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09-03-2014, 12:20 PM
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#1 |
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Senior Member
Join Date: Nov 2003
Location: Donaldsonville, LA
Posts: 983
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Liked 229 Times in 71 Posts
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Re: Ls1 tuneup help
What Mph does it run at 1/8 and 1/4?
What does convertor stall too and what type of trans and first gear ratio? What is the weight of the car? What engine management system do you have?
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Jimmy "Cooter" Hidalgo, Jr. 4865 E/SA '04 GTO 4865 SS/GA '99 Firebird |
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09-03-2014, 12:55 PM
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#2 |
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Member
Join Date: Jul 2006
Location: waldorf
Posts: 222
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Liked 55 Times in 29 Posts
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Re: Ls1 tuneup help
Last time out at 2500ft it went 127+ in 1/4 102 1/8 it weighed 3330 lbs it has the big stuff management system.
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09-03-2014, 01:11 PM
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#3 |
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Senior Member
Join Date: Nov 2003
Location: Donaldsonville, LA
Posts: 983
Likes: 17
Liked 229 Times in 71 Posts
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Re: Ls1 tuneup help
What does the convertor flash too and what type of trans is it?
__________________
Jimmy "Cooter" Hidalgo, Jr. 4865 E/SA '04 GTO 4865 SS/GA '99 Firebird |
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09-03-2014, 01:33 PM
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#4 |
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Member
Join Date: Jul 2006
Location: waldorf
Posts: 222
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Liked 55 Times in 29 Posts
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Re: Ls1 tuneup help
According to the data logger 5700 rpms the trans is a ati 350. It is not my car so I will have to check if it is standard low gear or 2.75 low gear
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09-03-2014, 01:42 PM
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#5 |
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Senior Member
Join Date: Nov 2003
Location: Donaldsonville, LA
Posts: 983
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Re: Ls1 tuneup help
Sounds like the convertor is pretty close. It should definitely have a 2.75 first gear, and the final gear should be atleast 4.88. You need to look at the data log and check the Air to fuel ratio on the convertor flash and down track. The A/F ratio should be around 13.0 +/- .5 depending on what the car likes. If it is in the tune up, it would most likely be off on the hit of the throttle and into the flash of the convertor to have the 60ft that far off. You should be running atleast 10.40s with that mph. If possible, I would highly recommend changing to FAST Fuel injection in the future. Their software is much more user friendly, and their service at the track is unbeatable.
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Jimmy "Cooter" Hidalgo, Jr. 4865 E/SA '04 GTO 4865 SS/GA '99 Firebird |
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09-03-2014, 01:55 PM
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#6 |
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Member
Join Date: Jul 2006
Location: waldorf
Posts: 222
Likes: 14
Liked 55 Times in 29 Posts
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Re: Ls1 tuneup help
I agree with you. It should be going 40s in the summer and hopefully 20s in the good air. The a/f is right at 13 at the top of high gear it is in the 11s at the hit which is between 2800 and 3000 off the foot. Timing right now is 38 at the hit
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09-03-2014, 02:28 PM
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#7 |
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Senior Member
Join Date: Oct 2003
Location: Lower Slower Delaware
Posts: 535
Likes: 22
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Re: Ls1 tuneup help
11 is pretty fat even if you want some fuel there for the load. Lean it out to 12.X and see if it picks up.
A good tuner would get you in the ballpark in a few pulls on a chassis dyne, know it's a hike but Danbury Chassis Dyno is very good.
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Frank Ferrucci I/SA 1271 "Be Thankful for the Gifts You are Given" |
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