MY04 Liberty GT - FrankenStien - EOI welcome / FS

[Boostaddict]

I dun geddit???

Is it a good or bad code ?? If such an animal exists?

[dr20t]

Starting from scratch - but if we use airflow at known rpm and boost as a reference, we could probably calculate it and work back using trial and error on the dyno?

I'm going to do some logs tonight and tomorrow for wot stuff - try to scale the maf at lower boost pressures and see what happens

Should give us a good base to build from, you agree?

I reckon so, but perhaps you should ask NewbieGT?

Nah he'd be against it cos it ruins the originality of my 'rare and classy' 04 base model, auto GT in stock form....

[dr20t]

I dun geddit???

Is it a good or bad code ?? If such an animal exists?

Maxed out the maf - even though its a friggen massive 3.5" pipe - too much airflow. The voltage reading from the maf is based on programmed air flow. Once it hits 4.88v it starts maxing out. At 5v reading its maxed and will spit an error code.

This means the ecu cannot read the airflow going to the engine cos its flowing too much

The 3.5" pipe should be good for 320kw atw but its now maxed at out only 24psi once I fixed my fuel pump

Keep in mind I want to run 28-30psi of boost, leaner mixtures, and waaaay more timing.

So who knows what this combo will do

[KiDo_Tuning]

^^ This is where Speed Density tuning come in, we ignore the MAF sensor above 21psi boost and use the boost sensor to determine how much air is flowing through the engine based on volumetric efficiency(VE). Also lets us see where gains are being made since ideally we want around 250% VE on 27psi(90% at 0psi means multiplied by 2.8 to get around 250%) If VE starts failling away, then the cams are inefficient and we tweak either AVCS or ignition timing 2.5 degrees in either direction to see which direction the engine wants to flow etc.

[<GB>]

not too much avcs and its blowing out the exhaust ha ha !! my car is a fraction under the limit only just lol I thought you were going blended?

[jacks-GTB]

Yeh I was gonna say...I thought you were doing SD... Or has the SD tune not been applied yet

btw....I bet your excited for your final tune woot woot

[KiDo_Tuning]

Blended has not been activated yet, the fueling issues on dyno would of made it a waste of time!

[dr20t]

Avcs overlap has been all but eliminated

I'm talking 10 degrees intake advance and 10 degrees exhaust retard

It is an sd tune but not yet activated so running full maf tune at present

Mick

[Boostaddict]

I dun geddit???

Is it a good or bad code ?? If such an animal exists?

Maxed out the maf - even though its a friggen massive 3.5" pipe - too much airflow. The voltage reading from the maf is based on programmed air flow. Once it hits 4.88v it starts maxing out. At 5v reading its maxed and will spit an error code.

This means the ecu cannot read the airflow going to the engine cos its flowing too much

The 3.5" pipe should be good for 320kw atw but its now maxed at out only 24psi once I fixed my fuel pump

Keep in mind I want to run 28-30psi of boost, leaner mixtures, and waaaay more timing.

So who knows what this combo will do

Uuuuummm ...... Holy sheeeeett!

This thing must be an freckin animal.! I so need a passenger seat wot run!!!

Btw all this speed density stuff ...... Wooosh over the head!!

Obviously its for the big boys and not for the little boys just mucking around!! Hahahha

[kiahatsiu]

Watching with interest. I suspect I will be going down the same path shortly too. That said, i won't be turning my engine anywhere near as high as this one, 7000 max for the old 2.5. So I don't expect anywhere near the power of this contraption.

[KiDo_Tuning]

Uuuuummm ...... Holy sheeeeett!

This thing must be an freckin animal.! I so need a passenger seat wot run!!!

Btw all this speed density stuff ...... Wooosh over the head!!

Obviously its for the big boys and not for the little boys just mucking around!! Hahahha

Air flow meter near the air filter can only generate 5 volts maximum so instead of losing tuning resolution by going to a 4" housing, we ignore the airflow meter and use how much boost pressure is in the inlet manifold to work out how much air the engine is consuming per engine revolution.

[Boostaddict]

Uuuuummm ...... Holy sheeeeett!

This thing must be an freckin animal.! I so need a passenger seat wot run!!!

Btw all this speed density stuff ...... Wooosh over the head!!

Obviously its for the big boys and not for the little boys just mucking around!! Hahahha

Air flow meter near the air filter can only generate 5 volts maximum so instead of losing tuning resolution by going to a 4" housing, we ignore the airflow meter and use how much boost pressure is in the inlet manifold to work out how much air the engine is consuming per engine revolution.

You make that sound sooooo simple actually. I totally get it , but I'm guessing that its just not THAT simple.

Why not use this in factory spec??

[KiDo_Tuning]

Uuuuummm ...... Holy sheeeeett!

This thing must be an freckin animal.! I so need a passenger seat wot run!!!

Btw all this speed density stuff ...... Wooosh over the head!!

Obviously its for the big boys and not for the little boys just mucking around!! Hahahha

Air flow meter near the air filter can only generate 5 volts maximum so instead of losing tuning resolution by going to a 4" housing, we ignore the airflow meter and use how much boost pressure is in the inlet manifold to work out how much air the engine is consuming per engine revolution.

You make that sound sooooo simple actually. I totally get it , but I'm guessing that its just not THAT simple.

Why not use this in factory spec??

It is that simple because lots of cars use that method of tuning... heard of a Maf-less tuned Commodore V8, same concept! )
Subaru STi Spec Cs use Speed Density tuning as well and is why so many tuners fit Microtech's etc to cars.

MAF sensor is more accurate for cruise fuel economy and emissions, only reason it is used

[dr20t]

Watching with interest. I suspect I will be going down the same path shortly too. That said, i won't be turning my engine anywhere near as high as this one, 7000 max for the old 2.5. So I don't expect anywhere near the power of this contraption.

Mate yours and j's setups should swallow my tiny 2.0 litre up once you guys are properly setup and tuned. GB's setup is another one that will shit on mine once proper turbo and intercooler setup and decent tune is done. Remember mine is pretty much stock except for head studs and turbo.

You guys all may not rev to the moon due to longer stroke and engine config but you won't need to with the meatier area under the curve !

I'm just hoping that once we fix this exhaust leak, bump up the timing and optimise can timing that it hits 20psi by 3500rpm. That will give me 5000rpm of a solid power band to play with which should be fun

If not then ill be throwing in some 272 degree cams and make sure of it

Mick

[jslayz]

MMMMmmm 272's.

Keeping a close eye on this thread, exciting stuff!!

J