Adrian I think your car would be Hotwire injection, in which case you will find some improvement from chipping , but don't expect too much. The Librands exhausts will make much more difference than chipping. 4.6 cars definitely need a Tornado chip, 4.0 cars definitely need a chip for both fuel and ignition , and the latter are also the cars that benefit from the knock sensors (MMC omitted to fit them) .
For the 3.9 Hotwire cars the differences are more subtle, but the drivability does improve and the response is certainly better, but don't expect more power or better fuel consumption. The standard chip is designed to fuel the engine a little lean and run the engine hotter, in order to keep down the emissions , changing the priorities to correct mixture does richen the fuelling maps and thus improve drivability. Personally I think the Tornado is the better choice , the Optimax appears to be focused on better economy, but the Tornado is biased towards performance, and in a light car the latter is the better option. I am not sure that knock sensors are an option for this system , because I don't think the ecu has the feedback loops integrated into the ignition maps, but there are others who know far more than I about this system, and I will stand corrected by one them. Regards Andy PS Send me an OG message if you would like to discuss this in more detail. >________________________________ > From: Adrian Slade <[email protected]> >To: mogtalk2 <[email protected]> >Sent: Sunday, 5 August 2012, 14:39 >Subject: [mogtalk2] +8 to chip or not to chip > >Hi > >I am sure this may have been asked before but advise would be appreciated. To >my 96 3.9L +8 I have fitted librands twin stainless exhausts and manifolds, >and a K&N filter this has improved performance but I understand the engine can >run a little lean plus the torque curve can be improved with an ECU CHIP >change, either Optimax or Tornado. Also I believe that Vauxhall knock sensors >can be fitted that turn 90 degrees and clear the new manifolds. > >Can anyone tell me their experiences with either chips and/or knock sensor and >what you think. Is it worth it, impact or improvement on fuel etc. > >Regards, > >Adrian > >Sent from my iPad > > >------------------------------------------- >View posts on The Mail Archive >http://www.mail-archive.com/[email protected]/ >[http://www.mail-archive.com/[email protected]/] > >Modify Your Subscription: https://www.listbox.com/member/?&; >Powered by Listbox: http://www.listbox.com > > > ------------------------------------------- View posts on The Mail Archive http://www.mail-archive.com/[email protected]/ [http://www.mail-archive.com/[email protected]/] Modify Your Subscription: https://www.listbox.com/member/?member_id=22459785&id_secret=22459785-4a39ddf8 Powered by Listbox: http://www.listbox.com
