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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > v2 sputter



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      07-01-2008, 03:15 PM   #23
lawdude
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Yum, no. As in blutwurst.
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      07-01-2008, 03:15 PM   #24
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Originally Posted by LambOfGod View Post
I owned a B5 S4 Audi and sold it to buy the 335. I had an APR Chip in my Audi and the thing worked perfect. I had no idea that the Piggy would be so unstable and cause so much controversy. After buying V1 and having problems then getting duped into buy the V2 upgrade for $150 thinking it was going to solve the problems only to have more problems. I'm not getting duped into buying another freaking upgrade when V2 was suppose to be a flawless tune.
like the saying goes, third time is a charm. Unfortunately this was the case for the procede.
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      07-01-2008, 05:57 PM   #25
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like the saying goes, third time is a charm. Unfortunately this was the case for the procede.
You guys are killing me.
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      07-01-2008, 05:57 PM   #26
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Yum, no. As in blutwurst.
How did you get on food "One Liners" today?

Crazy!
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      07-01-2008, 05:59 PM   #27
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I have puke in my mouth.
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      07-01-2008, 07:49 PM   #28
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How did you get on food "One Liners" today?

Crazy!
I'm doing a "Motif Day". If it proves popular I might do one every six months or so. Notify the media.
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      07-01-2008, 08:05 PM   #29
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Originally Posted by scottp999 View Post
Yeah. Shiv's comments to me where that a mechanical gauge would be a better reading, but it still threw me for a loop. They were not spikes during shifts, the reading measured while staying in 2nd gear at WOT and then just letting off the to read the highest boost reading. I could see it climb right through 15, 16, 17, 18. If a mechanical gauge would have been better, then I have to question why V3 is so precise in boost targets on the digital gauge, meaning I think the digital gauge was accurate when I was testing V2.


I am extremely happy with the V3 upgrade and would recommend it to everyone. I am also glad that it came out in such short order (6 months after installing V2). V3 is quite the improvement.
In general, the most accurate boost gauges are the ones that are electronic/electrical, ie, they are attached to a calibrated MAP sensor. You tap the MAP sensor into the intake manifold through one of the many hoses attched to the manifold. The MAP sensor would read the pressure and then send a 0-5 volt signal to the gauge. The gauge will display this signal in psi. For example, here is the way my JDM EVO MAP sensor is calibrated.

PSI------Volt
-14.7----0
-8.9-----0.593
-4.4-----1.056
0--------1.508
20.1-----3.574
32.7-----4.870

MAP based gauges are the most accurate boost gauges. They run about $250and are well worth it.

If you have a MAP based gauge, then it is more accurate than a mechanical gauge. A Mechanical gauge does not use a MAP sensor to read boost. A boost reading on a mechanical gauge can be off by 1-2 psi. I had a Defi Mechnical gauge and when I tested it against my bench tested MAP sensor it was off by about 2 psi. I sold it and now I only log boost with MAP sensors on my car and on every car that I tune.

It is really irresponsible for any tuner to tune a car simply using a gauge, especially a mechanical one.

Last edited by nj1266; 07-01-2008 at 08:55 PM..
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      07-01-2008, 08:54 PM   #30
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Originally Posted by Sniz View Post
not something I would live with FYI.....If V3 is a much more stable product, I believe its worth the $375 or whatever it is for the upgrade.

And yes I agree it would have been nice if V1 was the final finished product, but.....
But can you trust that the V3 is stable. Given past history it might not be. So you get the V3, pay for the upgrade and then problems crop up, that can olny be solved with V4. But guess what, you will have to pay for V4. And the cycle repeats.
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      07-01-2008, 11:15 PM   #31
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But can you trust that the V3 is stable. Given past history it might not be. So you get the V3, pay for the upgrade and then problems crop up, that can olny be solved with V4. But guess what, you will have to pay for V4. And the cycle repeats.
Anyone guess ....but if it happens I'll have a field day with the subject. I hope it doesn't.
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      07-01-2008, 11:20 PM   #32
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I'm doing a "Motif Day". If it proves popular I might do one every six months or so. Notify the media.
Do Music from the "80's"....that would be freaking hilarious!
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