2019 Challenger Widebooty HellKitty

motorheadmike

motorheadmike

Geezer
Nov 18, 2009
5,088
113
Ottawa, Ontario Canada
Spent a good chunk of time getting HPTuners logging the HellKitty properly. Big learning curve figuring out which sensors do what to produce viable data on this platform - especially considering it is about a 10000:1 ratio of LS-threads to HEMI-threads talking about tuning/scanning. Demographically speaking it isn't a surprise as the vast majority of HC owners are completely hands-off.

Couple of interesting things here:

1. IAT B1S3 is showing the aftercooler/pre-intake valve temp - this is where a little post blower alky injection is going to come in handy (and a couple of alcohol/water intercooler sprayers);
2. The twin WB02s show Lambda at 1 outside of PE, the fuel trims reflect the known alcohol content (10%). Perfect. However, it is interesting that the calculated (not measured) alcohol percentage is still 0%. This is accounted for in the tune from the factory as stoich is ~13.5:1. This is why Lambda is a better indication of air fuel ratio as it focuses on oxygen not fuel composition. Down the line I plan on pressing this closer to 30% measured alcohol content, and it should be calculated as 20%;
3. Zero knock. Good pump fuel, moderate factory timing; and
4. All the boost (11.4-11.6 psi) is factory normal, and supporting calculated airmass (is really good).

1590154453023.png


This graph is using airmass (in grams) x 1.1 as a constant for a supercharged application (turbo and NA is 1.25) to produce the power calculations:

1590154469502.png


It isn't a perfect model, but if the airmass is there, and this is a Closed Loop system, the fuel will follow = Moar Powa Baby!

1590154481572.png
 
1 RARE T

1 RARE T

Greasemonkey
Jul 14, 2015
165
43
Considering you probably did this on a nice (still) cool day, that IAT temp sure seems high. What happens on a hot summer day? Yikes.

Obviously that's what the future alky spray is for. I would guess you can trim fuel if you're spraying or do these things like more?
 
motorheadmike

motorheadmike

Geezer
Nov 18, 2009
5,088
113
Ottawa, Ontario Canada
Considering you probably did this on a nice (still) cool day, that IAT temp sure seems high. What happens on a hot summer day? Yikes.

Obviously that's what the future alky spray is for. I would guess you can trim fuel if you're spraying or do these things like more?
The air temp was about 77*F, so yes it is ugly. From what I logged it didn't pull any timing due to IAT. So it is all well and good for now.

And because this is a Closed Loop Lambda based system it will auto-compensate for the difference once the alky happens.
 
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motorheadmike

motorheadmike

Geezer
Nov 18, 2009
5,088
113
Ottawa, Ontario Canada
On to the next project. I've been sitting on this one for about 6 months since first learning about it, like anything I just needed time to focus on it.

AlfaOBD!


Long story short it is a scan/diagnostic tool that also allows you to modify your BCM and turn on features that may be limited to other trims. Really interesting stuff. A bunch of us HellKitty guys are looking to copy the settings from a Demon BCM into the standard HC and take advantage of those suspension settings. Wild stuff.

The attached ZIP file has the engine, suspension, and BCM reads from my car. So much info. Enjoy!
 

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Supercharged111

G-Body Guru
Oct 25, 2019
595
93
Geez, 162 and it's already in the red? My friend's CTSV's IAT2 which is post intercooler was about 180 when not in boost. When he did a pull to 120 it shot up to 270. He'd been complaining that it drops boost around 100. That's where he hit 250 as I went back through the data. The Dodge must have a better setup stock. Then again, he's pullied to Hell and back. We'll resume when he gets a bigger heat exchanger installed. Just know your IATs could be much, much worse. I went through all that back in Japan myself. Eventually went with a front mount for my roots blower. That worked excellent, but not feasible here.
 
motorheadmike

motorheadmike

Geezer
Nov 18, 2009
5,088
113
Ottawa, Ontario Canada
Geez, 162 and it's already in the red? My friend's CTSV's IAT2 which is post intercooler was about 180 when not in boost. When he did a pull to 120 it shot up to 270. He'd been complaining that it drops boost around 100. That's where he hit 250 as I went back through the data. The Dodge must have a better setup stock. Then again, he's pullied to Hell and back. We'll resume when he gets a bigger heat exchanger installed. Just know your IATs could be much, much worse. I went through all that back in Japan myself. Eventually went with a front mount for my roots blower. That worked excellent, but not feasible here.
160something is just where I set the warning in HP Tuners, that isn't FCA's doing. Seems high to me - LOL. The Hellcats have one of the best Low Temp Radiator (LTR) on the market because it is fully divorced.

There is lots of real estate in the front of a HC for larger charge coolers.
 
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