- garratyr wrote:
- Hiya Mike,
Mind if I ask a silly question? I'm guessing you mapped your stock pipes. Can you tell me what power commander you used and can you also tell me if doing this will lower fuel efficiency whilst improving performance. I'm sure it's a tit-for-tat, but wanted to ask!
I think where I'm coming from is:
1) Just got the bike so not interested in changing the exhaust yet.
2) Itching to do "some" upgrades, but nothing too serious until I get to know the bike a bit.
I had asked a friend about this and he said to forget about mapping the stock exhaust, as it will only result in maybe 5 horsepower, if that, and will result in lower fuel economy.
Ray, without all sorts of cam and head work there is nothing much to be gained by chasing horsepower with the 8V engine and even if you were to go down that route you would be making sacrifices elsewhere in the rev range. What a well mapped 8V excels at is smooth effortless torque from nothing to the rev limiter.
Where your friend got his 5 hp from I have no idea but I suspect it's a figure he plucked out of thin air. I've dyno'd a heap of 8V's and all of them in stock trim, at 800 metres altitude and ambient temperatures in the mid twenties Celsius make 96-98 rear wheel hp. People ask me how much 'Power' a well tuned and beetle mapped 8V makes and I'll say "About a hundred".
There are lots of people out there who claim absurd peak power figures for their modified 8V's. Sorry but the laws of physics and principles of engineering simply won't allow it. I've given up arguing with them. If they wish to believe that by putting a stupidly loud exhaust on, drilling some holes in the airbox and adding some sort of widget that interferes with the input or output of the ecu is going to suddenly net them big power increases they are wrong. Sorry, but they are.
For many years now the W5AM controller used on the CARC bikes has been an open book in tuning terms. The addition of sensor foolers or 'Power Commander' type widgets is completely unnecessary and can, and often does lead to problems with major over fuelling as the answer of most self proclaimed 'Experts' is simply to throw in a heap more fuel and turn the lambda input off. Given the fact that the stock maps are almost universally rich this is in fact the last thing you want to do but it sounds right so people get away with it.
Saving your original map and installing a new one takes about twenty minutes and costs you a fraction of what most of the plug in widgets cost and requires no chopping into or altering of the wiring loom which is a sure-fire way of making problems for yourself down the track.