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Old 08-30-2002, 03:58 AM   #1
andygold
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Join Date: Jun 2001
Location: North Country, New York
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2002 Impreza WRX
WR Blue

Default TXS stage 2 questions

Just had the stage 2 plus the uppipe installed. What I'm noticing is more turbo whine at low rpms(very rarely ever heard it at all with stage 1), as well as a loud sucking sound at WOT(never heard that before). Is this being heard maybe because of 2 less cats, or bigger pipes?( I still have the intake silencer in-place).
I do not know if these noises are normal, or possibly caused by the all too common leaks people are having with their uppipes, for example.

Also, after doing searches, I could not find an answer for this either....Along with the install, I had an EGT probe put into the manifold near cylinder three. I'm running about 1450 F at steady throttle 80 MPH highway driving. And, if I'm pushing the car, going WOT through the gears, it stays about the same temperature. What I'm seeing is...as I close the throttle between shifts, the EGT spikes up to around 1550 F. I'm assuming it's because I'm momentarily going lean with the reduced throttle. Am I correct with my assumption? And is this spiking normal?

Also, If I'm seeing 1450 at steady highway 80 MPH cruising, does this still tell me that with "my probe location", 1650 would be the melting point for engine internals? To rephrase...for example...If I had installed the probe further away from the cylinder( such as the top of the uppipe), the EGT at the same driving conditions would read lower, lets say about 1200 F, giving me a safety margin of about 450 F , while in actuallity, I'd be seeing much higher temps at the cylinders. So...with probe at cylinder 3, at steady 80 mph cruise, does 1450 F sound about right, and if so, can I still use a reading of 1650 F as the danger zone? Wow, now even I'm confused!!!
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Old 08-30-2002, 05:44 AM   #2
kdawg
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I also have stage 2 with up-pipe and I have the same question about the sucking sound. Infact, it sounds like fluttering type sound in my car.

I also have the turbo whine, that is normal.

Lastly, for the EGT, I have a similar inquiry.
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Old 08-30-2002, 10:35 AM   #3
sdecker
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Complete n00b Racing

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Hey guys:

I can't answer the EGT question for you, but I can assure you that the fluttering sound and increased turbo whine are part of the normal changes associated with the stage 2. I've had mine since January and it has always done both of those things. It's a little freaky at first but you get used to it pretty quick. I don't consider it to be a problem and I don't think think most people do either.

For the part-throttle EGT stuff, you might consider doing the TPS threshold mod. Read this thread:

http://forums.nasioc.com/forums/show...r&pagenumber=1

I've done this mod and it works great. So have many other people and the general opinion is that part throttle EGT's are reduced.

Good luck,

Scott
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Old 08-31-2002, 02:14 PM   #4
andygold
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I'm also curious....After installing all the piping, I still drove around with the Stage 1 chip for a day. The only thing I noticed from using the but dyno is that the car doesn't seem to drop into a hole when pulling into the street in 1st gear like it used to. It also seems to spool slightly quicker.

Then I pulled the Unichip and disconnected theharness, to get baseline EGT readings (as per TXS' suggestion). I then proceeded to intall the Stage 2 Unichip. I noticed absolutely no change in anything powerwise (Again this is just using the butt dyno)... only a slight drop in EGTs at steady state cruising. Then I got a CEL (probably cat efficiency...gotta get it pulled).

Should there be a marked, feelable difference in going from Stage 1 to Stage 2? I only felt the faster spoolup, along with some turbo whine, and some intake noise. At this point, would removing the intake silencer help any for power (I remember in Stage 1 it was only good for around 5 extra ponies)? If there is supposed to be greater power in Stage 2, where in the power band should it be felt (everywhere, low-end, high-end)? I looked at the dyno charts on TXS' website, but the increased power that the charts show, I can't feel (then again, my butt-dyno might need serious calibration )
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Old 09-01-2002, 10:06 AM   #5
z&cobb
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Quote:
Originally posted by andygold
I'm also curious....After installing all the piping, I still drove around with the Stage 1 chip for a day. The only thing I noticed from using the but dyno is that the car doesn't seem to drop into a hole when pulling into the street in 1st gear like it used to. It also seems to spool slightly quicker.

Then I pulled the Unichip and disconnected theharness, to get baseline EGT readings (as per TXS' suggestion). I then proceeded to intall the Stage 2 Unichip. I noticed absolutely no change in anything powerwise (Again this is just using the butt dyno)... only a slight drop in EGTs at steady state cruising. Then I got a CEL (probably cat efficiency...gotta get it pulled).

Should there be a marked, feelable difference in going from Stage 1 to Stage 2? I only felt the faster spoolup, along with some turbo whine, and some intake noise. At this point, would removing the intake silencer help any for power (I remember in Stage 1 it was only good for around 5 extra ponies)? If there is supposed to be greater power in Stage 2, where in the power band should it be felt (everywhere, low-end, high-end)? I looked at the dyno charts on TXS' website, but the increased power that the charts show, I can't feel (then again, my butt-dyno might need serious calibration )
I found that stage 1 was a very dramatic improvement over stock. When I picked up the parts for stage 2, TXS said they had to change to stage 2 programming to make it richer for the turboback system. That probably accounts for the drop in EGT that you saw. I don't remember the exact dyno numbers anymore but I think it runs something like stock 169, stg1 200, stg2 222 whp. That's 18% for stage 1 and 11% for going from stg1 to stg2. So your butt dyno should feel 11% more, under the same test conditions, which of course are had to remember, much less reproduce.
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Old 09-01-2002, 10:39 AM   #6
roybfr
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The flutter is the wastegate IIRC, it was there before just muffled by the stock DP. Go for a ride in the passanger seat of a stock car some time and you will hear alot of those noise that are being muffled.

Along with the Z said the difference between stage 1 and 2 is not as noticable as with stage one. Though how much boost are you running on stage 1 vs 2 are you still running 15 or have you bumped it up to 17 as that make a difference. After about a weeks driving the car seemed to come alive as the ECU did a little learning. I would also suggest changing out the ABC/Factory boost control for either some sort of EBC or MBC such as the TXS HPMBC. You will be very happy with the resuts.

On the EGT side at 1650 you engine is not going to instantly melt down. If you do a search back about 3 months or so Shiv posted a good FYI on EGT's.
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