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Meth failsafes
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PostPosted: Mon Dec 14, 2009 12:15 am 
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Newb
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Joined: Wed Nov 18, 2009 12:59 pm
Posts: 23
Location: Fayetteville, NC
from IWSTI.com http://www.iwsti.com/forums/2-5-liter-l ... rbo-4.html

Quote:
A good alky system (like HFS-6) with a flow based fail-safe can work great, and cause no det, even on an alky failure! How? Built in relay triggers test-mode connector to ground. What does this do?

example:

-running 26 psi at 12:1 AFR with 600 cc/min of 75% meth mix and Dynamic Advance at 7
-alky fails at 5000 rpm
-flow based fail-safe detects loss of flow, and triggers a ground signal to test-mode connectors
-DAM (or IAM) drop to 0 immediately, this causes:

* ignition advance reduced 7 degrees
* boost dropped to 15 psi (WG spring value)
* AFR map switched over to failsafe map, which runs AFRs in the 10s

You keep on running at WOT, with a huge loss in power, but no detonation. (just like a conservative pump tune)

Obviously your tuner has to tune with this in mind.
iwsti

does this sound about right? robbie is putting a failsafe in my STi while he is reinstalling the meth, wanna make its the most fail safest possible, LOL :D

robbie, youre the bomb. i think you explained this to me at the shop, its just that most of it was flying over my head at the time.


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PostPosted: Mon Dec 14, 2009 12:15 pm 
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Joined: Wed Jun 13, 2007 10:42 pm
Posts: 4395
Location: Fayetteville, NC
Some systems come with built in failsafes but some like mine (SMC) dont. I just look at the little red LED and when it comes on I come off the gas!

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PostPosted: Tue Dec 15, 2009 12:16 pm 
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Joined: Wed Nov 18, 2009 12:59 pm
Posts: 23
Location: Fayetteville, NC
yeah but they are talking about hooking it up to test mode connectors so that it automatically goes to 'limp mode'. i dont know enough about ins and outs of meth injection to know what thats supposed to look like.


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