Timing suggestions on my e85 built engine
06-20-2013, 09:14 AM
#1
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Timing suggestions on my e85 built engine
So I switched to a smaller 6265 after my 6765 took a dump. I'm having to rebuild my fuel and timing maps due to the lower rpm boost compared to the larger turbo. My e85 friends on other platforms say I'm not running enough timing and I think they are right but I was curious input from some others.
9:1 cp pistons
ported heads
tomei 264 cams
e85
6265 turbo
That's about all I can think important for determining what I'm asking.
So some symptoms I'm noticing is a misfire when building boost. When I checked logs I noticed I'm in some cells I never was before with some low timing and I'm thinking the low timing is causing some misfire. This happened when first tuning my e85 and when I increased timing it went away. So I've included 3 images showing what the timing was when I spooled and it misfired, then the comparison showing how much I increased it then what the timing numbers are after I increased it. I have the 3000 rpm and 14psi cell highlighted because that was an area of misfire.
If anyone cares to chime in or even upload some images of their timing maps in that area. Preferably guys on race gas or e85 so it will be similar. I saw some other maps that were in the single digits in that area which just seems low to me for that boost level and rpm on e85.
*There was no knock during the misfire event on my logs.
9:1 cp pistons
ported heads
tomei 264 cams
e85
6265 turbo
That's about all I can think important for determining what I'm asking.
So some symptoms I'm noticing is a misfire when building boost. When I checked logs I noticed I'm in some cells I never was before with some low timing and I'm thinking the low timing is causing some misfire. This happened when first tuning my e85 and when I increased timing it went away. So I've included 3 images showing what the timing was when I spooled and it misfired, then the comparison showing how much I increased it then what the timing numbers are after I increased it. I have the 3000 rpm and 14psi cell highlighted because that was an area of misfire.
If anyone cares to chime in or even upload some images of their timing maps in that area. Preferably guys on race gas or e85 so it will be similar. I saw some other maps that were in the single digits in that area which just seems low to me for that boost level and rpm on e85.
*There was no knock during the misfire event on my logs.
Last edited by binder; 06-20-2013 at 09:16 AM.
06-20-2013, 05:36 PM
#3
i would honestly agree with it being kind of low jeff, cant remember if ive ever been in that cell or not at the moment(i cleared all my logs because im waiting for my proefi to come in) but i know in the same area im running about double your timing on 92 with 8:1 compression(15.8@14.5 psi which i know i have hit, and 14.2@18.1 psi) no knock though, most of the knock i have ever had has been on the lower end in vaccum- about 10 psi and pretty sure that was phantom knock.
06-20-2013, 05:47 PM
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That's what I thought. I was surprised to see single digits on some e85 maps. The bonus of e85 is also the downfall when tuning: hard to get knock. So I'll need to get on a dyno and watch the tq curve to find out if I'm advancing it too far and losing power. Unfortunately there isn't a dyno to rent around here in indiana.
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