04-05 Bonneville GXP Tuning - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Bonneville GXP/ Northstar Powered Cars Discuss your Bonneville GXP and/or any other Northstar powered Olds or Cadillac... Including the 3.5L Twin Cam V6 (Short Star ) 4.0L and 4.6L Northstar V8's. Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 03-31-2012, 10:27 PM   #11
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Hey Mike, thanks for the concern but I always have a back-up plan. I always keep an exrta stock pcm for my cars just in case something like that happens. But it seems that he has been doing this for a while for a lot of the GM cars. Ion has answered or have returned my phone call or e-mail asap every time, wich is very good customer service if you ask me.

I know that he is looking for a local car to program on the dyno, he is out of Elgin, IL 60123.
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Old 03-31-2012, 10:32 PM   #12
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madtuner is good guy, he and i have done a considerable amount of work getting the 93-95 3100 and 3.4RWD cars tunable(flash PCMs, basically a 94-95 LT1 unit with less PROM space).

not surprising that he got to the "oddball" northstar stuff, he seems to be doing a lot of work lately with the less supported applications.

he also doesn't necessarily use commercial programs for a lot of things either, just to let you know.
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Old 03-31-2012, 10:34 PM   #13
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Quote:
Originally Posted by paulyGXP View Post
Any idea of what the tune consisted of? What did they change?
He can adjust: transmission, thermostat, injectors, throttle body, torque coverter, mass airflow sensor, maf, catalytic converter, nitrous, rev limiter, shift points, touque management and idle.

Options: powertune, disable speed limiter and increase shift firmness. This is what he started with on mine but he'* looking to be able to max tune in the next few months or so. I got the first one out, lets call it stage 1 I love it so far and can't wait to upgraded it when he'* ready.
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Old 03-31-2012, 10:40 PM   #14
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My concern with tuning is, if any changes are made, how can one be sure the changes are not having a bad effect with the engine unless scanning is being done? I have always been weary of mail order PCM programming. Even if they had an EXACT duplicate car of yours onsite to test, your car will still run differently.
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Old 04-01-2012, 01:20 AM   #15
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Any idea of what the tune consisted of? What did they change?
Mike,
I understand what your saying but I sent him a data file with all my car'* information. It had all my trims on it at wot and just regular driving around town so he didn't do my tuning blindly, he had a starting point.
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Old 04-01-2012, 01:47 AM   #16
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What did you scan with?
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Old 04-01-2012, 03:58 AM   #17
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We used UV Scan. It can be found at the Club GP Forum, the program is a spin off of the DHP "Power Tuners Software" or Digital Horespower Inc. Tuning Platform.
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Old 04-02-2012, 12:24 PM   #18
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Well, I guess we will see how it holds up. Glad someone is atleast making an effort to crack the PCM! Keep us updated as you put miles on!
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Old 04-07-2012, 12:12 AM   #19
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Quote:
Originally Posted by Black Juan View Post
the mild tune that he did for me made my car come alive in the thin air. I'm heading to the track tomorrow to make a few runs to see what I put down
hey juan, can you be more specific on the difference the tune has made in your performance and have you noticed any difference in MPG? have you had a chance to get to the track yet. I live about 20 miles from the Dyno shop he uses for tuning. I spoke with him this evening and could consider the tune but I was looking for an increase in MPG since I drive the GXP 120 miles a day. But then a few extra HP'* under the hood wouldn't hurt either
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Old 04-07-2012, 06:14 AM   #20
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It is a lot more responsive, the shifts are shorter and tighter. The passing on the highway is a lot of fun because when it down shifts it doesn't wait around. I'm getting around 17.2 in the city but I have a real problem with my right foot and around 27.5 on the highway when on cruise control, so I'm happy with those numbers. I have to say that I also have a custom cold air intake and flow master 44 series mufflers, so my air flow is very good but I also live at over 5000ft in elevation. I'm looking to go down to sea level to run in Sacramento soon so that I can get a true number in the quarter mile.

I hope that you can work something out with Madtuner to work on your tune because I would like to be able to get a max tune soon. My tune was a starter point until he could get a local car on the dyno, you will be doing all of us Northstar guys a big favor if you let him work on it.

I hope that this will help you make up your mind. Thanks
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