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Old 01-25-2011, 03:30 PM   #1
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Jeep Wrangler 18 dyno pulls for CAI testing

Sunday was a good day screwing around with the dyno proving that any CAI hp claims are BS for sure. The intake claimed 10hp across the board. Haha, maybe 3-5 tops. It will have cooler air from the cowl instead of under a black hood with hot radiator air 1' away. Here is a cut and paste from my site. Hope it works.
Nope, here is a summary and the link. (even the code doesn't work here).
[code]
Condition Avg HP Avg TQ 3SD HP 3SD TQ
stock 140.92 177.49 2.79 3.68
No Horn 142.12 176.69 3.73 6.06
Tire pressure 146.96 181.20 2.07 10.54
No Intake 151.72 183.12 2.46 5.54
Cowl Intake 149.32 185.71 5.57 5.75[/code]



All of the dyno graphs and more info is in this link.


Jeep Wrangler 18 dyno pulls for CAI testing - Trick Tuners Forums

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Old 01-25-2011, 06:21 PM   #2
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Great write up!

Thanks

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Old 01-25-2011, 06:30 PM   #3
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Wow, thats something. Thanks for the post! Nice to see some actual documented proof.
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Old 01-25-2011, 06:30 PM   #4
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very interesting
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Old 01-25-2011, 07:21 PM   #5
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Very nice results on that cowl intake, do you have pictures of that particular setup?
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Old 01-25-2011, 07:22 PM   #6
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Originally Posted by MikalCarbine View Post
Very nice results on that cowl intake, do you have pictures of that particular setup?

Would a snorkle kit make it worse or about the same a stock?
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Old 01-25-2011, 07:29 PM   #7
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good post... thanks for sharing!
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Old 01-25-2011, 08:20 PM   #8
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Originally Posted by Mike_3303 View Post
Would a snorkle kit make it worse or about the same a stock?
Good question, as it is providing cold fresh air to the engine but the overall length of the intake is increased by OVER 9000!!!!!, I mean, is increased at least 2-3 fold
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Old 01-25-2011, 08:53 PM   #9
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Boy I bet the K&N boys would pay you to shut up! GOOD RESEARCH!
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Old 01-25-2011, 09:17 PM   #10
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did you keep the tire pressure high for the cowl intake tests? which brand cowl?
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Old 01-25-2011, 09:21 PM   #11
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Quote:
Originally Posted by MikalCarbine View Post
Good question, as it is providing cold fresh air to the engine but the overall length of the intake is increased by OVER 9000!!!!!, I mean, is increased at least 2-3 fold
Yeah, I would suspect worse than stock.
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Originally Posted by CapnDean View Post
Boy I bet the K&N boys would pay you to shut up! GOOD RESEARCH!
Yeah, its nice being able to do unbiased tests on vendors products that I don't even sell. To many tests are done by guys getting free products. I paid full price for this and bought it like any other customer. I'm willing to disprove any BS claims with actual data on the dyno. I could be "bought" but it would be really expensive!!! I'm not out to bash vendors at all. This intake is pretty sweet, makes about 1-2hp of having an open TB, and makes MORE torque. But I don't feel much of anything on the butt dyno, but i enjoy the cool sound it makes! Its also step 1 in getting ready to DIY lift the front fenders. Step 2 = find a washer fluid soultion. Step 3= lift the up and stuff 35s on a 2"SL, 1"BL.
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Old 01-25-2011, 10:14 PM   #12
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If I am reading your table correctly the differential is about 9hp, only one short of the cai claim.

Also, do you know if you used the same type of dyno to make the comparisons? Same question with other setup parameters.

From experience I have found it hard to compare numbers without testing to the same parameters.
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Old 01-26-2011, 12:14 AM   #13
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Nice to see actualy numbers and gains at the rear wheels, wonder what the engine actual output is w/o all the loss from the drivetrain.
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Old 01-26-2011, 10:22 AM   #14
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Quote:
Originally Posted by McBear View Post
If I am reading your table correctly the differential is about 9hp, only one short of the cai claim.

Also, do you know if you used the same type of dyno to make the comparisons? Same question with other setup parameters.

From experience I have found it hard to compare numbers without testing to the same parameters.
Thats what I thought, 9HP is not a bad gain.
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Old 01-26-2011, 10:24 AM   #15
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Quote:
Originally Posted by Black98
Nice to see actualy numbers and gains at the rear wheels, wonder what the engine actual output is w/o all the loss from the drivetrain.
From what I've read in the past its about 192hp IIRC
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Old 01-26-2011, 12:33 PM   #16
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Quote:
Originally Posted by McBear View Post
If I am reading your table correctly the differential is about 9hp, only one short of the cai claim.

Also, do you know if you used the same type of dyno to make the comparisons? Same question with other setup parameters.

From experience I have found it hard to compare numbers without testing to the same parameters.
You missed that pumping up the tires from 25-55psi made 4hp. I won't get too deep into statistics, but when you looks at the 3SD values you can see that 3hp is nothing when you are + 5.5hp. For the other statistical gurus, you will notice that a N of 3-5 will mean that the power analysis will be very low on my accuracy of the SD, but its probably in the neighborhood.

The highest stock hp was 142.12 and the lowest was 139.56. With no horn the best was 143.42 and the worst was 140.94 so its safe to say that did nothing significant. The best HP with pumped up tires was 147.59 and the worst was 145.99 so that is slightly significant and should be used as the baseline for all future tests because the tires remained pumped up. The best intake was 151.66 but the worst was 147.24. So when you compare 147.59 from the best tire pressure to 147.24 with the worst intake pull you can say that there is no statistical change.
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Old 01-26-2011, 02:22 PM   #17
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Quote:
Originally Posted by jgorm View Post
You missed that pumping up the tires from 25-55psi made 4hp. I won't get too deep into statistics, but when you looks at the 3SD values you can see that 3hp is nothing when you are + 5.5hp. For the other statistical gurus, you will notice that a N of 3-5 will mean that the power analysis will be very low on my accuracy of the SD, but its probably in the neighborhood.

The highest stock hp was 142.12 and the lowest was 139.56. With no horn the best was 143.42 and the worst was 140.94 so its safe to say that did nothing significant. The best HP with pumped up tires was 147.59 and the worst was 145.99 so that is slightly significant and should be used as the baseline for all future tests because the tires remained pumped up. The best intake was 151.66 but the worst was 147.24. So when you compare 147.59 from the best tire pressure to 147.24 with the worst intake pull you can say that there is no statistical change.
I didn't miss the tire inflation runs.

Looking at your run comments:
  • Pulls 1-5 were done on the stock intake setup
  • Pulls 6-8 were done after removing the stock "horn" on the airbox
  • Pulls 9-12 were done after increasing the tire pressure from 25psi to 55 psi. This was done to try to minimize the wavy torque curves.
  • Pulls 13-14 were done with no intake at all, just an open throttle body with the IAT sensor duct taped 2" above it.
  • Pulls 15-18 were done with the aftermarket intake.
it appears that you only had the tires "pumped" for runs 9-12 which means that the pull 1-5 and pulls 15-18 were done with stock pressures and that is where the 9hp differential came from which is only one from the advertised claim.

My point was, your test has several variables that are not qualified yet you "call BS" on someone's claim on what seems to be 1hp.

Put another way, if YOU were selling the CAI and ran a dyno with STOCK and your CAI and showed a 9hp delta, that is what you would advertise, never mind that, somewhere in the middle of the test you bumped up tire pressure.

That is why I asked the question on type variance of dynos and parameters of your test vs that of the original vendor and their claims.

We moved from a dynojet type of dyno [like Mustang] years ago because they introduce too many variables and went with a dynapack type unit. It keeps the variables to a minimum. Of course it still doesn't answer the question of what type dyno the vendor was using.
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Old 01-26-2011, 03:29 PM   #18
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I didn't miss the tire inflation runs.

Looking at your run comments:
  • Pulls 1-5 were done on the stock intake setup
  • Pulls 6-8 were done after removing the stock "horn" on the airbox
  • Pulls 9-12 were done after increasing the tire pressure from 25psi to 55 psi. This was done to try to minimize the wavy torque curves.
  • Pulls 13-14 were done with no intake at all, just an open throttle body with the IAT sensor duct taped 2" above it.
  • Pulls 15-18 were done with the aftermarket intake.
it appears that you only had the tires "pumped" for runs 9-12 which means that the pull 1-5 and pulls 15-18 were done with stock pressures and that is where the 9hp differential came from which is only one from the advertised claim.

My point was, your test has several variables that are not qualified yet you "call BS" on someone's claim on what seems to be 1hp.

Put another way, if YOU were selling the CAI and ran a dyno with STOCK and your CAI and showed a 9hp delta, that is what you would advertise, never mind that, somewhere in the middle of the test you bumped up tire pressure.

That is why I asked the question on type variance of dynos and parameters of your test vs that of the original vendor and their claims.

We moved from a dynojet type of dyno [like Mustang] years ago because they introduce too many variables and went with a dynapack type unit. It keeps the variables to a minimum. Of course it still doesn't answer the question of what type dyno the vendor was using.
The tires were pumped up for runs 9-18, so the only difference between the aftermarket intake pulls and the ones with the pumped up tires is the absence of the horn. But those pulls compared to the stock pulls, at the same tire pressure, show no hp gains. I'll link the graphs for those too lazy to click the link.




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Old 01-26-2011, 04:03 PM   #19
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The tires were pumped up for runs 9-18, so the only difference between the aftermarket intake pulls and the ones with the pumped up tires is the absence of the horn. But those pulls compared to the stock pulls, at the same tire pressure, show no hp gains. I'll link the graphs for those too lazy to click the link.
yea....if the tire pressure was the same for the high pressure run and the aftermarket intake, i don't see any gains...they're only 3hp/4tq apart, and thats within the standard deviation of both, and both graphs are very noisy, so i don't see any statistically significant difference between the two.
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Old 01-26-2011, 06:35 PM   #20
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That makes more sense. I was going by what you had on bullet 3 in your link which I interpreted as "tires pumped up for those runs only".

Just as another question, why did you not rerun all the pulls with the same tire pressure to eliminate the variable? I know it "shouldn't" make a big difference but each change, including temps at the wheels always make me nervous.
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Old 01-26-2011, 07:44 PM   #21
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Look at that torque curve for the 4.0 so sexy and flat.
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Old 01-26-2011, 08:09 PM   #22
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Look at that torque curve for the 4.0 so sexy and flat.
would be a lot more sexy if it was 75 ft-lbs higher.
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Old 01-27-2011, 10:37 AM   #23
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Just as another question, why did you not rerun all the pulls with the same tire pressure to eliminate the variable? I know it "shouldn't" make a big difference but each change, including temps at the wheels always make me nervous.
Because there was no statistical difference between the pulls with and without the horn at the same tire pressure. Maybe if someone was paying me to run the dyno for 2.5hrs I might have cared a little more. This was a "free test" to finally prove, with data, that CAIs really do make 0 hp on the 4.0L.

The effect they have on IATs is yet to be determined. My approach is to pull timing at different levels that correlate to different IATs. Its too tricky to get a high IAT while in the shop. In the tune, the Ecu can pull up to 7* timing for IAT so I expect the results to be drastic. I have seen IATs of 175+ on the trail, and the jeep will feel like you hooked up a 5000lb trailer to it until it cools down!
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Old 08-01-2013, 02:21 AM   #24
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Wow I guess that not many people really understand how engines work. In order to see gains from increased air flow that air needs someplace to go. I have never seen dyno tests for this on a Jeep but in street performance cars installing a CAI or a turbo may give increases in hp, but unless you increase exhaust flow as well you will never max out the engines performance.

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