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Old 05-06-2006, 02:53 PM   #1
accelguy
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Question Please help with the OL/CL delay problem

Regarding my last post, I am sorry for all the confusion and guessing for not letting you guys know where I am based (Hong Kong).

My 05 WRX is the European Version. The chassis No. of my vehicle is JF1GDAKD

Currently, I am thinking about getting a Bozz Speed Downpipe (60 to 65mm) with a second hand STI midpipe and muffler.

Questions for the experienced

1. Will I be expecting any boost spikes or CEL alone with No Engine management?

2. Will I be running into the OL/CL delay problem with a European WRX?

3. I am looking to buy a Bozz Speed DP from a local guy who buy from Japan and sell parts locally. He claims that the DP is a 60mm one and will give a gain of 20 bhp midrange and should retain the low end torque just as the stock DP will. But, however, I canít seem to find this DP on the web anywhere after hours of searching including the Bozz Speed websites and scoobies' forums.

Could I potentially be buying a non genuine Bozz Speed's DP or a copy?
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Old 05-06-2006, 03:58 PM   #2
Jasper
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60mm is a smaller than average dp.

60mm= 2.65" or so?

there's little torque to retain on a turbo motor. the turbo is still a MUCH bigger restriction than any DP you could put on. you (ideally) want the free-est flowing exhaust possible.

HKS downpipe for the win. 3" for $175shipped.


and no idea on the european spec motor. is it an EJ205? (if it is, then yes, EM is HIGHLY recommended)
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Old 05-07-2006, 02:50 AM   #3
accelguy
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Hi Jasper,

Thanks for the advice. May I make clear that my tuning route will be keeping the stock turbo while swapping out the intake (K&N panel already installed), TBE and AP when Cobb releases one for the Euro WRX (in the last email we exchanged, they mentioned that it is underdevelopment).

As for the free-est flowing exhaust possible (quickest flowing), I think you are right with what you mentioned. But, however, having a free-est flowing exhaust such as a 3" DP on my 05 WRX may cause the turbo to over spin thus create the unwanted boost spikes. Am I right to think that a smaller DP (60mm = 2.36") will create less or even no boost spikes? Please feel free to share on this and correct me if I am wrong.

The problem is that I cant find any reputable tuners here at where I am based. Are there any other Engine managements that user like me may have a go at installing one by myself?

Last edited by accelguy; 05-07-2006 at 05:33 AM.
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Old 05-07-2006, 09:08 AM   #4
Jasper
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even without an AP, there's probably still a UTEC or EcuTek tuning available for your cars. Ecutek is pretty exclusive to a tuning shop, so you'd be paying for each retune. UTEC is pretty user friendly, but doesnt have *all* of the features of StreetTuner for the AP (and when ST releases new updates for the software, which is bound to happen sometime, it'll probably be even more powerful than it is now)

as for the exhaust, the DP is NOT the bottleneck in your exhaust system. the TD04's rather small hotside is. the 3" downpipe wont be any more of a restriction than the 60mm, or vice versa. if you're worried about boost spikes, you could look into a bellmouth downpipe (more money, ~ $285ish shipped) to help flow, but thats still a 3", and on the TD04 offers no significant increase in power.



as for other EM's

EcuTek
AP (when its released for you) + StreetTuner
UTEC
Hydra (badass, but probably overkill)
AEM EMS (this thing is the BEST em i've ever played with, but its probably way too powerful for a basic setup, and its VERY expensive (~$2,000 w/ the good options)
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Old 05-09-2006, 12:50 AM   #5
bofh
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Get on the forums at www.openecu.org and www.tari.co.za where there are a lot more people from outside the US. They also will know exactly what is on your stock ECU, and what can be put there.
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Old 05-09-2006, 04:26 AM   #6
accelguy
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Hi bofh,

Thanks for providing me with the information. I will do that soon. Let's hope I will find out if my ECU will cope with the boost spikes and other potential problems that it might face upon a DP change.
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