S/C owners: collecting information

[PETERPOOP]

Originally Posted by LtNoogie

Yeah, it's too bad Garm cut his apart. I was going to offer him $80 for it.

Secondly, I found this plastic thingy in the garage that looked like a cross between a french horn and a solid bagpipe. From examininig archealogical sketches, I was able to determine that it was my stock airbox.

let us know your AFR when you get it on!

[cali yaris]

LOL

[LtNoogie]

I actually put so much blue tape over my filter that the car almost stopped running. I had to pull over to give myself a "tune-up". What is totally wierd is that the AFR gauge was a constant 15. I cannot get this car to go rich for the life of me.

[kurokoma-kun]

Originally Posted by LtNoogie

What is totally wierd is that the AFR gauge was a constant 15. I cannot get this car to go rich for the life of me.

Just bizarre Long. It's too bad we all have such different set-ups, makes it much harder to compare notes.

My latest observations: today I spent my first significant time on a major highway since installing the supercharger; drove about 30 minutes each way at constant 60-80 mph. At these speeds I was in boost for much of the time--and every time I hit even 1 psi of boost the AFR immediately went rich (11-12s), and (in due course ) the scangauge showed open loop.

camell, is this what youre saying you wish yours would do?

Same nice performance as usual from the car btw, just different gauge readings from what I've seen on my daily commmute. At those lower typical engine loads and speeds its been going into acceleration induced open loop a lot less often--only at higher boost level (say 5 psi) + throttle position (above 50).

[cali yaris]

Since Blitz only supplies a fuel controller, how would they make the car enter open loop when they want it to? Isn't that a function of the ECU? I'm not technical enough to understand what controls what, exactly.

[eTiMaGo]

as far as we can tell, the fuel controller sends some kind of trigger signal to the ECU to make it go into open loop.

Where it's confusing is that camelll believes in some conditions, there is a small window of time in between the supercharger activating and producing boost, and the ECU actually going into open loop mode and thus providing enough fuel. So, in that small window, there would actually be a lean condition of not enough fuel to go with the increased mass of air.

Unfortunately like Garm mentioned, the activation time of open loop depends entirely on the ECU, it's unlikely the blitz controller can speed this up in any way...

[kurokoma-kun]

Q: could Blitz possibly increase this kit's amount of AWESOME???

A: after autocrossing it yesterday, I'm gonna say this adjustment is not necessary



Not to make light of anyone's concerns, I'm just enjoying the hell out of the supercharger, with tinkering being approximately 33.3% of the fun.

[LtNoogie]

Originally Posted by kurokoma-kun

Q: could Blitz possibly increase this kit's amount of AWESOME???

A: after autocrossing it yesterday, I'm gonna say this adjustment is not necessary

KK, please post another thread in the Racing forum about the autocrossing. I can't wait to read what you think about the response, especially coming out of a turn.

[eTiMaGo]

that's right, make us atmospherically-challenged folks even more jealous, you evil woman

[kurokoma-kun]

oh you hurt my feelinks

Not to nitpick, but you used a little "e" in that one word... don't you know by now my title is Mistress of Extraordinary Evil?

[KCALB SIRAY]

off topic

KK, will you make the Nashville Show by chance?

[cali yaris]

to summarize:
from a standstill, open loop takes 5-8 seconds.
if moving (only at freeway speeds?), open loop happens instantly.

Does that sound like the ECU responding differently to the same signal? Or is the fuel controller capable of sending more than one signal to the ECU?

***Is the fuel controller wired into the ECU where it COULD control closed/open loop condition?

[kurokoma-kun]

Originally Posted by cali yaris

***Is the fuel controller wired into the ECU where it COULD control closed/open loop condition?

Three important items the fuel controller is wired to are the accelerator pedal position sensor (VPA terminal on ECM), MAF (VG), and engine rpm sensors (terminal differs by controller model--this is camell's legendary mutant pink wire ), all of which (afaik) are used along with other sensors to determine when to trigger open/closed loop, among other things.

The ECM and fuel controller are obviously intended to act in concert somehow, but as for exactly how data is shared between them seems to be an open question at the moment... the ECM is no doubt still responsible for the actual functions of engine control, but does anyone here know for sure how it is "informed" of conditions by the fuel controller, and vice versa? Or is it only a one-way relationship, ECM --> fuel controller? Blitz must know, so since this thread is supposed to be gathering info for their use, I think we ask these questions only in the hope that they will get some insight into our concerns, if not to try to solve some things on our own.

As for my own car, when AFR goes rich and open loop is triggered does seem to vary according to engine rpm and load as well as throttle positon, at least. I've only noticed the two distinct two states under boost so far--what I guess I could call "town" and "highway"--all I'd like to know is if this is normal? Judging only by my own impressions of performance it certainly feels that way but based on what camell is asking I

[gwasabi]

I don't know CRAP about supercharged or turbocharged cars or cars in general but if you have a lean reading can't you just upgrade your fuel injectors to put more fuel into the engine? just a thought for all the supercharged guys out there. I don't think modding your intake will matter for that matter because the amount of air you get from a stock intake to a aftermarket intake doesn't really change THAT much to even give you a big difference (Unless you have the 1zz TB). Theoretically, the bigger pipe means more air but it still have to go through what ever TB size you have, an am intake only changed the rate at how fast the air gets to the TB from the intake inlet.... Thus the really little increase in horsepower(honestly like 1hp if anything). As far as CAI goes, it's generally the same as a regular intake except theoretically your putting in colder air since its from the bottom but honestly in my opinion on a hot day, you'll actually be sucking in much hotter air because the asphault would be hotter and all....

[Nexus1155]

Yeah, you can add another injector but if you look at it like this. You have 4 injectors firing already and it reads a rich condition, it lowers injector latency to an adequate level to meet the stoich condition. Now if you just add an extra injector not hooked up to the ecu, the O2 sensor will still see it from the readings and even still adjust it. Or atleast thats what I am assuming as it reads off the O2 sensor?

And about it taking way too long to enter open loop from a standstill vs. on the highway, you have to understand that there is alot of criteria it has to meet before it triggers open loop. The main reason it probably comes on quick on the highway is probably that the engine is already under a susbstantial amount of load etc etc

[gwasabi]

Well, I've been reading peter's and noog's post about how they are getting lean condition and I just thought about the idea since I've been reading around and no one really bothered to upgrade their injectors lol just my 2 cents

[LtNoogie]

Originally Posted by gwasabi

Well, I've been reading peter's and noog's post about how they are getting lean condition and I just thought about the idea since I've been reading around and no one really bothered to upgrade their injectors lol just my 2 cents

I picked up a set of four used tC injectors at lunchtime today.

They'll go on Friday. That'll give me a day and a half before I have to autox with them on Sunday.

[Nexus1155]

well yeah if you put in larger injectors you might be able to fool the ecu a bit like the TC ones, its worth a shot. If it still thinks the yaris injectors are in there it will be dumping more fuel than necessary and confuse the ecu hopefully not triggering a CEL