How to attack Meth dependent SD
Thread Starter
Racer
Joined: Jun 2011
Posts: 303
Likes: 13
From: Marietta GA
How to attack Meth dependent SD
Doug of ECS told me and I've read multiple posts stating that if you tune completely meth dependent and the meth ever fails for whatever reason then you go so lean it shouldn't damage the motor. Any of you guys who tune your SC setups Meth dependent and are more knowledgeable than myself, how do you go about attacking the vve table? Maybe my meth is coming in too fast but it goes rich quickly. After playing around with the vve table it seems difficult to get it to match that curve, especially after calculating coefficients. In other words how can I pull 10-15% fuel at 120-125 kpa without completely skewing the rest of the table? Any insight or advice would be appreciated. I'd love to see a screenshot of someones vve table that has this worked out.
Safety Car
Joined: Jul 2009
Posts: 3,755
Likes: 190
From: Baton Rouge LA
St. Jude Donor '14, '16
If you switch to the 2bar OS it will make this easier for you since the rest of the table won't be forced to fit the equations.
You can export your existing vve table with columns matching whatever you'd end up with in the 2bar os, paste it into excel and transpose and you've got your new ve table in the 2bar os format.
You can export your existing vve table with columns matching whatever you'd end up with in the 2bar os, paste it into excel and transpose and you've got your new ve table in the 2bar os format.
Safety Car
Joined: Jul 2009
Posts: 3,755
Likes: 190
From: Baton Rouge LA
St. Jude Donor '14, '16
I figured you were, but what I was getting at is that since the 2bar os provides a real table you won't have other areas getting messed up when you fit the coefficients. I'm not suggesting you switch I was just providing a solution to the question you posed.
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Melting Slicks
Joined: Jul 2004
Posts: 2,844
Likes: 144
From: Northern Ireland
Doug of ECS told me and I've read multiple posts stating that if you tune completely meth dependent and the meth ever fails for whatever reason then you go so lean it shouldn't damage the motor. Any of you guys who tune your SC setups Meth dependent and are more knowledgeable than myself, how do you go about attacking the vve table? Maybe my meth is coming in too fast but it goes rich quickly. After playing around with the vve table it seems difficult to get it to match that curve, especially after calculating coefficients. In other words how can I pull 10-15% fuel at 120-125 kpa without completely skewing the rest of the table? Any insight or advice would be appreciated. I'd love to see a screenshot of someones vve table that has this worked out.
Your post sounds confused.
If you tune an engine to be dependent on meth and the system fails, you will blow **** up.
You're stating it will do no harm....it will do harm.
Pro
Joined: Mar 2018
Posts: 660
Likes: 63
From: Fresno CA
I've read what he is talking about as well, but I think the only way this would work is if the ECU detected that the meth has failed under boost and cuts fuel completely in order to prevent lean conditions?Otherwise a lean condition would indeed blow up your motor, right?
Last edited by theandrewo; Jun 28, 2018 at 07:12 PM. Reason: grammar
Thread Starter
Racer
Joined: Jun 2011
Posts: 303
Likes: 13
From: Marietta GA
Yes running lean will hurt the motor. The theory is that if you run so lean when meth fails that it runs so shitty it will be obvious something is wrong. From what I understand extremely lean is better than slightly lean. As unreal said if there is not enough fuel to run then its much harder to damage the motor. My question now is if i tune for .75-78 lambda on a single 10gph nozzle will the engine run that much leaner if the system fails? Seems like It would put me much closer to the dangerous lean zone as the car goes rich by 10-15% with the meth. So you reverse that math it would put me at roughly 13/1 or .89 lambda.
Premium Supporting Vendor
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I hope that helps, but this is breaking my cardinal rule of never discussing tuning on forums, so I'm out! Best of luck with it.
Team Owner
Joined: Nov 2007
Posts: 24,035
Likes: 2,341
From: Gilbert AZ
Like when I had a fuel pump die. It would go 17:1, pop and stutter. Didn't hurt anything. 13:1 bad, 17:1 doesn't even run and you let out.
I've already told the OP how to handle this, either through adjusting the axis on the VE tables or using PE. Up to him how he wants to take it from here.
I've already told the OP how to handle this, either through adjusting the axis on the VE tables or using PE. Up to him how he wants to take it from here.
Thread Starter
Racer
Joined: Jun 2011
Posts: 303
Likes: 13
From: Marietta GA
Like when I had a fuel pump die. It would go 17:1, pop and stutter. Didn't hurt anything. 13:1 bad, 17:1 doesn't even run and you let out.
I've already told the OP how to handle this, either through adjusting the axis on the VE tables or using PE. Up to him how he wants to take it from here.
I've already told the OP how to handle this, either through adjusting the axis on the VE tables or using PE. Up to him how he wants to take it from here.