Pump Gas Turbo Fuel Question

[Bear North]

To run a pump gas turbo at 8 - 10lbs boost what is the proper fuel to use? Do I mix Race 112 with 91 octane with a 50/50 mix?

Does it all depend on the turbo kit?

Also I have heard a mix of 100LL with 91 octane can help with reaching the 8-10lbs levels.

Currently riding at 3000 - 7000ft.

Any helpful suggestions with correct fueling for these boost levels will help.

Thanks

 

[4mcntrls]

I rode from 2000-8000 last year, I used 1 gal of 112 and 4 gal of premium and never had an issue at all, I just thought it was cheap insurance.

 

[Dogmeat]

I rode from 2000-8000 last year, I used 1 gal of 112 and 4 gal of premium and never had an issue at all, I just thought it was cheap insurance.

I'm gonna be riding 8-12k this year with mine and I'm planning on doing a %20 112/91 mix.

That should give me a C8 rating of 95.2 .... I figure if I just plan on %20 consistently I otta be able to get away with just one fuel map using the EBC ...

Im gonna go with the %20 first than maybe try lower to see how it works, but Im gonna start on the safe side

 

[everytime5.9]

What sled are you planning to turbo? Which turbo kit/size of turbo? Every sled is different but if you narrow down your selection we can provide a better idea. Some pump gas kits might not be able to run those boost levels without maxing the injector duty cycle. Or even provide enough fuel from the stock pump at 3000ft. Again depending on the kit. Engine displacement also effects the required amount of octane. So what are you getting?

 

[Bear North]

2010 M8 Pump Gas

Future project of 2010 M8. Not sure of the kit yet. Looking the the Stage 2 Cutler kit. New to the topic of turbos so any helpful hints are welcomed.

I have read all good things about the big 4 turbo kits, Twisted, Cutler, Boondocker, & OVS.

I have heard if you can't reach at least 8lbs its better to just go all the way to race kit. Personally I think 8lbs will be just fine and perfect for boondocking.

Thanks

 

[harf69]

thats all you can get without using a setf secondary injectors ive got a friend that had a booni box and he maxed out the injectors at like 9lbs if your going to turbo and like power go all the way and start with it down i bought a sled that is already boosted and 12lbs is not enough never enough lol good luck

 

[kraftymike]

I ran an '08 M8 with the '09 BD PG kit for the last two years at 6-10k feet. I consistantly ran 8-9lbs of boost off 91 with an oz. of Octane Booster/gallon. Never hit the det. sensor once and never ran much over 85% duty cycle on my injectors. At those low elevations I would guess that I would have had to run about 50/50, 91/100LL to achieve the same numbers.

 

[M8Chris]

Great post!

Not trying to hijack. But I was wondering about my set up. I have a 2010 m8 gonna be putting a boondocker pump gas set up with an intercooler. Isn't 7-8lbs boost the max you can run? And what should I do about fuel? Throw in about 2 gallons of race fuel? I ride 6000-10,000 ft. I figured I'd set it at 7 lbs to be safe but would love to get 8lbs. Any input. Great post glad you brought this up!
Chris

 

[4mcntrls]

I was running 8-10 lbs, just have to watch your injector cycles. Just keep an eye on things and have a blast!

 

[SNOW JW]

It can depend on some things. With the proper intercooler you can squeeze more boost out of your octane as well as more hp per lb of boost.

Like others had said you can run out of injector so this is something to watch from time to time. With the BD box it records many max levels max charge temp, RPM, boost & your max duty cycle in a % base so this makes it easy to see how much more boost you can run before you run out of injector as well.

Pump fuel is also a huge variable if you get good pump fuel it's pretty easy to predict what you need to run but getting good pump fuel can be a hit and miss thing so I recommend a higher mix at 8lbs at 3000ft 50/50 would be a good place to start if you go up higher your mix ratio can go down. I like Av gas or 100LL so if you think about cost like in the states your not talking allot more $$ to mix a few more gallons. At about $1.25 more per gallon approx for a 50/50 mix your only looking at about $6-$7 more per ride then 100% pump gas.

 

[mynewuseddoo]

If you are figuring with the race gas mix being around a C8 95.2 octane, just go with AV gas 100LL. Its way cheaper and your octane is going to be 100 instead of 95. You will also have more money in your pocket too This is what I am going to be running in my CPC stage 2 at 8 PSI. There are other CPC riders on here that run that same setup. IMO if you're not running super high boost then stick with the AV gas and save your money.

 

[Bear North]

At 8lbs on the CPC Stage 2 you running mix or straight AV 100LL?

Thanks
Steve

 

[Rms Rydning]

At 3000ft the stock injector was out of fuel at 5,5psi.
Did use m1000 injectors and was able to run 6,5-7psi boost at 3000ft.

All stock i gess you might have be over 10000ft to be able to run 8psi...

The pumpgas kit performance was low compare to expexted when using this kind of money.

If you considder m8 pumpgas, go for a piped m1000 instead.
Or go for a racekit that you can modify to use on pumpgas with lower compession.

 

[backcountryislife]

I'm a bit higher, but I run just under 20% mix (sunoco 112 to non ethanol 91) for 10-15 PSI for 9k to 13k. We can run 9.5 psi on straight 91 at 11k. (Never tried higher) We don't turn it all the way up down low, highest I've run it at 9k is 13psi on that mix.

This is on a stage II cutler.

 

[knzee]

Good stuff. Do you have to make many clutching changes going from say 9.5 to 14 psi? How about changes to the fuel map for the same change. Can you get 15psi out of a cpc stage II or did you do some changes?

I'm a bit higher, but I run just under 20% mix (sunoco 112 to non ethanol 91) for 10-15 PSI for 9k to 13k. We can run 9.5 psi on straight 91 at 11k. (Never tried higher) We don't turn it all the way up down low, highest I've run it at 9k is 13psi on that mix.

This is on a stage II cutler.

 

[mynewuseddoo]

At 8lbs on the CPC Stage 2 you running mix or straight AV 100LL?

Thanks
Steve

Straight AV 100LL, locally paying about $1.35 per liter (cheaper than premium a couple years back). A buddy of mine can get it at between (as I have been told) $.99 and $1.02 per liter, just need to buy in volume. Riding about +/-6000 feet out here in the Shuswap/Revy region. A different buddy of mine was running the CPC stage 2 kit all last season at 5.5 PSI on Chevron 94 out here, it worked awesome!

 

[shawkins]

Any advice for an OVS kit. I have an 09 m8 non intercooled. Running 6000-10000. Planning on 8 psi right now on 91 octane.

 

[Pure Logic Tuning]

I think it is time to clarify what pump gas means. This means it runs on 91 pump gas only. The pump gas turbo with 91 octane should be kept at 5-6lbs. Then we have the fuel chemistry gas turbo kits that can be all over the board because what works for one person buying 91 octane pump gas and adding so much race gas always comes back to how good of pump gas are you getting and everyone is getting different 91 pump gas. This is why there is no good answer how much boost can I run on 91 pump gas depending on alltitude, when the question should be is how much boost can I run with the fuel I purchased today at at different alltitudes. The best option on a pump gas turbo is to plan on running 5-6lbs and no more to be safe. If you want to run more boost purchase AV fuel or race gas to always no you are getting the same octane rating. I think I will start a new product line chemistry gas turbo kits and then we can talk about mixing gas. When people talk about pump gas boost levals it needs to be on 91 pump gas only.

 

[backcountryislife]

Good stuff. Do you have to make many clutching changes going from say 9.5 to 14 psi? How about changes to the fuel map for the same change. Can you get 15psi out of a cpc stage II or did you do some changes?

Our kit is similar to the 2010 kit. It's a 2009 cutler stage II with a twisted BOV. I believe the 2010 kit comes this way.

Keep in mind that people talking about maxing the stock injectors are running BD PG kits, the two have little in common when it comes to what you can get out of the injectors. BD PG runs out a ways above what you can run on PG, but the cutler runs a different pump which allows it to run the stockers, but also go a decent ways higher without the need for an added set. There's a lot of misinformation from people that assume that all the kits go about things the same way.

Also take my altitude (10k minimum) into account as to why I'm able to hit 15 on 25% race safely. (still not maxxed out on fuel though) it'd be a whole different deal at 3k.

Edit:

To answer the other 1/2, I know we should change clutching, but honestly I just don't find the need to. It's clutched for about 10-11, but lower or higher I'm still seeing Rpm's within an acceptable range. If I had changed to a higher standard PSI that I was going to constantly run, I'd change. We usually run it at about 10-12, just don't need more than 12 most of the time.

(ok, you don't NEED more ever... but it's fun to hand it to a buddy at 15 & dare him to hold it open all the way up the hill!!)

 

[Radski30]

Oh, just run propane. That is as good as race gas at a pump gas price, and an m8 will produce 288.4 HP @ 14 PSI on propane.

LOL, I can't wait to see this thing in action.

But as for Pump Gas Turbo's, My friend ran his pump gas turbo @ 10 PSI all year on Maverik 91 octane, with no added race gas. We rode from 8000 ft to 10,000 ft all year long, and he never had a single issue. No sign of Detoing.

OVS, if you dispute this, I want you to know, that I believe you saw this thing in action in Tony's, and I know many others rode this sled...and I know that you will see it again this next year.

The kit was installed by Steve Stevens at North Star Adventures. He did a very good job, and the sled ran flawless all year.

I am a race gas fanatic. I love the smell, I love turning up the boost, and I just love paying the price for sonoco 116 or VP Import,
but I believe that having the capabilities of running low boost all the way up to 30 PSI is the only way to go. I don't like to limit myself...and I most certainly do not like the smell of propane, and I just could not imagine life with out race gas in my sled.

Pure Logic, when I was at the snow show, both of you told me that you would meet me in tony's to see the 300HP Propane sled in action.

I can't wait to see you there