How much timing are you guys running 93 with Meth able to run?
02-24-2012, 10:47 AM
#1
How much timing are you guys running 93 with Meth able to run? How much are you turbo guys getting away with on 93 pump and meth injection (80/20)? I haven't started pushing the timing envelope yet, but once I get my short times down thats where I am going to turn for more HP. I am currently at ~11.5* (setup is a s400/lq9).
Also, how much is the jump from 11-12 to say 15-16* worth?
Also, how much is the jump from 11-12 to say 15-16* worth?
02-24-2012, 10:52 AM
#2
First off I don't know anyone runing 80/20 meth mixture! But hey if it makes you feel better to add water to it, then I guess your fine then. But when I've been running it I still ended up in the 17* range depending on the car setup CR etc... every degree is going should see a decent gain until you get to a point were it won't gain much most I have seen don't ever pick up anything after 18-20* but most will do that on the dyno and then back it down a couple of degrees for saftey.
02-24-2012, 11:05 AM
#5
First off I don't know anyone runing 80/20 meth mixture! But hey if it makes you feel better to add water to it, then I guess your fine then. But when I've been running it I still ended up in the 17* range depending on the car setup CR etc... every degree is going should see a decent gain until you get to a point were it won't gain much most I have seen don't ever pick up anything after 18-20* but most will do that on the dyno and then back it down a couple of degrees for saftey.
02-24-2012, 11:18 AM
#6
On that Kenne Bell page they say:
"At KB , we set timing at 18° and boost at 9psi for 91 octane. 93 octane allows another 2psi or 2 – 3° spark but NOT both. Higher ECT, IAT and ambient temps will retard spark via the ECM and protect the engine from harmful detonation."
That seems a little bolder than most on a 10.7:1 ls3 but they are relying on the knock sensors.
"At KB , we set timing at 18° and boost at 9psi for 91 octane. 93 octane allows another 2psi or 2 – 3° spark but NOT both. Higher ECT, IAT and ambient temps will retard spark via the ECM and protect the engine from harmful detonation."
That seems a little bolder than most on a 10.7:1 ls3 but they are relying on the knock sensors.
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02-24-2012, 02:15 PM
#14
i know on my car i dont have knock sensors and once i push the envelope just gonna have to be careful. right now im running 15psi and 14 degrees of timing on plain old 93 octane.
02-24-2012, 02:44 PM
#15
OP, don't forget that the LS3 quoted by Kenne Bell has LS3 heads, which have a different chamber than typical cathedral port heads, so will have a slightly different timing curve (I know they tolerate more timing N/A, so I would expect to see a similarity boosted).
02-24-2012, 02:49 PM
#16
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My IAT temps on a 160mph pass are in the 110-120 range using a #10 and #15 nozzle.
At this power level I don't rely on the knock sensors-I run the car on the fat side ( you can always see a haze of smoke with the car going down the track) and check the strap on the plug.
02-24-2012, 04:26 PM
#17
On his car they do function sorta for a saftey factor, but I usually don't rely on them or run them on any of my car and haven't for a while. But if you looked at the knock sensors they weren't detecting any knock, but the car barley picked up any power from 18* to 20* so I believe we backed it down to 17* as that seemed to be the sweet spot etc... The plugs looked great etc...
02-24-2012, 08:21 PM
#20
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I pull timing based on IAT.
My IAT temps on a 160mph pass are in the 110-120 range using a #10 and #15 nozzle.
At this power level I don't rely on the knock sensors-I run the car on the fat side ( you can always see a haze of smoke with the car going down the track) and check the strap on the plug.
My IAT temps on a 160mph pass are in the 110-120 range using a #10 and #15 nozzle.
At this power level I don't rely on the knock sensors-I run the car on the fat side ( you can always see a haze of smoke with the car going down the track) and check the strap on the plug.