Originally posted by Eevolution3@Sep 10 2004, 06:30 PM
Hope you dun mind me answering that..
The Pro start uses an external module connected to the F Con V on which launch rpm is selectable in 200 rpm increments depending on the selected working range rpm.. the additional beauty of this is that fuel is automatically added during the activation of the throttle if the computer sees that the mixture is leaning during the launch sequence..
The Autronic SMC and SM2 has this feature thru use of its anti-lag chip but of course the SM2 being the more advanced ecu has all of what the F Con V Pro has except that there is no fuel enrichment function. When the throttle is held open to activate the launch, the EGT temperatures spikes up with the disadvantage is that the throttle cannot be held open too long or else you will have a meltdown on the turbine wheel..
Same goes for the Haltech. Not sure on the Microtech...but they are pretty close in the functions and setup..
I think what you have described is known as "anti-lag system" or "misfiring system" or the layman's term as "bang bang system". This is not the same as launch control or some call it "dual stage rev limiter".
Yes,anti-lag system will give rise to high EGT and may result in burnt exhaust valves or cracked manifold. The beauty of this system is that it allows you to spool the turbo when you open the throttle to any % and the boost will build up while you are preparing for launching. You probably need to set up the "launch control" to limit the rpm(and thus the boost) so that your wheels will not spin like mad and defeat the whole purpose of a decent launch. Most decent computers such as Motec, Autronics, Haltech will basically allow the user to enrich the fuel mixture and to retard timing during operation of the anti-lag system.
The launch control, as I understand it, is simply rpm limiting at the activation of a switch by the user. The rpm is selectable at the user's choice. Once the desirable rpm is set, the user can just simply go WOT without overreving the engine while waiting to launch. If you are running ball bearing turbo or small turbo, you may be seeing some boost or even more by doing this. This mode is normally preferred to the anti-lag system. Hope I am not far out of topic. :)
