3.8L CAI Mod -- Uses stock airbox without any changes!
#11
JK Enthusiast
Intake air temperature: 129.2 vs 113.0 == 16.2 degrees cooler
Intake manifold air temperature: 141.8 vs 127.4 == 14.4 degrees cooler
These data logs are from two full throttle runs, as identical as possible and about 15 minutes apart. The numbers in the upper right corner are data captured at the vertical timeline (5078 and 5028 RPM respectively).
OEM (no baffle)
Attachment 664200
Rubber Baffle CAI mod
Attachment 664201
Cheers
Intake manifold air temperature: 141.8 vs 127.4 == 14.4 degrees cooler
These data logs are from two full throttle runs, as identical as possible and about 15 minutes apart. The numbers in the upper right corner are data captured at the vertical timeline (5078 and 5028 RPM respectively).
OEM (no baffle)
Attachment 664200
Rubber Baffle CAI mod
Attachment 664201
Cheers
#12
JK Enthusiast
I have the AEV snorkel also and feel like I gained nothing, maybe even lost a bit of power. I also tried the viper throttle body mod for a year and only gained an occasional yellow lightning bolt.
So I gave up on performance mods. I'll take weak and reliable over strong and temperamental lol
So I gave up on performance mods. I'll take weak and reliable over strong and temperamental lol
#13
JK Junkie
"Main benefit is reduced knock retard and pinging (detonation) on very hot days, due to cooler air intake temperature"
Thanks for the info and graphs. Keeping the engine breathing cooler air is alaways good for the engine.
Reducing heat soak in the engine compartment will also help your engine last longer. That's why I got a vented hood.
From my tuner car days on my STI. I ran a 3 minute turbo timer just to make sure I was not turning the car off super hot. Some of my non tuner friends at first would tell me I left my car running then I would tell them it's to cool the turbo it's on a timer.
Thanks for the info and graphs. Keeping the engine breathing cooler air is alaways good for the engine.
Reducing heat soak in the engine compartment will also help your engine last longer. That's why I got a vented hood.
From my tuner car days on my STI. I ran a 3 minute turbo timer just to make sure I was not turning the car off super hot. Some of my non tuner friends at first would tell me I left my car running then I would tell them it's to cool the turbo it's on a timer.
#14
JK Jedi Master
It reduced engine, transmission, intake, electronics, and engine bay temperatures, all the time. Also improved A/C performance.
#15
JK Junkie
Thread Starter
PDF Template added to the first post
Thanks for the kind words everyone. I used the original CAI template to make a five page PDF version of it. After printing and taping it together with the match marks, it was dang close to the original and should save anyone wanting to try this project some time.
MRT_CAI_Template.pdf
MRT_CAI_Template.pdf
#16
JK Junkie
Thread Starter
Regarding the snorkel, is the drain in the airbox sealed up?
#18
Actual logs please?
Thanks for the kind words everyone. I used the original CAI template to make a five page PDF version of it. After printing and taping it together with the match marks, it was dang close to the original and should save anyone wanting to try this project some time.
Attachment 664258
Attachment 664258
#19
JK Junkie
Thread Starter
Hi Mr T. I am building one of these today and would be interested in the actual logs you used for the diablo graphs above. Two things are of interest. In the pic without the baffle I see that familiar down step in the temp reading that a wot run brings as the rush of air cools the intake tube. I don't see that in the pic with the baffle which could mean that the tube was not hot to begin with but I can't see your starting intake temps. Was the jeep properly warm (heat soaked) both runs? This is a fantastic idea and together with a clean OEM filter or if you want a green filter should out perform any so called cai on the market with stock water safety.
It was 2012, a different computer, and am no longer using Diablosport -- Unfortunately all that is left of the logs are the two pics, and thankfully they were in an old email.
Yep, stock water safety was a priority, and I'm using an AEM washable filter. Glad your giving it a go!
Last edited by Mr.T; 01-14-2017 at 05:34 PM.
#20
JK Newbie
Join Date: Aug 2021
Location: Stanardsville, Virginia
Posts: 4
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Hi Mr.T, i have recently done your CAI mod on my factory air box. I have a question. I have noticed that you are now using the AFE Power Momentum air box. Are you still utilizing the baffle mod you created on the new air box? If not, I was wondering what the temp readings are with baffle on factory airbox vs AFE with no baffle? Thanks!