Quote from: polskifacet on January 06, 2017, 10:27:21 AM
Today its a whopping 2f in Chicago. Did a couple wot pulls on the 87 tune (stock map on 3 bar) from LMS and its maxing out between 7 and 8 PSI, I normally see 10s.

Do you normally see 10s with the 87 tune? Or with the 91/93 tune?


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Quote from: StealBlueSho on January 06, 2017, 11:20:30 AM

Quote from: polskifacet on January 06, 2017, 10:27:21 AM
Today its a whopping 2f in Chicago. Did a couple wot pulls on the 87 tune (stock map on 3 bar) from LMS and its maxing out between 7 and 8 PSI, I normally see 10s.

Do you normally see 10s with the 87 tune? Or with the 91/93 tune?


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Seconded, lower octane tune will command less MAP pressure/tip pressure/torque so car will not be commanded for or need as high of boost.

Along with that, depending on conditions there is a chance that a torque modifier was in place as well. For instance, when logging recently, I had some slipping/spinning due to cold roads, etc. and saw a significant boost cut due to traction control enabling.

I personally avoid doing any wot-pulls under 10 deg weather.  Z

Quote from: ZSHO on January 06, 2017, 11:35:38 AM
I personally avoid doing any wot-pulls under 10 deg weather.  Z

That's a fair statement. Very hard to resist on a open highway though. Nothing is broken, higher octane tune shows higher boost. My exhaust has always howled part throttle.

Quote from: ZSHO on January 06, 2017, 11:35:38 AM
I personally avoid doing any wot-pulls under 10 deg weather.  Z

That is absurd...waste of a car

I really can not see LMS boost levels of 190 kpa being a problem for fuel pressure for regular E10 gas at ANY temp..i enjoy going wot on a turbo car when its cold..they love it

The 10 degree ambiant temp really doesnt matter...once warmed up to operating temp id say your iat2 is around 50+ anyway so thats what the engine is really seeing

seems to be 20 degrees over ambient so 5f IAT is 20 to 25 on iat2

Quote from: AJP turbo on January 06, 2017, 07:11:25 PM

That is absurd...waste of a car

I really can not see LMS boost levels of 190 kpa being a problem for fuel pressure for regular E10 gas at ANY temp..i enjoy going wot on a turbo car when its cold..they love it

The 10 degree ambiant temp really doesnt matter...once warmed up to operating temp id say your iat2 is around 50+ anyway so thats what the engine is really seeing

IIRC the 4+X tune on the 2010-2012 calls for 187kpa under WOT... and that's the most aggressive one... although timing is pretty up there around 23 degrees advanced....

In have run that one in under freezing temps without an issue... hammering on it.. no problems...

Quote from: polskifacet on January 06, 2017, 07:31:51 PM
seems to be 20 degrees over ambient so 5f IAT is 20 to 25 on iat2

Maybe before the car is heat soaked...if you are only getting 20-25 degree over amb then you have a good intercooler and dont suffer the problems everyone else does

Quote from: StealBlueSho on January 06, 2017, 07:42:05 PM

Quote from: AJP turbo on January 06, 2017, 07:11:25 PM

That is absurd...waste of a car

I really can not see LMS boost levels of 190 kpa being a problem for fuel pressure for regular E10 gas at ANY temp..i enjoy going wot on a turbo car when its cold..they love it

The 10 degree ambiant temp really doesnt matter...once warmed up to operating temp id say your iat2 is around 50+ anyway so thats what the engine is really seeing

IIRC the 4+X tune on the 2010-2012 calls for 187kpa under WOT... and that's the most aggressive one... although timing is pretty up there around 23 degrees advanced....

In have run that one in under freezing temps without an issue... hammering on it.. no problems...

Timing is pretty up there as you say because at 185 kpa load is lower and the spark tables follow load so lower load will yield more spark...and that spark was also your car and we know your car loved the spark

Take a look at an explorer sport under the same conditions and i bet you wont see 23 degrees....for some reason they dont tolerate the spark

Quote from: AJP turbo on January 06, 2017, 07:51:16 PM

Quote from: StealBlueSho on January 06, 2017, 07:42:05 PM

Quote from: AJP turbo on January 06, 2017, 07:11:25 PM

That is absurd...waste of a car

I really can not see LMS boost levels of 190 kpa being a problem for fuel pressure for regular E10 gas at ANY temp..i enjoy going wot on a turbo car when its cold..they love it

The 10 degree ambiant temp really doesnt matter...once warmed up to operating temp id say your iat2 is around 50+ anyway so thats what the engine is really seeing

IIRC the 4+X tune on the 2010-2012 calls for 187kpa under WOT... and that's the most aggressive one... although timing is pretty up there around 23 degrees advanced....

In have run that one in under freezing temps without an issue... hammering on it.. no problems...

Timing is pretty up there as you say because at 185 kpa load is lower and the spark tables follow load so lower load will yield more spark...and that spark was also your car and we know your car loved the spark

Take a look at an explorer sport under the same conditions and i bet you wont see 23 degrees....for some reason they dont tolerate the spark

Makes sense, when boost is lower the timing is higher in the logs I see... I just assumed that was traditional tuning boost vs spark... raise boost where you want it and slowly add timing into it until you start picking up knock then back it off a bit...and generally it's a give and take.. more boost or more spark... not cranking hard on both... at least as I understand it..

The only logs of guys running more than 21 degrees of spark without knock are mixing E at 20% or higher...

Although FoMoCo had some interesting logs running really high E mixes..

But I digress... the OP shouldn't be seeing hesitation issues unless something outside the range of normal is not correct.


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Quote from: AJP turbo on January 06, 2017, 07:11:25 PM

Quote from: ZSHO on January 06, 2017, 11:35:38 AM
I personally avoid doing any wot-pulls under 10 deg weather.  Z

That is absurd...waste of a car

I really can not see LMS boost levels of 190 kpa being a problem for fuel pressure for regular E10 gas at ANY temp..i enjoy going wot on a turbo car when its cold..they love it

The 10 degree ambiant temp really doesnt matter...once warmed up to operating temp id say your iat2 is around 50+ anyway so thats what the engine is really seeing

What's absurd about wanting to take care of your car in single digit temps??.(Each his own). Z

manifold charge temp 50f

Quote from: ZSHO on January 06, 2017, 08:19:39 PM

Quote from: AJP turbo on January 06, 2017, 07:11:25 PM

Quote from: ZSHO on January 06, 2017, 11:35:38 AM
I personally avoid doing any wot-pulls under 10 deg weather.  Z

That is absurd...waste of a car

I really can not see LMS boost levels of 190 kpa being a problem for fuel pressure for regular E10 gas at ANY temp..i enjoy going wot on a turbo car when its cold..they love it

The 10 degree ambiant temp really doesnt matter...once warmed up to operating temp id say your iat2 is around 50+ anyway so thats what the engine is really seeing

What's absurd about wanting to take care of your car in single digit temps??.Z

What makes you think you are taking care of it any better by not going wot when cold?....in fact it may be less stressful on the car going wot when colder.....its a machine not a man, it doesnt feel cold like you do

Thermal loads are much lower when cold..i see many more stress induced failures when hot not cold...your car loves the cold dont deprive it Z

Quote from: AJP turbo on January 06, 2017, 07:51:16 PM

Take a look at an explorer sport under the same conditions and i bet you wont see 23 degrees....for some reason they dont tolerate the spark

True story. Even at lower boost levels, I don't think I've seen anything much over 10 degrees advance or so at WOT.


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Quote from: AJP turbo on January 06, 2017, 07:11:25 PM

Quote from: ZSHO on January 06, 2017, 11:35:38 AM
I personally avoid doing any wot-pulls under 10 deg weather.  Z

That is absurd...waste of a car

I really can not see LMS boost levels of 190 kpa being a problem for fuel pressure for regular E10 gas at ANY temp..i enjoy going wot on a turbo car when its cold..they love it

The 10 degree ambiant temp really doesnt matter...once warmed up to operating temp id say your iat2 is around 50+ anyway so thats what the engine is really seeing

What would you say the cause is if it's not running out of fuel?