Maybe by this time next year!;)Quote:
Originally Posted by Lotz-A-Landies
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Maybe by this time next year!;)Quote:
Originally Posted by Lotz-A-Landies
I think you are being rather unfair on Cooper's with your statement about being crap, over time the general condition of your vehicle will change as will the settings. Isn't this why we get them tuned regularly?Quote:
Originally Posted by PhilipA
More than that any competent dyno operator should review the settings and start afresh.
I took my RRc back to Coopers today to have dual mapping activated in the Motec ECU to run LPG and even though they installed and tuned the system over time the performance has fallen off.
Like your Autotech mob Cooper's have been able to get an increase on my vehicle and yes they performed the operation in 2nd.
Dyno graph on petrol.
https://www.aulro.com/afvb/images/im...09/12/1214.jpg
Dyno graph on LPG.
https://www.aulro.com/afvb/images/im...09/12/1215.jpg
Have to agree with you about the performance improvement and wonder about the dyno understating the initial test, but why would they bother?Quote:
Originally Posted by PhilipA
Would you be able to reconcile the graphs by working out the relative speeds in the different gears then shifting the graph to corellate with the calculated speed/gear?
Am still very happy with Graeme Cooper Automotive. :) Have been one of their customers since 1988 and will continue to use them.
Diana
P.S.Pod: Oops - missed your point about my missing the point, but what ever the point let us hope that fuel doesn't get to the $200/litre point! :( :( :(Quote:
Originally Posted by POD
Did they tell you why they dyno in second? I would have thought 3rd would give a more accurate reading being closer to a 1:1 ratio,
Dyno'ing in second would give a higher HP and thus torque reading as the dyno would ramp up quicker.
Im not critising Coopers or your tune i just wondered with the carry out the tune in 2nd gear?
LucusQuote:
Originally Posted by Lucus
I have no idea why they do it in 2nd and you are possibly correct about ramping up quicker. It may be something to do with an auto transmission 2nd being roughly equivalent of 3rd in a manual, however having seen and heard vehicles on the dyno I can imagine it could be a safety or noise polution issue. The last thing you would want would be two tonnes plus of RRc taking off at full pelt into Princess Highway without a driver if one of the straps broke.
What I would also summise would be that the performance curve would be quite similar whether done in 1st 2nd, 3rd or top, just the speed would move along the horizontal graph.
What I can do is ask the question when I go in there on Thursday to pick up a part.
Diana
Manual are generally done in 4th as this is 1:1 and the only torque mulitplier is th diff ratio.
If i recall correctly 3rd is 1:1 in a ZF 4 spd.
Most dyno's top out at around 180 to 200kph so a range rover spinning up too 150(ish) in 3rd wont worry it. Generally if a car does break straps they dont leap of and shoot down the road and full speed as the have Zero interia and momentum. You would be picking bits of engine and driveline off the workshop floor.
I have seen and inter truck jump off a dyno at full tilt. It screwed the driveshaft off the diff,bent the trans out put shaft and twisted the diff on the springs, it only move foward aprox 5 metres though.
Dyno'ing in second will give you a higher peak power reading but as your only using the dyno as a tuning tool the acutal number isnt the issue its the average power under the line and how much it increase after the tune.
93kw is pretty impressive for an LPG engine!:cool: what model motec are you running?
Lucus
The Motec is the M48 but it isn't one with logging and I'm unaware about the software version. It hasn't been changed since install in 1997.
B.T.W. you are looking at the petrol graph (on E10 petrol - BP91) the LPG graph is the 85.4 Kw.
Diana
Ok okay.....85kw is still bloody good for a lpg engine. Injected or vapour?
9% power difference between LPG and petrol is pretty:cool: Goes to show what a bit of timing can do for and LPG engine:)
Lucus
It's a vapour system. With the price of petrol these days I'm very happy with the conversion and haven't had the problems that some people have had with the LPG injection systems. Nor have I had any backfire problem as I don't use the MAS of the standard systems.
Getting the dual mapping enabled to switch as I change fuel through the Motec ECU should make it that little bit better again.
Diana
So does anyone know what driveline loss a rangie has?
I dyno my diesel 3.9 rangie up a viaduct which I know the exact slope of. From this I know I've got 74kw at the wheels at 2000rpm. That's manual in 4th (1:1), an LT230 with the 1:1.003 high range and 225/75R16 BFG AT's.
Hey , I like Graeme Cooper. It was Spiro who said they were crap not me.Quote:
I think you are being rather unfair on Cooper's with your statement about being crap
I was pointing out that wherever you go they will claim the last person knew nothing. But I must say that Spiro did sit me down and show me that Ward had been inconsistent with the amount of timing and fuel added/subtracted eg 12% at one point and 2-3 at the next point instead of a smooth transition.
The outcome from Spiro is not perfect either. On hot start now the stepper revs to 1500 , almost stalls , revs etc etc. Its OK if you can wait for a few seconds to stabilise. I think it is because of the extra advance which picks up over say 1000RPM The ECU says whoops too many revs, drops out all the steps, then puts some back in etc.. Its an amplification of what 14CUX naturally do and I think why Cooper initially take out advance. Probably down to Autotech not being familiar with 14CUX. Old hat to them. I will maybe take it back to them after I get back.
I would still be going to Cooper if they had not relinquished the Unichip Franchise. Graeme recommended that I have the unit checked before the big trip.
I am willing to live with it if I get better fuel economy and seeing that the V8 sits on only about 1500 around town, I probably get better economy.
Regards Philip A