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  #11  
Old 12-04-2011, 07:52 PM
aminga aminga is offline
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Location: Lacey's Springs, AL
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I wouldn't use the MAF to drive the Alky. At pretty low boost levels the stock maf is maxed out.
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Alan Minga
New Build DONE!
109 Block with stock crank and rods, Diamond Forged pistons, T&D 1.65 rockers, FTSS 206/210 roller, Ported Heads, TA6262 DBB, PTC 2800 LU
TT 6.1 Chip, ISAC Alky, Maf Translator and PLX Wideband,

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  #12  
Old 12-04-2011, 08:14 PM
owen owen is offline
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Is that why my LV8 seems to peak along with the MAF at around 255?
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  #13  
Old 12-13-2011, 12:33 PM
aminga aminga is offline
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http://www.turbobuick.com/forums/alc...-tracking.html
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Alan Minga
New Build DONE!
109 Block with stock crank and rods, Diamond Forged pistons, T&D 1.65 rockers, FTSS 206/210 roller, Ported Heads, TA6262 DBB, PTC 2800 LU
TT 6.1 Chip, ISAC Alky, Maf Translator and PLX Wideband,

Lacey's Spring, AL

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  #14  
Old 12-16-2011, 09:43 PM
owen owen is offline
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Thanks for the Alky, Meth info. I did some dyno pulls last weekend, and I see some knock retard, but no reduction in spark advance to match. Should I see that? Also,my A/F seems really lean at 2000rpm leading up to the full throttle portion of the pull.
Thanks for the input
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  #15  
Old 12-21-2011, 02:08 PM
TurboBob TurboBob is offline
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I can't see the Powerlogger stuff on this computer (its a linux machine), but on the Buick stuff, the knock retard does not show on the spark advance trace.

So if the spark advance trace shows 22 degrees, and you have 6 degrees of knock retard, then your actual timing is 16 degrees.

Bob
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  #16  
Old 12-21-2011, 02:51 PM
owen owen is offline
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Thanks, that explains alot. I have read that some amount of knock retard is "normal" under full load. Is that true, and if so, at what point is it a cause for concern? i.e.-need better fuel, too much boost, etc.

Owen
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  #17  
Old 12-21-2011, 03:00 PM
TurboBob TurboBob is offline
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The higher the power level, the more dangerous knock is.

On the street, with relatively low boost, a little knock retard here and there is not unusual. As long as it is not audible, and the knock retard is just a few degrees, then you are probably fine.

If the knock is audible, I would be concerned.

Anytime you are running higher boost, higher octane, and/or alky, knock is something to worry about and I would suggest "0" knock should be the goal.

Bob
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  #18  
Old 12-22-2011, 02:48 PM
owen owen is offline
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It seems like I get 3 degrees with race fuel, and up to 10 with 91 octane. I never hear any knock, but the car is fairly loud otherwise. This is with 20# boost, 48lb injectors running at 100% duty cycle.
Thanks for the help
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  #19  
Old 12-29-2011, 01:28 AM
TurboBob TurboBob is offline
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it may be false knock, what is the afr, spark advance, and what brand/type of fuel?


Bob
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  #20  
Old 12-31-2011, 05:53 PM
owen owen is offline
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I see knock (3-5), with 109 race fuel, 23 degrees spark advance, 10.28 A/F, 19 lb boost, at 5400 rpm. My fuel pressure was around 65 lbs, but my fuel pressure sender is not connected to my Powerlogger. I would like to do that, but don't know how. My sender unit is for 0-150 psi, 3-162 ohms.

I want to make sure I don't have detonation issues before I go back on the dyno and go up to 26lbs boost.
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