No reason other than I was taking it easy during my first initial testing run. Just taking my time, taking the tuning in steps. I was mainly concerned with knocks. I didn't want to get close to the torque peak (probably around 4500 or so) before I really looked at the timing maps.

 

Wise move!!! It sounds like it may have saved some on the tires.

Dennis

 

I will try and get the car back out tonight and take some more video of it motoring down the road.

 

You'll be fine on knocks. Set the datalog to record and wick that bitch up! You'll see where it knocks (if it knocks at all). Remember you have knock retard on this car upto 9* which you can increase if you're really worried. One run won't hurt it. If it feels weird on power let off. If AFR goes too far north, up the fuel.

 

I agree, 5 psi should run ok with stock S4 settings and good gas.

 

Adrew is right......Step on it dude... it's only 5psi. OR are you chicken Mcfly?

 

Great updates Mike!!!

I have to commend you on such a methodical approach to tuning. I’m guessing many on this forum (including myself) are not physically capable of the patience or restraint you have shown. I’m pretty sure I was born without the restraint gene; either that or my left foot is simply heavier than the right. Keep up the great work; there is plenty of time to mortify your passengers with WOT launches & gnarly tire shredding burnouts!!!

 

Apparently you were also born with the dyslexia gene

Dan
'91 928GT S/C 475hp/460lb.ft

 

Apparently so, DOH!

 

Rode with Mike for a bit tonight. The RMT is freaking awesome!
Only scary time was when a sport bike blew past us on the freeway. Knowing Mike's history with sport bikes, my butt grabbed a little bit because I expected him to romp it and blow back past the bike. I steeled my grip fully expecting the power surge as the turbo kicked us back in the seat, but...... Mike just looked at me and grinned really big.
"Next time" he said.

Cannot wait.

 

Get some audio on the tunnel run... and find a stretch of highway with a nice center concrete divider....leave your window open and then hit it... the sound of the turbo spooling ...and bouncing back off of the divider is awesome ..

congrats on a successful install ...

Hey John....I wonder how a GTS would respond to 5lbs of boost ?....

 

I had 6 psi withmy gts and when the 3000k was reached it was like the gates of hell opened up...what a rush. loved every minute of it
andy

 

It was hard laying off that sport bike.

Bumped the timing up quite a bit tonight, still zero knocks. I did take off from a dead stop with John in the car over by his house. Stepped on the gas a bit to spool up the turbo (the increased stall speed in my car really helps this thing spool), launched with about half throttle, and it threw us back in the seat and easily spun the tires. I could floor it from a dead stop before and I would be lucky to get a chirp from the tires. This is a vast improvement.

I forgot the camera on my trip out tonight so no video. Bummer. But, as I was going back under that bridge on my way home, a new mustang was taking the U turn under the same bridge. So he was to my right, going the opposite direction. I wish it wasn't dark so I could have seen his reaction.


After the tuning session tonight, I wound up with a large swath of cells reading +127 towards the lower right of the map. I was giving it much more throttle than last night, but tried to stay away from the WOT switch, and the boost was right at 4 lbs during these partial throttle runs. Most of the cells were green, with a few of them being red-even though both were marked +127. I closed it out and restarted, but didn't get back up into that load/rpm range again.

Also, I stopped autotune a few times at idle, and the O2 sensor would quickly run up to +20 percent and then just lock up and not adjust anymore. It just froze. And the idle was not normal. I had to stop autotune, and re-start, and then stop it again to ge the sensor to start reading again. Everything then seemed normal, with the O2 sensor adjust hovering around -1 to +2. Not sure what caused that.

 

Hi Mike
If you adjust the injector size setting in the Parameters screen slightly smaller # setting, that will fool the LH to open the injectors a little longer so you're not hitting +127 so much. You will need to Autotune again of course, but the adjustments will be slight. Alternatively, just do some data logging and let the SharkPlotter do the work for you.

You are correct that when in Autotune the O2 loop is disabled and defaulted to a mid range setting.

That car sounds like a load of fun :-)

 

Thanks John for all of your help both here and behind the scenes. I will make that adjustment tonight and hit the streets again. I honestly feel like a kid at Christmas every time I fire it up now.