Hey Guys
I did all the math for Octane rattings and they are as follows
I used the compression calculator from Rays.
http://www.turbofast.com.au/TFcompB.html
You will need the folowing specs-
Bore = 2.91"
Stroke= 2.28"
VE = 55-250hp, 66-300hp, 78-350hp
Compression Ratio = 10.1 with low comps
= 9.1 with low comps and .057" gasket
= 8.1 with low comps and .065" gasket
Boost = what ever level you would like to run
VE- Volumetric Effiency is ths
(5600 x HP x 100) / (10500 x ((4 x 999) / 16.4))
HP = desired horse power
Sea 6000ft
250hp - with low comps and .057" gasket - 15lbs boost = 95oct 91oct
300hp - with low compa and .057" gasket - 17lbs boost = 103oct 99oct
350hp - with low comps and .057" gasket - 22lbs boost = 116oct 112oct
Anyone with this configuration can safly run up to 15lbs boost on 92 octane pump fuel. I dont believe in running any lower octane than 92.
The rule is for every 3000 feet subtract 2 points
In the new 3k kit from MCX my head gask is .065 so this is mine @6000ft
I'm also told that the new vovlo kkk turbo can produce - 27lbs boost
250hp - with low comps and .065" gasket - 15lbs boost = 92 octane
300hp - with low comps and .065" gasket - 17lbs boost = 96 octane
350hp - with low comps and .065" gasket - 20lbs boost = 104 octane
375hp - with low comps and .065" gasket - 23lbs boost = 109 octane
400hp - with low comps and .065" gasket - 25lbs boost = 115 octane
Hope that this can help you with you fuel octane level probs.
took awhile to understand it all but make sense now.
thanx for all the help from this site too its great.
PS: These numbers are for race applications and are at wide open throttle so think about your ride style before you put high octane in and trail ride.
Also you dont want any after burn in the pipes and valves or turbo for that matter. be safe. a few points wont kill you but not too much.
I did all the math for Octane rattings and they are as follows
I used the compression calculator from Rays.
http://www.turbofast.com.au/TFcompB.html
You will need the folowing specs-
Bore = 2.91"
Stroke= 2.28"
VE = 55-250hp, 66-300hp, 78-350hp
Compression Ratio = 10.1 with low comps
= 9.1 with low comps and .057" gasket
= 8.1 with low comps and .065" gasket
Boost = what ever level you would like to run
VE- Volumetric Effiency is ths
(5600 x HP x 100) / (10500 x ((4 x 999) / 16.4))
HP = desired horse power
Sea 6000ft
250hp - with low comps and .057" gasket - 15lbs boost = 95oct 91oct
300hp - with low compa and .057" gasket - 17lbs boost = 103oct 99oct
350hp - with low comps and .057" gasket - 22lbs boost = 116oct 112oct
Anyone with this configuration can safly run up to 15lbs boost on 92 octane pump fuel. I dont believe in running any lower octane than 92.
The rule is for every 3000 feet subtract 2 points
In the new 3k kit from MCX my head gask is .065 so this is mine @6000ft
I'm also told that the new vovlo kkk turbo can produce - 27lbs boost
250hp - with low comps and .065" gasket - 15lbs boost = 92 octane
300hp - with low comps and .065" gasket - 17lbs boost = 96 octane
350hp - with low comps and .065" gasket - 20lbs boost = 104 octane
375hp - with low comps and .065" gasket - 23lbs boost = 109 octane
400hp - with low comps and .065" gasket - 25lbs boost = 115 octane
Hope that this can help you with you fuel octane level probs.
took awhile to understand it all but make sense now.
thanx for all the help from this site too its great.
PS: These numbers are for race applications and are at wide open throttle so think about your ride style before you put high octane in and trail ride.
Also you dont want any after burn in the pipes and valves or turbo for that matter. be safe. a few points wont kill you but not too much.
Nice post
SuperStroker!
Pro
Devin>>>>>Excellent, Excellent Stuff!
This is the kind of info that helps everyone learn, even the companies selling turbos for snowmobiles!
Fact is the turbo companies should include this type of info in the instructions...maybe they do?
The only think that is suspect here is the VEs. I think they should be slightly higher for this engine/valve train. Anyway, probably wouldn't change much.
Devin, great stuff!
This is the kind of info that helps everyone learn, even the companies selling turbos for snowmobiles!
Fact is the turbo companies should include this type of info in the instructions...maybe they do?
The only think that is suspect here is the VEs. I think they should be slightly higher for this engine/valve train. Anyway, probably wouldn't change much.
Devin, great stuff!
The VE maybe .5 percent or so out due to the 5 valve configuration in the RX1. But has to Be very close.
The turbo manufacturers are not providing this info in the instructions, let alone tell us to run upwards of 20lbs boost.
They feed us #'s that are so far in the safe zone to cover there asses.
Another thing guys is if you are running these high performance machines and playing with horse power number's in the 300 -400, then you must have the instruments to see what the motor is doing. ex. boost, exhuast temp, fuel pressure, oxygen/air meter, oil temp sensor for turbo, RPM, speedo, water temp, altitude meter. You need to know as much as possible about the many variables that make your system run perfect.
Most of the information that I have gathered for all of my knowledge on turbo's and RX1 have come from the other people in this site. The stupid question is the one not asked.
Thanx to all the people for this site
KEEPIN YAMMI OUT ON TOP
The turbo manufacturers are not providing this info in the instructions, let alone tell us to run upwards of 20lbs boost.
They feed us #'s that are so far in the safe zone to cover there asses.
Another thing guys is if you are running these high performance machines and playing with horse power number's in the 300 -400, then you must have the instruments to see what the motor is doing. ex. boost, exhuast temp, fuel pressure, oxygen/air meter, oil temp sensor for turbo, RPM, speedo, water temp, altitude meter. You need to know as much as possible about the many variables that make your system run perfect.
Most of the information that I have gathered for all of my knowledge on turbo's and RX1 have come from the other people in this site. The stupid question is the one not asked.
Thanx to all the people for this site
KEEPIN YAMMI OUT ON TOP
