The Junkyard Dog, 4200 Vega

Re: The Junkyard Dog, 4200 Vega

Postby limequat » Fri Mar 07, 2014 10:27 am

Is there any reason why well-controlled nitrous would be any harder on an engine than boost?

If not, seems that it should take 200. Or more.
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Re: The Junkyard Dog, 4200 Vega

Postby ca434sbc4 » Fri Mar 07, 2014 11:54 am

Dry shot - with MS adding fuel and timing retard - no issues with the MS - had some with the NO2 parts - long lines and no purge.
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Re: The Junkyard Dog, 4200 Vega

Postby AutoRoc » Fri Mar 07, 2014 1:53 pm

Nitrous is a bit harder on parts. Instead of pushing air into the engine, it is more like calmly feeding the engine high explosives. The exhaust side gets worked hard and distribution probolems arise with a single nozzle in a dry intake. Im a pretty firm believer that the first 100hp of a kit is the most productive.
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Re: The Junkyard Dog, 4200 Vega

Postby 3258 » Fri Mar 07, 2014 3:10 pm

limequat wrote:Is there any reason why well-controlled nitrous would be any harder on an engine than boost?

If not, seems that it should take 200. Or more.

I don’t know the physics behind it but nitrous seems to be much harder on parts. That’s just judging by what I see. I think possibly like auto said the burn gets more explosive causing higher peak cylinder pressures early in the power stroke rather than a lower pressure for longer into the cycle to produce the same power via turbo. Smack it with hammer (nitrous) or use a press (turbo boost) to move the piston down…. something like that. nitrous is not near as good of a way to add power as nitrous IMO but it has the capability of game play at the track that a turbo doesn't

ca434sbc4 wrote:Dry shot - with MS adding fuel and timing retard - no issues with the MS - had some with the NO2 parts - long lines and no purge.


Good to know, I figured I should put a purge setup on it.

AutoRoc wrote: The exhaust side gets worked hard and distribution probolems arise with a single nozzle in a dry intake. Im a pretty firm believer that the first 100hp of a kit is the most productive.

I have concerns about distribution... even more so because of how long the manifold is but I figure that with a 100 shot or less just make it a little on the rich side to be safe. Like most things I assume it gets exponentially more fussy on the tuneup with increasing amounts of nitrous. Did you run a wet or a dry system? Single or multiple?
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Re: The Junkyard Dog, 4200 Vega

Postby AutoRoc » Fri Mar 07, 2014 6:17 pm

Always wet nitrous express kits. Ran a 75 shot with a Shark nozzle on my TPI efi setup, worked great with their supplied jetting.. Then ran a few plate systems under carbs. 100-200hp. Alwwys ran the supplied tunes/jets. NEVER broke anything, ran well over 100 bottles. My stock 305 ate over 50 bottles, most at 150hp jettings.
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Re: The Junkyard Dog, 4200 Vega

Postby 3258 » Fri Jun 27, 2014 10:40 am

the wagon went some rounds last saturday. sent a few v8 engines packing. hopefully only a matter of time until i get a win with the JYD. people are starting to notice, i was inspected by tech 2X's and they made me tear into some wiring once. In motorsport where i am the only EFI car and people have an average IQ that of a rabbit it must look like i have something fishy going on. I do understand, i mean you can't jump right into to EFI too quick, its only been standard on almost all production cars since the early 80s, i mean its only been 30+ years !! I should put some carburetors on it.


On the datalogger i noticed my oil pressure was dropping off as it approached the 1-2 shift point in the run

i will need to go back and look at earlier runs (that was the last one) i am wondering if the acceleration is pulling the oil away from the pick up (front sump) or whats going on. It dropped down to about 20 psi for a couple seconds so i am not real worried about it but i wants to make it right, last time this happened I put about 1/2 q in the pan and it went away. really should build a rear sump, actually 2 of them since i am making one for the other car.
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Re: The Junkyard Dog, 4200 Vega

Postby limequat » Fri Jun 27, 2014 12:11 pm

What times where you running?
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Re: The Junkyard Dog, 4200 Vega

Postby 3258 » Fri Jun 27, 2014 1:34 pm

Slooooowwwww... yet pretty consistent for a car on a foot brake. if i wasn't driving the line it would have been within .03 for the event
this setup really seems to be affected by the humidity, the smaller engines like this that don't make much HP seem to loose more ET in the heat. The water grains were high, slowed to 12.59 ish. in November last year it was in the high 12.20's. I was down 2mph from 110 to 108

I also think that the cam phasing being "off" doesn't help things. still dont have that all figured out yet.
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Re: The Junkyard Dog, 4200 Vega

Postby limequat » Fri Jun 27, 2014 1:54 pm

lol, sounds pretty fast to me.
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Re: The Junkyard Dog, 4200 Vega

Postby 3258 » Sat Sep 13, 2014 11:54 pm

Image


Lime, time to update the ET list
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