5.9 mud racer

the work we did on the dyno is opposite of what your saying.

according to you our motor should run cooler with the hx82 3.6 and 600ccs than the 2.8 s400 and 600cc's correct?

we ran both setups and 600cc's with the hx82 and the motor would run so hot it wouldve melted before it made it halfway down the pull track

like I said practice sometimes differs from principle

if our motor is so grossly over fueled to cool the egts it must be working It won 2.8 at schied in 08 and 2.8 at ts in 09
 
gotta12v said:
if our motor is so grossly over fueled to cool the egts it must be working It won 2.8 at schied in 08 and 2.8 at ts in 09
Click to expand...

That's what I'm thinking, and it sure looks like it is working...

If I may ask, Where are you increasing the duration?

Is more fuel getting injected later, or earlier? I assume you can change this with the pumps cam styling.

Are you trying to inject alot of fuel, and then dribble it off, or a little fuel to get the fire going, then alot more fuel to cool it off, or keep it cool?

I'm really curious, and super excited to learn.

Thanks,
Merrick
 
gotta12v said:
the work we did on the dyno is opposite of what your saying.

according to you our motor should run cooler with the hx82 3.6 and 600ccs than the 2.8 s400 and 600cc's correct?

we ran both setups and 600cc's with the hx82 and the motor would run so hot it wouldve melted before it made it halfway down the pull track

like I said practice sometimes differs from principle

if our motor is so grossly over fueled to cool the egts it must be working It won 2.8 at schied in 08 and 2.8 at ts in 09
Click to expand...

i'm curious though how overfueled you were with that hx82 though... its been said that a light haze is the best air/fuel ratio for making power with a diesel, i'm curious as to what would happen if you guys got an even bigger charger and tried to use up all that fuel, what would happen with the EGTs? would they start dropping again just like they do when you add more fuel? i'm thinking they would...
the only problem is that in pulling you can't just keep up-sizing the turbo
 
I guess the only way to figure any of this would be to be able the measue the air fuel ratio. measure the stock air fuel ratio then proportionally add fuel and air at the same rate.

but heres the monkey wrench. In order to turn a larger turbo it requires more engine rpm. as engine rpm increases the window of burn time decreases. this is why we have to increase injection timing, add more fill time to the injection camshaft in the pump increase the delivery rate of the pump (both in the injection ramp and larger plunger and barrels)

the only way I could see this sort of research being done would be with a stand alone ecm on a cr setup.

you would have to proportionally increase fuel with the increase in cfm of air as well as keeping the injection rate in proportion to rpm.

another reason why we run large nozzels to deliver the large quantity of fuel fast.
 
MCummings said:
That's what I'm thinking, and it sure looks like it is working...

If I may ask, Where are you increasing the duration?

Is more fuel getting injected later, or earlier? I assume you can change this with the pumps cam styling.

Are you trying to inject alot of fuel, and then dribble it off, or a little fuel to get the fire going, then alot more fuel to cool it off, or keep it cool?

I'm really curious, and super excited to learn.

Thanks,
Merrick
Click to expand...

by increasing duration all I mean is we add fuel via rack travel from the pump
(if its hot at 600cc's well add 50cc with some more rack travel form the pump)

in a high rpm motor you want a fast injection cam, however the way the opening ramp is ground probably differs from each pump shop. this is why some pumps can run more time and make power (they are slower opening ramps) and other make more power with less time

cut dvs add alot of early and late fuel (and smoke) however most race pumps run them as it removes a restriction in the system. how a race pump would run with a regular dv I dont know, however most pump shops will tell you that it will cause to much internal restriction and beat the cams out of them
 
humm hearing about all this makes me wonder how long it'll take until the CR systems surpass the mechanical pumps for highest hp... think about how much fuel those CR injectors can get out in a VERY short amount of time... i know that this is the main reason why the 7.3 has issues with making high hp... the injection system simply cannot flow enough fuel in that short of a time period...
 
I agree that the cr with the ecm capabilities the cr could surpass the mechanical. however at elevated rpm Im not sure if the cr injector could fire fast enough (remember it has to fire 3 times per power stroke)

for all out performance piezo injectors would probably be needed (can fire much faster)

even still the peak numbers may not be higher (the mecanical system can already make more power than the block can take) however much larger power curves could be achieved and the motor could be made to be much more responsive wich will be crucial for a diesel to ever be a competitive drag racer.
 
Chester,how is it going? Been awhile.This is Tyler, Donnel's nephew. Scott has been telling us about this truck yall have been working on.Look's like yall got it running pretty good!
 
gotta12v said:
I agree that the cr with the ecm capabilities the cr could surpass the mechanical. however at elevated rpm Im not sure if the cr injector could fire fast enough (remember it has to fire 3 times per power stroke)

for all out performance piezo injectors would probably be needed (can fire much faster)

even still the peak numbers may not be higher (the mecanical system can already make more power than the block can take) however much larger power curves could be achieved and the motor could be made to be much more responsive wich will be crucial for a diesel to ever be a competitive drag racer.
Click to expand...

if there was a way to get rid of those multiple injections per power stroke i think the CR system would do MUCH better!!! or if it was able to basically "shut off" 2 of those 3 injections and just have one big one... and talking about piezo injectors, the 6.4 uses i believe 7 injections per power stroke
 
The Bosch software allows you to do pretty much whatever you want, it's a standalone controller..

---

Chester, Keep up the good work. That truck is totally awesome.
Quick question, Have you thought about using high temp coatings for the head and pistons to slow the melting?

Merrick
 
Hey didn't want you all to think I had abandoned this. I am just sitting quietly taking notes and drawing out some ideas.

Thanks again
Chester
 
Ok folks....just got my bearing back, its been a busy summer. We have done our research and made some changes. I am getting all of the video together. Here is something just to keep you going. This is video that was taped the next day after our tests. It was BEFORE this thread started. I WILL have some new video for you, with much better results, in the next week.

YouTube - The First race of 2009
 
tnunnelee said:
Ok folks....just got my bearing back, its been a busy summer. We have done our research and made some changes. I am getting all of the video together. Here is something just to keep you going. This is video that was taped the next day after our tests. It was BEFORE this thread started. I WILL have some new video for you, with much better results, in the next week.

YouTube - The First race of 2009
Click to expand...

U GONNA BE AT THE SUGAR FARM AT THE END OF THIS MONTH?
 
tnunnelee said:
Ok folks....just got my bearing back, its been a busy summer. We have done our research and made some changes. I am getting all of the video together. Here is something just to keep you going. This is video that was taped the next day after our tests. It was BEFORE this thread started. I WILL have some new video for you, with much better results, in the next week.

YouTube - The First race of 2009
Click to expand...

need either more air or more fuel to cool that thing down!
 
Is that a 24V pistons??? looks like the bowl is in the center.. Little hard to tell with the conditions..
I think I'd try a bigger charger.. with the NOS to spool it.. and get the bugs out of the water... That thing is super impressive...
Good Luck
Bryan
 
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