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Old 02-20-2004, 07:40 PM   #1
The Modaholic
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Member#: 35632
Join Date: Apr 2003
Chapter/Region: NESIC
Location: Natick, Massachusetts
Vehicle:
2004 WRX sedan
Red/ECUTek Stage IV

Default Poor communication from COBB...(misadvised)

I am not very happy with COBB folks right now. I am not knocking them, and I am sure they know what they are doing, but they failed to explain to me that I might "damage my engine" from running an off-the-shelf map reflash with a top mounted intercooler. After I got the Stage II reflash for my 04WRX with TXS turbo-back exhaust, I called them up and asked them if I needed a reflash to add a TXS uppipe and top mounted intercooler (V2). They said no, that the AccessECU would readjust. They failed to explain to me that this might lead to my car running lean (enough to lead to engine damage, as I was told over the phone by Noah). Since I just recieved a VF34 package, I asked them to send me the AccessPort with a VF34 map. When I told them I had the TXS TMI, Noah said that they didn't recommend that set up.

Not only do I have to wait two months for an AccessPort to put my VF34 in but now they have advised me to take my TMI off. And get this, it is going to cost another $500 to get the software to tune the car to run with the TMI, unless I drive to UTAH to dynotune. Boston to UTAH and back is 7 days of driving. Not to pay $217 an hour to dynotuning. No way.
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Last edited by The Modaholic; 02-20-2004 at 08:06 PM.
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Old 02-20-2004, 08:19 PM   #2
mexicanpizza
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Member#: 16779
Join Date: Mar 2002
Chapter/Region: SCIC
Location: Oceanside, CA
Vehicle:
2008 God's Gift to
Turbo Wagons (MS3)

Default

Since this was just a rant without any questions, etc...I'll just respond.

The recommended mods for their maps are listed plain as day on their site. There is even a section in the faq that talks about which "extra" mods are acceptable, and none of them are "intercooler".

I would've been extra careful about adding any non-standard mods to an off-the-shelf map, especially one that can effect boost so much.

Is your car actually damaged? I'm having a little trouble understanding why you're so pissed about the lack of a TMIC map. Last I heard, the full stage 3 will have a TMIC, in a couple months. Take the thing off and stick to their mod schedule, go to another tuner for ECUTek, or get yourself a UTEC or other standalone and tune it yourself. It's called an off-the-shelf map for a reason.
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Old 02-20-2004, 08:51 PM   #3
The Modaholic
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Member#: 35632
Join Date: Apr 2003
Chapter/Region: NESIC
Location: Natick, Massachusetts
Vehicle:
2004 WRX sedan
Red/ECUTek Stage IV

Default

no...not damaged, in fact I thought it was running fine. I was just surprised...that's all...to be completely honest, I didn't even see oanything on their website about it three months ago. After talking with someone on the phone who said that the ECU would adapt, I just accepted that info. at face value.

Yes, they are developing a map for a TMI of their own. I guess larger intercoolers really require dynotuning.
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Old 02-21-2004, 02:22 PM   #4
fogdor
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Member#: 45726
Join Date: Oct 2003
Vehicle:
2007 Mazdaspeed3
Cosmic Blue

Default

Can one our local tuning guru's please explain how a bigger intercooler can lead to a leaner air to fuel ratio?

I'm guessing that the larger intercooler causes cooler, denser air (more O2) to enter the combustion chamber. But doesn't this air get measured on its way -IN- (say, at the MAF) so that the engine management can add the appropriate amount of fuel?

I'm a n00b and I must be edumacated!
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Old 02-21-2004, 07:16 PM   #5
clamdip
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Join Date: May 2002
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the stage 2 is really an aggressive map in terms of timing and a/f ratios, which is why they require a turboback exhaust system to free up the combustion chamber as much as possible in order to have more efficient power. a bigger intercooler is only as efficient as the turbo. hence, bigger turbo, bigger intercooler, more boost, more power. however, you'll need to have it tuned to your set-up in order to get the proper a/f ratios. the cobb stage 2 is still running close to stock boost, therefore a bigger intercooler isn't really necessary nor will it damage the car. the ECU will adjust to it, however it won't make a difference. also, the stage 2 is already tuned to the stock intercooler, so there you go. if you get a smaller intercooler, then we might have a problem. the VF30/34 map is a bit on the conservative side in the sense that the a/f ratios and timing aren't very aggressive and target boost levels are about 17psi or so (somebody can confirm this) which is probably the stock intercoolers limit of cooling efficiency. if you install a bigger intercooler, you'll need to have it tuned to run a more aggressive map as well as a higher boost profile in order for it to be efficient.
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