I'm getting a little old for hot rods so this will probably be my last. The thing is a monster in little car clothes. It is one of the most responsive and powerful engines I've encountered.
451 hp seems rather detuned for the engine however. I don't want to spend a fortune of else I would have gotten a SL65. Is there a processor only upgrade available? I seem to remember reading of one for about 2900.00 but that seems a little steep, as in wife would then want a new house. I see no reason the engine couldn't put out a detuned 550 hp with just a computer upgrade?
USA. I didn't think about anyone from England etc answering. I doubt the Dealer has anything. Didn't even think about asking them though. I definitely would like to keep the warranty effective though.
Why should a usenet group, especially one in English, be used by people of only one country?
This group is a pale shadow of itself, and use to have many more people from many more countries participating, but even so we are not all from one place.
Doesn't have anything to do with anything. Nt looked at the group before, I think< and generally most groups are pretty much all North America or seem to be seen here. I'm not on the computer that much, so I don't see where all the posts come from.
By the way.... a reply from Denmark (which is not in US to my recollection) :o)
I suppose you mean Renntech?
They do:
- chiptuning + 66 hp
- carbon fiber airbox + 12 hp
- stainless steel headers + 16 hp
- performance sound pipe + 10 hp
A totally 555 hp compared to standard 451 hp - which is +15% by chip tuning ("without sacrifice") and +7% by air flow optimization in inlet/ exhaust.
So yes, you can do something by chip tuning. But is it really without sacrifice?
Sacrifices will for sure be fuel economy and pollution. So when you say "undertuned", it is also depending what you want.
And you can be certain, AMG know what they are doing.
I fact the 6,3L engine (which is in fact only 6,208L) is made in a number of different versions, where the 525 hp version is used for most applications and the most powerfull being 571 hp for the SLS "Gullwing", demonstrating the potential of the engine.
They also go for higher power outputs, but then they use the 5,5L engine with compressor or turbos.
Optimum combustion ("stoichiometric") occurs at a certain fuel/air ratio. Your engine has a compression ratio of 11.3, which is rather high. In order to avoid destructive knocking, the ECU will retard the ignition timing at full throttle, causing less than optimum engine performance. Knocking can also be reduced by enrichening the mixture, so ignition doesn't need to be retarded so much, causing better performance in terms of power but less performance in terms of combustion effficiency.
This is what chip tuning is about. And this is where sacrifices come in too, including risking the reliability.
If you solely want more hp, you can use the Renntech ECU or similar. Or you can be happy with your perfectly engineered monster machine as it is :o)
I haven't examined all the tuning differences but wondered if part of the detuned state is marketing. They wouldn't want to undercut the E, S, or SL series by offering the same output as the more expensive cars. I would have bought an e but none could be found. The 5.5 with twin turbos might be a little over stressed. Will have to wait and see. I won't be trying to explore the limits of the 6.3 but would like to have the best tune etc. A computer upgrade is about all I would want to do. The exhaust and intakes etc are nicely engineered for the package. 10 or 20 hp isn't that much. A hundred, well that's different. I would like to see the 550 to 570 range and no limiter. Of course that would mean new Y tires. They should have put them on originally. I wish I had stumbled across the 2 year old SL65 with 8,000 miles before I found this one. Almost the same price. I;m pleased with this car though.
457 hp for 6,2L isn't that bad but isn't extremely impressive either. They still get 525 hp out of basically the same engine, but I don't know which differences else than just the ECU programming (which to my opinion cannot be done without sacrifices - and AMG probably would not detune just for marketing purposes) they do to make the difference. Cam timing, inlet/exhaust design etc. could be the answer. Perhaps someone with exact knowledge could tell.
SL 65 with 5,98L biturbo producing 670 hp at 5.400 rpm and 1.000 NM at
2.200 to 4.200 rpm?...... wild thing! Then you've got hot rod.
Note that it has compression reduced to 9:1 to allow for the boost pressure (without knocking).
The manufacturer has produced an optimised solution of power, fuel consumption, suspension etc. In this case no doubt with a 'sporty' bias, given it's an AMG.
Why on earth would one wish to waste money on fiddling with that and, possibly, degrading the performance of the car as a whole?
DAS
To reply directly replace 'nospam' with 'schmetterl>> >>>
The idea is to get the most from it without doing anything detrimental. If it can't be done I won't do it nor will I do it if it cost an arm and a leg. The thing performs really great. No doubt with the limiter taken off the ecu it would do over the speedometer numbers. I won't be trying to find out though.
Don't see that much from other Countries, except occasionally from Canada, Australia, Netherlands and England , on other groups. I don't spend too much time on the net though to see where everyone is from. Don't take offense.
Just as a little extra comment as comparison on how "little detuned" the AMG is with its 457 hp:
Corvette has 436 hp from its comparable 6,2L engine in its best tuned naturally aspirated version (LS3).... and 638 hp in the supercharged version (LS9).
I am not at all offended, just amused that you assume that everyone knows what you are talking about and from the US etc (thus reinforcing a stereotype).
Interestingly, in a recent review in a UK paper your car was the subject. The reviewer thought it was pretty goo but would have been better (from a performance point of view with the twin-turbo motor...
Does that make you feel better?
FWIW, for most 'normal' people these differences will be impercetable in 'real life'? How many actually achieve the 0 - 60 mph figures the manufacturers quote? Who would want to, given the engine-torture involved and fuel consumption involved?
Even in my CLK with an 'ancient' 3.2 l engine with just over 200 hp I reach illegal speeds very quickly...
Well I guess the concept that if a little power is goo then a lot is better. No such thing as too much power, too many women, too much money, or..... The twin turbo v12 would be great, if it didn't cost a new house. Fuel consumption. 15 mpg is not bad. Not worried about 12. In Britain and Europe where taxes are stupid high that would be different.
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