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#131664 - 08/16/07 10:32 PM PCM vs JET'S HAPPY KNOB
Tyrehan Offline
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Registered: 11/27/04
Posts: 80
Loc: Gastonia, NC
What exactly dose the knob do?

Can you use it with an aftermarket pcm?

Is it better than a PCM?
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#131665 - 08/16/07 11:11 PM Re: PCM vs JET'S HAPPY KNOB
drummerboy1307 Offline
Member
Registered: 04/30/06
Posts: 3201
Loc: Groton, CT
Get a PCM... the happy knob isn't even worth your time
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#131666 - 08/16/07 11:30 PM Re: PCM vs JET'S HAPPY KNOB
crimpton Offline
Member
Registered: 05/01/02
Posts: 2126
Loc: Portland Or.
Please post a link to the product you are asking about.
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Clint Anderson
'00 Black GTP Sedan

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#131667 - 08/16/07 11:57 PM Re: PCM vs JET'S HAPPY KNOB
Blackarrow98GP Offline
Member
Registered: 06/29/06
Posts: 3618
Loc: CT, U.S.A
A quick search turned up this: JET Power Control Unit
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#131668 - 08/17/07 12:02 AM Re: PCM vs JET'S HAPPY KNOB
Digitallyphoenix Offline
Member
Registered: 05/11/07
Posts: 271
Loc: Daytona beach, Fl
pcm all the way. the jet knob wont do anything for shifts and speed govs and the most important thing... they dont have experience tuning these cars. dhp/zzp/wbs/intense all have plenty of experience from trial and error for what works and what doesnt.
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#131669 - 08/17/07 12:14 AM Re: PCM vs JET'S HAPPY KNOB
crimpton Offline
Member
Registered: 05/01/02
Posts: 2126
Loc: Portland Or.
PCM first..... Go with the "happy knob" to adjust for weather and elevation..... Good for a few HP at best.... Not ideal for the Daily Driver.
_________________________
Clint Anderson
'00 Black GTP Sedan

http://pdxcgp.com
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#131670 - 08/17/07 10:10 AM Re: PCM vs JET'S HAPPY KNOB
SlickGTP Offline
Member
Registered: 03/26/07
Posts: 1399
Loc: Houston, TX
Damn... That's a lot of money for something that probably equates to a variable resistor. Unless they jack into the wiring harness, which for me is a big no-no.

I'd vote for the PCM. It's the correct way to tune.

A true happy knob goes along with a special pcm tune that will take advantage of specific resistor values for advancing the timing. Really, it's only beneficial for the track in my opinion.
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Kinda sorta, yeah, no?

'02 Black GTP - RIP 03/03/08 ||| '06 Black G35 MT6 - Stock ||| '73 Chevy half ton(resurrected)
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#131671 - 08/17/07 11:08 AM Re: PCM vs JET'S HAPPY KNOB
framos242 Offline
Member
Registered: 07/15/04
Posts: 3141
Loc: Chicago, IL
PCM.
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#131672 - 08/17/07 11:24 AM Re: PCM vs JET'S HAPPY KNOB
zuulmusic Offline
Member
Registered: 04/22/05
Posts: 3075
Loc: Cleveland, OH
Quote:
Originally posted by SlickGTP:
Damn... That's a lot of money for something that probably equates to a variable resistor. Unless they jack into the wiring harness, which for me is a big no-no.

I'd vote for the PCM. It's the correct way to tune.

A true happy knob goes along with a special pcm tune that will take advantage of specific resistor values for advancing the timing. Really, it's only beneficial for the track in my opinion.
Agree, but the happy knob is good for more than just the track.

I'm making my own right now. It is, just as you mentioned, just a variable resistance. It uses your intake air temp sensor connector. Normally the sensor's resistance changes with temperature, and your PCM will give you more timing when IAT's are colder, or less timing when IAT's are hotter. Somebody with a tuner can go into these control tables and put in whatever they want for certain temperatures. So if you put a certain resistance across the IAT sensor connector, it will adjust timing by a given value. I think there are about 12 different steps of adjustment.

I'm just using a three way switch for -2, 0, or +2 degrees timing. This will be useful for hot days, cold days, and different octane fuels. I can keep an eye on the KR via the aeroforce scangauge, and adjust global timing on the fly.
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