Quote:
Originally Posted by Asim R32GTR
If you are talking about size... wouldn't mark be a big one?? 
But joke aside.... would you dare to comment on this??
Asim... |
I am much bigger than Mark!!!!!!Lol
Seriously though I can probably add my view on this topic, but you must understand a few things 1st.
1. "Tuner" one who tunes?
2. In my day a tuner was a person who syncronised carbs,changed the jets and chokes etc and optimised the ignition timing and contact breaker points dwell to optimise the running of the engine.
3. The fact that a company or joe public fits power enhancing parts to his car does not make them "tuners".
4. This old time tuner has been replaced by the clever computer literate person who presses buttons on a keyboard. What an easy time he has of it as well.
5 I spend my time building engines ,gearboxs and other major units and am not very often involved with the "tuning" of cars on the dyno.
Anyway ,briefley, my view on the subject.
Take a say 650ps car on the dynapack. Fitted with F/Con Pro, map sensor,but no V-Cam so the timing belt cover is removed in order to optimise the cam timing.Mapped to suit.
On the same day, same air pressure,humidity, temp. Remove the Pro and substitute an AEM ems.Remap car. the first thing you find is that the car will not accept the same amount of timing advance with this unit as the Pro. I can accept that the figures are not really 100% important, you know the Pro measures in degrees , the AEM measures in "eggs", so what just makes it harder for a geriatric like me to get my head round. But the bottom line is that "what the f ck" we have just lost 20 ps top end and a big load of torque on the way up.
Now my view on this as a spanner wielding mechanic is that there must be an ignition timing variance between the cylinders. You are tuning to the one displaying the most advance and some of the others may be perhaps 4 or 5 degrees behind it! Thats where your power has gone.
As regards the CAS, well ,run the car on the dyno with a good CAS installed and it wont show any timing fluctuation up to the limit of the timing light, in our case about 6000` rpm .That is with the engine loaded. Without it being loaded it does vary up to about a degree, but what is noticeable is that when loaded there are absolutely no harmonics issues with the belt when properly tensioned and under load.On the overrun it way "wag" about a bit.
Shame really that the AEM does not,at the moment, do what it says on the box.It would be a good bit of kit.
For the moment we will stick with the HKS unit!!
Tony