floor It Diesels Dyno. It impressed me!!
 
Mine's not quite in that bad of exterior shape (paint holes etc.) but i'm with everyone here and that's my plan. Make it quick then put the bling to it ha!

disclaimer: my bling is not that of a rap video......:p
 
Jim Fulmer said:
Your has more in it! On the truck I was talking about it makes it easy when the trucks owner has a dyno.

Jim
Click to expand...

Dang, theres another dyno meet next saturday. Im hoping to put some twins on it by then. I got a freshly rebuilt ht3b/23cm divided entry for $350 from a buddy and all the piping for another 200.

Do i have enough fuel to drive around with twins?
 
Cursedtofirst45 said:
Dang, theres another dyno meet next saturday. Im hoping to put some twins on it by then. I got a freshly rebuilt ht3b/23cm divided entry for $350 from a buddy and all the piping for another 200.

Do i have enough fuel to drive around with twins?
Click to expand...

Oh yea, there is an internet misconception that Twins take allot of fuel to work properly, they don't and with that setup you should hit max power quickly.

There is one thing I don't like is you are running just an 18.5 housing and no gate, so what ever power you make is going to have to go through that little housing. If you keep this setup I'd look into an external gate system that blows off into the hot pipe, E.D. has the best setup out there in my eyes.

Jim
 

Attachments

  • External Gate.jpg
    External Gate.jpg
    29.7 KB · Views: 25
Last edited:
Jim Fulmer said:
Oh yea, there is an internet misconception that Twins take allot of fuel to work properly, they don't and with that setup you should hit max power quickly.

There is one thing I don't like is you are running just an 18.5 housing and no gate, so what ever power you make is going to have to go through that little housing. If you keep this setup I'd look into an external gate system that blows off into the hot pipe, E.D. has the best setup out there in my eyes.

Jim
Click to expand...

Oh, for the twins im switching housings on the 35 back to the 12cm wastegated. Ill have the wastegate opening around 30 psi, do you think this should work well?
 
Cursedtofirst45 said:
Oh, for the twins im switching housings on the 35 back to the 12cm wastegated. Ill have the wastegate opening around 30 psi, do you think this should work well?
Click to expand...

When I tell you to do this think of it as a hail mary pass ok, not just for you but for everyone else.

If you use the stock 12cm housing and it is not modified (volutes drilled, bigger flapper) then the next best thing to do is put a T-3 flange (non divided) between the turbo and manifold, that will allow you to vent all 6 cylinders when the gate opens up.

People that still use a Holset in their kits (only a few) either do it like this or they drill a size able hole under the flapper to do the same thing. There are down sides to each, drilling the volutes will cause it to crack in time with high EGT's, putting in a spacer will cause the hot air to erode the passage some and of course it will get some cracks, they will all crack, the last thing is to machine down that lip between the two some and that will require a T-3 turbo gasket (undivided) These things are about as good as you can do with that setup and not running an external gate.

Jim
 
Here is the old gate setup I was talking about.
ExternalGate.jpg
[/IMG]

and I was wrong about the dyno numbers, I found the sheet over on the TDR when I went after that gate picture.

ChucksDynoSheet.jpg
[/IMG]

I'm still trying to find the machined housing so you can see what I'm talking about.

Jim
 
Jim Fulmer said:
Here is the old gate setup I was talking about.
ExternalGate.jpg
[/IMG]

and I was wrong about the dyno numbers, I found the sheet over on the TDR when I went after that gate picture.

ChucksDynoSheet.jpg
[/IMG]

I'm still trying to find the machined housing so you can see what I'm talking about.

Jim
Click to expand...

ok, i plan on doing an external gate this summer when i start working full time again, but right now im still in school fulltime w/ 18 credit hours. My twins will be ghetto at best, but im expecting them to be this way so it'll be ok until this summer when i can fab up a wastegate passage and throw one on. Is it best for the top turbo to be wastegated in a twins setup and let the bottom turbo be non-wastegated? Im assuming that the excess pressures would help spin the bottom turbo.
 
Nope, an S300 series would work much better, look at it like a long term plan and they work really good (without) an external gate.

Jim
 
Jim Fulmer said:
Nope, an S300 series would work much better, look at it like a long term plan and they work really good (without) an external gate.

Jim
Click to expand...

okay, ill plan on an s300 this summer. But ive seen hx35/ht3b combos before in sigs, so they must be at least decent?

Not that im planning to keep this combo forever, but it should be okay for a few months right? Should i keep the hx35 non wastegated until i update?
 
The secondary turbo in twins always needs a wastegate IMO.
Without doing anything the large volume of air through the engine from the primary will cause the secondary to overspeed causing excessive pressures and overheating the air reducing the density. Just use an undivided spacer and the stock housing at least.

$.02
 
You must log in or register to reply here.
Back
Top