So, this Saturday (04/19/2014) I took my TrailHawk down to my local performance tuner to get some base HP/TQ numbers before i started adding my mods.
My Jeep had about 6,950 miles on the clock.
Bone stock on 91 octane gas
Then I installed the Volant Power Core Cool Air Intake.
It took about 10-15 mins to install.
Only Volant CAI , Stock exhaust.
You can definitely hear the intake in that video compared to the first video.
even the power curve was different.
Then i went home and installed the Corsa Black Tip 3" Cat back. It took about 3 hours to install and was quite easy to do by myself in my garage. I need to tweak the alignment a bit, but i am very please with the build quality and the fitment.
I re-dyno the vehicle May 10th. I'll get updated numbers then.
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I should have picked up a k&n drop in filter and did a set of runs in between.
Now that would have greatly interested me.
I just have a hard time believing the CAI's perform better than the stock air box/filter setup, but obviously you got some immediate gains from the Volant. I think that has a lot to do with its successful protected box design they've created.
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I don't believe you gained that much torque from just an intake on a normally aspirated engine. I have seen that on turbocharged Subaru AFTER doing a full exhaust (UP- and DOWN- pipes i.e. the pipes taking exhaust to the turbo and finally evacuating them). The 10 hp gain is reasonable but the torque nope...I would love to see it reproduced a few times.
Thank you for the dyno numbers though. With a factory rated output of DOHC 16-valve 5.7-liter V-8, 360 hp, 390 lb-ft your numbers are pretty...bad...But I really do not think it is YOUR car but either the Jeep or the dyno.
On a Subaru (AWD) the drivetrain losses are about 20-25%.
your next mods should be a Billet Tech Oil Catch Can and port/polish your Throttle Body thru fastman and THEN get a Hemifever tune.
That's my plan. I am at same spot you are plus the BT Catch Can. Throttle body next then tune, but sadly, no ryno dyno to get cool printouts like you got.
I agree, somethings off a bit with numbers. It is normal to do 2 dyno runs to repeat numbers to verify no major bad numbers for each power setup run and it looks like you had 1 run each. That's probably the issue with numbers being a bit off. Also, Hemi's are the opposite of most motors. They actually get stronger with heat sink so earlier cold numbers are usually lower than later hot numbers, if nothing else changes.
Thanks for sharing.
Oh, forgot mention. Don't be surprised if your numbers fall. The ECM is going to adjust so the engine runs according to it's baseline program (economy and smoothness generally speaking). If you get a tune do it LAST and get the semi-custom Hemifever tune so it is adjusted for your driving and setup.
Hmmm, Jeep's transmission is not that efficient. I would love to see a 2014 on the dyno and how those numbers compare.
Here's the K&N dyno graphs
the hemi is not a DOHC engine. its a cam in block engine with push rods.
I believe his numbers, you gotta realize he's at altitude and the atmospheric density is less then it would be at sea level. id bank on the trans being more like 25% loss. otherwise his numbers are about where my modded 3.7 sits now