Just a little more . . . . .

How to make it go fast

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Re: Just a little more . . . . .

Postby oldestof11 » Thu Sep 18, 2014 4:29 pm

BC, do you still have the "gooseneck" hot pipe from the secondary to primary?
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Re: Just a little more . . . . .

Postby RCCUMMINS89 » Thu Sep 18, 2014 5:10 pm

My injectors are not as large as yours.... not even close... but, I see 50-75psi worth of case pressure drop when hammering down.....I gain 60 psi (same as at idle) when activating the ksb. REGARDLESS OF MY CASE PRESSURE REGULATOR SETTING, I see the same 60 psi gain when activating the ksb. I have just never seen where the actual vane pump is the issue.


Now... the ksb doesn't completely close off the fuel flow through that tube. It merely regulates it to a 60psi increase at a stock setting made up by Bosch... Due to me not seeing that 60 psi increase changing with injector size nor load, that leads me to believe that it can in fact keep up.

Especially when 14mm h/r folks with injectors as large as what you are running are still able to maintain 200+ psi of case pressure at 3000rpm.

Perhaps, one of these days, I'll myself fiddle with the ksb line doo hicky.... but as of right now, with my size of injector (roughly 5x17) I gain basically (very close) to 100% of it back by simply activating the ksb.
89 RC on shortened 92 diesel frame - NV4500 w/dual disc/4.10s on 37s. - Self built pump, "hot screw", lots of timing, True high volume low pressure lift pump, 62fmw/68/.7gated, 77lpm SAC Inj., Studs/O-rings,- 423/1220 Mustang - 11/16/2013 http://www.TheHungryDiesel.com full line dealer, if you don't see it please ask.
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Re: Just a little more . . . . .

Postby BC847 » Thu Sep 18, 2014 5:46 pm

oldestof11 wrote:BC, do you still have the "gooseneck" hot pipe from the secondary to primary?


Yes.

RCCUMMINS89 wrote:My injectors are not as large as yours.... not even close... but, I see 50-75psi worth of case pressure drop when hammering down.....I gain 60 psi (same as at idle) when activating the ksb. REGARDLESS OF MY CASE PRESSURE REGULATOR SETTING, I see the same 60 psi gain when activating the ksb. I have just never seen where the actual vane pump is the issue.


Now... the ksb doesn't completely close off the fuel flow through that tube. It merely regulates it to a 60psi increase at a stock setting made up by Bosch... Due to me not seeing that 60 psi increase changing with injector size nor load, that leads me to believe that it can in fact keep up.

Especially when 14mm h/r folks with injectors as large as what you are running are still able to maintain 200+ psi of case pressure at 3000rpm.

Perhaps, one of these days, I'll myself fiddle with the ksb line doo hicky.... but as of right now, with my size of injector (roughly 5x17) I gain basically (very close) to 100% of it back by simply activating the ksb.

You're right, . . . . the KSB actually has two or three adjustments on it to set what it does, when and how much. Not necessarily screwdriver adjustment perse. Specific springs and such. They're capped with staked-in balls IIRC. Whole new world of fine tuning . . . . . have at it. :D

With no KSB circuit, my mess has the more basic NON KSB regulator. Certainly it's got specific sized orifices and spring based on it's intended application (I can't tell what that might have been). I've just run it in so as to have 100(ish) psig at idle. With no load, just revving the engine up good has the case pressure in the 200psig range (+/-).
With a case-pressure gauge under the windshield wiper, I can floor the throttle from a stop and on the way up (insert "YeeHa!") I can back off the throttle a little and see the case-pressure go up. Go back down on the throttle sees the case-pressure dip.
** As a side-note, pinching-off the IP fuel return (overflow-valve output) in the above example increases case-pressure by around 5psig.



Anyhoo, I don't have a KSB . . . so . . . .. :)
David

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Re: Just a little more . . . . .

Postby diesel freak01 » Thu Sep 18, 2014 6:28 pm

I may be way off base here but I'll throw this out there. To the compressor surge on the turbo, do you have a MWE ring in your housing? We had terrible surging with the tractor, put a housing with a map ring in and it completely changed the tractor. Not sure if I helped or not but there it is!
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Re: Just a little more . . . . .

Postby fatty » Thu Sep 18, 2014 10:44 pm

Any interest in supercharging? A few folks have had pretty good luck with that. Properly sized pulleys/blower should get you instant boost off idle. I've seen where guys even have them set to make 3-5 psi idling.
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Re: Just a little more . . . . .

Postby Tacoclaw » Fri Sep 19, 2014 4:15 am

I wouldn't bother for an auto truck, you can play with turbos/TC stall and get whatever you want in terms of spool. Only downside is what works for racing isn't the best for DD-ing, which BC does seem to do. :?
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Re: Just a little more . . . . .

Postby oldestof11 » Fri Sep 19, 2014 4:36 am

I think updating the turbos to ball bearing primary and smaller secondary is best bet. I bet you pick up another 20hp from the smaller secondary alone.

What is the primary pushing to the secondary right now?
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Re: Just a little more . . . . .

Postby RCCUMMINS89 » Fri Sep 19, 2014 7:29 am

I agree.... re do the whole compound setup with the newer stuff.

I just re read through everything.... I'm sitting here trying to give ideas on how to burn the fuel up top... when the entire point of the thread was to help clean up the low end. :lol:
89 RC on shortened 92 diesel frame - NV4500 w/dual disc/4.10s on 37s. - Self built pump, "hot screw", lots of timing, True high volume low pressure lift pump, 62fmw/68/.7gated, 77lpm SAC Inj., Studs/O-rings,- 423/1220 Mustang - 11/16/2013 http://www.TheHungryDiesel.com full line dealer, if you don't see it please ask.
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Re: Just a little more . . . . .

Postby oldestof11 » Fri Sep 19, 2014 2:15 pm

Yep.

Does Dave have one of your AFC springs Eric?
Jon
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Re: Just a little more . . . . .

Postby RCCUMMINS89 » Fri Sep 19, 2014 2:35 pm

Nope, but with the way his afc is seeing air I wouldn't recommend it. he is running it off the primary, and thus working fairly close to stock.
89 RC on shortened 92 diesel frame - NV4500 w/dual disc/4.10s on 37s. - Self built pump, "hot screw", lots of timing, True high volume low pressure lift pump, 62fmw/68/.7gated, 77lpm SAC Inj., Studs/O-rings,- 423/1220 Mustang - 11/16/2013 http://www.TheHungryDiesel.com full line dealer, if you don't see it please ask.
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Re: Just a little more . . . . .

Postby dazedandconfused » Fri Sep 19, 2014 4:38 pm

I've messed with a few old school HX35/HT3B setup. Just swapping exhaust housings on the 35 would drastically change spool up down low.
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Re: Just a little more . . . . .

Postby BC847 » Fri Sep 19, 2014 5:38 pm

chit's expensive. :pale:

I hadn't thought of a SC.

nah.
David

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Your basic farm truck ;)
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Re: Just a little more . . . . .

Postby AHineman » Fri Sep 19, 2014 5:55 pm

Takes too much power to run a supercharger.
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Re: Just a little more . . . . .

Postby Tacoclaw » Fri Sep 19, 2014 6:49 pm

Not setup my way, the blower is completely unloaded when the turbo is spooled.

Giant PITA to deal with the bypass, but a "simple" check valve would do the same thing.
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Re: Just a little more . . . . .

Postby 93flatbed » Fri Sep 19, 2014 7:26 pm

If money was no object, 3 Garrett gtx30r's. Large gate on the manifold.

If money is a problem, 3 hy35's or 3 351's.
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