Best Settings for 91, with CAI, Mids, State, and Exhaust?

[azpyroguy]

I have been reading here that the best fuel settings for this particular config on a Challenger SRT8, is to add 5% fuel across RPM range, I also adjusted the fan settings to about 185 degrees since I have a 180 stat.

My dyno on just the 91 canned tune with no changes did not have but about 2hp peak HP increase, and about 1.5lbs of peak torque gain, however I did have gains across the driving range RPM band...

Below is my dyno pass with and without tuning, anyone else got any settings that have worked well for them...

[mikel]

forget the dyno, how does it feel on the street?

[azpyroguy]

forget the dyno, how does it feel on the street?

My butt dyno says I got something....

Previously if I left TC enabled (Full ON) I could get very little if any wheel spin, now I do get a bit better launch with some extra wheel spin and it does not feel like its pulling timing as much. Next if I set TC on "Stage 1", I used to get some wheel spin, but then it would yank back after about 15-20 feet with a tiny bit of sidways, now with the tune its almost like the ECM does not know what to do and just gives up... so I can get sideways enough I have to actually correct it, and wheel spin all the way into 3rd gear....

I have yet to try it in "Full Off" mode.... no place safe to do it, and our lovely local government shut down down both our dragstrips... yes.. Phoenix area is now COMPLETELY without any dragstrip. Actually I can not blame it 100% on Maricopa County Board of Supervisors.... they were responsible for Speedworld closing, but the Indian community where Firebird was located at decided that he was making too much money on his lease, and wanted to take the management of that track internal....

[stealth300c]

one thing I would recommend is setting your fans at 205 that way you are running at proper operating temp which is 203 for the hemi. I have researched that running the engine cooler than that you aren't actually making peak power.

[Mike_Levy]

Your research is wrong. Cooler is better. You can watch power drop as the motor gets hotter, especially the 6.1. They heat soak, they knock, power plummets.

If anything I'd drop the fan temps to 181, 188, 188.

[azpyroguy]

I set the fan temps to around 182, 185, and 187.

I took it on a 500 mile road trip this weekend, and noticed the my operating temps were significantly cooler during in town driving, hanging around 180-185ish, where normally it was shoot up to 210-215 range.

I also noticed that with the 5% increase of fuel at all RPM ranges it has a much better pull in all gears and speed ranges, and exhaust note seems to have dropped about 1 octave...

[Mike_Levy]

Gotta change the mid-speed fan setting. There is no mid-speed fan. The setting should be the same as the high speed.

[notso]

Your research is wrong. Cooler is better. You can watch power drop as the motor gets hotter, especially the 6.1. They heat soak, they knock, power plummets.

If anything I'd drop the fan temps to 181, 188, 188.

those setting are for...ac on? off?

I put my fans speeds down 20 from what is defaulted in the settings. 188 sounds like one of the speeds. think instead of 181 i had 179(?)

[Mike_Levy]

All of them. There should be 3 settings (P A/C Off, N A/C Off and A/C On) IIRC. I always set them all the same. 179 would be too low, because the thermostat wouldn't have opened yet, so theres almost no coolant circulating.

[notso]

All of them. There should be 3 settings (P A/C Off, N A/C Off and A/C On) IIRC. I always set them all the same. 179 would be too low, because the thermostat wouldn't have opened yet, so theres almost no coolant circulating.

would explain why my fan runs forever.

thanks mike

[rayzazoo]

Just out of curiosity, why would we expect a gain with a 91 oct tune if the stock tune is already programmed for 91 oct? From what I've seen there are two main benefits of this tuner on the 392 that really improve measurable performance. The first is increasing the shift point to 6400rpms (improves your 1/4mi), and the second being the improved throttle response with throttle boost, especially, for the autos (daily driveability improvement).

That being said, the tuner is still the best bang for buck improvement on the challenger.

[HEMI08]

Gotta change the mid-speed fan setting. There is no mid-speed fan. The setting should be the same as the high speed.

Actaully there is, most of us just done use it.
LS is both fans on low
MS is the top fan on high speed and the bottom on low
HS is both on high speed.

Once the top fan kicks into high you can't see or hear very well what the bottom fan is doing, but you should be able to hear it kick into high at the HS setting.

NO, I dont use MS either, I just make my LS setting 5-10 deg less than my MS and HS settings. I set my MS and HS the same just like 99 % of everyone else.

Think I'm wrong? reload your tune with like 140 LS, 155 MS and 180 HS in P

Start your car and watch/ listen while monitoring your temps.

If your car is loud like mine you may want to put some reflective tape on a fan blade of each fan and check the RPMs with a hand tach if you have one. or maybe put an amp meter in series...etc. so you get an indication for each fan motor.

Put your temps back where you want them when your done.

Yeah you gotta be bored or snowed in/ rainy weekend to do this.

[Mike_Levy]

Just out of curiosity, why would we expect a gain with a 91 oct tune if the stock tune is already programmed for 91 oct? From what I've seen there are two main benefits of this tuner on the 392 that really improve measurable performance. The first is increasing the shift point to 6400rpms (improves your 1/4mi), and the second being the improved throttle response with throttle boost, especially, for the autos (daily driveability improvement).

That being said, the tuner is still the best bang for buck improvement on the challenger.

There is a gain because the stock tune is very conservative. Raising the shift points only works on the SRT8s. The 5.7 Hemi has a power drop after its peak, so raising the shift points drops it out of its happy zone, and can make the car slower.

[Mike_Levy]

Gotta change the mid-speed fan setting. There is no mid-speed fan. The setting should be the same as the high speed.

Actaully there is, most of us just done use it.
LS is both fans on low
MS is the top fan on high speed and the bottom on low
HS is both on high speed.

Once the top fan kicks into high you can't see or hear very well what the bottom fan is doing, but you should be able to hear it kick into high at the HS setting.

NO, I dont use MS either, I just make my LS setting 5-10 deg less than my MS and HS settings. I set my MS and HS the same just like 99 % of everyone else.

Think I'm wrong? reload your tune with like 140 LS, 155 MS and 180 HS in P

Start your car and watch/ listen while monitoring your temps.

If your car is loud like mine you may want to put some reflective tape on a fan blade of each fan and check the RPMs with a hand tach if you have one. or maybe put an amp meter in series...etc. so you get an indication for each fan motor.

Put your temps back where you want them when your done.

Yeah you gotta be bored or snowed in/ rainy weekend to do this.

I have no idea. They've always said that there was no MS fan. I never tested it, never will.