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airtite
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« Reply #30 on: October 04, 2013, 03:44:09 AM »
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Next time you are tuning it install actual EGT gauges, work on KFLBTS so that it keeps EGT's low.
And I would request richer LAMFA across the board as well, it should make more power at 0.82-0.84 than it does at 0.88, and then use BTS to go richer from there to keep EGT's down.
wish I had access to actual egt probes unfortunately with me being a hobbist I dont. I will apply what you say and see how things go. |
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krazydbiker
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« Reply #32 on: October 04, 2013, 05:26:07 AM »
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fair enough I never logged any 6th gear runs, surely if the EGTS were that high the damage would be on the exhaust side of the piston and not on the inlet side and if it was EGTs surely the damage would have been uniform across all pistons on not just those 3?
Pistons almost always melt on the intake side... I'm assuming this would be due to a extremely hot cylinders igniting the incoming fuel air.. From there it probably goes downhill fast... I would check fuel pressure after its all fixed but it looks more like a tune issue.... how do the other plugs look right now? I'm willing to bet those were hot also... Sucks.. I need to invest in better monitoring also but I'm relatively conservative with my fueling to avoid issues.. |
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airtite
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« Reply #33 on: October 04, 2013, 06:19:18 AM »
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no heat damage to any of the other plugs in fact they all looked pretty oiled up after the failure.
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krazydbiker
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« Reply #34 on: October 07, 2013, 06:39:51 PM »
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hard to say  , if it were me i would tone the tune down after the rebuild and monitor fuel pressure when WOT |
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jibberjive
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« Reply #35 on: November 23, 2013, 04:10:03 AM »
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I would monitor both fuel pressure and real EGT's with a thermocouple(s), not relying on the modeled EGT values. Also, a 3-gear pull from 3rd through 6 will result in much higher EGT's than 3rd alone. Even if you had real EGT values from previous 3rd gear logs, those wouldn't necessarily reflect the EGT in 6th gear after rowing through the gears.
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airtite
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« Reply #36 on: January 17, 2014, 03:20:46 AM »
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OK rebuild done 500km under its belt and engine going strong, reverted to stock file just with changes for the 440cc injectors temin/tvub/krkte. 4th gear run logs attached any input advice on a "safer" approach to a tune for this car is welcome?
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dream3R
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« Reply #37 on: January 17, 2014, 03:37:12 PM »
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Stock tunes are generally lean no? I'd at least enrich it!
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airtite
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« Reply #38 on: January 20, 2014, 01:22:17 AM »
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Next time you are tuning it install actual EGT gauges, work on KFLBTS so that it keeps EGT's low.
And I would request richer LAMFA across the board as well, it should make more power at 0.82-0.84 than it does at 0.88, and then use BTS to go richer from there to keep EGT's down.
This is the stock lamfa/bts. Enriching lamfa across the board so lowering all values by about 5%? and do teh same for bts as a starting point? |
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ddillenger
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« Reply #39 on: January 20, 2014, 08:38:36 AM »
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If it were me, I'd target an AFR of 11.5 until you know you can safely lean it out. In addition, I'd reduce timing at peak load and high RPM.
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Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your experience!
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jibberjive
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« Reply #40 on: March 22, 2014, 03:24:32 AM »
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Yeah, take it really conservatively, and make small adjustments. Any updates?
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airtite
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« Reply #41 on: April 23, 2014, 05:20:14 AM »
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Yeah, take it really conservatively, and make small adjustments. Any updates?
I tried with lower bts and fueling and the car was horrible, I am busy having the blower rebuilt new bearings/seals/rotor coating etc which is taking a bit longer than normal. |
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engine_nerd
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« Reply #42 on: May 08, 2014, 09:48:53 PM »
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That thing was just too lean.
With the right plugs / coils / etc it should chug right through an 11.5:1 or even 11:1 mixture without any issues. Hell, we're firing a 900 bhp bonneville 1.8t cylinder at those mixtures with stock coils, because we are concerned about exactly the kind of heat issue you had there. 40-42 psi and it doesn't misfire a bit.
Staying in it for minutes on end is FAR different from a thermal POV then just a few quick 3rd or even 4th gear rips.
Also, that doesn't look anything like knock to me- what's the quench pads on the head look like? Perfect probably...
I also vote for tuning it richer. You really are gaining nothing at all by being so lean. Some engines won't like being in the 10.x but that's really getting pretty damn rich anyways.
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