Octane boost thoughts
Discussion
I would be interested on peoples thoughts as to why and maybe where I can improve my tune.
I was racing at York last weekend. The TVR was quite consistent despite the weather and was running terminal speeds of 114.5 mph.
On the Monday a friend offered me half a bottle of Royal Purple octane boost so I dumped it in my tank which had about 15 litres of Vpower in.
First run I ran 114.8, then 116.2
My engine is a 5.0 with a solid cam and fairly high CR of 11:1
Do we think its crying out for higher octane?
Maybe I could add a couple degrees advance but its set at 34 degrees already.
What do we think?
I was racing at York last weekend. The TVR was quite consistent despite the weather and was running terminal speeds of 114.5 mph.
On the Monday a friend offered me half a bottle of Royal Purple octane boost so I dumped it in my tank which had about 15 litres of Vpower in.
First run I ran 114.8, then 116.2
My engine is a 5.0 with a solid cam and fairly high CR of 11:1
Do we think its crying out for higher octane?
Maybe I could add a couple degrees advance but its set at 34 degrees already.
What do we think?
No worries I don't intend to stretch timing etc.
I did have to add 3 points to the top of the fuel map on Sunday to get the AFR down as it was a tad lean on WOT at the top end.
What I would like to do is get it on Surrey rolling road soon if I can. I think it's now producing good numbers.
What's it worth do we think? I got a lot of blood sweat and tears in this now.
I did have to add 3 points to the top of the fuel map on Sunday to get the AFR down as it was a tad lean on WOT at the top end.
What I would like to do is get it on Surrey rolling road soon if I can. I think it's now producing good numbers.
What's it worth do we think? I got a lot of blood sweat and tears in this now.
Try this derek, just round the corner from your sister
http://www.vpracingfuels.com/
ps more bang = more heat beware. Sorry see you already there. Much better to have more oxygen as in VPfuel than an over the counter additive. Do you know if the octane booster adds more oxygen when mixed with pump fuel, if not, it is a no brainer. You would probably need a remap on racing fuel.
http://www.vpracingfuels.com/
ps more bang = more heat beware. Sorry see you already there. Much better to have more oxygen as in VPfuel than an over the counter additive. Do you know if the octane booster adds more oxygen when mixed with pump fuel, if not, it is a no brainer. You would probably need a remap on racing fuel.
Edited by 77racing on Wednesday 4th May 13:04
I used to add the Millers octane boost to super unleaded on the little Fiat engines I used to tune when "blitz racing". Ive never managed to get knock detection to work on the RV8 when trying to advance the timing to its peak point, but Mark Adams did pass comment that its really hard to make the RV8 knock unless the mixture is too lean, and anyway by time you have knock you are well past peak torque, so ideally you want to put the high octane stuff in, and head for the rollers to optimise the timing and torque. The later P38 lucas GEMS system does have tuned knock sensors on the Rv8 block so it must be possible to detect, Ive just failed to detect it either by ear, or after market knock detectors using P38 sensors.
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