Dave Robsons Challenger R/T

Dave-R · Post by **Dave-R** » Fri Sep 26, 08 7:16 pm

Can't operate one outboard without the other Ivor. So it is all mapped out on the center carb only and then both outers are added into the mix and played with to maintain mixture under all conditions.

The meter records up to 44 mins worth of data (at 12 samples/second) for downloading to the pc so I should be able to get some different types of runs in.

At the moment I can only record air/fuel and RPM. But you can have 6 inputs showing in total.

I would like to record vacuum as well using a map sensor but to use that I need a constant 5v source from somewhere to power the sensor. I have not figured that out yet. It looks like there there could be a 5v output on the serial interface connector on the meter.

Vacuum would be nice because I would be able to see at what point of richness manifold vacuum ceases to increase. Which will tell be the point at which to stop going rich.
I also want to see what is happening to manifold vacuum under the conditions where I want the power valve to open.

Throttle position would be nice too to help with this but I have no idea how I would go about sorting that one out.

The cool thing about this kit is it can be used on ANY car. You can just clamp the wideband O2 sensor up the tail pipe on cars without cats.

Dave-R · Post by **Dave-R** » Fri Sep 26, 08 7:18 pm

Oh. Cost was $250 delivered to my door but I have spent another $170 getting some other bits delivered to use with it like the RPM converter.

That includes all the software and free downloads etc.

AllKiller · Post by **AllKiller** » Fri Sep 26, 08 8:56 pm

Be interesting to see how it works, and what sort of results you get Dave

Dave-R · Post by **Dave-R** » Sat Sep 27, 08 12:30 pm

I know a couple of people that use it Steve. That is how I ended up with this one because one guy upgraded to the latest version.

http://www.innovatemotorsports.com/

I already had my car well tuned with the normal narrowband type sensor but tuning is much easier with this system. In particular if you have a rich or lean spot at one point on a run or under certain conditions.

Every log you make can be played back in real time. It is sensative enough to clearly show if any one cylinder does not fire (shows up as a sharp lean spike due to the oxygen not being burnt) and is easily calibrated for any fuel, induction type, and even NOS.

Pete · Post by **Pete** » Sat Sep 27, 08 12:33 pm

For throttle I think you would need a potentiometer either fixed to the pedal, or more likely the throttle linkage somehow.

mopar_mark · Post by **mopar_mark** » Sat Sep 27, 08 12:55 pm

Pete wrote:For throttle I think you would need a potentiometer either fixed to the pedal, or more likely the throttle linkage somehow.

Throttle Position Sensors (TPS) but as you say Pete a potentiometer, mine works on 0-5v, zero being off throttle and is postioned on the throttle/blades linkage.

Bit off a poor photo I afraid

AllKiller · Post by **AllKiller** » Sat Sep 27, 08 1:46 pm

Mark, id take that to bed with me too if it was mine

Might look into getting one, where did you get yours Dave ?

TPS 0-5 v is all thats needed, you can also get a little box to trick it into thinking it has WOT earlier....for racing....well you can for the GN so i guess its universal

Matt · Post by **Matt** » Sat Sep 27, 08 1:47 pm

how much power will the MAP sensor draw from its 5V source ? You can use a 7805 regulator IC to give you a constant 5V source rated at up to about 1.5A. Very simple, and costs about 50p

http://www.tkk.fi/Misc/Electronics/circuits/psu_5v.html

http://cpc.farnell.com/SC05404/componen ... cs-l7805cv

be sure to use a good heatsink if you're drawing much current.

AllKiller · Post by **AllKiller** » Sat Sep 27, 08 1:48 pm

The carb would be a pretty good heat sink

Dave-R · Post by **Dave-R** » Sat Sep 27, 08 2:20 pm

Matt wrote:how much power will the MAP sensor draw from its 5V source ? You can use a 7805 regulator IC to give you a constant 5V source rated at up to about 1.5A. Very simple, and costs about 50p

http://www.tkk.fi/Misc/Electronics/circuits/psu_5v.html

http://cpc.farnell.com/SC05404/componen ... cs-l7805cv

be sure to use a good heatsink if you're drawing much current.

They don't draw much current at all Matt and that is a VERY useful link for me THANKS!

The LM-1 meter has 6 inputs as I said. Air/Fuel and RPM are fixed but the other four can be ANY map sensor that uses a 5v source.

Dave-R · Post by **Dave-R** » Thu Oct 02, 08 10:45 am

This is the actual meter I have.

http://www.innovatemotorsports.com/products/lm1.php

A mate has sourced me a vacuum sensor for free.

A throttle position sensor would be ideal because then I would know the point on the graph where the outer carbs open.
But how I would fit one to my six pack I can't quite figure out. Maybe a couple of plastic gears and a pot mounted on the passenger side of the center carb throttle shaft??

Dave-R · Post by **Dave-R** » Thu Oct 02, 08 10:49 am

This is the sort of data you can get from it.

http://www.innovatemotorsports.com/prod ... gworks.php

Dave-R · Post by **Dave-R** » Sat Oct 04, 08 7:22 pm

Back in the garage at long last.

At the same tme as welding in a exhaust bung for the wideband oxygen sensor I also wanted to correct the angle of one of my exhaust cut-outs.

When I made the exhaust I accidently welded one pointing a bit lower than the other. So I just wanted to cut that section out and turn it up slightly. I have little ground clearance as it is and even 3/4-inch more is better. I just have to weld back the pipe from the cut-out to the muffler now but this is enough for today.

Post by **TyreFryer** » Sat Oct 04, 08 7:28 pm

Is it a full moon Dave?

Lovely work on the exhaust by the way.

Dave-R · Post by **Dave-R** » Sat Oct 04, 08 7:31 pm

TyreFryer wrote:Is it a full moon Dave?

Cheeky get.