I don't always tune n/a cars, but when i do, i make sure they belch black smoke
#81
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
Guys My favorite shows back on!!!!
Someone posted a datalog from a FI 2.5 motor TDR did.
![](http://forum.miata.net/vb/attachment.php?attachmentid=179065&d=1388349586)
I believe the worry is so much timing early, yet showing no KR, so now we have Moto saying TDR is desensitizing knock sensors, but TDR says no and sends the latest tunes file to a 3rd part who says there indeed is no change to knock sensitivity,but Moto says it is an incomplete file.
What do you make of it.
Jay (TDR) Is A True Gentleman And A Scholar - MX-5 Miata Forum
Someone posted a datalog from a FI 2.5 motor TDR did.
I believe the worry is so much timing early, yet showing no KR, so now we have Moto saying TDR is desensitizing knock sensors, but TDR says no and sends the latest tunes file to a 3rd part who says there indeed is no change to knock sensitivity,but Moto says it is an incomplete file.
What do you make of it.
Jay (TDR) Is A True Gentleman And A Scholar - MX-5 Miata Forum
#88
Boost Czar
![](/mt2011/images_td/ranks/supporter1.gif)
![](/mt2011/images_td/ranks/admin.png)
iTrader: (62)
Join Date: May 2005
Location: Chantilly, VA
Posts: 79,688
Total Cats: 4,113
#91
Elite Member
iTrader: (12)
Join Date: Jan 2007
Location: Hermosa Beach, CA
Posts: 2,573
Total Cats: 12
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
I know this is delayed, but just wanted to say the reason the AFR is so rich on the stock tune IS to cool the cats. The evaporative cooling of the extra fuel lowers EGTs overall, a 1 point drop is enough for almost 100C drop in EGT.
It bugs me to no end at work coming from race cars, we run the tundra's engine at around 11:1 under power performance just to keep the cats cool.
Honestly you need to be careful, pulling AFR back to 14:1 on a newer car can cause cat over temp pretty easy. If you kept the catalyst temp estimation and compensation maps active through you might be OK, but it would start richening up your tune quickly.
It bugs me to no end at work coming from race cars, we run the tundra's engine at around 11:1 under power performance just to keep the cats cool.
Honestly you need to be careful, pulling AFR back to 14:1 on a newer car can cause cat over temp pretty easy. If you kept the catalyst temp estimation and compensation maps active through you might be OK, but it would start richening up your tune quickly.
Thread
Thread Starter
Forum
Replies
Last Post
FAB
Fab9 Tuning - Miata Performance Parts
0
09-11-2015 12:02 PM
SuperSneakySecretSquirrel
Meet and Greet
5
09-06-2015 08:30 PM
Motorsport-Electronics
ECUs and Tuning
0
09-05-2015 08:02 AM