Home
What's new
Latest activity
Authors
Store
Latest reviews
Search products
Forums
New posts
Search forums
What's new
New posts
New listings
New products
New profile posts
Latest activity
Members
Current visitors
New profile posts
Search profile posts
Log in
Register
Cart
Cart
Loading…
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Search titles only
By:
Menu
Log in
Register
Navigation
Install the app
Install
More options
Change style
Contact us
Close Menu
Forums
Mustang Forums
2011-2014 Mustangs
Engine/Tuning
Vp ms109
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="wile2k" data-source="post: 14898520" data-attributes="member: 75530"><p>Aaron, good to see you on this post. This has me wondering if I have a fundamental flaw in my understanding of this.</p><p></p><p>In the above mentioned thread, both Eric@JPC and Beefcake (both of whose knowledge I respect) seem to indicate that running MP109 on a E10 tune will cause you to run leaner than expected at WOT. I don't see how. E10 is going to be stoich of ~14.1:1 while MP109 is ~13.4:1, and let's say we are commanding a .788 lambda in the tune... For the E10 that is going to be an AFR of 11.1 and for MP109 it is going to be 10.56 (thus slightly richer than what would have been expected and seemingly very safe). </p><p></p><p>I'm more concerned in the other direction, for example in my tune lambda is set to 14.08 (expecting E10) and .788 at WOT is 11.1... If I run non-Ethanol gas (14.7:1 stoich), then that same .788 is now an uncomfortable AFR of 11.6 which I think is too lean for a boosted car on 91 (even given my conservative timing of 14.5 degrees). </p><p></p><p>Anyway, Riptide, I just don't see the concern with MP109 on your E10 tune. On top of MP109s crazy octane rating, it seems to me that you are actually running slightly richer than your tuner commanded due to the change in stoich. You probably aren't getting your money's worth without tuning for all of the octane but from a safety standpoint, I just can't see a problem.</p><p></p><p>I can see a problem if you were tuned for MP109 and ran E10 (not even talking timing, just stoich). If you were tuned for 11.0:1 on MP109's stoich of 13.4 (.821 lambda), then ran E10, your AFR would be 11.56 (14.08*.821) which would then be leaner than expected, and perhaps too lean... Heaven forbid if you ran non-ethanol on that tune (14.7*.821 = 12.07 AFR, much leaner than you'd like for a boosted application).</p><p></p><p>Aaron, I hope you pop back in to correct my understanding if I'm off...</p></blockquote><p></p>
[QUOTE="wile2k, post: 14898520, member: 75530"] Aaron, good to see you on this post. This has me wondering if I have a fundamental flaw in my understanding of this. In the above mentioned thread, both Eric@JPC and Beefcake (both of whose knowledge I respect) seem to indicate that running MP109 on a E10 tune will cause you to run leaner than expected at WOT. I don't see how. E10 is going to be stoich of ~14.1:1 while MP109 is ~13.4:1, and let's say we are commanding a .788 lambda in the tune... For the E10 that is going to be an AFR of 11.1 and for MP109 it is going to be 10.56 (thus slightly richer than what would have been expected and seemingly very safe). I'm more concerned in the other direction, for example in my tune lambda is set to 14.08 (expecting E10) and .788 at WOT is 11.1... If I run non-Ethanol gas (14.7:1 stoich), then that same .788 is now an uncomfortable AFR of 11.6 which I think is too lean for a boosted car on 91 (even given my conservative timing of 14.5 degrees). Anyway, Riptide, I just don't see the concern with MP109 on your E10 tune. On top of MP109s crazy octane rating, it seems to me that you are actually running slightly richer than your tuner commanded due to the change in stoich. You probably aren't getting your money's worth without tuning for all of the octane but from a safety standpoint, I just can't see a problem. I can see a problem if you were tuned for MP109 and ran E10 (not even talking timing, just stoich). If you were tuned for 11.0:1 on MP109's stoich of 13.4 (.821 lambda), then ran E10, your AFR would be 11.56 (14.08*.821) which would then be leaner than expected, and perhaps too lean... Heaven forbid if you ran non-ethanol on that tune (14.7*.821 = 12.07 AFR, much leaner than you'd like for a boosted application). Aaron, I hope you pop back in to correct my understanding if I'm off... [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Mustang Forums
2011-2014 Mustangs
Engine/Tuning
Vp ms109
Top