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Old 02-02-2006, 09:57 AM   #1
Biznessdude
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Member#: 88433
Join Date: Jun 2005
Default Accessport Tune Question

Hey guys,

I recently had a mechanic add the following "power mods" to my '04 WRX wagon: Helix TMIC, Perrin Fuel Rail, Sti 550cc Injectors, VF-34, Walbro Fuel Pump, Cusco turbo heat shield, Perrin Turbo Inlet Hose, Sti Hood Scoop & Splitter. I already had a catless UP, Helix hi-flow catted DP, Borla Hush exhaust, and K&N Drop In Air Filter. All of this is run on California's crappy 91 octane.

My tuner (who did not put these latest mods on) has converted my original tune from an Ecutek reflash to the Cobb Accessport. I asked him to put a custom tune (is that what they call the Protune or Streettune?) on there to really enhance the mods. He's been baffled by getting a "dip" in the power curve near the top of the arc (if you're looking at a printout of a Mustang Dyno run), instead of a broad, flat curve. Sorry, I don't have any pics of a run to show you. So, instead of getting what should be an expected 240-250 whp, I get more like 210-220 tops on the runs and a little over 220lb ft of torque.

He says everything looks good (AF ratio, etc.), but he can't figure out the cause of the dip after many, many runs and tweaking. He's examined the hoses to the turbo, and next will be checking out the stock TMIC,etc. to see if something might be wrong with the Helix TMIC. He says that I can safely take it to the track this Saturday, but that the dip will reveal itself as not as much "oomph" when I hit the gas pedal as I should be getting with a good, custom Accessport tune.
He's still working on the situation, and he has talked with a couple of other tuners to get some ideas. But, I was wondering if anyone here might have some ideas on what to look for, etc. that I could forward to him.
Thanks!
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Old 02-02-2006, 10:33 AM   #2
hondaeater69
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Location: a pillow.
Default

could just be the gas. I would try a run and have him tune a race gas map, see if he can then tune it out.

HOw big of a dip are we talking here? Small dips aren't that uncommon in these cars. .
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Old 02-02-2006, 01:59 PM   #3
23b_Rex
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02 gda
wrb

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what's the boost doing during this "dip"
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Old 02-03-2006, 10:13 AM   #4
Biznessdude
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Hey guys,

I'll get my car back today from the tuner. He seems to have eliminated the dip, so I'll have to check the #'s and get back with you.
Thanks for the advice!
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Old 02-03-2006, 10:15 AM   #5
CalcVictim
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Location: Brighton, MA
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2006 Miata
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Quote:
Originally Posted by Biznessdude
Hey guys,

I'll get my car back today from the tuner. He seems to have eliminated the dip, so I'll have to check the #'s and get back with you.
Thanks for the advice!
what was the problem?
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