Difference between revisions of "Electronics"

Revision as of 14:28, 17 November 2011

Battery

Currently a stockish battery (?). What are good options here? Odyssey makes several options, but there has to be better nowadays.

What does the current battery weigh?

Likely choice:

• Braille B106: AGM, 6.9 lb, 10 Amp/Hr, 210 CCA, 527 PCA, http://www.amazon.com/Braille-Battery-B106-Lightweight-Racing/dp/B004DDI12O 140$+FS]
• B106 Mount: Aluminum, 55$+FS

Others:

• Mueller MotorWerks EVO2: Lithium, 3 lb, 28 Ah, 550CCA, 269$ -- Looks like potentially a really good option. How is it so cheap for so effective a LiIon battery? Something has to be fishy. Try to read up more on it...
• GRRReen 20Ah: Lithium, 7.25 lb, 20Ah, 330CCA, 289$

Ridiculously expensive but awesome:

• Braille ML9C: Li-Ion, 3.7 lb, 36 Amp/Hr, 612 PCA, 950$
• Braille ML14C: Li-Ion, 4.5 lb, 42 Amp/Hr, 773 PCA / 548 CA, 1250$
• Voltphreaks VPH300: Lithium, 2.75 lbs, 340 CA, 140 CCA, 7Ah, 789$
• Voltphreaks VPH450: Lithium, 3.75 lbs, 500 CA, 200 CCA, 9Ah, 929$
• Voltphreaks VPH750: Lithium, 5.5 lbs, 650 CA, 260 CCA, 16Ah, 1300$

NASIOC Battery Post with a bunch of other misc batteries.

Need to buy a trickle charger too.

Does it make sense to weigh the battery cable that runs along the PPF? With a tiny lightweight battery like this, it might make more weight sense to put the battery up nearer/in the engine bay and drop the 10 feet of thick copper cable.

There's a rumor that the Deka ETX9 is the same battery as the Braille B106 (that the Braille is a rebadged Deka). The cranking specs are quite a bit different, but the ETX9 is ~55$ and the weight is the same. Some people on Miata.net have run them successfully, but I'm skeptical. Maybe start with the B106 and if it dies too quickly just get Dekas to replace them?

Engine Management

Bought a MegasquirtPnP. It only supports batch fire injection and wasted spark ignition, but that should be fine for us for a while or possibly forever. I'll eventually need to buy a KnockSenseMS board for knock control with it, but that can wait until I get the supercharger started.

Wideband

Bought a Zeitronix Zt-3, the same thing I've been using with pretty good success on the KLiata. The MS3 seems to support it just fine.

DAQ/Instrument Panel

Buying an Evo4 + MyChron3 for now. It can read from the MegasquirtPnP (MS1) via RS232. It supports as much data as we want down the road -- can do 12 tire temp inputs, 4 shock pots @ 1000Hz, and our other analog pressure/temperature inputs.

Tire Temps

Opti-Grip seems like a surprisingly affordable package. Would need to figure out how to integrate it into existing datalogging, but it could be neat...