Page 1 of 2 12 LastLast
Results 1 to 20 of 22

No top end (yet)

This is a discussion on No top end (yet) within the Computer & Tuning forums, part of the LSx Technical Help Section category; Finally got to the track. Geo Tracker with 98 LS1/ 4L60e with stock everything except open element air filter, no ...

  1. #1
    Junior Member
    Join Date
    Jan 2012
    Location
    Indiana
    Posts
    8

    Red
    1997 Geo Tracker w / LS1

    No top end (yet)

    Finally got to the track. Geo Tracker with 98 LS1/ 4L60e with stock everything except open element air filter, no cats and true 2.5 dual exhaust and turbo mufflers. Ford 8.8 posi rear with 3.73:1s. On a crazy hot day it spun hard in first two gears on a greasy track ran a string of 13.02-13.06 runs at 104.7-105.2 mph, 60' times were 1.93 to 1.98. I popped the right headlight out and spun the air intake tube around for a cheap cold air and picked up to a best of 12.75 with most in the 12.82 range at 105.8 to 106.9 mph and the 60' times dropped to 1.919 avg, and a best of 1.869. It leaves hard but I think at 2900 lbs with me in it it should easily top 109 to 111 mph. It has not been tuned and I haven't even swapped the plugs that came in the Ebay motor. I have less than $6K in the whole deal including the Tracker and the wheels and tires so I am just getting started. I plan to do the usual stuff, LS6 intake, 3000-3500 stall convertor and cam but wanted to know how much I can expect with just a good tune on the stock motor? By the numbers my horsepower is down below 275: I have friends topping 108 with their F-bodies. FYI, it ran great, no missing or bogs and went through the lights at 5100 rpm and was amazingly consistent. The track didn't help as I had to leave from idle or spin and it spun in second most of the time. On the few runs with no wheel spin the best mph was 106.93 so still down on power. With the windows down it smells rich on top so I hope a tune will get me 20-30 hp minimum.

  2. #2
    Moderator Firebirdjones's Avatar
    Join Date
    May 2006
    Location
    Arizona
    Posts
    12,552
    What a fun ride that should be. With a short (and narrow) wheel base, I wouldn't want to be sideways for too long That's just not something I want to go fast in.
    On my bone stock 02 SS a simple tune done by me with HPtuner got me a solid 3 tenths and nearly 3 mph. So I'd guess a solid 20 hp isn't out of the question in my case.

  3. #3
    Veteran 0rion's Avatar
    Join Date
    Aug 2005
    Location
    ohio
    Posts
    22,519

    98 Formula
    06 duramax

    geo tracker for real?? Man..... I love the imagination and ingenuity you guys have. What an awesome transplant. A tune would be a good thing to have....put a wideband in it too so you know where your AFR is all the time. It's such a cheap tool to buy ( ~$170 shipped for an LC-1) and takes a lot of guess work out as far as how rich/lean you might be. If the stall is in the immediate future wait until you get that and/or some mods on there to get the most bang for your buck with the tune.

  4. #4
    Junior Member
    Join Date
    Jan 2012
    Location
    Indiana
    Posts
    8

    Red
    1997 Geo Tracker w / LS1

    It's been a lot of fun, I kept stock looking steel wheels and pretty quiet turbo mufflers so it's a sleeper and has surprised a lot of local cars. On the street it will just barely turn the tires and leaves harder than at the track. Even when it spun it went dead straight and was absolutely drama free through the traps. I've had to to 128 by the GPS and it was stable but the top wants to come off. All and all a fun project and I drive it to work daily.

  5. #5
    Junior Member
    Join Date
    Jan 2012
    Location
    Indiana
    Posts
    8

    Red
    1997 Geo Tracker w / LS1

    Thanks, it has been great so far, I've put about 1000 miles on it with zero issues. It got 22 mpg on the drive to the track and I made 21 or 22 passes with most of them hot laps and it never got over 205°. I may try to fins someone in Indy for the stock tune but soon hope to get the wide band O2 and Hptuner and try my hand at tuning. It still has the stock intake but I have removed the EGR and air pump. This was my first EFI project and the wiring was a little daunting but there is so much good info online I got through it pretty quickly.

  6. #6
    Junior Member bmax327's Avatar
    Join Date
    Aug 2005
    Location
    b'tween a rock & a hard place.
    Posts
    22

    Black
    1999 Formula

    Pictures?

    Sounds like a fun project.

    Brad
    1999 Formula, M6, mostly stock daily driver. ARH Headers, Hooker cat back, Koni's. EFI live V2, LC-1 serial connection. BRE custom cam

  7. #7
    Junior Member
    Join Date
    Jan 2012
    Location
    Indiana
    Posts
    8

    Red
    1997 Geo Tracker w / LS1

    Pictures

    Here is a video from when it had the stock rear end with 4.3:1 gears and stock tires. It would break them loose at 55 mph. With the 3.73:1 posi and Toyo R888s the only time it spins is at the track.




  8. #8
    Junior Member
    Join Date
    Jan 2012
    Location
    Indiana
    Posts
    8

    Red
    1997 Geo Tracker w / LS1

    Here is a parking lot launch from idle with the Toyo R888s.


  9. #9
    Moderator Firebirdjones's Avatar
    Join Date
    May 2006
    Location
    Arizona
    Posts
    12,552
    One word.................Hilarious!!!

  10. #10
    Junior Member smokestack's Avatar
    Join Date
    May 2011
    Location
    Terre haute IN
    Posts
    74

    blue
    2001 silverado

    I bet that would be alot of fun lol

  11. #11
    Junior Member
    Join Date
    Jan 2012
    Location
    Indiana
    Posts
    8

    Red
    1997 Geo Tracker w / LS1

    Swapped plugs and wires tonite and moved the turnsignals down into the bumper to allow cold air in to the air filter and PCM. Also did the coolant bypass on the TB while I was in there. Plan to check the throttle blade tomorrow and possibly do the stop mod if it isn't opening fully.

  12. #12
    Junior Member
    Join Date
    Jan 2012
    Location
    Indiana
    Posts
    8

    Red
    1997 Geo Tracker w / LS1

    Found problem< no power to MAF or O2s, running in open loop. Should get better mileage and hopefully run a little better since I believe it would revert to low octane tables with code P0102. Will try to disconnect battery tomorrow to clear code and hope to pick up my missing 20 - 25 hp (remember it was high 90šs). Shift smoother with MAF powered up!

  13. #13
    Junior Member
    Join Date
    Jan 2012
    Location
    Indiana
    Posts
    8

    Red
    1997 Geo Tracker w / LS1

    12.49 @ 109.6

    Picked up to a best of 12.49 ET and 109.6 mph with MAF hooked up but it has a miss at around 5000-5500 rpm at the top of second gear now.
    Attached Images Attached Images

  14. #14
    Impounded
    Join Date
    Jul 2012
    Location
    new york
    Posts
    4
    What I am getting is that you are looking for some sort of fruitful and prolific information regarding wheels and tires. I would suggest you to thoroughly test their durability before you bargain for them, or make any decision regarding them.

  15. #15
    ʢ ൧ ൨ ൩ ൪ ൫ ൬ ൭ ൮Ր Ց Ւ Փ Smittro's Avatar
    Join Date
    Feb 2009
    Location
    Pittsburgh
    Posts
    9,965

    White
    2008 Hummer H3

    Quote Originally Posted by Nicholleren View Post
    What I am getting is that you are looking for some sort of fruitful and prolific information regarding wheels and tires. I would suggest you to thoroughly test their durability before you bargain for them, or make any decision regarding them.

  16. #16
    Senior Member tatertot91's Avatar
    Join Date
    Oct 2008
    Location
    Coral Springs, Fl
    Posts
    5,773

    Sunset Orange Metalic
    2001 Camaro SS

    that last post had me confused as well
    cool project, the launch made me laugh a bit

  17. #17
    Member SuperSSguy's Avatar
    Join Date
    Jul 2012
    Location
    NorCal
    Posts
    979

    Sunset Orange Metallic
    2002 Camaro SS M6

    Quote Originally Posted by Firebirdjones View Post
    What a fun ride that should be. With a short (and narrow) wheel base, I wouldn't want to be sideways for too long That's just not something I want to go fast in.
    On my bone stock 02 SS a simple tune done by me with HPtuner got me a solid 3 tenths and nearly 3 mph. So I'd guess a solid 20 hp isn't out of the question in my case.
    When you did the tune yourself..what did you adjust?... and how did you know what levels or degrees to set ?...What i mean is like if you set your AFR or fuel trims etc.. how do you know how high/low to set it at? Just curious?
    Last edited by SuperSSguy; 08-05-2012 at 01:01 AM.

  18. #18
    Junior Member smokestack's Avatar
    Join Date
    May 2011
    Location
    Terre haute IN
    Posts
    74

    blue
    2001 silverado

    Quote Originally Posted by SuperSSguy View Post
    When you did the tune yourself..what did you adjust?... and how did you know what levels or degrees to set ?...What i mean is like if you set your AFR or fuel trims etc.. how do you know how high/low to set it at? Just curious?
    Either a wideband or data log alot and pull some fuel and add some timing. Much easier with a wideband though...And safer.
    Thats me though

  19. #19
    Member SuperSSguy's Avatar
    Join Date
    Jul 2012
    Location
    NorCal
    Posts
    979

    Sunset Orange Metallic
    2002 Camaro SS M6

    Quote Originally Posted by smokestack View Post
    Either a wideband or data log alot and pull some fuel and add some timing. Much easier with a wideband though...And safer.
    Thats me though
    Yeah ok but what tells you how much fuel to pull and what degree of timing to add or subtract.? what do you use as a base? How do you know if your adding to much or too little?I know on a dyno that it reads your hp and tq curves etc. so you can use that to adjust the parameters ..i guess i need to take a course/class on tuning?

  20. #20
    Moderator Firebirdjones's Avatar
    Join Date
    May 2006
    Location
    Arizona
    Posts
    12,552
    The ability to know what an engine is going to like comes from alot of tuning experience and some knowledge of how a combustable engine works. What AFR makes best all around power, how much timing a particular combustion chamber design likes for best power etc...These are generalizations without getting into too many specifics. With that knowledge you can dial in any engine pretty darn close without the dyno (although that's a big help).
    The track is another good place to make tuning tweaks by watching your mph.

    For instance an LS engine has a modern heart shaped combustion chamber (as most aftermarket heads now do) which doesn't require so much ignition lead. Because of this, LS engines tend to make best power with total timing under full load of about 24-28 degrees. 24 might be a safe starting point to work from. A safe AFR to command for a naturally aspirated engine under full load may be something like 12.6-12.8, and then work from there. Some stay on the safe side, others push the limits to squeak a few more HP.

    With the computer you can log variables like timing and fuel, and use a wideband while logging, and know exactly what changes to make.

Page 1 of 2 12 LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •