simple mods for a rookie pt 2: ECU software and sport chrono
#1
simple mods for a rookie pt 2: ECU software and sport chrono
Since I can't reply yet I thought I'd reply this way for now.
Thanks dndodd and MCLC26 for your responses. One question - my car has the sport chrono pkg and wondering what are the positive/negatives of adding the ECU software? Or is it basically the same thing?
Thanks dndodd and MCLC26 for your responses. One question - my car has the sport chrono pkg and wondering what are the positive/negatives of adding the ECU software? Or is it basically the same thing?
#3
The sport button still works like before. I just don't use it. I think I have tried it once since the upgrades. I like the non-sport mode profile better especially with the upgrades I have made.
Last edited by dndodd; 03-05-2008 at 06:48 AM.
#4
I think you're asking if ECU flash and Sport mode are the same - the answer is no - Sport mode just changes the throttle response and adds nothing to performance while an ECU flash changes lots of the programming parameters (sorry I can't be more technical - I don't really know what it does to the computer) and greatly enhances performance.
#7
Here's what Sport Mode does - has no effect on the clutch.
Last edited by jhbrennan; 03-05-2008 at 12:06 PM.
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#8
You can search and find lots of discussion on what Sport Mode does to changing throttle inputs - check the pdf file I just posted for a very simple explanation of what happens. An ECU flash changes air/fuel mixtures, ignition advance plus other things that the engine gurus have programmed in. Based on dyno reports, ECU flashes don't trick you into thinking you have more hp, you actually get more hp - not so with the Sport Mode.
#10
Dyno's can be imprecise but even if the runs were completely accurate, have you gone back to the performance shop and asked what's wrong. I've always doubted if intakes and headers add much but your's is the first report I've heard that ECU programming hasn't worked. Maybe some of the experts can respond too.
#12
you are right - i did not have the plenum...could the plenum really add 25hp? surely porsche would have figured this out? i mean in todays world of more hp = better car im sure porsche would have saved money by simply putting in the plenum in their S cars rather than using a 3.8 liter engine instead of the 3.6 L...im no engineer..i can only give you my first hand experience...giac + evo intake and headers = zero additonal power...i dynoed my care before and after on the same dyno...i also dynoed again on a different dyno..still no power...the after dynos on the 2 different machines were almost identical.....
#13
you are right - i did not have the plenum...could the plenum really add 25hp? surely porsche would have figured this out? i mean in todays world of more hp = better car im sure porsche would have saved money by simply putting in the plenum in their S cars rather than using a 3.8 liter engine instead of the 3.6 L...im no engineer..i can only give you my first hand experience...giac + evo intake and headers = zero additonal power...i dynoed my care before and after on the same dyno...i also dynoed again on a different dyno..still no power...the after dynos on the 2 different machines were almost identical.....
#14
you are right - i did not have the plenum...could the plenum really add 25hp? surely porsche would have figured this out? i mean in todays world of more hp = better car im sure porsche would have saved money by simply putting in the plenum in their S cars rather than using a 3.8 liter engine instead of the 3.6 L...
Don't forget that Porsche still needs to consider things like gas mileage for marketing purposes... I'm sure they were aware of the possibility of increased performance but they may have decided that a more efficient exhaust system and plenum providing an additional 30-40 hp wasn't worth the loss of fuel economy... also consider the additional revenue coming from performance upgrades... all p-car buyers are not hp junkies like us...
#15
The engineers at Porsche could higher numbers from the engines if they wanted to .. but then it would cross into their other model-markets.