XEDE Engine Management System Available Soon!

[Aricjm15]

So, detonation is just as dangerous in this direct injection engine as it is in any other traditional port injection engine.

This is for the most part true, but you have the added cooling effect of the fuel. Yes you would have this to some degree on a normal engine but its not as effective in cooling the combustion chamber as direct injection.
With a standalone though you could almost tune detonation out with just injector timing.

 

[SPEEDGuy]

This is for the most part true, but you have the added cooling effect of the fuel. Yes you would have this to some degree on a normal engine but its not as effective in cooling the combustion chamber as direct injection.
With a standalone though you could almost tune detonation out with just injector timing.

I agree with you, but that wasn't my point. I was just pointing out that we don't have gas engines that operate on a diesel cycle in our cars like some people think, and that our MZR's will detonate like any other port fuel injected engine if you're not careful. This idea that detonation can only occur for a brief period of time towards top center is a fallacy.

 

[redms3gt]

good to know...

 

[StephanieT]

Sorry, to clarify what I'm saying. You're tuning as lean as possible without knocking, then scaling back for a little safety blanket. I'm just wondering whether that '12:1' AFR saftey margin is being applied to the baseline tune.

Correct. The safety margin will be slightly different for every car. There are lots of variables to account for. ie. octane, humidity. etc.. It is best to tune for knock and fuel at the same time. There are two ways to get rid of knock - add more fuel or retard timing more.

If I'm remembering DI correctly, you can run a leaner mixture. So while 12:1 remains a good reccommendation for standard SI engines, theoretically you're not taking advantage of the DI technology. I'm not a DI expert by any means, I'm just wondering if anything will be approached differently with this engine technology.

We are still new to the DI technology too. Other than adding in the MAF & MAP variable at the same time - we have not experienced any real difference in tuning a DI turbo car. It must have adequate fuel delivery with just enough timing retard. We are treating it like any other car with a forced induction system.
Stephanie

 

[4DRHTRD]

And doesn't the cat alter the AFR reading slightly? So maybe the tail pipe isn't really the true AFR (wink)

I don't have any cats, just straight through baby.
(first)

 

[StephanieT]

And doesn't the cat alter the AFR reading slightly? So maybe the tail pipe isn't really the true AFR (wink)

Ken is correct on the correct wideband placement to get a good reading. But yes, the tailpipe will read differently than right out of the turbo. We have hooked up widebands post-turbo, pre-cat, post cat, and tailpipe. They typically read within a +/- 0.5 of each other. Well within a safety /tolerance range.
Stephanie

 

[aroz27]

Stephanie,

Sounds like you guys will have a hit with the XEDE setup. Put my in line for the speed6 release.

4DRHTRD,

Beautiful car!

 

[BSTD3]

Any updates on the PNP Xede? Might have to get me one of these so I'll be reayd for install when my Speed3 arrives.

 

[Captain KRM P5]

Any updates on the PNP Xede? Might have to get me one of these so I'll be reayd for install when my Speed3 arrives.

harnesses are being worked on by BEGi, i'll check with them for an update

 

[BSTD3]

Thanks Capitan!

 

[GDorris]

Stephanie, now that Compact Car is reporting a 20 hp increase with just the air box cover off (which is how the BEGI Exede dyno run was made), will BEGI be offering a dyno graph and hp increases of the Exede only, without the effect of airbox removal? Seems like the right thing to do.

 

[Captain KRM P5]

Stephanie, now that Compact Car is reporting a 20 hp increase with just the air box cover off (which is how the BEGI Exede dyno run was made), will BEGI be offering a dyno graph and hp increases of the Exede only, without the effect of airbox removal? Seems like the right thing to do.

we did a dyno of the car down in hawaii with the stock airbox fully intact, i'll try and make time to post it tonight

 

[desperado-c]

we did a dyno of the car down in hawaii with the stock airbox fully intact, i'll try and make time to post it tonight

What, we have to wait for the post to get the figures? You, sir, are a big tease!

 

[Captain KRM P5]

What, we have to wait for the post to get the figures? You, sir, are a big tease!

ha ha sorry - with the air box cover on we dynoed at 277whp and 302 lb/ft tq. i am surprised playing around with the stock airbox like that has not caused a CEL code.

 

[desperado-c]

ha ha sorry - with the air box cover on we dynoed at 277whp and 302 lb/ft tq. i am surprised playing around with the stock airbox like that has not caused a CEL code.

Thanks for the chart, Captain. That's a LOT of power. Nutari posted some more elsewhere and says regarding the baseline: "i lost the file. Base run was about 240whp and 260~tq." So, looking at "about" a 35whp/40tq gain, with the stock airbox on. Stephanie posted elsewhere that their baseline dyno was "... 240 hp ... with the Air Box lid off [and] ... 231 hp ... with the lid on." So, it looks like taking the air box out of the equation yields about 10 hp. It'll be interesting to see what adding a CAI into the mix does.

Yeah, I wondered about the CEL with no airbox, too. If it doesn't light a CEL when running with no restriction, when would it ever?

 

[Refonbass]

So that 277whp and 302wtq are with the xede and the ETS TMIC?
Or is that the xede on an otherwise bone stock car?

 

[Captain KRM P5]

So that 277whp and 302wtq are with the xede and the ETS TMIC?
Or is that the xede on an otherwise bone stock car?

XEDE and ETS. intercooler alone showed about 10whp gain to stock car as it was dynoed and XEDE alone showed 271whp gain. keep in mind these dynos were done back to back and also done in a climate 40 degrees warmer than when the BEGi dynos were done. to see if climate, etc really is a factor, we are scheduling a dyno for our customer up near Rhode Island who has the XEDE now and a TMIC on order.

 

[dread]

don't you correct for temperature in your dyno's

 

[MadOzodi]

Oh god, I need to file my taxes EARLY!!! Best bang for the buck would be the XEDE (PnP preferred in my case), then CAI, then TMIC if all parts were obtained separately? I'm hoping for a series of dyno runs showing what each part yields when those mods are installed in that order.

Assuming 15% drivetrain loss, that's like 320hp at the crank?

 

[StephanieT]

Stephanie, now that Compact Car is reporting a 20 hp increase with just the air box cover off (which is how the BEGI Exede dyno run was made), will BEGI be offering a dyno graph and hp increases of the Exede only, without the effect of airbox removal? Seems like the right thing to do.

I agree completely. We had to remove the lid so the car has some air flow. The cover for the IC also came off so we could place fans on it. However, I was not there while they were tuning it and I cannot identify which run was what. If I knew, I would be happy to post it.

Next time the car is on the dyno, I can do a few runs with lid on an Xede only.
Stephanie