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  #1  
Old 02-15-2015, 10:58 PM
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Diesel Lag

I took delivery of my Summit CRD on 12/27/14 and truly love it, it is an amazing ride. One thing that bothered me was the slight hesitation when you stepped on the throttle. This is very common on all diesels. I also had the same issue with my 2005 Dodge Cummins. Yes... had the same issue. I installed a Throttle Sensor adjuster from BD diesel Performance on my Dodge and eliminated the issue.

Once I took delivery of the new JGC, I waited two weeks before I could not resist getting one for my Jeep. Installation took about 10 minutes, and she was ready to test drive. The Throttle Sensor has (3) settings.. stock, 50% and 100%. Basically, do you want stock, mild, or wild. Since I am the primary driver, I set it to the 100% setting. This little box, really make the Jeep rip. Really amazed at the difference it makes.

All that this device does to connect into your throttle and advances the throttle sensor accordingly. Simple... dealers cannot detect it, therefore, it does not void your warranty.

I let my neighbor drive it (Local Dodge Dealer Manger) to see the difference, and he was amazed. He said that it almost felt like the Hemi. Since installing, I lost about 1 MPG in the city, and have the same on the highway.

Anyway..... really love this thing and wanted to be sure to share with the group. See BD Diesel Performance dieselperformance.com for the Throttle Sensor Booster. You will not be disappointed.


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Old 02-16-2015, 12:40 AM
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Re: Diesel Lag

This is pretty much a problem on all new vehicles with electronic throttle control as the manufacturer programs in a curve that is not proportional to pedal position and has a set delay prior to allowing the throttle to to re-position. I drove a manual transmission Dart that this made pretty much undrivable. I have heard of peopel having the ECU re-programmed to eliminate this, but have not heard of a plug-in like this.

How does this device change the sensitivity of the throttle? Does it get rid of the sudden jerk felt when you floor the gas and you have to wait for the engine to react?
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Old 02-16-2015, 01:50 AM
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Re: Diesel Lag

Turning off hill start assist makes a big difference too.
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Old 02-16-2015, 05:59 AM
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Re: Diesel Lag

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Originally Posted by Benn0 View Post
Turning off hill start assist makes a big difference too.
Where do you turn that off?
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Old 02-16-2015, 07:19 AM
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Re: Diesel Lag

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Originally Posted by Jeep_GC View Post
Where do you turn that off?
It's an option in the settings menu. Under "Safety & Driving Assistance."
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Old 02-16-2015, 07:29 AM
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Re: Diesel Lag

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Originally Posted by timmy_ View Post
This is pretty much a problem on all new vehicles with electronic throttle control as the manufacturer programs in a curve that is not proportional to pedal position and has a set delay prior to allowing the throttle to to re-position. I drove a manual transmission Dart that this made pretty much undrivable. I have heard of peopel having the ECU re-programmed to eliminate this, but have not heard of a plug-in like this.

How does this device change the sensitivity of the throttle? Does it get rid of the sudden jerk felt when you floor the gas and you have to wait for the engine to react?
It is an issue with most cars nowadays but exacerbated if the engine has a turbo as there is spool lag as well as electronic lag. I used to get around this with my previous CRD Jeep as I'd be able to spool up on the gas and hold the brake - but the new Ecodiesels give you an error if you have your feet on both pedals at the same time.
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Old 02-16-2015, 08:01 AM
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Re: Diesel Lag

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Originally Posted by jaje View Post
but the new Ecodiesels give you an error if you have your feet on both pedals at the same time.
Wonder if it doesn't do that with HSA disabled?
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Old 02-16-2015, 08:54 AM
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Re: Diesel Lag

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Originally Posted by jaje View Post
I used to get around this with my previous CRD Jeep as I'd be able to spool up on the gas and hold the brake - but the new Ecodiesels give you an error if you have your feet on both pedals at the same time.
I have never had a problem doing a launch like that in my 2014 EcoDiesel (read: no error messages). Then again, I'm not exactly flooring it with the brake engaged... just spooling it up to about 1100 rpm. It works: no lag or hesitation once I start accelerating.

This maneuver does fill up the DPF rather quickly, though, so I rarely perform it.
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Old 02-16-2015, 06:23 PM
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Re: Diesel Lag

Turbo lag. Ask any jet or turboprop pilot. Same problem.


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Old 02-16-2015, 06:38 PM
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Re: Diesel Lag

Yeah, I don't think its turbo lag, I've owned 2 other turbos. It feels like the torque converter taking a while to engage to me. At take off from stand still, foot down, the revs come up, but the car doesn't move for a split second. Perhaps the throttle sensor adjuster just puts a bit more power through the converter and it engages quicker.....

However, turning off the hill start has been a big change, it is much more acceptable now.
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Old 02-16-2015, 06:46 PM
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Re: Diesel Lag

Turning off hill start assist helps. Noticed a huge difference when backing up the driveway.
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Old 02-17-2015, 09:18 AM
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Re: Diesel Lag

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Originally Posted by Jeep_GC View Post
Wonder if it doesn't do that with HSA disabled?
HSA works great (if you don't hit the throttle enough for it to move forward when the HSA disables itself) - it's when I'm at a stop on level ground and want immediate power if I have to pull hard.

Quote:
Originally Posted by Roadkill View Post
I have never had a problem doing a launch like that in my 2014 EcoDiesel (read: no error messages). Then again, I'm not exactly flooring it with the brake engaged... just spooling it up to about 1100 rpm. It works: no lag or hesitation once I start accelerating.

This maneuver does fill up the DPF rather quickly, though, so I rarely perform it.
I left foot brake when I drive autos so I'd do it all the time when I'm driving (even when not at a standstill) in order to balance the car and carry speed (the WK2 can handle pretty darn well for such a big / heavy vehicle).
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