How bad is it when you hit the det sensor???

[M1000Mod162]

I need a little help guys! I have a 2010 m8 with a bd pg non Ic turbo! Im trying to run 8.5-9.5lbs boost but I seem to be hitting the octance sensor every now and then especially when it gets hot! The motor is completly stock! Ive been running straight av gas in it! I was thinking Straight Av should have been enough to run 8-9 but im hitting det everytime a load it real good! Does this seem normal????

I have hit the octane light quite a few times now! I even put in 2 gals of 110 rg in today with the rest av thinking that would take care of it but i still managed to hit the sensor a couple times before I had to back the boost down! How bad is this for motor each time it happens???? Going to run Straight Sunco 112 in it next time out see if thats enough!

Any chance i could have bad DET semsor??? It doesnt seem like I should need this kind of octane to max out a pump gas kit!

btw this is all been riding in deep snow climbing hills using Wide open alot! Charge temps have been right around 170 to 200!

 

[RACINSTATION]

You could have a bad sensor, but I would pull the power valves and look at the leading edges of the pistons if it were mine. I have seen them cause damage from hitting it one time and I have seen guys hit it all the time with no damage.

 

[backcountryislife]

Unless you've got the extra injectors... 9.5 is going to hit det for you, because you don't have the quantity of fuel to go that high.

You should be pretty solid at 8.5 though I'd think... and shouldn't need 100 at that level. If you're really hitting det there, I'd think there's something else going on.


Don't waste the money on more octane... that won't fix the problem if you're hitting det. What EGT or A/F are you seeing when you're hitting?

 

[WyoBoy1000]

usually its not a huge deal on a rg turbo but on a bd turbo if your over 99% duty cycle, its bad. Check pistons

 

[M1000Mod162]

Unless you've got the extra injectors... 9.5 is going to hit det for you, because you don't have the quantity of fuel to go that high.

You should be pretty solid at 8.5 though I'd think... and shouldn't need 100 at that level. If you're really hitting det there, I'd think there's something else going on.


Don't waste the money on more octane... that won't fix the problem if you're hitting det. What EGT or A/F are you seeing when you're hitting?

Running Egts and she hasnt climbed over 1150 yet I have been watching it pretty hard! I dont see how im running out of fuel when im in the mid 80s on my duty cycle at 8.5 to 9 lbs I think it would run 10.5 before I would max it out on fuel maybe more! Ive seen as much as 10.5 earlier in the season when there wasnt much snow and I was just racing on lake and only got to 93 out!

First ride out with it I tried running 80 percent 91 and 2 gals of rg and hit det the whole day at 6.5! I have been running straight av since then and got up to 9.5 ish before I started hitting it! But now that we have got all this snow and Ive been pushing it harder Ive been seeing det at about 8.5 with straight av!


Does your 11 have a completly stock motor backcounrty? What are your octane/boost limits?

 

[WyoBoy1000]

What elevation
does it have stock head
you should be able to run 6 on pg no problem

Make sure det sensor is torqued right, that is critical

 

[M1000Mod162]

What elevation
does it have stock head
you should be able to run 6 on pg no problem

Make sure det sensor is torqued right, that is critical

Do you know what the det sensor torque specs are Wyo?

Yes stock head! Im at 10,000ft! Ive notciced that on bd web site it says that the ho motor needs a head mod to run Pg!

I know it runs alot stronger then the 09 bd turbo my dad rides pound for pound on boost! So it makes since to me why it would need more octane!

Im just kinda torn I dont really want to run Rg Straight av expensive already im not into the timing key and It feels to slow at anything below 8lbs boost to turn boost down ! So I guess maybe 09 head/interheater/ cold air intake might all be good options at this point!

 

[adam8781]

go over the sled, a loose rattling piece of metal or something sloppy in the engine bay can set off the det as well.

DO you have a proper cold air intake? those intake temps are pretty high. On long wide open pulls charge temps jump. making det easier.

Cold air, add a intercooler, check out www.frozenboost.com or www.siliconeintakes.com They make it pretty easy to add a closed loop water to air to anything!

 

[backcountryislife]

You shouldn't be hitting det at those levels... something is wrong.

Without IC I can run 12.5 psi on 2 gal of race... you've got an issue you need to ferret out.

Don't add an inner heater .... find the problem.

Check arcticchat for the torque spec, it was talked about over there a bunch.

Sent from my A200 using Tapatalk 2

 

[colorado logger]

Thought I would let you know. I'm running an 09, pump gas, timing module, 8 pounds of boost , about 85 DC out. Cold air intake, 91 pump gas no ethanol, with 1 gallon of race per tank. the elevation is probably 11 to 12.

I hit the debt a couple of times yesterday on long hard pulls trying to get upon the divide. Next time out I'm going to try 2 gallons of race and carry an extra 1 to add if necessary.

I've been trying to get away from buying race. Damn stuff is expensive.

 

[WyoBoy1000]

17lbs is torque spec

also meaning the threads are good and clean and on install.

 

[w2bridin]

I bet your knock sensor is not torqued correctly or you have bad sensor. I was hitting knock sensor alot before i put turbo on. Found a loose sensor retourqed it now with turbo only time i hit it when loose traction from a bump or something then it hits the rev limiter.

 

[specialk6r]

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usually its not a huge deal on a rg turbo but on a bd turbo if your over 99% duty cycle, its bad. Check pistons

I just want to quickly amend Wyoboys comment on duty cycle for future readers: 99% duty cycle can mean either you have just enough fuel OR you've ran out of fuel. That statistic on the box only has space for 2 numbers, so 99% DC is as high as it reads, meaning if you see this number assume you've run out of fuel and twist knobs accordingly.

 

[wasatchcomm]

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I just want to quickly amend Wyoboys comment on duty cycle for future readers: 99% duty cycle can mean either you have just enough fuel OR you've ran out of fuel. That statistic on the box only has space for 2 numbers, so 99% DC is as high as it reads, meaning if you see this number assume you've run out of fuel and twist knobs accordingly.

absolutely correct....

if you have the '10 head on and no secondary injectors, not to mention no intercooler, you need to run avgas and you wont be able to run over 8lbs at 10k no way

i had same set up with intercooler and extra injectors running straight avgas and at 7k would gett octane light at 10lbs....added cold air intake and could do the 10lbs all day...
you are trying to run to much boost for the amount of fuel you are supplying motor, get secondary injectors and straight avgas and cold air intake... and you should be able to run up to 12-14lbs
imo....

 

[Uncle Bob]

correct me if i'm wrong but i was taught to consider 80% duty cycle as if it were 100% because the efficiency of the injector goes to hell after that. this was a major problem in the begining of the turbo 1000 development. hence two injectors at 50% is way better then 1 injector at 100% .

 

[specialk6r]

correct me if i'm wrong but i was taught to consider 80% duty cycle as if it were 100% because the efficiency of the injector goes to hell after that. this was a major problem in the begining of the turbo 1000 development. hence two injectors at 50% is way better then 1 injector at 100% .

I believe that's incorrect. MMsports tells me that those in the know believe the stock injectors are capable of pushing even more fuel than what we call 100% duty cycle, but parameters within the ECU tell them what their maximum should be. Myself and many others are running well into the 90's with good results.

 

[wasatchcomm]

I believe that's incorrect. MMsports tells me that those in the know believe the stock injectors are capable of pushing even more fuel than what we call 100% duty cycle, but parameters within the ECU tell them what their maximum should be. Myself and many others are running well into the 90's with good results.

you are correct special, i would set your cr # high enough that your secondarys are not coming on till you are in mid 90's with your stock duty cycle...

oh wait you dont have secondarys, correct?

i still think you are trying to run to much boost for the amount of fuel the stock injectors are pushing....

basically you are running a pump gas kit that is good to 8lbs in ideal conditions..
with the HO motor and stock head that boost number stays lower as well....
you need secondary injectors or put a 09 head on or maybe even the timing module... to run that much boost...

 

[summithd]

Agreed...

you are correct special, i would set your cr # high enough that your secondarys are not coming on till you are in mid 90's with your stock duty cycle...

oh wait you dont have secondarys, correct?

i still think you are trying to run to much boost for the amount of fuel the stock injectors are pushing....

basically you are running a pump gas kit that is good to 8lbs in ideal conditions..
with the HO motor and stock head that boost number stays lower as well....
you need secondary injectors or put a 09 head on or maybe even the timing module... to run that much boost...

 

[M1000Mod162]

you are correct special, i would set your cr # high enough that your secondarys are not coming on till you are in mid 90's with your stock duty cycle...

oh wait you dont have secondarys, correct?

i still think you are trying to run to much boost for the amount of fuel the stock injectors are pushing....

basically you are running a pump gas kit that is good to 8lbs in ideal conditions..
with the HO motor and stock head that boost number stays lower as well....
you need secondary injectors or put a 09 head on or maybe even the timing module... to run that much boost...

Im only running 89 out on my dc out at 9 lbs up here in this thin air at 10,500 Im not trying to push much more then that till I get the secondarys but I dont think Im going to rush getting them since I cant even max out the pg kit without hitting det on straight av! I have no interest in running straight rg. 100$ a ride is to much money for me! Ive backed the boost down to 8-8.5 and I still tap det when It gets hot but as long as she is cool it rips! Talked to Jarred S from bd and he said it was completly normal! So Might try a 09 head or timing module in future as well!

 

[summithd]

Ive backed the boost down to 8-8.5 and I still tap det when It gets hot but as long as she is cool it rips! Talked to Jarred S from bd and he said it was completly normal! So Might try a 09 head or timing module in future as well!

...was also what I experienced with the HO head at 9000-10,500' on both 09 and 10 sleds without the timing module.

Do yourself a HUGE favor and add a cold air intake!!!