It's all relative.12.5 mpg is relatively better than 12 mpg.
Hell I was happy when I found out I get a solid 11.8 Mpg rather than the 10 I thought I used to get lol
Dyno Testing Bolt-ons On The 4.0
- Thread starter Jezza
- Start date
Hell I was happy when I found out I get a solid 11.8 Mpg rather than the 10 I thought I used to get lol
Hell I was happy when I found out I get a solid 11.8 Mpg rather than the 10 I thought I used to get lol
My summer mpg is double my winter mpg.
Interesting. Fuel blend or idle time? That's almost the exact opposite of mine. In cold weather my Jeep puts down around 15, but when temps exceed 90 she nose dives down to around 10 or less.
Nah. It's all the slow cruising with the top and doors off so everybody can see you. Super aerodynamic and efficient 
I've been driving this thing around as a daily for the last few weeks. It is getting 16ish average MPGs. That's with a few spirited accelerations here and there.
I just posted a wrap up video for the bolt-on series if anyone id interested.
You're welcome. I enjoyed the process as well. It's a blast to drive. I'm going to do a Transgo shift kit on the crappy 32rh. Hopefully that with sharpen it up a bit. I may also do an e fan soon as well. Ultimately I need it mostly stock so I can mock up the turbo kit on it.
Could you tell us a bit about how the Wrangler drives on the street with all these mods done versus stock?
Is it a lot quicker than stock from light to light? How is the fuel economy? Will it spin the tires in the dry?
Thanks, Matt
Perth, Western Australia
Is it a lot quicker than stock from light to light? How is the fuel economy? Will it spin the tires in the dry?
Thanks, Matt
Perth, Western Australia
Check out his YouTube Oxcart Jeep Episode 13 Final Thoughts. Can't imagine a reliable 4.0 spinning the tires.
Unfortunately at 7000ft altitude you loose about 40 hp. Maybe with the right drivetrain, tires, road surface, but it's a big ask.
I feel like it's quick. I want to do another 0-60 at some point. It will spin the tires from a stop no power braking. I am still running the stock tire size though. I am going to do some additional videos at some point. My editing software decided not to play nice with a Windows update, so I have been unable to edit anything recently.
Is there asummary post with all the different stages/tests? or do I need to trawl through 30+ pages to find each individual post ?
Find this stuff awesome to read about but don't need the fluff/filler
Find this stuff awesome to read about but don't need the fluff/filler
Yes, as mentioned, Jezza does a summary of all the different mods and his thoughts on one of his later videos.
Is there asummary post with all the different stages/tests? or do I need to trawl through 30+ pages to find each individual post ?
Find this stuff awesome to read about but don't need the fluff/filler
watch his youtube series:
Thanks for the response Jezza, and others. I look forward to any future videos or tests done. It's a great series and I've watched all the videos.
I'm glad I found this series as I'm building up a 4.0 currently. I chose the Howards Street Force 1 cam, which is almost identical to Isky's 256/262 cam.
It has 203 and 209 degrees duration at .050 with .445 and .448" lift on a 110 LSA. My desktop dyno simulations show it should perform similarly to the Comp 231 cam you used.
It will be combined with a freshly rebuilt .030" over block that has been decked .015". Calculated compression is 9.4:1. The head has three angle seats, back cut valves and light pocket porting. I also have HP tuners to tune it afterwards.
My XJ has 4.56 gears, AW4 and 30" tires so the revs pick up very quickly on the street. It's a lightweight build focused on street performance as it's my daily driver.
I'm looking forward to seeing how it performs!
One more question, Jezza. Is there a noticeable torque loss under 2000rpm with the 231 cam you used?
My desktop dyno simulations show that there is a torque loss from idle to 1800rpm, compares to the 96+ stock cam, and then afterwards it builds more power/torque over stock until 5000rpm or so. It seems it broadens the power/torque curve substantially.
Thanks, Matt
My desktop dyno simulations show that there is a torque loss from idle to 1800rpm, compares to the 96+ stock cam, and then afterwards it builds more power/torque over stock until 5000rpm or so. It seems it broadens the power/torque curve substantially.
Thanks, Matt
