SBC tuner turned DSM. Please help- Researched.

[JLangevin]

Hey guys. I have been here a few weeks, but have not really posted until now. I have some questions, I thank one for help in advance.

Car: 1995 GST Stock T-25 Turbo (15psi)
Miles 144,XXX - Rebuilt recently with 178, 180, 177, 181 compression
Mods: 2.5" Catback with Magnaflow
Greddy BOV
MBC
Autometer Boost Gauge
Autometer A/F Ratio Gauge
Aircan cutout
K&N Filter Replacement
Hard upper pipe


I have been deep into the Small Block Chevy crowd for years. I owned a 1992 Z28 25th Anniversary Camaro for 6 yrs and recently traded it for my DSM. I'm very happy and haven't looked back, but am now needing some help, as I know nothing about Turbos and its supporting system, other than what I try to absorb reading all the tech articles late at night.

My car is peppy, but I'm sure its losing power due to a faulty O2 sensor. I have a non wide-band A/F Gauge that shows rich all the time. The richest most LED on the A/F Gauge stays lit at all times, and VERY rarely swings back and forth like my gauges on my other cars do. I know this isn't a wideband system, but staying on one rich LED at all times to me doesn't sound right, and I'm sure its hurting my performance. Not to mention I get roughly 210 miles to the tank, even when attempting to stay out of the boost. Typical back and forth to work stuff, no racing etc.

The car certainly smells rich at times but before I go replacing a potentially pricey O2 sensor (compared to SBC parts), I want to get some input.

I plan on the following mods by Christmas
-2.5" Downpipe
-Ported O2 housing
-ported manifold
-ported wastegate
-14B
-550cc
-190pump

I'm looking for a nice mid 13sec daily driver. I think this setup will do it, or at least I hope it will.

 

[Mike Marnik]

Ya you have a bad o2 sensor it should be going back and forth. I would also reccomend getting a data logger they are probally one of the best things you can buy for your car for tuning and sorting out problems and reading cel's. Also i would go with a Walbro 255 instead of a 190 I believe they are the same price and it will give you more room to modify. Also you are going to need a Fuel Pressure Regulator. hope this helps and good luck with the dsm.

 

[JLangevin]

Do you have a link you can send me to about how to data log? I have a palm pilot not doing anything, but would like to know how to set it up. Thanks!

 

[Mike Marnik]

http://www.pocketlogger.com/index.php?pid=dsm that is the software i use. It come with cable and software. I used some of the free stuff but its didnt compare to that. That software is very very easy to operate. Hope that helps. It has probally been the best thing i bought for my dsm and it just got stolen im so mad. good luck.

 

[JLangevin]

Well seeing as I am a 2G 95, Im certain I will need the OBDII cable. Thanks for the link though, I found that shortly after posting. The cabel is pretty pricey, but if it comes with the software, Im sure its worth it.

 

[Mike Marnik]

Ya it does come with software and i would say that it is very worth it. There is also something else out there called dsm link im not very uptodate on if but if you search im sure you will find plenty of info on it.