Is there a rule of thumb scale on the how much to retard the advance based on a certain IAT? The defaults seem to very require a really high IAT before retarding starts. Reason for asking is now that summers starting (in Australia!!) my fibreglass bodied car is getting quite hot .. and IAT are suffering. GAIR helps.. but I am pinking at high IAT.. (over 50 deg C).
I'm looking at getting some defaults to test without too much testing (aka risk to destroying my engine)..then I can fine tune.
Advance retard on high IAT
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Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0). For tuning/troubleshooting questions, please attached a datalog and your MSQ file to your post.
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
Advance retard on high IAT
Megasquirted TVR Griffith
Re: Advance retard on high IAT
I generally start with 1° retard for every 15°F. This, of course, assumes it's all tuned for spark correctly first to Minimum Timing for Best Torque, and is only a guide for equivalent conditions. Humidity, fuel, boost, and a hundred other factors can influence the correct amount. If the engine itself is also getting hotter, that's a whole other issue and relates to CLT retard. Hope that helps.
David
David
-=If it was easy, everyone would do it.=-
Re: Advance retard on high IAT
David.. yes that's great thanks. From what IAT would you start retarding?
Megasquirted TVR Griffith
Re: Advance retard on high IAT
From wherever it was tuned correctly. This is a good place to see the negative effects of hot underhood air at low speeds, and why cold air induction is important for a number of reasons. Of course, hot air from boost is in the same category.
David
David
-=If it was easy, everyone would do it.=-