R/T Hemi Predator Tune Install and Dyno Tune - Dodge Challenger Forum: Challenger & SRT8 Forums
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Old 01-02-2011, 11:50 AM
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R/T Hemi Predator Tune Install and Dyno Tune

Not an expert at all, but wanted to share my Predator and dyno testing.

My R/T 5.7 Hemi with 6 speed and 3.92 gears has the following engine mods: Cervini shaker hood & scoop with the Cervini CAI using large K&N filter; SRT8 air intake tube; 180 Razor T-stat; Moroso catch-can.

Last week I took my Cuda (2009 Challenger) to a dyno tuner on a Mustang dyno (always smaller numbers than Dyno Jet, etc) - short version of the results are that we ran with an ambient temp of 60-65 degrees F were:

BASELINE dyno pulls - 317rwhp/338rwtq; power band readings erratic and AFR very rich;

PREDATOR tune dyno pulls - installed Predator 93 octane CAI tune and dyno pulls were: 313rwhp/332rwtq - loss of peak power, BUT the power band came up quicker and smooter across the entire band, but AFR still too rich;Predator canned tune also reset my fan speeds to 199 MID/HI and 190 LOW which was good for my 180 degree T-stat;

DYNO tuning pulls- after numerous adjustments to timing, AFR, and parameters and several dyno, pulls the best power we produced was 324rwhp/342rwtq - this was with after adjustments to lean out the AFR and with engine temp at 190-195 degrees and a timing adjustment of 1 degree above the Predator canned tune; engine also ran well with a timing adjustment of 2 degrees above Predator canned tune, but had some "knocking" at high rpms;

ENGINE TEMP. & EXHAUST RESTRICTIONS - we noted on our runs that when engine temp got above 200 degrees we lost 10rwhp; we also noted that on the best dyno pulls (324rwhp/342rwtq, etc) the engine rwhp flattened out about 5300 rpm but did not drop off until about 5700 rpm - my dyno tuner suggests that the R/T log type manifolds and smaller exhaust system (2.5 inch) are really restricting the engine and that with headers and cat-back exhaust I would probably pick up 15-20rwhp on the "Mustang dyno" !

DRIVING RESULTS - about 500 miles ago I did the #2 Fuse pull trick and got some great "seat of the pants" feel results on throttle response and low end power; after the dyno tune the "seat of the pants" results not as noticeable, BUT the power band comes up quicker and is much smoother through all of the gears (1-4) and feels great car drives and accelerates great.

Predator canned tune really helped bring up the power band quicker and smooth out all readings across the power band - BUT, if I had not coupled the Predator tune with dyno tuning I would have lost 4rwhp/6rwtq of "peak power" - with dyno tune I picked up "peak power" of 7rwhp/4rwtq above my Baseline run and 11rwhp/10rwtq above the Predator tune run - and I now have my stock tune stored in the Predator and datalog info from our current dyno tuning - and I know where the engine is now to help make my future performance mod decisions - SO COUPLE THE PREDATOR WITH A DYNO TUNE IF YOU CAN !!

So for me, I was happy with the $290 for Predator and the $350 for dyno tuning runs. Again, not an expert and not looking for criticism just wanted to share and maybe it will assist another member.

Thanks folks for all the info I get from this forum !!

gljplc
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Old 01-02-2011, 01:31 PM
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Ok i'll say it, thanks for the info. i think the butt dyno confirms your post.
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Old 01-02-2011, 02:31 PM
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Good post and good info. I just have to say your "Cuda" looks freakin' sweet!
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Old 01-02-2011, 02:46 PM
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Originally Posted by thomasgf View Post
Good post and good info. I just have to say your "Cuda" looks freakin' sweet!
I agree!


gljplc;
Pretty cool testing you did, I've never seen what my car did without a tune. I've also only made one pull on a mustang dyno, at the time I only had the 91oct tune and my mbrp catback. It resulted in 335rwhp in 85F+.

After that, I installed shortys and catless mids and then got a dyno tune from SHR (whom has a dyno that reads just as low or lower than a mustang dyno). With the shortys, catless mids, tune, & mbrp it put down 341rwhp&359rwtq..after Eddie was done tinkering with it, she pulled 358rwhp&384rwtq.

So I would have to agree, its best to get a custom tune if you have the chance.
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Old 01-02-2011, 02:49 PM
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X3, would love to see more pics of your ride.
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Old 01-02-2011, 03:37 PM
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CHRIS 1992 thanks for sharing that info as your Mods are exactly the Mods that I am looking at next for my Cuda and your dyno results are just about exactly what my Mustang dyno tune guy and I calculated that they would be with those Mods !! That's why these forums produce great info !!

GOEHNER - thanks for the compliment - this morning I posted an album of my Cuda photos on this forum - should not be hard to find.

gljplc
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Old 01-02-2011, 03:44 PM
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Chris1992 - That's Lake Buhlow behind me in my photo - not far from you. Where is SHR and your tuner Eddie ??? Send me a PM please. Thanks again, gjlplc
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Old 01-02-2011, 07:24 PM
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Thanks for posting the comparison!

ART is close to me in Buda. They specialize in Hemi and Vipers. Will contact them about custom tune pricing.
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Old 01-02-2011, 07:32 PM
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gljplc, you're in our area. Buhlow lake is where our club held it's first anniversary BBQ. Are you at Camp B?

Jack
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Old 01-02-2011, 07:44 PM
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Over in Alex Jack09 !! When's your next meeting ??? Do you know where SRH and Eddie the dyno tuner that Chris1992 spoke of are located ?? Send me a PM. Thanks again. gljplc
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