Accelerator booster

[gossamer]

Has anyone tried one? I'm wondering if one of these would help my Disco3 V8, it seems slow to respond which i learn t just today can be a common problem with fly by wire throttles. When its idling i can dab the throttle and get no response it only when you hold it it does something.

http://www.ppcgb.com/products/sprintbooster-auto-trip-tronic-electronic-throttle-booster-sbde321a
PlugNGO Throttle Controller (http://plugngo.com.au/)

[SBD4]

Have a read of this review, I think it is a good objective write up and describes well how it "works":

Sprint Booster- My Review w/0-60 data - Club Lexus Forums (http://www.clublexus.com/forums/performance/527320-sprint-booster-my-review-w-0-60-data.html)

[gghaggis]

You already have one - put the car in sand mode!

[~Rich~]

X2 ;)

[gossamer]

You already have one - put the car in sand mode!
Thanks can u just drive around in sand mode all the time? i also wondered weather i keep it in sport mode as its a lot more responsive in sport.

[Epic pooh]

As a fellow v8 d3 owner what you've written doesn't sound right to me. In neutral mine revs quite responsively (but it knows it is in neutral so it only responds to clear inputs - squeeze not stab like other vehicles). What is the actual issue when driving (I've had my share of niggles so might be able to comment, possibly even helpfully haha) ?

[gossamer]

No actual issue just reading the speal on how they make it more responsive esp in kick down overtaking and given how much they come alive after 3500rpm i thought it might wake up a bit earlier.

[Epic pooh]

Yep, I get what you're saying. That's the kind of performance you get when you put (basically) a sports car motor into a very heavy 4wd ... but that said, mine is coming on pretty strong by 3000rpm and by 3500 is screaming its way very quickly to the redline. I would very rarely call it anything other than reasonably lively for such a big vehicle (mine is as quick as a Liberty GT 0-40 ... after 40 is a bit shattering ... but anyway ... ).

If it is excessively doughy and unresponsive, reset engine ECU adaptive learning and Transmission adaptive ECU learning. This will get it to forget bad learned habits and you'll get a bit of a responsiveness boost if this hasn't been done for a while. I recently changed plugs (140km, first plug change), cleaned throttle body and several sensors and new airfilter = quite an improvement (pretty standard servicing stuff but the intervals are very long on these vehicles).

I've had a passing interest in a bit better low down performance (who doesn't want more low down torque !?!)- google up LR3 & AJ-V8 tuning - but have never come across anything that seemed significant / value for money. Let us know if you try something out !

[gossamer]

hmmmm never even thought of changing the plugs :( is it hard to do?

[Epic pooh]

Easy job just take off the covers, each plug has its own coil so unscrew and then change out plug. They are ngk laser iridium plugs (exxy). I did all the things I mentioned at once (throttle body, filter, sensor clean, reset engine ecu) and it felt like I gained a lot of grunt (could be illusory but it made me happy). Not sure that plugs alone would be noticeable.

[gossamer]

Plugs done :D pretty easy to do and id say they were over due, feels better but that could just be my mind justifying the cost. be interesting to see how it goes power wise and economy wise next week when i tow the camper to Cobar (cliffhanger)
Still has a hunting issue where the rev hunt up and down when its cold under no load?

[Epic pooh]

Do you mean hunting at idle, worse when cold ? If so, as a first pass, clean the throttle body and MAF sensor (and any other sensor you can get your hands on in the intake circuit !). Also reset engine ECU adaption if you have a suitable electronic tool (this makes a noticable difference because if the TB and sensors have been dirty then the ECU is ignoring certain airflow inputs and using a standard value).

[gossamer]

No idle is fine, its when im diving at say 70kph in a high gear flat rd the revs hunt up and down probably a good 500rpm. im going to get a toothbrush and carby cleaner out on the throttle body in case it is it (being heated and all), but im sure i read on here somewhere its a transmission issue.
On a side note i brought an airbag switch to turn off the passenger airbag for when i have the laptop mounted their during nav events, bit of a fail it turns the airbag off but wont turn it back on, disconnected it and the airbag comes back on but the light is still on in the dash, might reconnect the switch and disconnect the battery and see if it will learn its now there???

[Epic pooh]

Could be, no expert on trans issues (fortunately), but others around here have plenty of experience and might chip in.

I suppose the obvious question is has the fluid been changed ? If not, that might be a good place to start (I've done steel pan conversion and flush at about 130,000km - smoother is all the impact I had and it was quite smooth to start with).

Don't know on the second either, likely it has logged a fault that needs to be cleared before the airbag light will go off - if so, disconnecting battery won't assist matters.