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Old 07-16-2003, 06:14 PM   #1
SCOOBER
Scooby Newbie
 
Member#: 223
Join Date: Sep 1999
Location: Ohio
Vehicle:
1999 Impreza 2.5RS-T
Aspen White

Default '99 RS-T Observations

I have a '99 RS-T that I have about 1000 miles on since the turbo addition. I posted a little while back concerning some issues I was having where the car would bog really bad when trying to accelerate from a stop....or just press the gas pedal while sitting still. This is what is on the car...
99 SOHC motor-105K
WRX pump / injectors
WRX header, up & downpipes, exhaust
WRX turbo / I/C
Vortech RRFPR - 3:1
Parallel fuel mod

I finally got an SAFC II and I found out that the car was not getting enough fuel on the low end...which I thought was odd since all the fuel items had been upgraded...so I played around with it a little and I set the low throttle at 35% up to 2800rpm. The car now idles and leaves lights like it had never been modified. I also was getting alot of extra fuel at full throttle (and on boost) so I changed the RRFPR to the 3:1 (was 4:1) and lowered fuel at high throttle to -8% from 3000rpm. The car runs very well now and is pretty quick...plus my wife and I drove about 120 miles yesterday (90 degrees out) with the air on and no problems at all. Just thougt this might be helpful to anyone trying to run this setup...as I was getting really frustrated with the low end thing.
Oh, the other thing I wanted to know was if anyone else had experienced this kind of problem on their setup...and why it would be fuel starved with a bigger pump and injectors?

Also of note - I just had my car echecked and it passed with flying colors....better than the las test two years ago when the car was stock!!
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Old 07-17-2003, 02:11 AM   #2
scoobyimprza
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Member#: 24956
Join Date: Sep 2002
Chapter/Region: MAIC
Location: Littlestown PA
Vehicle:
1997 Impreza WRX
Steel Blue Mica

Default

did you tune it yourself with the SAFC? how hard was it to do? how much experience have you had with tuning? where'd you get the SAFC and is it the brand new one? thanks!

Brent
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Old 07-17-2003, 11:09 AM   #3
SCOOBER
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Member#: 223
Join Date: Sep 1999
Location: Ohio
Vehicle:
1999 Impreza 2.5RS-T
Aspen White

Default

Well, I have never "tuned" anything before...and I guess technically I still haven't...but I used the A/F guage and the EGT to tweak the low end and then just did some runs with the car to change the high throttle...it really didn't take long, but the difference in the car was night & day! If you ignore the turbo noises you wouldn't know the car had anything done to it...other than the fact that it is much faster now. I have totally eliminated all the little flat spots in the acceleration and the hesitation is completely gone. We shall see how it goes from here, but so far, so good!
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Old 07-17-2003, 11:20 AM   #4
scoobyimprza
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Join Date: Sep 2002
Chapter/Region: MAIC
Location: Littlestown PA
Vehicle:
1997 Impreza WRX
Steel Blue Mica

Default

thanks for the info, it should help. where'd you get your SAFC and is it the brand new Ver II?
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Old 07-17-2003, 11:20 AM   #5
jin88
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Join Date: Nov 2002
Default

What kind of turbo are you using???
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Old 07-17-2003, 12:23 PM   #6
Charge
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Member#: 3313
Join Date: Dec 2000
Chapter/Region: MWSOC
Location: Cincinnati
Default Re: '99 RS-T Observations

Quote:
Originally posted by SCOOBER
Also of note - I just had my car echecked and it passed with flying colors....better than the las test two years ago when the car was stock!!
Good to hear. One of my main concerns, being in Ohio as well, is E-Check. I noticed how easily my stock car just passed, well under the requirements(I'm talking extremely below). Since there was no visual inspection done(although they are supposed to check for cats...but I think if they just see a bulge in the pipe, they assume it's there), I assumed I could pass with a swap or a turbo'd motor.

What kind of exhaust mods do you have? What type of muffler are you using? Do you have cats anywhere?

I'd appreciate the info for my own E-check woes in two years from now. Feel free to PM me if you'd rather not divulge something here.

Thanks,
Neil
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Old 07-18-2003, 02:10 AM   #7
SCOOBER
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Member#: 223
Join Date: Sep 1999
Location: Ohio
Vehicle:
1999 Impreza 2.5RS-T
Aspen White

Default

The SAFC is the new one with the dial...and I got it new from options, as Apexi said they are an authorized dealer and the unit is a U.S. model with english instructions. The cool thing is that the case is all black and the display lighting is white...it hides nicely below the radio for now.
I am using a WRX turbo and running a borrowed stock WRX exhaust...no mods to the exhaust yet, so I am using 3 cats...uggh. The setup is still pretty quick and the exhaust is very quiet...more turbo noise than anything else. I need to do a few other things then I will upgrade the exhaust. I got screwed out of a stock exhaust by ROBPA....he has my $100 and the exhaust he said he shipped on several different occasions...so I am using a friends from his WRX for now. Anyway, as far as the car running well, I am very pleased at this point...and when the exhaust is opened up, I am sure the smile will only get bigger!!

I was able to pull slightly on my friend in his Audi TT running "slightly more than stock" boost on a 1.8T from a rolling second gear through third pull with a passenger....so I thought that was okay. The power off boost is the same as before...not that it matters since boost starts at 2k and is pretty much at 5psi before you even hit 2.5k. I think the turbo might be a little small for the application, but I am not that well versed on sizing at this point.
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Old 07-18-2003, 10:31 AM   #8
mpaone
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Member#: 3
Join Date: Jun 1999
Chapter/Region: South East
Location: Alfretter Geeoja
Vehicle:
2012 Geeteeeye
and 71' VW Gulf Beetle

Question

I'm guessing you had to run a different (turbo) crossmember, or did you cut yours?

-Mike.
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Old 07-19-2003, 02:55 AM   #9
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Join Date: Sep 1999
Location: Ohio
Vehicle:
1999 Impreza 2.5RS-T
Aspen White

Default

Hey...someone from home!! Ah...the land of smooth roads and no snow!! I used a Legacy Turbo crossmember...and I had to borrow yet another part from a friend locally...the front swaybar would not fit, so I had to use the one off Puckavelli's JDM motor / pile o' parts...'94, I think...but it fit perfectly.

New observation....in colder weather...I think it is about 50f here right now...the car was getting a little hesitation while the a/f was showing alot richer than earlier in the night...then I realized it was pushing a consistent 6-7psi, which causes the RRPFR to increase fuel into the "too rich zone". Interesting change in boost behavior just due to weather. I normally get about 4-5psi...maybe 7 for a split second then the gate opens and 4-5 is back. Tonight it would do it in any gear and stay there until I let off the throttle. I also threw a C/E so I have to pull that tomorrow.
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