maleko89 said:
Wfcall, I'm interested in hearing more about your Dynojet A/F monitor? How does it hook up? Have you compared the readings with a Dyno? I wonder how accurate it is? TIA.
Hey Mark;
http://www.widebandcommander.com/
Go to the Dyno jet website and it will tell you more but here is the deal.
I took it off my wifes formerly ATI Procharged supercharged 350Z
It has a Bosch LSU4 wideband O2 sensor that feeds it the A/F info.The sensor is mounted on the big collector thingie under the gas tank on the left side; it turned out cleaner than I thought it would as far as installing a bung and sensor. Not sure where I will put it when I finally get an aftermarket exhaust.
The guage is a 2 1/16" guage that I cup mounted on the bike.
It also has inputs for RPM, Vacuum/Boost, throttle position and any other 0-5 volt sensor input that can be user named and programmed. I haven't found a 0-5 volt sending unit yet to use for acquirring throttle postion info; if I ever go F/I ($$$$$$$) I will pursue that but not for now....
It requires a laptop in order to program it. If all you are using is the A/F portion no programming is required unless you want to use the warning light on the guage to indicate overly lean conditions and I would not do that unless I did use the other features to allow programming to rule out an unneeded lean condition warning light under light throttle, low rpm situaitons. A laptop IS needed to playback any data-logged information...
The brain is identical in size to a Dynojet power commander and is mounted under the seat where the tool kit used to be.
All of the inputs can be data-logged for up to 10 minutes when a datalogging switch is turned on. The A/F is the only one that can be viewed at all times. the rest require a laptop to view, and they can either be viewed in real time or through the data logged playback feature.
I used a 0-5 volt pressure transducer on the oil system to input oil pressure to see what it is doing while going down the track.
It has various programmable features; one is a warning light led on the guage itself that I programmed to turn on at around 500 rpm before the shift lite (Raptor) comes on; it allows for some anticipation of the main shift lite...
It also has a programmable output that will send a ground to any circuit you choose such as nitrous etc. It can be programmed using any of the inputs parameters I.E. Rpm over XXX. A/F richer that XXX, Throttle position open more than XXXX percent....
I programmed this one to turn on when oil pressure is below 30psi and rpm's are over 3500 in order to serve as a warning lite feature in case of an oil system failure.
I sent this output to an MSD mini-prolite that will catch my attention if the oil pressure meets those parameters.
I hope I never need it.
For those that don't know a Wideband sensor is a 4 or 5 wire sensor that is accurate between 10:1 to 18:1
A normal 2 wire narrow band sensor is actually only able to indicate if the A/F is under 14.7:1 or over 14.7 regardless of how many pretty lites the MFG> puts on the guage, they are actually quite useless for tuning purposes...
As far as accuracy the Bosch is generally recognized as one of the best and just about evey wideband system out there uses that same sensor; when we were tuning my wifes car on a dyno the Dynojet on her car was always very close to what the dynojet chassis dyno with an exhaust sniifer up the tailpipe was telling us.
Rusty McNeil
