Would buying 112 octane gas help my car run a bit quicker ? Right now running 94 octane still pings once in a while if it's going up a hill under 2300 rpm , pings a lot when I put in 91 octane . Compression is right around 10 . 1 .
What kind of gas do you run at the track ?
- Thread starter jerry6
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SRT_DSTRHOLC
Well-Known Member
Or can switch to E85
or back your timing off about 3 - 4 degrees.....
That's what i figure , probably 106 octane would be good , so I'd back the timing 4-5 degrees too , right . Do you think a 50/50 mix of 94 /112 would be good ?
No such thing around here .
SRT_DSTRHOLC
Well-Known Member
Well.................nvm then. How about 94 with water/meth injection? And why such high octane? Is it for your car that runs 13s??
Yes , steel heads .
805moparkid
Slant and AFX Guy
whats your dynamic compression and cylinder pressure? I have a 10:1 motor with about a 7.9 dynamic comp and she does just fine at 100oct (50/50 mix of pump 91 and 110 leaded)
pettybludart
Well-Known Member
I would try mixing a liter of Boost additive first.My friend uses it with his 422c.i W2 headed pump gas stroker.Runs 10.62@125mph in a 69 Dart.Worth a try and cheaper.
SRT_DSTRHOLC
Well-Known Member
so..I have 10.1 static and 8.8 dynamic and run on 91 with close chambered heads. I would say cylinder pressure plays a big part in it all.. Also this engine was built by Brian at IMM. 33 degrees timing.
Cylinder pressure , what is yours ? My motor was built 6 years ago so I am not sure on exact compression , but do remember it took forever to get it to run without pinging , compression was over 10.1 I know that . Each cylinder was between 192 and 195 lbs , that I remember . I put in 90 octane once by mistake and it ran like crap , ran on when I shut down , constant ping as soon as I hit the pedal .
I'll try to find the build sheets so I can give better numbers . Memory is not great , between getting old and being put under general anaesthetic 5 or 6 times in the last 5 years I'm lucky if I remember my name .
I figure 100 octane would be just about perfect for the motor . I'm going to find the build sheet so I know exactly what the compression is . I do remember it was over 10.1 and that bothered me at the time .
I tried octane boost , absolutely worthless , at least the junk I tried . You know of a good product I could try .I would try mixing a liter of Boost additive first.My friend uses it with his 422c.i W2 headed pump gas stroker.Runs 10.62@125mph in a 69 Dart.Worth a try and cheaper.
SRT_DSTRHOLC
Well-Known Member
I have not checked pressure yet. Fresh engine with no miles just idling time. My camshaft does help being 251-260 @50. Maybe your camshaft is small for your setup?
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