How large is the correction factor for fuel and timing that you have created?

How often/fast do the knock and o2 sensor read? And how does that speed work in conjunction with the processor, and the time it takes to actually make an adjustment? And just curious how would one go about injector scaling? or will this SMART basically cover it because of the drastically changed o2 values (hence the question about how much correction SMART will really make.

Also, does SMART use a memory system to self learn over time the best fuel and timing values? or does it just make the best of what it can when it can? Like say if you did put in larger injectors and just waited for SMART to compensate for them, would it recompensate everytime you started the car or would it learn over time to keep the fuel values how they are after running the car?

I would have just read, but I dont have time to read 30 pages....

Thanks,

Eve-slow's brother.

EDIT: I apologize for bringing back a dead thread, but since I already did, can you answer the question still.

Thanks again

 

Well, if you did take the time to read, those exact questions were covered, but I'll answer for you anyway...

The Xede samples at over 100 samples per second and makes changes on the fly. The SMART system does not retain anything it learns, it simply adjusts as it goes. The changes are very rapid and almost instantaneous. The SMART will only correct within it's "Authority Range" which is essentially a +/- tolerance that the Xede needs to stay within no matter what.

So for an example (this is just an example, numbers are just thrown out there), if your car on pump gas map, can run 20 degrees of timing, and the base map that your Xede has stored runs 20 degrees of timing, you will get optimum power output. The SMART system may only have an authority range of +/- 5 degrees of timing. Lets say you then put in race gas, but left your pump map in. With the race gas you could run, say 30 degrees of timing safely. The SMART will realize you have no knock and bump up the timing, but it will only go to 25 degrees, because that's the limit of it's authority range. Now you're still getting more power than you would have without SMART, but you're not getting the most power you could like if you were running a race gas base map.

This could, and would likely relate to your injector scaling. If you go so much bigger on the injectors, you might reach the adjustment limit before you actually hit your target AFR. That all depends on the authority range for fueling adjustments, and I simply don't know what that is.

Furthermore, even if it could adjust for bigger injectors, you shouldn't use the Xede for that... why you might ask? When the Xede has to alter the MAF reading to such a huge degree to compensate for injectors, you end up with massively altered timing outputs since the two are interrelated. Yes, the SMART Xede will then use the knock signal to readjust timing, but you're essentially asking the Xede to do a lot more work than it needs to. The best way to run larger injectors is to have your ECU rescaled for the larger injectors, and then let the Xede do the fine tuning.

HTH

- Steve

 

Ecu rescaling=reflashing to compensate for the injectors? Just making sure....

Scorke

 

Correct

 

Thanks SuperHatch

 

Welcome

 

I just read the first 20 pages and got tired so i skipped to the last 2 pages. This seems pretty interesting too bad im broke. Since everything will be corrected as you go, shouldnt gas mileage be improved also if you are driving conservatively?

 

Read all the pages like the rest of us.