Davenport Jest Size program

Could anyone tell me the pro's and cons of the program. Talked to a engine builder said to be very cautious, in that you could blow your motor up very easy. Thanks in advance.

 

That's a pretty bold statement from your engine builder. If you do a search on here for Davenports program, you'll find nobody has anything bad to say about it.

 

That builder probably hasnt used it, it's very helpfull

 

it works off your fuel system and runs, not someone else's.

 

jets

i dont think he knows what he is talking about if u have a bace line it works with that now if he is on the verg of bloing it up then yep it will fallow suit it is great

 

It is just the opposite of what the motor builder told you it will save your motor...my trust would go with les davenport not your motor builder..Dave

 

Jet Size is a good program, but is not what you would call user friendly. It takes a little time to learn. It really serves two purposes, it is a virtual flow bench, and it will help you duplicate runs you have made before, but under different atmospheric conditions. It is very important to maintain the baseline file, because otherwise it is just helping you duplicate bad runs.

It helps a lot with "what if" ideas. If you put in an idea and it comes back that it would have 600 psi of fuel pressure or require a .300 main jet, you know to change some things.

Like all software GIGO applies.

 

Dead on the money there. The more I've gotten into the motor side of things, the more I've learned to appreciate the program. Save all your work! The biggest thing to remember is that it doesn't tell you what to do in terms of your setup, you have to figure it out, it will just tell you based on your current areas with this pump, if you want this much fuel in the motor, use this main jet for these conditions. Then, using your data logger you can go back and verify flows and pressures in high gear, just remember to reference whatever RPM your baseline pump flow was taken.

I've used it for a trouble shooter as well, you have the proposed setup and you go make the run using it, flow and pressure were not at all what you expected, expected leaner, stayed rich situation. Assuming you have your baseline saved, you can go and unlock the program and enter the real pressure numbers you saw and almost 10 times out of 10, the program will then match your flow data by adjusting pressure and you can adjust your areas accordingly.

Long way of saying, badass program.

 

Jetsize

Ditto from here. It is the best program I've ever worked with, and the support from Shawn is great!

 

What other programs are out there?

 

Spud Millers

 

Jetsize

I won't go racing without it. Now if you don't have your fuel system flowed so that you can start out with real numbers it won't help. Have your fuel system flowed then put that data into Jetsize and it will do wonders to keep your motor safe. If your engine builder doesn't like it he either hasn't used it or maybe his advice isn't too safe itself. Jetsize is really designed for blown alcohol motors, I don't know that it will help with naturally aspirated motors. Dave Germain

 

Just to echo the above, once you find the "sweet spot" with your tuning modifier and baseline setup it becomes part and parcel of your team! The support from Sean Brown is absolutely first rate too, one of the nicest, knowledgable and genuine guys I've ever had the pleasure to work with.