OFT v2.076|Wayne Rom v130|OFT v4.01 Dynos

[Yoshoobaroo]

Originally Posted by Jasonb

They are made for 91/93 and made to work best with the UEL open flash header. So if you're using 93 and a UEL header like I am it'll work very well. Can't be a huge difference between the open flash header and the JDL.

The runners go to different spots on the collector, but that said, I am now running the V4 maps (before I was running the V2 with JDL-specific VVT tables) and I don't notice a difference in power delivery. I really like the V4 maps, they feel more refined.


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[Jasonb]

Originally Posted by Yoshoobaroo

The runners go to different spots on the collector, but that said, I am now running the V4 maps (before I was running the V2 with JDL-specific VVT tables) and I don't notice a difference in power delivery. I really like the V4 maps, they feel more refined.


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You think we'd get anything extra out of using the JDL vvt tables over what's in the V4 tunes now?

[Teseo]

Originally Posted by Jasonb

You think we'd get anything extra out of using the JDL vvt tables over what's in the V4 tunes now?

Not much, the best gains would be on a custom tune

[Yoshoobaroo]

Originally Posted by Jasonb

You think we'd get anything extra out of using the JDL vvt tables over what's in the V4 tunes now?

No, without a dyno you couldn't tell on the V2 maps either. The biggest change was a slight difference in induction noise when coming up on cam.


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[Wayno]

Originally Posted by Jasonb

So you're saying it won't make less power at .7, than at 1.0? That can't be true.

ROM A
IAM = 0.75
KCA cell value = 4
Base timing cell value = 20
Total ignition advance = 20 + 4 x 0.75 = 23

ROM B
IAM = 1.00
KCA cell value = 5
Base timing cell value = 18
Total ignition advance = 18 + 5 x 1.00 = 23

So yes, it can be exactly true.

[Jasonb]

Originally Posted by Wayno

ROM A
IAM = 0.75
KCA cell value = 4
Base timing cell value = 20
Total ignition advance = 20 + 4 x 0.75 = 23

ROM B
IAM = 1.00
KCA cell value = 5
Base timing cell value = 18
Total ignition advance = 18 + 5 x 1.00 = 23

So yes, it can be exactly true.

But any tune will still only make it's maximum power when the IAM is at 1.0. correct?

[tomm.brz]

Originally Posted by Wayno

ROM A
IAM = 0.75
KCA cell value = 4
Base timing cell value = 20
Total ignition advance = 20 + 4 x 0.75 = 23

ROM B
IAM = 1.00
KCA cell value = 5
Base timing cell value = 18
Total ignition advance = 18 + 5 x 1.00 = 23

So yes, it can be exactly true.

sorry wayne i don t really understand this reasoning of yours
in your example the total timing is the same, therefore same power..
but that means basically only that "ROM A" has more aggressive timings than ROM B right? as soon as ROM A reach IAM = 1, ROM A reaches higher timing and therefore more power

[steve99]

Originally Posted by tomm.brz

sorry wayne i don t really understand this reasoning of yours
in your example the total timing is the same, therefore same power..
but that means basically only that "ROM A" has more aggressive timings than ROM B right? as soon as ROM A reach IAM = 1, ROM A reaches higher timing and therefore more power

ROM A would have the potential to run more advance if the fuel was good enough to let the IAM reach 1.


I think wayno was just pointing out that just because iam is 1 its not necessary running more timing or making more power. Depends on a lot of other factors not just iam value.

[nikitopo]

Originally Posted by tomm.brz

sorry wayne i don t really understand this reasoning of yours
in your example the total timing is the same, therefore same power..
but that means basically only that "ROM A" has more aggressive timings than ROM B right? as soon as ROM A reach IAM = 1, ROM A reaches higher timing and therefore more power

I understand his reasoning. It is a way to combine two tunes in a single map. The issue is that the ECU doesn't really know if it runs a 91 or a 93 fuel and if there aren't knock events, it 'll rise the IAM up to 1 and run the more aggressive map even with a 91 fuel. Then you can have a bad knock in high rpm and if this happens many times then kabum. I am not saying that it will happen, but it is a possible scenario. You cannot really be sure on such things if you haven't test the tune extensively. And extensively means at least two developments car for at least 100k km each in different conditions. I just don't like the fact that the tuner created all this mess, instead of providing two different maps per fuel. It is not a rocket science.

[tomm.brz]

are you joking to me nikitopo? what you just said, it s the thing i said exactly so to you around 1 month ago. Nice memory... it' s not a rocket science also to search our last messages in this thread of 1 month ago to find out that i even had to explain you 3 times because you couldn't understand it. I m amazed but happy you finally found out how it works. Bravo!


I was intending another thing actually, by the way doesn't matter
I misunderstood basically what wayne was trying to say, but at the end was just an obvious thing he wanted to say so it's all ok now



also you should understand that a stock map, that as you know has a IAM of 0.7, knocks A LOT more than these ots maps.. a lot.
If you think you will reach a point of damage with the v4 tunes, a stock car would be destroyed already long time before flashing this tune

[steve99]

Remember All stock factory tune in all years auto/manual all run same strategy ie IAM initial set to 0.7.


below is stock car on stock tune running 95 RON fuel in South Africa, that's best fuel they can get. Not every 86/brz in South Africa has blown up, the Subaru knock management is very efficient.


https://datazap.me/u/steve99/south-a...=1477440000000











Yes it would be better to have specific tunes for say 91 and 93 usa fuels and 95/98 ron fuels but they are just using the same strategy the factory does, tune for better fuel, then set iam to 0.7




Subaru knock strategy explained, it way more complex than you think example is for 16 bit ecu but similar to 32 bit logic, iam in 16 bit is 1 to 16 , where 32 bit ecu its 0 to 1


http://www.romraider.com/forum/topic1840.html




simplified version


http://www.romraider.com/RomRaider/H...ndKnockControl

[tomm.brz]

it would be better of course but if i would have to use OFT i wpuld be glad to not have to flash any time if for reasons i only get bad/non premium fuel, even if i dont share the fear that nikitopo has, i wouldnt like the idea of letting it knock so much to adjust to a shittier fuel
but well i shouldn t even say a word, i bought ecutek with racerom also for this reason

[nikitopo]

Originally Posted by tomm.brz

are you joking to me nikitopo? what you just said, it s the thing i said exactly so to you around 1 month ago. Nice memory... it' s not a rocket science also to search our last messages in this thread of 1 month ago to find out that i even had to explain you 3 times because you couldn't understand it. I m amazed but happy you finally found out how it works. Bravo!

I said what I was saying one month ago. You just like playing with the words and giving your own meaning or we have a language barrier.

[tomm.brz]

The posts of yours say another thing, they are there. I guess it was all my fault trying to correct your wrong declares shame on me!