Visconti Tuning - Latest BRZ Flash Info

[feldy]

When I Run e85 its mostly for race weekend. I run with it for the week getting out what ever gas was left. fill enough e85 to last two days of racing. Then I just empty it out and re-fill with pump gas. The only fuel starvation issue I had was when I was draining the tank and went to far and got lean codes for running out of e85 fuel. Since I have the fa20club tune I don't have to re-flash for it. Since e85 is on my map 3 and 4.

John pulled that for his guys for safety issues which I agree with. As I have started on the wrong map a few times before. Its scary for sure.
Until more people pull there fuel pumps and see garbage in it. I'm not all that worried.

[Dezoris]

Originally Posted by cobrabyte

Anyone having any fuel cutout issues? I submitted a trouble ticket regarding this but haven't heard anything back...

I am running E85 and yesterday I was running through the gears coming off a stop light. I was in first gear and punched it after I was already going about 5MPH. It climbed nicely through first and I shifted into second. I mash the gas and .. nothing. It's like there was zero fuel getting to the motor. A complete cutout. I let off the gas pedal and the power comes back. Very odd. I didn't squeal the wheels or see a TC light (TC was off anyways).

In any case, was curious if anyone else was having similar issues. I haven't been able to replicate the issue so, perhaps it was a gremlin.

I have been having this exact issue, however I am supercharged and perrin tuned 93 octane.

Revved through first to 7100, shifted to second mash throttle and complete fuel cut for a milisecond, power comes back very weak with knock shortly after.

Have a log of it as well.

[cobrabyte]

Originally Posted by Dezoris

I have been having this exact issue, however I am supercharged and perrin tuned 93 octane.

Revved through first to 7100, shifted to second mash throttle and complete fuel cut for a milisecond, power comes back very weak with knock shortly after.

Have a log of it as well.

That's pretty much what happened to me. Surprised the hell out of me. Of course, I have not been able to make it happen again while logging. I'd rather get it sorted out before having it crop up at the wrong time (ie. the track). Thanks for sharing!

[Dezoris]

Originally Posted by cobrabyte

That's pretty much what happened to me. Surprised the hell out of me. Of course, I have not been able to make it happen again while logging. I'd rather get it sorted out before having it crop up at the wrong time (ie. the track). Thanks for sharing!

I have had it happen about 3-4 times now. I had it repeat on the same stretch of road. What type of shifting speed and force did you use from 1st to 2nd?

For me I am always conservative, slower shift, clutch floored don't know if that triggers it.

[King Tut]

Originally Posted by Dezoris

I have been having this exact issue, however I am supercharged and perrin tuned 93 octane.

Revved through first to 7100, shifted to second mash throttle and complete fuel cut for a milisecond, power comes back very weak with knock shortly after.

Have a log of it as well.

Can you post it? I haven't ever noticed this on my car. Not sure I would notice it for a milisecond though.

[Dezoris]

Originally Posted by King Tut

Can you post it? I haven't ever noticed this on my car. Not sure I would notice it for a milisecond though.

Looks like a timing issue:

[cobrabyte]

Originally Posted by King Tut

Can you post it? I haven't ever noticed this on my car. Not sure I would notice it for a milisecond though.

My incident was definitely longer than a millisecond. I had to let off the gas pedal and get back on for it to get past the stutter.

[cobrabyte]

Originally Posted by Dezoris

I have had it happen about 3-4 times now. I had it repeat on the same stretch of road. What type of shifting speed and force did you use from 1st to 2nd?

For me I am always conservative, slower shift, clutch floored don't know if that triggers it.

When driving in a spirited manner, I'll hammer shifts home. I'm not one to miss shifts or grind gears. I didn't miss this shift either. It was set perfectly and, as soon as I got on the gas for second gear, the engine fueling/timing cut out. It felt like a parachute had been deployed because my senses were expecting more acceleration.

[feldy]

Quick side topic. How correct is the ecutek afr logs?

[King Tut]

Originally Posted by Dezoris

Looks like a timing issue:

You are right that timing jump from 20 degrees to 1 degree and back to 20 degrees will definitely be felt. Things that bother me are that you are definitely in the 10s in AFR and why is your Knock Learn Value at 5 and 4.6 instead of 0. That Knock Correction of -4.2 when you let off the throttle at 6800 RPM is also interesting. I occasionally get knock when letting off after a 3rd gear pull, but never that high a number.

It is also weird that your accelerator position is showing 100 percent while your throttle position shows 30.2 percent. I don't think I have ever noticed that before.

[King Tut]

Originally Posted by feldy

Quick side topic. How correct is the ecutek afr logs?

I can make a plot of my AEM wideband versus the OEM sensor if you would like.

[Dezoris]

Originally Posted by cobrabyte

My incident was definitely longer than a millisecond. I had to let off the gas pedal and get back on for it to get past the stutter.

It's very similar though, like hitting a brick wall, granted I didnt lift here but in past events I have because its a WTF just happened moment and after the lift it comes back to life.

Originally Posted by King Tut

You are right that timing jump from 20 degrees to 1 degree and back to 20 degrees will definitely be felt. Things that bother me are that you are definitely in the 10s in AFR and why is your Knock Learn Value at 5 and 4.6 instead of 0. That Knock Correction of -4.2 when you let off the throttle at 6800 RPM is also interesting. I occasionally get knock when letting off after a 3rd gear pull, but never that high a number.

I won't even pretend to really know the how or why, but it's easy to see the problem. The knock learn etc. no clue.

[Yruyur]

I guess I have experienced similar on a long sweeping turn where I punched going into second. At the time I thought it was the racerom traction control but now starting to wonder.

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[Carwhisperer]

The cut off in 2nd when you punch it was a symptom before I started having misfiring/seal issues with my injectors. In 1st gear during WOT the car would feel like it lost some pep in it. Then shifting into second it would feel like almost nothing until I let off the throttle and got back on it. Just putting this out there.