Hi, Guest
08-10-2007, 05:15 AM
Agreed (sortof) ... you've already got an 87 tune ... it's called "stock" and it's fine.
I wouldn't bother with an 89 tune. I went with a 91 tune and purchased a 94 tune and love them both. IMO there isn't enough difference to warrant the cost of 94, but then again I only have the exhaust so someone with more mods might get more out of it.
You can't get yourself in trouble playing around with the adjustable settings ... because truth be told they simply don't offer much adjustability. Plus it's dead nuts simple to go back, so long as you don't "save" the adjusted settings.
There's three spark settings (0-2k, 2-4k, 4-7k) and at most you can advance or retard timing by 1 or 2 degrees (2 degrees max 0-2k, 1 degree max for the other ranges).
But no matter what you do, the ECU will still pull timing if it senses detonation, so the failsafe remains.
Same with WOT fuel trim - a few percentage points adjustment at the most. And although this does impact the fuel trims at less than WOT, again the ECU will adjust if it senses too lean or too rich - except of course at WOT.
The tire size adjustment seems strange to me ... it offers a range of 500 to 900 tire RPM per mile. Well, the stock focus is around 835 and the number goes up as does the circumference of the tire ... so the practical range is 835 to 900 ... not much to frig up there. FWIW my 215-45-17s are about 855 rpm per mile.
I wouldn't bother with an 89 tune. I went with a 91 tune and purchased a 94 tune and love them both. IMO there isn't enough difference to warrant the cost of 94, but then again I only have the exhaust so someone with more mods might get more out of it.
You can't get yourself in trouble playing around with the adjustable settings ... because truth be told they simply don't offer much adjustability. Plus it's dead nuts simple to go back, so long as you don't "save" the adjusted settings.
There's three spark settings (0-2k, 2-4k, 4-7k) and at most you can advance or retard timing by 1 or 2 degrees (2 degrees max 0-2k, 1 degree max for the other ranges).
But no matter what you do, the ECU will still pull timing if it senses detonation, so the failsafe remains.
Same with WOT fuel trim - a few percentage points adjustment at the most. And although this does impact the fuel trims at less than WOT, again the ECU will adjust if it senses too lean or too rich - except of course at WOT.
The tire size adjustment seems strange to me ... it offers a range of 500 to 900 tire RPM per mile. Well, the stock focus is around 835 and the number goes up as does the circumference of the tire ... so the practical range is 835 to 900 ... not much to frig up there. FWIW my 215-45-17s are about 855 rpm per mile.
NOS2Go4Me,Aug 9 2007, 02:41 PM Wrote:Although I've only driven with my tune for less than a week, here's my opinion:
Don't piss with the "adjustable" options unless you know what you're doing. I went to adjust my tire size and froze, because the first "adjustable" option was a setting for the 0-2000 RPM spark settings. Whoa. Ask and ask again before doing anything with it that you're not familiar with.
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2008 Fusion SEL MTX - DD1 * 2009 Fusion SEL - DD2 * 2007 Focus ZXW - R*I*P * 2004 Focus ZTW CD Silver - sold * 2004 Focus ZTW Black - sold * 2003 Focus ZTW Black - sold * 2001 Focus ZTW Gold - sold * 2000 Focus SE Wagon (ZTW option) - Black - sold * 2000 Focus SE Wagon (ZTW option) - Gold R*I*P
2003 Focus ZX5 infra-red Track Rat - R*I*P
2003 ZX5 CD Silver Track Rat - retired, but still in the driveway
New track rat: 2000 ZX3, Atlantic Blue * JRSC with lots more to come
* New Zetec crate motor - NFG - thanks Topspeed *
2003 Focus ZX5 infra-red Track Rat - R*I*P
2003 ZX5 CD Silver Track Rat - retired, but still in the driveway
New track rat: 2000 ZX3, Atlantic Blue * JRSC with lots more to come
* New Zetec crate motor - NFG - thanks Topspeed *