Discussion
Sadly the above post is correct.
Hi Graham.
If you look at it the chip can only effect the fuel ratio as unless I’ve mis understood it the timing will not be effected by a chip change.
Happy to be corrected.
Either way a chip change might add or remove fuel here or there but it’s a generic map so what’s known as a best guess map. Some old Tvr dealers had a number of these chips in there box with different fuelling characteristics and simply swapped them based on engine info, and if they were lucky the best guess map worked.
I went aftermarket Ecu so my car could be bespoke mapped to the engine but we have one fantastic Tvr man who can still re map your car on the CUX system who is reasonable in price and a great guy ta boot in Joolz of Kits and Classics.
Spend what will likely be similar money and Joolz can give your map a tweak that will do all a different chip ( might do)
Essentually a rolling road session ( if nesesarry ) and burn a new chip for you.
Not after he’s made sure all your other ignition system components are working either so from what I know of Joolz and the people who have used him say that’s where I’d go to get honest Tvr advice on this subject before spending a penny.
If your trying to get a smoother running map you might get some good results this way, unless you do mods I don’t think you’ll get many more horses as flat out is flat out and the engine runs out of induction to be able to add anymore fuel anyway.
I think Joolz can tweak the timing as part of mapping so in my experience of aftermarket Ecu where timing plays a big role in how the engine runs may be where he can get you more acceleration etc.
Worth giving him a call I’d say.
Hi Graham.
If you look at it the chip can only effect the fuel ratio as unless I’ve mis understood it the timing will not be effected by a chip change.
Happy to be corrected.
Either way a chip change might add or remove fuel here or there but it’s a generic map so what’s known as a best guess map. Some old Tvr dealers had a number of these chips in there box with different fuelling characteristics and simply swapped them based on engine info, and if they were lucky the best guess map worked.
I went aftermarket Ecu so my car could be bespoke mapped to the engine but we have one fantastic Tvr man who can still re map your car on the CUX system who is reasonable in price and a great guy ta boot in Joolz of Kits and Classics.
Spend what will likely be similar money and Joolz can give your map a tweak that will do all a different chip ( might do)
Essentually a rolling road session ( if nesesarry ) and burn a new chip for you.
Not after he’s made sure all your other ignition system components are working either so from what I know of Joolz and the people who have used him say that’s where I’d go to get honest Tvr advice on this subject before spending a penny.
If your trying to get a smoother running map you might get some good results this way, unless you do mods I don’t think you’ll get many more horses as flat out is flat out and the engine runs out of induction to be able to add anymore fuel anyway.
I think Joolz can tweak the timing as part of mapping so in my experience of aftermarket Ecu where timing plays a big role in how the engine runs may be where he can get you more acceleration etc.
Worth giving him a call I’d say.
You can burn a new chip yourself with thanks to all the hard work from some of the guys on this forum if your willing to have a play.
A rolling road tuning session would probably be a better option if you don't like to tinker yourself.
http://remap-14cux.uk/
A rolling road tuning session would probably be a better option if you don't like to tinker yourself.
http://remap-14cux.uk/
The only thing you can do with the ignition timing is modify the bob weights in the distributor unless you go down the fully mapped ignition market at some expense like Megajolt, Omex, or 123 ignition. You can file a fraction off the bob weights to allow a few more degrees peak advance, but TBH, ive yet to see any documented evidence messing around with the timing actually produces any gains over the original advance curve.
Fuel map wise, TVR have already done there bit on the map to maximise the power, but one small gain can be made by extending the fuel table up to 6200 rpm. As it is now, the peak fuel point is around 5400 rpm, so you get the most fuel per engine cycle and it stays at that point as you rev to 6000 rpm. Problem is the engines breathing becomes inefficient at these high RPM's so you get less less air against the amount of fuel, so the mixture becomes too rich. This makes the power drop off faster than need be, but it does add a physical safety margin and keeps the engine cool. Jools can remap to get the missing power back, but your are pushing your luck with the engines physical limits.
At lower RPM (below 3400 rpm) The fuel map is set to keep the mixture at 14.7:1, and if its wrong, the ECU corrects it anyway. This can lead to a bit of shunting if its a long way out and big corrections are being made, so a good map should minimise the required correction.
Id avoid any high priced aftermarket chips, there is no documented improvements over the TVR maps in power or MPG. Steve Sprints free down loads are worth a punt if you want to mess around with an Eprom programmer as there are some really nice touches like the latest ECU Lucas firmware and improved stepper control, in addition to the best of the TVR maps and extended fuel table mapping.
Fuel map wise, TVR have already done there bit on the map to maximise the power, but one small gain can be made by extending the fuel table up to 6200 rpm. As it is now, the peak fuel point is around 5400 rpm, so you get the most fuel per engine cycle and it stays at that point as you rev to 6000 rpm. Problem is the engines breathing becomes inefficient at these high RPM's so you get less less air against the amount of fuel, so the mixture becomes too rich. This makes the power drop off faster than need be, but it does add a physical safety margin and keeps the engine cool. Jools can remap to get the missing power back, but your are pushing your luck with the engines physical limits.
At lower RPM (below 3400 rpm) The fuel map is set to keep the mixture at 14.7:1, and if its wrong, the ECU corrects it anyway. This can lead to a bit of shunting if its a long way out and big corrections are being made, so a good map should minimise the required correction.
Id avoid any high priced aftermarket chips, there is no documented improvements over the TVR maps in power or MPG. Steve Sprints free down loads are worth a punt if you want to mess around with an Eprom programmer as there are some really nice touches like the latest ECU Lucas firmware and improved stepper control, in addition to the best of the TVR maps and extended fuel table mapping.
Gassing Station | Chimaera | Top of Page | What's New | My Stuff