lost rpm

[KnappAttack]

Being in MN subject to same below zero this weekend, running with 3Tcats on Stage 3 and 1 Sidewinder Max17, all over-boosting to 20-22 lbs. No datalogging but all survived by seriously limiting time at WFO with boost too high. All running 93 octane non-oxy gas fortunately.
The 3 TCats are PEFI Stage 3. PEFI told them stock fuel pump and injectors are maxed out at -10F which is close to where temp was.
I agree with KA. ECU seems to not be able to control boost in super cold temps. Why?

Exactly why I was on 240 this weekend. And even there I was boosting more than the 270 would normally run. It's important to have the multi map just for these cold conditions. Even on 240 with the 3" muffler I was out of injectors running 12.2-12.3 AF ratio at 18.6-18.7 lbs. of boost. I was running 93 octane with booster so all good. If the intake temp was in the teens of above F or higher I could click it on 270. Forget about trying to run on 300. 300 tune I'd need more than 20F-30F intake temps.

The bottom line is no matter what the tune says, if its making XXX HP it needs so much fuel to make that power, and were all bolting on stuff to make more power so we bypass the tune limits.

Easy to detune it I suppose by going to a smaller muffler and back to the stock intake airbox, but no, we all want to beat our neighbor. It's all about the observed HP levels. Yes, the 240 tune will make 300 HP if done right. LOL!

 

[sideshowBob]

Northwestern Ontario has been as cold as -40F/C and no warmer then -25C/-15F for almost 2 weeks now.
I havent been doing much riding but when I do I have not even selected anything other then the 240SS PM flash.
I dont want to go looking for issues

 

[Crossfire12]

Guess the tunes are good just don’t use them when it’s cold out.

 

[max rolph]

my afr was at 12.01 at wot and the boost climbed to 25 soo i came off right away, i havethe ability to rich mine up which im gonna do now.

 

[sideshowBob]

In our area we are into abnormally cold temps but if the trend is going to continue I guess with all the upgrades I have done on my Winder I may look into larger injectors in the off season I already have upgraded the fuel pump and regulator.

 

[max rolph]

What tune ar


What tune are you running with the upgraded waistgate/4 port solenoid? If the 20lb tune and you have the boost increase “enabled” more boost will ramp in depending on how you have adjusted in the new flasher firmware.

well i have every tune that TD makes even up to 360hp closed loop, im only running Max 20, and he just made the tune for the 4 port upgraded waste gate.... it friggin spools instantly to high boost and climbs, i dont have boost timing or controll activarted, just the Closed loop... 14.1 cruis mode, 13.2 mid and 11.8 WOT.... waste gate was set at whatever they did tuesday but we ran out of time before i had to leave... after found a small leak in charge tube clamp... all fixed now and now im getting rpm.... albeit with a cat belt... gonna test right now with XS827 belt. ill have to watch RPM and Boost as to make sure im not getting RPM due to huge boost. i do have 97 octane in soo i should be safe just not for long periods thou.

 

[0degC]

well i have every tune that TD makes even up to 360hp closed loop, im only running Max 20, and he just made the tune for the 4 port upgraded waste gate.... it friggin spools instantly to high boost and climbs, i dont have boost timing or controll activarted, just the Closed loop... 14.1 cruis mode, 13.2 mid and 11.8 WOT.... waste gate was set at whatever they did tuesday but we ran out of time before i had to leave... after found a small leak in charge tube clamp... all fixed now and now im getting rpm.... albeit with a cat belt... gonna test right now with XS827 belt. ill have to watch RPM and Boost as to make sure im not getting RPM due to huge boost. i do have 97 octane in soo i should be safe just not for long periods thou.

They should have set waste gate to crack at 9psi, I am sure they did. I believe they have a 17, 20 and race gas tune for the new waste gate... maybe go down to the 17 tune until you figure out your boost? The 827 will bring down your rpm lots compared to OEM belt.

 

[1nc 2000]

Exactly why I was on 240 this weekend. And even there I was boosting more than the 270 would normally run. It's important to have the multi map just for these cold conditions. Even on 240 with the 3" muffler I was out of injectors running 12.2-12.3 AF ratio at 18.6-18.7 lbs. of boost. I was running 93 octane with booster so all good. If the intake temp was in the teens of above F or higher I could click it on 270. Forget about trying to run on 300. 300 tune I'd need more than 20F-30F intake temps.

The bottom line is no matter what the tune says, if its making XXX HP it needs so much fuel to make that power, and were all bolting on stuff to make more power so we bypass the tune limits.

Easy to detune it I suppose by going to a smaller muffler and back to the stock intake airbox, but no, we all want to beat our neighbor. It's all about the observed HP levels. Yes, the 240 tune will make 300 HP if done right. LOL!

Are you running a header Mike?

 

[STAIN]

I think different fuel is playing into this also. Had 1 sled that went into deto this Friday and one did not. It was just the opposite on Saturday with the other sled going into deto and the first one was fine. the sleds fueled at different locations Friday morning, same Friday afternoon, different again Saturday morning.
It is hard to pin down what is causing these trail muffler flashes to be so inconsistent. Like Knapp says, air temp seems to play a very large role in the performance of the tune.

 

[yamahahaapex]

-30c here and still struggling to get to 17lbs on 270. Up to 15.9. On 300 Im at 17.6 so the cold weather isnt fixing my problems either unfortunately. 8* colder than freezing temps on the intake guage. No boost leaks, sled stalls once exhaust is plugged. Seems like Ive got the same issue where it might come out at 8900rpm and then fall on its face at 8400 at 400' and wont climb any further.

 

[1nc 2000]

Exactly why I was on 240 this weekend. And even there I was boosting more than the 270 would normally run. It's important to have the multi map just for these cold conditions. Even on 240 with the 3" muffler I was out of injectors running 12.2-12.3 AF ratio at 18.6-18.7 lbs. of boost. I was running 93 octane with booster so all good. If the intake temp was in the teens of above F or higher I could click it on 270. Forget about trying to run on 300. 300 tune I'd need more than 20F-30F intake temps.

The bottom line is no matter what the tune says, if its making XXX HP it needs so much fuel to make that power, and were all bolting on stuff to make more power so we bypass the tune limits.

Easy to detune it I suppose by going to a smaller muffler and back to the stock intake airbox, but no, we all want to beat our neighbor. It's all about the observed HP levels. Yes, the 240 tune will make 300 HP if done right. LOL!

@HURRICANE is this a problem with his sled or your tunes?

 

[KnappAttack]

Are you running a header Mike?

No header on mine. Just performance muffler tunes.

As you can see, its not just one brand of tunes, they are all acting this way in the cold. PEFI, Hurricane or TD, doesn't matter.

Think about how different everyones setup is. This guy has a header, that guy a 3" muffler, that guy 2.5", another has a 3.5". He has a CAI, the next one does not. He has an adjustable fuel regulator, then Joe has an aftermarket intercooler. Big fuel pumps, stock fuel pumps, it goes on and on. We're all over the board for parameters on these machines and asking the tunes to keep up. It's pretty hard to pin down how a machine should react to the cold, but the extreme cold sure seems to override the boost level the tune is supposed to hold. Lots of people seeing 4 lbs or so more boost increase over what they would normally see.

What I'm saying is to watch the boost levels and A/F ratio closely so one doesn't get into trouble, as the ECU does not seem to be able to hold things where it was designed to operate at when operating in the extreme cold.

 

[1nc 2000]

No header on mine. Just performance muffler tunes.

As you can see, its not just one brand of tunes, they are all acting this way in the cold. PEFI, Hurricane or TD, doesn't matter.

Think about how different everyones setup is. This guy has a header, that guy a 3" muffler, that guy 2.5", another has a 3.5". He has a CAI, the next one does not. He has an adjustable fuel regulator, then Joe has an aftermarket intercooler. Big fuel pumps, stock fuel pumps, it goes on and on. We're all over the board for parameters on these machines and asking the tunes to keep up. It's pretty hard to pin down how a machine should react to the cold, but the extreme cold sure seems to override the boost level the tune is supposed to hold. Lots of people seeing 4 lbs or so more boost increase over what they would normally see.

What I'm saying is to watch the boost levels and A/F ratio closely so one doesn't get into trouble, as the ECU does not seem to be able to hold things where it was designed to operate at when operating in the extreme cold.

I am running mine as Dave at Hurricane said to run it and seeing no knock light in this cold weather on 300ss header performance muffler 02 module tune.
Is your knock light going off when you are running lean?

 

[KnappAttack]

I am running mine as Dave at Hurricane said to run it and seeing no knock light in this cold weather on 300ss header performance muffler 02 module tune.
Is your knock light going off when you are running lean?

Not on the 240 tune, but higher tunes than that yes. Thats how I noticed it was the 270 flashed at me. Other machines the same thing, 270 would flash the dash too.

 

[0degC]

-30c here and still struggling to get to 17lbs on 270. Up to 15.9. On 300 Im at 17.6 so the cold weather isnt fixing my problems either unfortunately. 8* colder than freezing temps on the intake guage. No boost leaks, sled stalls once exhaust is plugged. Seems like Ive got the same issue where it might come out at 8900rpm and then fall on its face at 8400 at 400' and wont climb any further.

Sure sounds liked you have checked over well. Odd. If have not checked already check lines in and out of waste gate solenoid for water or oil. Maybe replace waste gate solenoid. Check turbo intake wheel for damage maybe you sucked something in?