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Old 05-23-2013, 02:28 PM   #1
sixthvw
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Who has switched tunes between APR and Unitronic - and why?

Curious if people have switched from one to the other and what their reasons might be - and after the switch, what was observed. It seems that there is a philosophical difference (timing advance vs boost) and I wonder which Stage 2 feels most linear.
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Old 05-23-2013, 02:31 PM   #2
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Well, Bowers did... but.... no one can talk about it, even though he could talk about it in the missive he sent to a mod to post here who eventually closed the thread he created because people were talking about the content he originally posted.

Confused? You should be. *tinfoil hat*

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Old 05-23-2013, 02:33 PM   #3
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Old 05-23-2013, 02:36 PM   #4
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Oh shit, he's goin' 3D!
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Old 05-23-2013, 02:37 PM   #5
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Just a few off the top of my head that have switched:

mdhollis
HYDE
allset
A_Bowers
NS01

From what I've seen, yes, there is a methodology difference between the tunes in how they make power. As for linear throttle, APR uses OEM Control strategies to dampen the overshoot while, I BELIEVE, Unitronic modifies the throttle for a more linear approach.
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Old 05-23-2013, 02:37 PM   #6
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Quote:
Originally Posted by GunKata View Post
Almost said something about this in OT haha.

OP do you have APR currently??
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Old 05-23-2013, 02:39 PM   #7
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Quote:
Originally Posted by grambles423 View Post
From what I've seen, yes, there is a methodology difference between the tunes in how they make power. As for linear throttle, APR uses OEM Control strategies to dampen the overshoot while, I BELIEVE, Unitronic modifies the throttle for a more linear approach.
Using different approaches, yes? one is timing and one is what? and if the differences can be explained, is one going to be technically more or less reliable than the other under heavy load/throttle and usage?
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Old 05-23-2013, 02:41 PM   #8
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Quote:
Originally Posted by GunKata View Post
Using different approaches, yes? one is timing and one is what? and if the differences can be explained, is one going to be technically more or less reliable than the other under heavy load/throttle and usage?
From what I gather... APR = higher boost which can possibly lead to drivability issues concerning spikes in boost

Uni = more/advanced timing and slightly lower boost to get similar numbers, potential for heat issues if not applied properly during combustion cycle.
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Old 05-23-2013, 02:41 PM   #9
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Quote:
Originally Posted by grambles423 View Post
Just a few off the top of my head that have switched:

mdhollis
HYDE
allset
A_Bowers
NS01

From what I've seen, yes, there is a methodology difference between the tunes in how they make power. As for linear throttle, APR uses OEM Control strategies to dampen the overshoot while, I BELIEVE, Unitronic modifies the throttle for a more linear approach.
Very useful information. This seems to go in line with the idea that Uni is in fact a more aggressive tune in comparison to APR correct
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Old 05-23-2013, 02:42 PM   #10
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Quote:
Originally Posted by FlyByGti View Post
Very useful information. This seems to go in line with the idea that Uni is in fact a more aggressive tune in comparison to APR correct
Define 'aggressive'. That word can lead people to think there are longevity/reliability sacrifices where there may not be.

Besides, is lower boost more aggressive?
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Old 05-23-2013, 02:42 PM   #11
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Quote:
Originally Posted by PatrickGTIVI View Post
From what I gather... APR = higher boost which can possibly lead to drivability issues concerning spikes in boost

Uni = more/advanced timing and slightly lower boost to get similar numbers, potential for heat issues if not applied properly during combustion cycle.
What do you mean by drivability issues
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Old 05-23-2013, 02:42 PM   #12
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I currently have APR with their intake, IC, and DP. Been very good for me BUT I would love a bit more linear response. It might not be as fast, but linear response to throttle and power is easier for me to drive quickly
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Old 05-23-2013, 02:44 PM   #13
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Quote:
Originally Posted by FlyByGti View Post
What do you mean by drivability issues
If you are experiencing spikes in boost during the midrange, this can make for difficulties driving around town and getting more than you were expecting. It also makes for very poor throttle response.
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Old 05-23-2013, 02:44 PM   #14
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I made the switch last week to Unitronic. This was due to a number of issues I had with my APR stage 2.

Pulling up at an intersection and the idle would dip only slightly and almost sound like it was going to stall. Boost seemed very choppy and not smooth. Also the tune would become weaker/ not pull as strong over 200 miles approx. Also car smelt really rich.

After the change all the above said issues have gone. No more stutter at intersections. Boost is smooth and so far tune is still pulling strong. Plus the car does not fume the crap outta you when you have the windows down at a light.

Still earlier days as only made the switch 6 days ago.
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