Question about exhaust and ECU

[RavnMonster]

Ok I read the sticky but I'm still slightly confused.

If I were to by an aftermarket exhaust such as a full Arrow kit and do not get the air filter do I need to mess with the ECU?

What if I do get a K&N air filter, will I then need to upgrade the ECU?

IF so what are my options for ECU upgrade? And can this be done on my own, or does it need to be tuned by a dealer?

My bike is a 2005 Monster S4R

thanks and sorry for the repetition, I'm a noob. 

[teddy037.2]

as long as your intake side is still stock, then you probably won't need any ECU mods (DP chip, PC3, etc).

even though you're getting higher flow through the exhaust, the engine can only draw in so much air.


most of the parts you can bolt on yourself, but (at least in the case of the PC3) taking it into a dyno tuner will provide the best result (vs. a downloaded 'canned' map  on the internet)

[CDawg]

To be explicit, it depends largely on your airbox.  If you stay with OEM, then you may be okay.  If you go with an open airbox (and the requisite oil-based air filter) then you definitely will need something (DP ECU, RB3, PC, etc...) unless you get lucky by disconnecting the O2 sensor.

[asado]

I have the Quat-D ex-box and DP open airbox with the stock ECU.  I did get a lot of backfiring, stalling and surging with the termi slip on and stock airbox before I switched to the ex-box.  It was so bad that it goes all the way up to the airbox.  I had the dealer remap my stock ECU but with no dice (still running lean) and they suggested that the only way to cure it is with a new DP ecu (in a tune of $1000 iirc).  I followed the advice of a fellow member and replaced my front sprocket to 14t coupled with the open airbox, it cured the surging and stalling but the backfiring was still there.  I ditched the termi for the Ex-box and the backfiring was cured. Just my 2 pesos

[thruxton]

.... I had the dealer remap my stock ECU but with no dice (still running lean) and they suggested that the only way to cure it is with a new DP ecu (in a tune of $1000 iirc).  I followed the advice of a fellow member and replaced my front sprocket to 14t coupled with the open airbox, it cured the surging and stalling but the backfiring was still there.  I ditched the termi for the Ex-box and the backfiring was cured. Just my 2 pesos

their suggestion is solid. i am glad you got it sorted though!

but i will never mod a duc without putting forth the cash for the DP ecu. if are care about tuning the low end (i think it's to 40% tps and 5000rpm) then the extra investment is worth every penny.

[asado]

their suggestion is solid. i am glad you got it sorted though!

but i will never mod a duc without putting forth the cash for the DP ecu. if are care about tuning the low end (i think it's to 40% tps and 5000rpm) then the extra investment is worth every penny.

My low end is fine, runs better than stock and it was a "suggestion" and not the only cure.  Long as im not hurting the motor, shorten the life in any way without having the DP ecu then im happy with what i have.  I dont ride agressively, fast and have no desire in gaining any more hp than what I currently have.  But, if i was told that the DP ecu is the only cure to my problems, only then i would spend $1k on a plastic box.

[Armor]

The 05 S4R does not have an O2 sensor.  You do not need a DP ECU.  If it does not run right your dealer can adjust the trim.  To run even better, you can add a PC3.

[darkduke]

but i will never mod a duc without putting forth the cash for the DP ecu. if are care about tuning the low end (i think it's to 40% tps and 5000rpm) then the extra investment is worth every penny.

I ended up buying a slip-on termignoni set for my Rs with the DP ECU and open airbox. I installed the ECU, cut the top off of my original airbox lid (cuz that's all the termi kit is), dropped in a K&N, put on my home made pipes and then just rode it to the dealer to have it tuned and the TPS reset.  I sold the slip-ons and DP filter and lid on ebay. I ended up making enough on the pipes/filter to make the ECU well worth it. I love the way it runs now, zero popping and it pulls really nice and smooth now. Plus the intake sounds angry when the throttles open up and suck in all that air 

[uclabiker06]

If it does not run right your dealer can adjust the trim.  To run even better, you can add a PC3.

+1.

[Spider]

can a mechanic alter more 'parameters' fore a DP ECU than stock.

from above I understand 'trim' co2 / fuel mixture levels can be altered....the DP ECU obviously has another map in it - but can mechanics alter more?

Spider

[hypurone]

can a mechanic alter more 'parameters' fore a DP ECU than stock.
from above I understand 'trim' co2 / fuel mixture levels can be altered....the DP ECU obviously has another map in it - but can mechanics alter more?
Spider

Yes, to a small degree. They can adjust the CO % a bit. But it is a shotgun approach and not a 100% perfect adjustment for all rev ranges. Ask me how I kow...Been there, done that. Got the addt'l PCIII and dyno work to prove it!  [moto]

[Spider]

Thanks mate 

I got the full termi kit for mine - and installed the open air box, then was going to put the exhaust on next week and then put the ECU on in a year...figuring the new map is what 'boosts' the system, increasing HP (*something I'm not interested in!).

My new approach - put it all on next weekend and then get the mech to adjust trim levels and good to go!

[mxwinky]

Yeah, the DP ECU is the ultimate answer for really perfect running at all rpms.  On my '05 MTS with the 1000DS 2v engine I was able to get away with a full system and just the fuel trim adjustment, but only with the stock airbox setup.  If I open up the airbox it'll need more than the fuel trim adjustment will give it and I'll have to do either a PCIII (not the best) or the DP ECU.  On the S4RS with the full Termi system and the open airbox, the DP ECU made it simply flawless.  I can't believe how well the bike runs with this setup.  It certainly has enough grunt now that I don't think I'll ever need to drop to the 14t cs sprocket.  Heck, it'll wheelie all too easily in the first three gears as it is so why would I need more snap than that?  An absolutely stunning system!

[hypurone]

Thanks mate 
I got the full termi kit for mine - and installed the open air box, then was going to put the exhaust on next week and then put the ECU on in a year...figuring the new map is what 'boosts' the system, increasing HP (*something I'm not interested in!).
My new approach - put it all on next weekend and then get the mech to adjust trim levels and good to go!

I think you misunderstood my post. I was referring to adjusting the DP ECU. The stock ECU will NOT be able to handle the Termi system. You NEED to install the DP ECU with the system or you could blow her to bits!  Plus it ain't gonna run right at all and you will have a check engine light on the whole time.

[Spider]

I think you misunderstood my post. I was referring to adjusting the DP ECU. The stock ECU will NOT be able to handle the Termi system. You NEED to install the DP ECU with the system or you could blow her to bits!  Plus it ain't gonna run right at all and you will have a check engine light on the whole time.

understood - I am now fitting it all together - so I've learnt from you!!

In fact last night I installed the DP ECU and the airbox (exhaust is off being ceramic coated) and will install pipes on Friday then ride her cross town for a trim.

Thanks mate!

I've heard/read the only other process I have to do is remove the battery cables for 10 seconds to reset. I've read that I don't have to red key the ECU - there aren't any performance gains it just 'weds' the system together.