Stock Exhaust, Race ECU map???

[wilmar13]

The dyno chart posted in the tank thread by WJN that showed no peak HP gains after dumping stock exhaust for aftermarket (he had head work, cams and race ECU running with stock exhaust) got me thinking…
Any word on a larger tank?

I have not seen and can’t find any dynos where someone looked at ECU mod only with stock exhaust… Could it be that there isn’t much low hanging fruit on the stock exhaust other than weight?

Most people (including myself) look at a dyno showing before vs after (stock vs 2-1 ECU mod) and associate the gains to the exhaust… but maybe the stock pipe flows fine? Sure it runs lean when you uncork it so you have to use a different map, but what happens if you use that different map on the stock exhaust? Do you still get a large % of the power increase that you attribute to the exhaust? Probably not what someone that bought a $2500 exhaust wants to consider, or anyone that sells them, but is this possible?

Does anyone have any testing or data where you have stock bike for baseline(1), followed by race ECU with more aggressive mapping but retain stock exhaust (2), then go with freer exhaust (3), rather than going from 1 to 3.

I guess to state it more bluntly would you get 80% of the power bump with ECU and stock exhaust compared to package?

I know I can core stock exhaust, etc…. I am more interested in whether the big gains attributed to exhaust ECU upgrade are really mostly the ECU alone… i.e. You can get a decent power boost, without spending for the whole system and pissing off your neighbors by keeping the quiet stocker…?

[GMP]

FWIW, I don't have any dyno data but I can tell you by seat of the pants that the 2-1 ECU (#187B) made a big difference with the stock exhaust before the LV system was installed on my bike. I rode over 2K miles with this setup. The LV system improvement was minimal except on the very top, where you see the least use on the street. Don't get me wrong I like the system, it fits and sounds great and saved some weight, but you will get most of the improvement from the ECU itself.

[disgo duc]

i find that hard to believe there are plenty of people on this forum that showed dyno results at peak hspwr that had signifigant gains just with exhaust and cat eliminator without ecu and with.that might be some bunk info.i havent had my bike dynoed yet but is in the process right now.the desmo 1100 is quite capable of 140 hp.

[wilmar13]

Originally Posted by GMP

You will get most of the improvement from the ECU itself.

Wow, so it wasn't a crazy thought after all... makes sense I guess if you really think about it.

[wilmar13]

Originally Posted by disgo duc

i find that hard to believe there are plenty of people on this forum that showed dyno results at peak hspwr that had signifigant gains just with exhaust and cat eliminator without ecu and with.that might be some bunk info.i havent had my bike dynoed yet but is in the process right now.the desmo 1100 is quite capable of 140 hp.

No, I was asking the opposite... ECU with stock exhaust... in other words the stock exhaust isn't really that much of a limiter, the ECU map is.

For sure a louder exhaust feels faster as the visceral aspect adds quite a bit to the placebo effect, and all dyno stuff I have seen is exhaust + ECU, I was just curious how much of the contribution is from the ECU itself and if upgrading exhaust (and noise factor) is really worth it.

In the modern era cats in high performance cars are no limiter except for maybe that last .05%, so why would it be any different on the Duc? Anyone know the cell density of the stock cat on the HM?

[GMP]

I did not run the cat with the DP ECU, however I also did this with the stock ECU. I got my bike last summer and in traffic the heat was a little much, eaisly improved with the LV cat eliminator. There are dyno results that show the cat eliminator good for a hp or two on top.

I trimmed the ECU down below what it is set at now with the LV system. IMO, for the street, the biggest gain was in the vastly improved ridability and smoothnes of the motor and the 30 deg + oil temp drop, not to mention the heat loss from ditching the cat. Even if it gained 10 HP total on top for me it makes no difference, that wasn't the point. The motor now runs like it should, like Ducati would like it to run, not like the way the govt agencys say it must.

Unless you plan on a full Termi, look for a #187B ECU, get the LV cat eliminator, and take it from there. If you add a pipe later its then just a trim adjustment.