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Too much boost

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#1
Who‘s running 2.65 upper an 9% lower on race fuel 100-102 oktan...
How much boost is it ???

Diabolo Tune with PCM and 1100 DW injectors available

We have pump gas ⛽️ with 100 oktan (Shell) and 102 (Aral) here in Germany

If no one, what’s the max upper I can go with 9%lower on 102 pump gas??
 

Phast Hemi

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#2
Hello, does the 100 and 102 octane fuel you have access to contain lead?
 
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Thread Starter #3
no unlead
 

Phast Hemi

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#4
That's a lot of boost for that fuel. I would start with a 3.10 upper and your lower and datalog for knock. You may be able to work your way up to a 2.85 but I would log it first with the bigger upper pulley.
 

cole3986

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#5
It is a canned tune meaning that it cannot be adjusted, correct? If so, I agree with Simon, data log and sneak up on it looking for knock in the logs.
 
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Thread Starter #6
It is a canned tune meaning that it cannot be adjusted, correct? If so, I agree with Simon, data log and sneak up on it looking for knock in the logs.
no, it is fully adjustable... PCM is unlocked for diabolo and we tune it by hand
 

cole3986

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#7
Well that changes things, you could run the combination pull timing and sneak up on with timing (add timing until you get knock). My gut is that it is not enough octane to run optimum.
 

oilburner

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#8
Who‘s running 2.65 upper an 9% lower on race fuel 100-102 oktan...
How much boost is it ???

Diabolo Tune with PCM and 1100 DW injectors available

We have pump gas ⛽️ with 100 oktan (Shell) and 102 (Aral) here in Germany

If no one, what’s the max upper I can go with 9%lower on 102 pump gas??
do you measure octane the same as we do ?.......... r+m divided by 2 = octane
 
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Thread Starter #9
do you measure octane the same as we do ?.......... r+m divided by 2 = octane
whats r + m ?? our pumpgas is 100 octan by shell and 102 octan by Aral
 

oilburner

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#10
whats r + m ?? our pumpgas is 100 octan by shell and 102 octan by Aral
2 different methods for testing octane. R is short for research an M is for motor. different operating conditions for testing . so they take those numbers from each test method add the 2 together an divide by 2 to get the octane #. I think you will find your octane number is calculated different than in north America. so hard to compare our octane rating to yours unless we know the method your country uses.
 

oilburner

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#11
in other words our 93 could be equal to your 100 depending how they test for octane.
 

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#12
The 110 here, Fl, is leaded.
 
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#13
Here in Europe(I'm in Stuttgart), the octane is calculated by RON and generally listed at the pump by the RON number...Shell V100 has a RON of 100 or US equivalent of 94 while Aral 102 has a RON of 102 or US equivalent of 95.

Thats the way I understand it....
 

parttimer

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#14
Yes, the US octane rating is different than other countries.
 
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#15
Here in Europe(I'm in Stuttgart), the octane is calculated by RON and generally listed at the pump by the RON number...Shell V100 has a RON of 100 or US equivalent of 94 while Aral 102 has a RON of 102 or US equivalent of 95.

Thats the way I understand it....
If this is the case, that will be way too much pulley for the octane level. You will need a larger one to run safely.
 

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