Fuel System Question Theroretical

If a person has a flow meter and fuel pressure sensors on a data logger, plus Davenports jetsize software is it absolutly essential to get the system flowed? Would the datalogging coupled with the software not act as a flow bench? Provided you start out with a very safe tuneup and then work your way up using the data from the car?

I realize there is no real substitute for baselining your system by having it flowed on a calibrated flow bench but theroretically is it possible? Just curious.

Corey

 

That will work, use the modifier to match what you recorded.

 

It will work, it just may take a while to get it honed to where one of the fuel system gurus could get you in the first pass or two using their experience. The thing that worries me is how things get affected in the balance of flow when decent size changes are made in nozzles or the return loop.

 

what I would do is give Mike Canter a call I have his Number but I rather not give it out unless Mike said he did not care just some respect for the other person, I usally call him at the first of each season for a brush up on the davenport...lol..he is very helpful on the fuel system..Dave

 

Fuel System

Thats what I was hoping, over winter I plan to outfit the car with all the equipment listed in my initial question. I have a tune-up that was working pretty well and plenty safe, never really saw the need to flow a system when you have a 4 wheel flowbench strapped to your ass every run. Only downfall I can see to my method is as was stated earilier, I won't have the "fuel system guru's" to give me a tune up.

Thanks
Corey

 

Record the specific gravity of the fuel you are using, and add a fuel temp thermocouple to the data mix, and monitor a few different pressure locations, and you should be repeatable. Probably advisable to have the system flowed as a baseline to work from, initally. You could also add one precision wide band oxygen sensor (a quality one) and keep tabs on your exhaust gas lambda at one fixed repeatable location. The precision WBEGO sums a lot of the variables/errors.

 

If I was you.... I'd send your fuel system down to Davenport have it flowed and go pick it up when it's done and Les or Shaun will walk you through everything and you will learn more than you can imagine from those two guys. Why risk it when you have one of the best blown alky tuners around in your own "backyard" v

 

Im sticking with Mike..been there and done it..Dave

 

Fuel System

All the answers here more or less say that yes it can be done only with data from the car but its a good idea to get it flowed. I was wondering about the accuracy of the flow meter concept, if its off then there could be problems. Well, seeing as how Davenports is only about a 2 1/2 hr drive for me, I'll take the advice everybody has given and let them set my system up the first time.

Thanks
Corey

 

First the info in Jetsize must be exactly what you observed on the car, it doesn't even matter if your sensors are not particularly accurate as long as they do the same thing every time. Jetsize does not in anyway provide you with a "tuneup". After you establish a baseline running the air correction factors will tell you how to duplicate that run under different weather conditions. After a baseline is established then the flow information lets you figure other combinations that you might want to try. Every time the car runs better, re-set the baseline. You have to also consider that almost everyone opens or closes some jets going down the track so this has to be considered. One place Jetsize is a big help is that it will let you make changes to maintain your fuel pressure when the weather calls for more or less fuel. As an example, on our car we never run a main jet less than .080 or more than .085 at any track. If jetsize calls for anything else we will adjust the nozzles and pump sizer.

Jetsize is a great product but like all tools it relys on the operator.

 

The main fact is the car actually becomes an accurate flowmeter and when used with a good baseline and program like jetsize accurates changes can be made. However you need somebody that has experience and knowledge on fuel systems after all the datalogger will be displaying information. Not knowledge. ....

 

Ya, I'm new to Jetsize and tuning with a logger so I think I'm going to bite it and let Les and Shaun point me in the right direction. I'm into this new engine for a lot of money and the few extra dollars to flow the system seems well spent. Rather than burning something or worse.

Corey