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Old 07-12-2002, 04:05 PM   #1
eaalto
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Default Turbo project questions

Hi. I'm working on a turbo project for my '97 2.2 Impreza, and am generally following the guidelines at Unique Motorsports for his project. A few questions:

1. I did the serial-to-parallel fuel mod, and now I have a CEL (haven't gotten the code yet). Fuel pressure is at 2.0 kg/cm2, which is roughly 30psi. Is that what it should be? Unfortunately, I don't have a reading from before the fuel mod. Also, I installed the Walboro fuel pump and pressure went up slightly, which made the CEL go away. Next time I started up it was back to the original level and the CEL was back. Just using the stock FPR at the moment, btw. Thoughts?

2. I'm getting my downpipe from Unique Motorsports, and I'd like to have him put in the attachment for the relocated front O2 sensor. Unfortunately, I have to send it to him, and I'd rather not pull mine at this point to correctly size it. Does anyone know off-hand the attachment I need for the O2 on a '97 2.2 Impreza?

3. Are the Borla headers an improvement over stock for a turbo setup? Performance-wise, I mean; I don't care about sound.

Thanks.
-Emil Aalto
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Old 07-12-2002, 04:38 PM   #2
kastle
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3. Borla Headers.... I noticed that, with my EGT probe in the collector, my EGT's were 200* cooler on average with the Borla's than that of stock... Also, butt dyno suggested more power with the Borla's, but I have no number to verify that
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Old 07-12-2002, 04:58 PM   #3
Jewbaru
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#3 is pretty controversial. Do a search, and decide on your own. Most people say keep the stockers.
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Old 07-12-2002, 05:28 PM   #4
Portly
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kastle: The cooler EGTs at the collector would be expected - the uninsulated Borlas can shed a lot of heat by that point when compared to the insulated stockers. Hopefully you aren't using that point as a tuning reference, since your temps at your cylinder head are probably just as high. (edit: Which collector are you referring to? The first collector on the 2.2 is way back under the tranny, but I realize that this isn't true for the 2.5. I was assuming too much.)

eaalto: I thought (but haven't confirmed) that o2 sensors were a standard size. When I installed my TEC-2 I got a bung from an exhaust shop and they just handed me one. It worked perfectly. Then again, the TEC uses GM sensors, so that bit of information is probably useless.

Jeff
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Old 07-12-2002, 05:35 PM   #5
Mariano
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2.- There is an "universal" hex nut for most oxygen sensors, which is used by many local muffler shops in "custom- made" exhaust systems. When I was N/A I did my entire exhaust piping locally and I went to get this hex nut (grade 8) at a local store.

hope this helps!!!!

Mariano
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Old 07-12-2002, 06:03 PM   #6
kastle
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Portly - I wasn't using it for tuning purposes and currently have the 2.5 factory headers on the car... not that it's running... since I don't have a tranny...
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Old 07-12-2002, 06:05 PM   #7
Impreza Rider
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The thread for the o2 sensor is M18x1.5, that should help you find one. I'm actually using one of these on mine, I wanted something that looked nice, and not so..."industrial"

http://store.summitracing.com/produc...earchtype=ecat
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Old 07-12-2002, 11:09 PM   #8
yebokmj
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Default Dido

I am turboing the exact same car, MY97 2.2L Impreza L wagon, mine is white yours?
I can answer #1 since I have the fuel pressure gauge installed. I have a Greddy gauge that takes the readings in KG/cm2 as well so in stock form it read at idle just under 2.0 so about 1.9 or 1.95 at full throtle it's about 2.6. I have already done alot of preperation for my turbo install suspension, brakes gauges fueul computers, ect. I have the kit in my basement now all I need is money for clutch and hood. Keep in touch I would like to hear how your project goes, maybe compare notes.
Joshua
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Old 07-14-2002, 05:46 AM   #9
eaalto
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Thanks for the replies!

#1: Sounds like the pressure is ok, so it's probably something else or something temporary. I ordered an OBD-2 scanner, so I should figure it out soon.

#2: Great! Just the info I needed. I didn't want to yank the sensor what with reports about crossthreading and broken sensors, plus the usual hassle.

#3: I'll stick with the stock headers for now then. Save some $$.

yebokmj: yup, white 2.2 Outback Sport wagon. I've got the gauges and other electronics in, and am planning a brake upgrade (WRX rotors), better suspension (still unsure), clutch upgrade, and oil cooler install in the near future. The turbo itself will probably be a few months, though I've gathered most of the parts I need. Feel free to PM me if you want to talk about things.
-Emil
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