max boost on 94 octane? where to find low comp domes? or machine?

[Octanee]

Hey guys, just curious, what's the max safe boost for 94 octane on say a 2012 pro? Anybody offer low compression domes? If not, can I machine my factory ones? increase the squish area or??? I don't need anything billet or fancy, just would like to run pump gas if possible overall, or depending on price what will 50/50 with av gas get me? 8#? Thanks.

 

[JJ_0909]

Hey guys, just curious, what's the max safe boost for 94 octane on say a 2012 pro? Anybody offer low compression domes? If not, can I machine my factory ones? increase the squish area or??? I don't need anything billet or fancy, just would like to run pump gas if possible overall, or depending on price what will 50/50 with av gas get me? 8#? Thanks.[/]

Dependent on...

1) Elevation. 94 will push 7psi at 10,000 feet no problem. Much less at sea level

2) Timing. How much timing was pulled from the map? If you pull gobs of timing, you can end up pushing pretty big boost numbers on pump gas (ish)

3) Charge Temps. If charge temps are on the higher end of "acceptable" you'll want to keep your boost in check, all other things considered, on pump gas.

So long story short, the answer to your question is "depends!".

 

[Octanee]

Hey guys, just curious, what's the max safe boost for 94 octane on say a 2012 pro? Anybody offer low compression domes? If not, can I machine my factory ones? increase the squish area or??? I don't need anything billet or fancy, just would like to run pump gas if possible overall, or depending on price what will 50/50 with av gas get me? 8#? Thanks.[/]

Dependent on...

1) Elevation. 94 will push 7psi at 10,000 feet no problem. Much less at sea level

2) Timing. How much timing was pulled from the map? If you pull gobs of timing, you can end up pushing pretty big boost numbers on pump gas (ish)

3) Charge Temps. If charge temps are on the higher end of "acceptable" you'll want to keep your boost in check, all other things considered, on pump gas.

So long story short, the answer to your question is "depends!".

Good point I know about those variables and forgot to mention that., as far as I know, probably stock timing, elevation is 5-8k feet, usually 5500-6k,often. And charge temps, not sure, it's a water to air kit. It's a sled I'm looking at buying.

 

[MrIQR]

who's kit? What features?

from what you've told us and taking a guess 50/50 @ 8lbs would av would be very safe, i can get away with 50/50 at 10lbs with my set up 7k-ish.

If you haven't ran av before you'll be surprised how easy it is to get and it's cheap right now for most of us($3.99/gal) so why not run it straight and crank the boost?

 

[aj1180]

I agree with Mriqr. Good gas is cheap insurance. I'm running 50/50 Sunoco 112 and 92 at 7k plus at 11 lbs and never had a problem. I'm going to try straight av next trip as I'm running out of 112.

 

[Octanee]

Thanks for the info guys, It's a boost it turbo kit. I'll End up getting me some av gas and going 50/50 then, do you mix with 91 pump gas? I can get 94 here but of course it's a chunk higher than 91, and yes I got thinking, price wise above 94 av gas is like ~40C a liter more, so why invest in some lower comp heads which It looks like are ~400$, it'll take a long time of fuel price savings to ever pay for the head its self anyways.

 

[JJ_0909]

Thanks for the info guys, It's a boost it turbo kit. I'll End up getting me some av gas and going 50/50 then, do you mix with 91 pump gas? I can get 94 here but of course it's a chunk higher than 91, and yes I got thinking, price wise above 94 av gas is like ~40C a liter more, so why invest in some lower comp heads which It looks like are ~400$, it'll take a long time of fuel price savings to ever pay for the head its self anyways.

Honestly, unless you are a tuner or talk to the turbo company yourself, changing compression can screw up a lot of things (yes, even lowering it). Probably won't but might.

I'd just talk to the kit builder and run what they intended.

 

[MrIQR]

^he's right, a quick phone call would probably answer all your questions.

when i mix 50/50 it's with av and 92 non eth.

 

[aj1180]

Go 60/40 av and 91. Should be plenty safe. The additional benefit of av is that it has excellent shelf life. I store all my small engines with av or race fuel before putting them away. It works great

 

[Octanee]

Thanks for replies. I'm buying it from boost it and If I remember right he said 25% race. And rest pump gas for 7#. I know what lower the comp can do and such, can make it feel a bit lazier of. An engine, but upon thinking about it it makes sense to just get av gas, at least it does store well as mentioned. I have used it in the past on another snowmobile I had.

 

[meathooker]

Hey guys, just curious, what's the max safe boost for 94 octane on say a 2012 pro? Anybody offer low compression domes? If not, can I machine my factory ones? increase the squish area or??? I don't need anything billet or fancy, just would like to run pump gas if possible overall, or depending on price what will 50/50 with av gas get me? 8#? Thanks.[/]

Dependent on...

1) Elevation. 94 will push 7psi at 10,000 feet no problem. Much less at sea level

2) Timing. How much timing was pulled from the map? If you pull gobs of timing, you can end up pushing pretty big boost numbers on pump gas (ish)

3) Charge Temps. If charge temps are on the higher end of "acceptable" you'll want to keep your boost in check, all other things considered, on pump gas.

So long story short, the answer to your question is "depends!".

dont forget # 4) - what turbo? 7 lbs out of a gt2860 is different that 7lbs out of a gtx2860 is different that 7 lbs out of a gt3882 and so on .....

 

[sledhead9825]

Thanks for the info guys, It's a boost it turbo kit. I'll End up getting me some av gas and going 50/50 then, do you mix with 91 pump gas? I can get 94 here but of course it's a chunk higher than 91, and yes I got thinking, price wise above 94 av gas is like ~40C a liter more, so why invest in some lower comp heads which It looks like are ~400$, it'll take a long time of fuel price savings to ever pay for the head its self anyways.

If your buying a Boost-it sled from Neil, he will have all the correct answers. Talk to Neil or TJ. Taking advise on here about that sled is crazy. Sorry boys I had a Boost-it sled. There turbo kits are awesome and make great power. Listen to the boys at Boost-it. They have spent countless ours tuning and testing there product and are very passionate about what they build. Get ready to kick A$$...

 

[diamonddave]

If your buying a Boost-it sled from Neil, he will have all the correct answers. Talk to Neil or TJ. Taking advise on here about that sled is crazy. Sorry boys I had a Boost-it sled. There turbo kits are awesome and make great power. Listen to the boys at Boost-it. They have spent countless ours tuning and testing there product and are very passionate about what they build. Get ready to kick A$$...

Agree. And Pump 94 octane in BC is highly oxygenated and is a garbage fuel!!!! Go with Av and if you must mix with lower, then mix with Pump 91.

 

[JJ_0909]

dont forget # 4) - what turbo? 7 lbs out of a gt2860 is different that 7lbs out of a gtx2860 is different that 7 lbs out of a gt3882 and so on .....

Very good point. CFM (volume of air being flowed) is VERY important.

 

[snowcheck163]

I have a low comp head for that. If your still interested. I don't want it.

 

[roughrider99]

Good point I know about those variables and forgot to mention that., as far as I know, probably stock timing, elevation is 5-8k feet, usually 5500-6k,often. And charge temps, not sure, it's a water to air kit. It's a sled I'm looking at buying.

Hey octane, on my turbo pro I've been successfull running 6lbs 91 pump gas on our area, made my own kit but it's 2860 water to air intercooled with a boost it controller. I ended up running 10lbs on av gas since it was only around 50-60 cents a liter more.

 

[Octanee]

Thanks for the replies and info guys.

Hey octane, on my turbo pro I've been successfull running 6lbs 91 pump gas on our area, made my own kit but it's 2860 water to air intercooled with a boost it controller. I ended up running 10lbs on av gas since it was only around 50-60 cents a liter more.

Thanks for the info! 6# on 91... Well the sled I got is supposedly running 7, mind you no gauges so I don't know. And running 94, so I probably should be more than safe. However most riding elevation here in cranbrook up Lumberton is about 5k-6500 feet. How about in Fernie area?

I got the sled and running 37%av and rest 94 it did throw a det code but the clutching is way off, so I got to tune that, I've been told if it revs too fast and hits the Rev limiter it throw the det code. If I'm slow on the throttle it's fine just got to watch the rpm. Hopefully this weekend I'll have it clutched right. I have art screws but didn't know how long the clutch weight arms are so I didn't put much in there but I see I can load them right up

 

[roughrider99]

All fernie area is about the same I rarely hit 7k usually 5000-6500. what fuel controller you got?

 

[Octanee]

All fernie area is about the same I rarely hit 7k usually 5000-6500. what fuel controller you got?

Oh ok so yeah same elevation, it's a boost it kit so their xic controller.

Today I got my clutching finally zero'd In, put like probably 5L of av and rest 94 octane, sled ran good, at lower elevation probably 4800 feet it didn't throw the code but then later in the day a bit higher up I hit the gas and she threw the det code. Maybe just the perfect throttle position causing more advanced timing in the sled, I'm not sure,

I'm sure I can just run straight 94 pump if I really wanted to. but to be safe I won't since the sled doesn't have a boost gauge so I really don't know what it's running pressure wise. they told Me it was set for 7#....

 

[sledhead9825]

Oh ok so yeah same elevation, it's a boost it kit so their xic controller.

Today I got my clutching finally zero'd In, put like probably 5L of av and rest 94 octane, sled ran good, at lower elevation probably 4800 feet it didn't throw the code but then later in the day a bit higher up I hit the gas and she threw the det code. Maybe just the perfect throttle position causing more advanced timing in the sled, I'm not sure,

I'm sure I can just run straight 94 pump. the sled doesn't have a boost gauge so I really don't know what it's running pressure wise. they told Me it was set for 7#....

What did Boost-it say you should run for octane, with 7 lbs at 6000 ft ? Listen to them. With the XIC box they don't have the timing pulled. You start hitting det a lot and its going to cost you a engine.