Dyno tune or Handheld tune? - Ford Mustang Forum
 
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post #1 of 5 (permalink) Old 09-16-2016 Thread Starter
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Dyno tune or Handheld tune?

I have a 2002 mustang gt with a p1sc procharger. I recently got a new engine, just a regular 4.6 like the stock one except with a lot lower miles. The tune that was on it was a dyno tune. I called my local speed shop and asked about a tune. They said i dont need one and that if i did want one i would need a handheld tuner first. This doesnt sound right. Aren't those tunes two entirely different things?

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post #2 of 5 (permalink) Old 09-17-2016
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So the old motor was dyno tuned with the ps1 and now the new motor has is using the old tune? Are you using the same maf and injectors as you did on the old motor? How is it running? Like the old one only "better?" If so you're probably ok.
Is the place you called the place that tuned it the first time? I'm guessing no? It seems like if they tuned it before then they would have the software to tune it again. Was it tuned on the dyno and they burned a chip? If so do you still have the chip in? Or was the tuned via the obd2 port? If it's a chip find out what brand and find a dyno guy that uses that brand.
Did you have the original tune done? What'd you do the first time? Or did it you buy it with the tune already? If so maybe the po tuned it with a handled, had it "checked" on the dyno, and they didn't include the hand held tuner when they sold it?
But yeah either way I don't see why a dyno tuner would tell you to buy a handheld before they can tune it, I thought that's what they were for.
All that being said since you have a blower I'd at least find out what your air to fuel ratio is; whether that be by buying a wideband O2 sensor and a gauge or by having a few dyno pulls done just so they can see where you are. The first pull on the dyno after I installed my blower was 92 hp less than the final pull after the tuning was done because my initial a/f ratio was so bad.


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post #3 of 5 (permalink) Old 09-17-2016
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Dyno's usually use a handheld to upload their tune to the car, which is probably what the guy was trying to get at. Other than that 90lxwhite's post is pretty on point.


2001 GT Convertible
/1967 Coupe
All the usual bolt-on's /200 I6, C4

And a few Explorers too... 2008 4.0 XLT 4x2, 1996 XLT 5.0 4x2, 2003 Sport Trac XLT 4.0 4x4
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post #4 of 5 (permalink) Old 09-17-2016
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Quote:
Originally Posted by SoCal2V View Post
Dyno's usually use a handheld to upload their tune to the car, which is probably what the guy was trying to get at. Other than that 90lxwhite's post is pretty on point.


I thought they usually use a laptop.


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post #5 of 5 (permalink) Old 09-17-2016
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It may come down to preference of means and methods. I don't have a dyno tune (yet, but maybe soon) but I have heard from others more than once that the method I described in my post is usually how it goes. Personally I think that is a preferable way, as then YOU the owner of the car are in possession of your stock tune file and can also have other tunes written for whatever driving purposes (for varying levels of boost, changing out N2O jets, etc) and reflash the pcm as necessary.


2001 GT Convertible
/1967 Coupe
All the usual bolt-on's /200 I6, C4

And a few Explorers too... 2008 4.0 XLT 4x2, 1996 XLT 5.0 4x2, 2003 Sport Trac XLT 4.0 4x4
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