Vishnu VS. Cobb Tuning
09-03-2004, 09:04 PM
#31
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Originally Posted by vaus
Shiv,
If you read my post, I merely say that he should talk to the tuner about his aftermarket boost control and make sure that the tune is meant for it. I'm sure you can map the TPS crossover to match a more agressive boost response. My point was that the ECU needs to be mapped for the specific boost control method used, weather it be the stock boost solenoid, an EBC or MBC.
Unless Ecutek has changed the actual functionality of the OL/CL switchover to be triggered by the MAP instead of TPS, my statement holds true.
-- Ed
If you read my post, I merely say that he should talk to the tuner about his aftermarket boost control and make sure that the tune is meant for it. I'm sure you can map the TPS crossover to match a more agressive boost response. My point was that the ECU needs to be mapped for the specific boost control method used, weather it be the stock boost solenoid, an EBC or MBC.
Unless Ecutek has changed the actual functionality of the OL/CL switchover to be triggered by the MAP instead of TPS, my statement holds true.
-- Ed
Shiv
________
BMW R12
Last edited by Vishnu; 03-07-2011 at 04:53 AM.
09-04-2004, 01:00 PM
#32
Originally Posted by Vishnu
It doesn't hold true. The switchover parameters are based upon TSP, engine operation time, calculated load and a few other second order parameters. It's a bit more complicated that MAP vs. TPS.
Shiv
Shiv
. I see how you could come close to this, but I doubt you could get it to be very consistant accross different forms of boost control, with varying rates of boost rise, using the switchover parameters you mentioned. Like I said, you could come very close, but I still think slight adjustments would be necessary.
-- Ed
09-05-2004, 05:51 AM
#35
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what you really need is a way to force the ecu into open loop fueling mode once a certain manifold pressure is reached. this is probably most easily done by spoofing the throttle position sensor's signal.
ken
ken
09-05-2004, 08:28 AM
#36
My whole thing is that I want to be able to run two complete maps. One for either 95-100oct or race gas (c16) and then one for 91oct. Be able to switch them over at the track days. And also maybe be able to run more agressive AF with the higher boost map (something closer to 11.5:1 and something higher than 17.5psi boost). My turbo can support higher boost so I want to really feel the difference between the low boost (17.5) and the high boost (say about 22-25psi).
I don't want to run utec. And I've just heard that with the 18G turbo that you need someother form of boost control, like the Apexi unit I stated or some other form of boost control. The ecutek seems to be holding the boost fine but it does taper off quickly.
I'm still a total noobie when it comes to this stuff...that's why I leave my tuning up to the tuner. I know that mbc can't switch maps, I know that the ebc sometimes has a high boost and lower boost mode but that it dosen't really change your overall map. I still have no real idea how the Apexi unit works or how it would work with the ecutek. From what I've read here it looks like regardless of which boost control unit someone uses they have to get it re-tuned to match up with their ems, right??
Is there a link that is good for better understanding of some of the things you talk about above and how they work?
I don't want to run utec. And I've just heard that with the 18G turbo that you need someother form of boost control, like the Apexi unit I stated or some other form of boost control. The ecutek seems to be holding the boost fine but it does taper off quickly.
I'm still a total noobie when it comes to this stuff...that's why I leave my tuning up to the tuner. I know that mbc can't switch maps, I know that the ebc sometimes has a high boost and lower boost mode but that it dosen't really change your overall map. I still have no real idea how the Apexi unit works or how it would work with the ecutek. From what I've read here it looks like regardless of which boost control unit someone uses they have to get it re-tuned to match up with their ems, right??
Is there a link that is good for better understanding of some of the things you talk about above and how they work?
09-05-2004, 01:31 PM
#37
Originally Posted by ride5000
what you really need is a way to force the ecu into open loop fueling mode once a certain manifold pressure is reached. this is probably most easily done by spoofing the throttle position sensor's signal.
ken
ken
That's correct. My Open Loop Manager does exactly that but its mainly for stock ECUs. I would expect a tuned ECU to take care of the switchover on its own without any gadgets.
-- Ed
09-05-2004, 01:37 PM
#38
Originally Posted by lowball
My whole thing is that I want to be able to run two complete maps. One for either 95-100oct or race gas (c16) and then one for 91oct. Be able to switch them over at the track days. And also maybe be able to run more agressive AF with the higher boost map (something closer to 11.5:1 and something higher than 17.5psi boost). My turbo can support higher boost so I want to really feel the difference between the low boost (17.5) and the high boost (say about 22-25psi).
I don't want to run utec. And I've just heard that with the 18G turbo that you need someother form of boost control, like the Apexi unit I stated or some other form of boost control. The ecutek seems to be holding the boost fine but it does taper off quickly.
I'm still a total noobie when it comes to this stuff...that's why I leave my tuning up to the tuner. I know that mbc can't switch maps, I know that the ebc sometimes has a high boost and lower boost mode but that it dosen't really change your overall map. I still have no real idea how the Apexi unit works or how it would work with the ecutek. From what I've read here it looks like regardless of which boost control unit someone uses they have to get it re-tuned to match up with their ems, right??
Is there a link that is good for better understanding of some of the things you talk about above and how they work?
I don't want to run utec. And I've just heard that with the 18G turbo that you need someother form of boost control, like the Apexi unit I stated or some other form of boost control. The ecutek seems to be holding the boost fine but it does taper off quickly.
I'm still a total noobie when it comes to this stuff...that's why I leave my tuning up to the tuner. I know that mbc can't switch maps, I know that the ebc sometimes has a high boost and lower boost mode but that it dosen't really change your overall map. I still have no real idea how the Apexi unit works or how it would work with the ecutek. From what I've read here it looks like regardless of which boost control unit someone uses they have to get it re-tuned to match up with their ems, right??
Is there a link that is good for better understanding of some of the things you talk about above and how they work?
As far as running different maps... most people would point you to the UTEC, but I don't blame you for not wanting to run one. With an Ecutek/EBC combination you could have a bit more control, and run several boost maps. You could also tweak things a bit with the user tune feature. The tune will be a little trickier since you will basically be using the same timing and fuel maps for the different boost levels. You could use the user tune feature to scale the maps appropriately, but that would require a laptop every time you wanted to change maps.
Another option is the Hydra ECU. I haven't used this personally, but some people have reported good things.
-- Ed
09-05-2004, 01:41 PM
#39
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Someone told me using an EBC with ECUTEK will cause part throttle lean conditions and could possibly lead to engine damage. Why use an EBC if the ECU already controls boost to hit at safe linear levels?
09-05-2004, 03:51 PM
#40
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Originally Posted by vaus
Ken,
That's correct. My Open Loop Manager does exactly that but its mainly for stock ECUs. I would expect a tuned ECU to take care of the switchover on its own without any gadgets.
-- Ed
That's correct. My Open Loop Manager does exactly that but its mainly for stock ECUs. I would expect a tuned ECU to take care of the switchover on its own without any gadgets.
-- Ed
Regards,
Shiv
________
KAHUNA
Last edited by Vishnu; 03-07-2011 at 04:53 AM.
09-05-2004, 04:26 PM
#41
Originally Posted by Vishnu
the ECU simply CANNOT be closed loop when any reasonable amount of boost is generated (regarless of turbo/boot control configuration).
Regards,
Shiv
Regards,
Shiv
BTW, the OLM was just a little project of mine that started out as an analog device with a lot of configuration via trim pots. Since then I've gone to a micro-controller and some pretty trick code that gives me nice control of the switchover and allowed me to smooth it out very nicely throughout the RPM range. Note it doesn't use an RPM input
. I just made this to tide me over with an MBC untill I could tune my own ECU to my liking.-- Ed
09-05-2004, 04:29 PM
#42
Originally Posted by Lurk
Someone told me using an EBC with ECUTEK will cause part throttle lean conditions and could possibly lead to engine damage. Why use an EBC if the ECU already controls boost to hit at safe linear levels?
-- Ed
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