Hitting fuel cut with AVCR

[2543arvin]

Now I know that most of you will say "No shit, dont turn the boost up so much then", but thats not the case. It will boost to 1.13 bar and then hits fuel cut around 4500 rpm in 3rd gear.

Ive set my boost at 1 bar and the duty cycle is 60%. I am completely new at using an electronic boost controller, so please be nice. When I turn the AVCR off, it will boost to the same level (1.13) and still hit fuel cut but it will come at like 5500 rpm, since the boost is getting higher with higher rpms.

It is like 35* outside so I know that can cause me to hit fuel cut sooner, but is this a problem that I shouldnt worry about since its colder, or is it something I need to address no matter what the temperature is?

My lex AFM screw is adjusted all the way out, so I can raise fuel cut anymore with that. I can post up all my AVCR and SAFC settings if anyone feels that would help.

Thanks
Brandon

 

[GrimJack]

Are you adding fuel or removing fuel with the SAFC?

 

[2543arvin]

Im removing fuel at 5000 rpm until redline.

 

[dbsupra90]

sounds like the problem is the duty cycle. the higher the duty cycle, the sharper the ramp of boost. if it is set too high, you can get boost spike or boost creep. try reducing duty cycle down to around 20% and see if that helps.

also, are you doing the learn gear mode or manual mode?

 

[2543arvin]

sounds like the problem is the duty cycle. the higher the duty cycle, the sharper the ramp of boost. if it is set too high, you can get boost spike or boost creep. try reducing duty cycle down to around 20% and see if that helps.

also, are you doing the learn gear mode or manual mode?

I will try to lower the duty cycle and see what happens.

To be honest with you, not even sure where I set either the learn gear mode or manual mode. If I post my settings up will that help? Im sorry but Im new to the EBC and the shop I used to go to for advice closed down so Im stuck on this one.

 

[dbsupra90]

go into set boost mode, either channel. if the duty cycle appears as **% on the set boost screen, it is in rpm/gear mode.

 

[2543arvin]

go into set boost mode, either channel. if the duty cycle appears as **% on the set boost screen, it is in rpm/gear mode.

Okay then it is in rpm/gear mode and I adjusted the duty cycle to 20%.

 

[2543arvin]

Alright, I gotta mail off a package to Slow66, so I will see if that makes any difference adjusting the duty cycle. I will report back the results.

Thanks dbsupra90!

 

[2543arvin]

Alright, after adjusting the duty cycle to 20% it allowed me to boost 1.1 bar in 3rd gear all the way til redline, but when I shifted to 4th it boosted to 1.2 bar and hit fuel cut at 5500 rpms.

Im kinda stuck on what to do from here. It is colder but I still kinda figured that I could fix this problem.

Any ideas/suggestions?

Thanks,
Brandon

 

[IJ.]

If I'm reading this correctly he's still hitting fuel cut with the AVCR off?

Too much WG spring by the sounds of it for starters.

 

[2543arvin]

If I'm reading this correctly he's still hitting fuel cut with the AVCR off?

Too much WG spring by the sounds of it for starters.

No, I had it off until I figured out what to do, but now its back on and its still hitting fuel cut with the results above.

 

[IJ.]

Now I know that most of you will say "No shit, dont turn the boost up so much then", but thats not the case. It will boost to 1.13 bar and then hits fuel cut around 4500 rpm in 3rd gear.

Ive set my boost at 1 bar and the duty cycle is 60%. I am completely new at using an electronic boost controller, so please be nice. When I turn the AVCR off, it will boost to the same level (1.13) and still hit fuel cut but it will come at like 5500 rpm, since the boost is getting higher with higher rpms.

?

 

[2543arvin]

?

Dont understand your question here.

edit: I think I see what youre confused about. When I say off, I mean under the settings menu it is off. (Not controlling boost) There are three settings......A, B, or OFF. When it was off it was still boosting, just not with the AVCR. I was already boosting around 15 lbs before the AVCR because of the exhaust. When it was on setting A (ON), the duty cycle (60%) was making it overboost.

Now I have the duty cycle set to 20% and it hits fuel cut in 4th gear at 1.2bar at ~5500 rpm. I still dont understand why it boosts past what I have it set to (1 bar). Any help?

 

[IJ.]

Highlighted section...

If it's hitting fuel cut/same boost with the AVCR Off the WG spring is too hard or you have it plumbed wrong.

 

[2543arvin]

Highlighted section...

If it's hitting fuel cut/same boost with the AVCR Off the WG spring is too hard or you have it plumbed wrong.

Im using the stock toyota wastegate, the reason for the boost that high is because of the BIC exhaust. It went from 7 psi to 14-16 psi after I installed the exhaust.

I am positive that I havent hooked it up wrong. The install was way too easy for that and I have even rechecked it.

Is there no hope for the LEX AFM? Am I going to just have to run speed density with this setup to keep from hitting fuel cut?

 

[IJ.]

Sorry have never used a CT or a stock gate but that sounds wrong to me with just an exhaust change.

Ditto on the Lex never went that route and anything you could possibly do to get it around fuel cut is going to have flow on effects in other areas so yes some form of Map would be prefferable.

 

[dbsupra90]

OH!!

that reminds me, thanks IJ

be sure on the solenoid you have it connected to the right ports. the NO goes to the turbo and the COM goes to the wastegate.

you leave the NC open unless you are running an external wastegate.

 

[2543arvin]

OH!!

that reminds me, thanks IJ

be sure on the solenoid you have it connected to the right ports. the NO goes to the turbo and the COM goes to the wastegate.

you leave the NC open unless you are running an external wastegate.

Yep, its all connected correctly.

 

[dbsupra90]

ok, just making sure 100%

what i would do at this point is do a full reinitialization of the unit, then go back and set everything up again in the configuration.

then, set the boost at 1bar, duty at something real low like 10% and see what happens. dont forget there is a record and playback feature on the avcr. its handy to use to see how the boost comes on and if it is overshooting.

 

[IJ.]

Dave: If his base is 1.13 on the WG alone how is he going to make 1 bar?
(If he's reading the AVCR 1.13=16Psi)