wideband with unichip?

[jestermsp]

i have read some stories of people getting pretty lean with the unichip on high boost. just wanted to know your opinions on if i really need a wideband with the unichip?

[msfamilia]

I have just finished my observation on the UC with my AEM WB02.

I have realized that the UC actually do allow the car to run on a decent A/F ratio when in boost.

However, the rich mixture comes in a little late.

So meaning when you are trying to build up boost slowly with gentle throttle, it would still be wondering at around 13-15 A/F ratio compare to 11-12.5 A/F ratio when you go WOT all at once.

[jestermsp]

so the 13-15 AFR is only out of boost? thats not to bad. its safe to be that lean out of boost right?

[terbow]

out of boost u want 14.7 which is stoich, so yes thats fine.

[msfamilia]

sometimes even in boost, it doesn't get too rich until it passes 4k rpm.

I wonder if it's normal.......

[MrDiggler]

sometimes even in boost, it doesn't get too rich until it passes 4k rpm.

I wonder if it's normal.......

That sounds a lot like the behavior I'm seeing from my stock ECU. Under steady moderate throttle and less than 6 psi it will lean out on me. I get a nasty hesitation right before 4k rpm if it happens just right...probably serious detonation happening. It almost kills the engine. I'm hoping I can tune this out on the new motor.

[JDM Sam]

welcome to the flaw of trying to tune around the stock ecu.

[UnNaturalinc]

I posted this in the EMS section and got no response. Actually, I think I posted it on www.studiosp.net/unichip too.

I was running something like 15:1 up to 4,200rpm and it'd drop down to 12:1. This was pretty consistant w/ about 5 runs.

[spacemonkey]

I never went lean at high boost or WOT. I went lean at partial throttle when the ECU was suppose to be in close loop.


That sounds a lot like the behavior I'm seeing from my stock ECU. Under steady moderate throttle and less than 6 psi it will lean out on me. I get a nasty hesitation right before 4k rpm if it happens just right...probably serious detonation happening. It almost kills the engine. I'm hoping I can tune this out on the new motor.

my stock ECU is perfect....14.7 across the board at low load or partial throttle. And at WOT its pretty damn rich

what you are decribing is what happened to me with unichip on MAp A. My stock ECU runs perfect.

the hesitation I thought was the ECU pulling timming because it was detonating. :dunno: im waiting to hear form unichip on the problem.

[spacemonkey]

I posted this in the EMS section and got no response. Actually, I think I posted it on www.studiosp.net/unichip (http://www.studiosp.net/unichip) too.

I was running something like 15:1 up to 4,200rpm and it'd drop down to 12:1. This was pretty consistant w/ about 5 runs.
thats one hell of a tune. I wish mine did that. 15.1 isnt bad at partial load. and 12.1 full throttle is the max...thats a great tune. Now I see why you made so much power.

who tuned your unichip?

[UnNaturalinc]

That's way too lean... I made peak torque when during the leanest AFR.

Don't forget my car is the car Unichip built these on. It was setup on my car as a model.

*I get up near 16 a couple times on second look.

[spacemonkey]

That's way too lean... I made peak torque when during the leanest AFR.

Don't forget my car is the car Unichip built these on. It was setup on my car as a model.

*I get up near 16 a couple times on second look.

12.1 is way too lean?

According to Juan and most tuners... that is the absolute max you can run on a turbo car at WOT. right? 13s A/F is the max if youre NA. Anything higher then 12.1 is too lean. Closer to 12.1 you get the more HP you make. just that most people dont tune 12.1 becuase if you have somethign wrong like a boost spike or go to a more humid hotter place....its more dangerous. so most factory tune that isnt for racing like to get around 11s at WOT.

I remember that Juan brought the Mazda 3 back to the dyno to get the A/F closer to 12.1 (max) and thats when he broke the 500 hp mark.

16s maybe too lean if your in partial throttle. But nothing like mine...I was seeing 19s. and im happy my electrodes didnt melt away.

[UnNaturalinc]

I always hear 11's are where you want to be.

Again... I make peak torque where my car is running at it's leanest point. It's not at 12.1 or even close to that when I peak. It's like 15.5 at 190ft/lbs

[ChopstickHero]

how much more tuning potential can i get out of my Unichip over the base map (I only use Map A) when if I go visit a Unichip tuner? I don't have a wideband yet, but i don't have any problems with the car at all. It is running great. I'm more curious as to how much whp i'm making.

[UnNaturalinc]

In all reality, the amount of power you could gain is probably not worth it for the tune labor time you'd be spending. Then again, that's probably a better bang for your buck than an intake would be. :)

Is there a Unichip tuner anywhere near you? Find out what their labor rate for tuning is.

Refresh my memory... Map A is the non-stock map, right?

[ChopstickHero]

In all reality, the amount of power you could gain is probably not worth it for the tune labor time you'd be spending. Then again, that's probably a better bang for your buck than an intake would be. :)

Is there a Unichip tuner anywhere near you? Find out what their labor rate for tuning is.

Refresh my memory... Map A is the non-stock map, right?

yeah, there is one in Pomona, which isn't too far from me. Map A is the non-aggressive one. I'm running Map A b/c it was stated that Map B advances timing a bit and I should only use it if I use 93 or higher octane (which I don't, only 91 in CA). I believe he quoted me something like $125/hr for dyno and tune. he said usually less than 2 hrs and he can tune it nicely. I thought it was a bit pricey, but he's the only guy that's close to me.

[low_psi]

$125/hr is a good price.

As for MapB, it only adds 1-2* of timing under WOT...

[Titanium-99]

I am around 14:1 - 15afr when not under boost and the min I punch it it stays a constant 10 afr under boost and the boost load doesnt seem to matter it always goes way rich under boost.

[JDM Sam]

$125/hr is a good price.

As for MapB, it only adds 1-2* of timing under WOT...

No it goes up to 4 at WOT at the higher rpm.

[UnNaturalinc]

I'm pretty sure you're suppose to be running MAP A with boost control on. You'd get more power w/ B however.

[UnNaturalinc]

BTW.....

http://www.msprotege.com/forum/showthread.php?p=2435339#post2435339

[msfamilia]

I am around 14:1 - 15afr when not under boost and the min I punch it it stays a constant 10 afr under boost and the boost load doesnt seem to matter it always goes way rich under boost.


That sounds like what my DSM AFC would do when I had it.

Good for highway driving but the car hesitate like crazy when I do mountain driving and on track. Due to the rapid on off throttle i think.

[ND4MSP]

msfamilia - check your pm's please. Thx