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Old 01-15-2019, 01:41 PM   #1
InstaGib
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Question OFT Tunes - V4 uses the same tune for both EL and UEL header designs?

I've been doing quite a bit of reading leading up to the spring, when I plan to do summer tires + alignment + brakes + Tomei UEL headers + OFT tune. Now I understand that the V4 tunes use the same tune for both EL and UEL headers, but my question is why/how?

In the past these were broken out into separate tunes, which makes more sense to me as wouldn't the exhaust valve timing be different? I've also read that V4 suffers from worse fuel economy, so now I'm wondering if I should just stick to the V2 tunes, or if there's just something I'm not understanding here.

I've tried to search for some info related to this, but I'm having some trouble digging through posts, so please feel free to redirect me if this has been discussed in detail before.
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Old 01-15-2019, 04:58 PM   #2
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Yes you could use older v2 tunes
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Old 01-17-2019, 11:20 AM   #3
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Originally Posted by steve99 View Post
Yes you could use older v2 tunes
Sure, I understand that, but why the change at all? If the tunes could have been the same between header designs without performance/reliability concerns, then why were they originally split into EL/UEL specific tunes?

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Old 01-17-2019, 11:49 AM   #4
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i think v4 are mostly tuned for OFH uel header
if you use them with other headers is mostly a compromise
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Old 01-17-2019, 11:54 AM   #5
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i think v4 are mostly tuned for OFH uel header
if you use them with other headers is mostly a compromise
Do you have a source for that? This is the first time I've heard of this, and I can't even find anywhere to buy the Open flash Header any more.

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Old 01-17-2019, 02:00 PM   #6
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mostly because the cam timings for. v4 are identical to the OFH v2 tunes Shiv released time ago
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Old 01-18-2019, 12:32 AM   #7
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Originally Posted by InstaGib View Post
Sure, I understand that, but why the change at all? If the tunes could have been the same between header designs without performance/reliability concerns, then why were they originally split into EL/UEL specific tunes?

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their is some advantage having specific cam timings for each type of header, but the difference is not great unless you have very different design header like ace or p-tuning


saves time not having many different tunes for little advantage
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Old 01-18-2019, 07:47 AM   #8
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their is some advantage having specific cam timings for each type of header, but the difference is not great unless you have very different design header like ace or p-tuning


saves time not having many different tunes for little advantage
Okay, that's kind of what I suspected then, thanks.

Are there changelogs or anything like that, that I can read over?

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Old 01-18-2019, 08:06 AM   #9
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Okay, that's kind of what I suspected then, thanks.

Are there changelogs or anything like that, that I can read over?

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The older v2 tunes came with a readme file but not the V 4 only jnfo will be on the openflash support website or compare v4 tune to stock rom in romraider to see changes
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