Jeep Garage  - Jeep Forum

Jeep Garage - Jeep Forum (http://www.jeepgarage.org/forums.php)
-   Diesel Powered 2012+ Export Grand Cherokee (http://www.jeepgarage.org/f157/)
-   -   Acceleration/Launch Delay (http://www.jeepgarage.org/f157/acceleration-launch-delay-31807.html)

frog_a_lot 11-29-2011 07:29 PM

Acceleration/Launch Delay
 
When i was driving the CRD Laredo and Limited at the Dealership, i noticed that when i was starting from a stop and i just slammed the throttle down, there was a good second or so delay before the car actually picked up and took off. Same sort of thing happened when i was travelling along the road and all of a sudden accelerated hard. All times the car was in "Sport" mode.

Is this a common thing with the Jeeps and the CRDs? Is it fixable? How? :)

Cheers

bing56 11-30-2011 01:55 AM

Re: Acceleration/Launch Delay
 
Quote:

Originally Posted by frog_a_lot (Post 524242)
When i was driving the CRD Laredo and Limited at the Dealership, i noticed that when i was starting from a stop and i just slammed the throttle down, there was a good second or so delay before the car actually picked up and took off. Same sort of thing happened when i was travelling along the road and all of a sudden accelerated hard. All times the car was in "Sport" mode.

Is this a common thing with the Jeeps and the CRDs? Is it fixable? How? :)

Cheers

Try fitting a after market chip. Worked on my diesel. Also remove rear mufflers from diesel which help in throttle response. Alternative keep left foot on brake and have a few revs on board at the lights....gone like sh-t of a shovel hehe. :slapfight:

Mendo 11-30-2011 03:03 AM

Re: Acceleration/Launch Delay
 
It's called turbo lag. It is common with all turbo powered vehicles but more noticeable in some depending on the boost range and at what revs this is generated. As The turbo spools up it provides more boost so Bing is correct in saying holding higher revs at the lights will reduce the lag. I must say the lag is much more noticeable than in my current 120 series prado but the tradeoff is once the boost is applied the jeep is much more powerful. Also is suggest when overtaking manually shifting down before planting the foot as this will also put you in the turbo sweet spot. I'm hoping once the car is run in and the computer gets used to your driving style this will also get better.

frog_a_lot 11-30-2011 07:00 AM

Re: Acceleration/Launch Delay
 
Its not really turbo lag, well it may be turbo lag + Auto + diesel etc all put together. I have had other turbo cars with higher boost thresholds etc, so i know its not just that. Probably also me needing to get used to an auto, never owned one, only manuals.

Oh well ill see how it goes when i actually get mine :) hopefully January

As for the chip.. keeping my eye out for info on chips for the new CRD engines, hopefully a good one will be available soon for a decent price.

bing56 12-04-2011 09:03 PM

Re: Acceleration/Launch Delay
 
Quote:

Originally Posted by frog_a_lot (Post 524577)
Its not really turbo lag, well it may be turbo lag + Auto + diesel etc all put together. I have had other turbo cars with higher boost thresholds etc, so i know its not just that. Probably also me needing to get used to an auto, never owned one, only manuals.

Oh well ill see how it goes when i actually get mine :) hopefully January

As for the chip.. keeping my eye out for info on chips for the new CRD engines, hopefully a good one will be available soon for a decent price.

You are right it is not turbo lag. it is an inbuilt electronic hesitation especially from dead stop and can be scary if you want to cross an intersection quick so you don't get cleaned up by another car. It does not instill confidence in the car when this happens. I have installed a chip (easychip) from the Uk and removed the rear mufflers from my diesel and it improves the response greatly. Remember that the go pedal is fly by wire and is operated by computers and sensors. :cool:

lll2for3lll 12-04-2011 09:19 PM

Re: Acceleration/Launch Delay
 
I believe it's all electronic when it comes to the WK2. With some mods and a good tune, the delay in throttle response will be eliminated.

toy4two 01-19-2012 12:13 AM

Re: Acceleration/Launch Delay
 
many turbo cars (Saturn Sky Redline/Pontiac Solstice GXP) the factory purposefully inserts some lag in first gear to avoid tire slippage, some even bleed off some boost. If you buy a chip it will remove this "nanny" feature.

If it really is turbo lag, which usually only happens with big ass turbos and lame non-dual entry turbos (old tech) then you can compensate by removing backpressure (install free flowing exhaust, downpipe, remove cat etc).

frog_a_lot 01-19-2012 12:30 AM

Re: Acceleration/Launch Delay
 
After actually recieving my CRd Laredo, this lag is not actually present, well havent noticed it.

There is the normal Auto Tranny lag as with any auto cars, but no where near as bad as the demo i drove.

No1Spcl 02-17-2012 01:12 AM

Re: Acceleration/Launch Delay
 
@Bing56 so how's that easychip working out, I found the web site (http://dieseltuning.uk.com/chrysler.html) , those are pretty impressive performance increase figures. If my conversions are correct it's up from 177Kw to 220kw. With the exchange rate being so good I think there could be some interest in getting one.

WK2Diesel 02-23-2012 08:38 AM

Re: Acceleration/Launch Delay
 
Hello

That's the box I use on my wk2, it's work great! very good upgrade!

http://www.racechip.de/racechip-chip...RD-4278-r.html


All times are GMT -5. The time now is 05:25 PM.

Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Copyright 2012 - JeepGarage.Org
The Jeep Grand Cherokee Owners Community