Superado

iTrader: (37)

Is this needed...will it assist in tuning w/ HPT...especially with the KR issues we have been experiencing...what are the drawbacks of NOT having one?

Is the correct part # 12580698 for my application...is it a direct replacement...no pigtail needed?

I did search this before asking...just unsure of it's benefits in my application...

Thanks...

trever1t

iTrader: (14)

I understand it like this....
2 bar will not affect WOT tune but will allow more precise tuning of area between 0 vacuum and WOT for better response and mid power.

I'm learning on the go!

BlownChevy

iTrader: (20)

$88.46 plus 5.00 shipping, and I can have one in a day. Let me know.

cablebandit

iTrader: (37)

Al...you deleted the pcv so once the oil is cleaned out of the intake tract, we will try some race gas...then we will know if its false or not. False knock is very common for your year pcm...we can tune it out but I want to make sure its false first!!

Bowtie70SS

iTrader: (10)

Do a search...the purpose of the 2 bar is so the PCM can read above 105Kpa. With a 2 bar you can do a speed density tune and eliminate the MAF. This would also come into play if you maxed out the MAF. With the 2 bar once you go into boost the pcm can tell how much and match it with the appropriate fuel mixture.

I am considering going 2 bar on my truck, I have been told you can get more power and more accurate fueling. If you are trying to pin down KR a wide band is a wiser investment.

Dave

2004SSS

iTrader: (25)

yeah, i agree with above. i plan on tuning for mine when i use the 60 lb injectors and 12+ psi. so i dont run pig rich when not in boost. also wil give you better mpg.

TurboBerserker

iTrader: (1)

Not at all true. A 2 bar tune DEFINITELY sees 100% benefit at WOT.

Here's the explanation. Normal driving, you will see some where from 40kpa-ish to 75-80kpa (105kpa = WOT in an NA truck). Now, take your 1 bar FI truck to WOT, you're pegged at 105kpa no matter what boost psi you are running.

If you are still running a MAF tune, in effect you are putting 100% faith in your MAF reading, which is generally okay until you are flowing more air than the MAF can read (i.e. maxing the MAF). Now, your MAF is no longer giving you valid readings, and will signal the PCM that it's maxed, so the PCM tries to guess about airflow by interpolating different values, one of which is your MAP based VE table, which is maxed at 105kpa...

If you are running an speed density tune, you have to make the 105kpa line in the VE table rich enough to cover you at full boost, which means you are losing power "under the curve" because of all the extra fuel.

1 bar MAPs read from 5.0kpa to 105.0kpa (which is 1 bar), and covers all the ambient pressures necessary (+46ft of altitude is ~101.9kpa) which means that you read almost no boost (the amount of pressure you run OVER ambient). Having a 2 bar MAP lets you read from 5.0kpa to 210kpa, or 1 bar in excess of ambient atmospheric pressure, meaning you can 14.7psi of boost, and tune for it in your VE tables. Plus, in a MAF based car, the PCM is better prepared for when you are maxing the MAF.

Bowtie70SS

iTrader: (10)

Well said turboberserker...I am still learning a lot about all of this and how to tune. When I get the time (spring I hope) I plan on going 2 bar to reap the benefits you mentioned above

Dave

Superado

iTrader: (37)

Is this in reference to the 2 bar MAP? I thought GMpartsdirect had them for like $41...
just asking...
also...is there a Borg-Warner equivalant?

Superado

iTrader: (37)

So...in a non-maxed MAF application...there is no benefit to the 2bar MAP?...or am I confused?