legacycentral bbs

yeah ive seen the stuff for the serial and parrallel, i was hoping to make the usb cable. i will search tho

ok so im going to do the td04 with 440's. stage 2 revtronix. but i see everyone talking about this cord. so can you just plug it into my computer and into the ecu and look at settings and change things? or what is the cord for. i saw the cord on the revtronix site.

You can't change anything. It simply allows you to observe certain ECU parameters.

I would only delve into that if you are doing something that is not typical of Stage 2 setups or if you have some problem with the way the car is running.

doesnt it say they will make a program to change certain things later using the cable ?

ericem wrote:doesnt it say they will make a program to change certain things later using the cable ?

Cool..Indeed it does.

Must be combined w/the future 'User Programmable' chip due out?

It's more likely that a user-programmable chip would not interface through the SSM plug, but what do I know.

ScottyS wrote:It's more likely that a user-programmable chip would not interface through the SSM plug, but what do I know.

Good point. Does the SSM accept input when used @ the dealership, or still just for output?

I thought I read somewhere in the FSM that the dealer SSM tool (whatever its fancy name is) could clear CEL codes? If that's the case, then some part of the ECU is writable via SSM...

BSOD2600 wrote:I thought I read somewhere in the FSM that the dealer SSM tool (whatever its fancy name is) could clear CEL codes? If that's the case, then some part of the ECU is writable via SSM...

Maybe. However, the target features of the programmable chip basically preclude the SSM interface....

* Reflash and high-speed datalogging through USB connected to laptop
* Additional PWM output for methanol injection
* External inputs for wideband and up to 4 simultaneous EGTs, maybe extra input for failsafe switch (low oil pressure or methanol level)
* Real-time parameter editing (while engine running)
* Driver switchable maps, similar to our current Staged chips

Got the stage 2 chip, 440cc inj, 06 TMIC, now waiting on silicone hoses and td04!

Finally, a new RevScan with some pretty cool improvements! http://www.revtronix.com/downloads/revscan

Sweet my cable should come on monday I hope. You try it out yet? What outputs can be changed?

Anyone can download it and look what it does w/o the cable. Yea, I briefly tried it last night idling in the driveway. I'm holding off though on any more data logging until my TMIC is fixed.

Although, I was happy to see that there are no learned knock values in the matrix (you'll see what I'm talking about) -- or maybe those matrixes are reset each time the car is powered off. No documentation to hard to say.

Anyone remember how long the ECU took to advance the spark timing after an ECU reset? I'm right at 100 miles and occasionally the spark timing will increase and my AFRs will be acceptable, but then it'll just randomly pull timing after about 5 or 10 minutes and the AFR goes extremely lean.

Whats your octane factor at?

It was still at 75% last time I checked. The car's currently getting painted so I won't be able to check it again until Friday or Saturday.

What are the increments of the octane factor? Can it go up by a single digit or is it by 5% every time or what?

I'm thinking that maybe I'll just pull out the chip and let the ECU learn without it (takes about 15 minutes of driving) and then throw the chip back in once the octane factor gets back up to 100%. Then slowly let the ECU learn around the chip.

asc_up wrote:What are the increments of the octane factor? Can it go up by a single digit or is it by 5% every time or what?

When I was reverse engineering the revscan parameters, I recall that the octane factor / spark learn factor (they renamed it) used the function: x * 6.25. So it's increments would be: 0%, 6.25%, 12.5%, 18.75%, etc.

Without the chip using the USB cable my octane factor on 94 octane is only like 40-55% TOPS. I have seen as low as 24% by logging.

Interesting, but as I recall, your car isn't exactly running top notch (well neither is my SS atm either).

I do know that when I installed the stage 2 v1 chip into my touring wagon, the spark learn factor WAS at 100% after a lot of driving (1000+ miles).

So it took you a long time to get there, hmmm....

Maybe I'll leave it in for a few more days and if it doesn't show any signs of clearing up I'm just going to use the method I suggested above. I'll let you guys know.

Anyone running one of these at elevation? I'm at ~5000ft. I think I'm going to get the stage 2 chip and run that with my turbo and injectors for a while, should keep me happy while I finalized my plans for swapping the heads.

checked my octane factor today again and it was nice and cold and raining and its at 100%.

still wanting to see actual dyno graphs...

anyone running stock bcs? or people running the chip with the manual booster controller?

which is better?

I've used both.

Initially started with the Hallman MBC and used that for thousands of miles. While it works well, if you have things adjusted close to the new fuel cut, then as the temperature/seasons change, it moves the relative boost levels around. This of course can cause fuel cut (revtronix chip reduced the overboost fuel cut time from 3 to 1.5 seconds). Several hundred miles ago, I switched back to the stock BCS. Assuming you don't have any vaccum/boost leaks, it works well and learns how to quickly reach the target boost with a few hundred miles.