Who's your daddy?... 14.57 @ 97.29mph
10-17-02, 12:34 PM
#18
Lexus Champion
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Originally posted by GTPED
Very imperessive!! I will be going to a drag racing event with my other car club and I am considering taking my 1995 LS400 and making some runs. My car is stock other than an open cone I put on. I ordered the cone to fit right over where the stock airbox was removed. The air passage in the front is now aimed directly at the open cone. I had to make a small bracket to keep the cone from resting on the steel lines below it, but that was it. Took 15 minutes and the difference was VERY noticeable! What do you think I could run in the 50 degree weather we have here? Any launching or shifting tips you could give would also be appreciated! Again, VERY nice times!!
Very imperessive!! I will be going to a drag racing event with my other car club and I am considering taking my 1995 LS400 and making some runs. My car is stock other than an open cone I put on. I ordered the cone to fit right over where the stock airbox was removed. The air passage in the front is now aimed directly at the open cone. I had to make a small bracket to keep the cone from resting on the steel lines below it, but that was it. Took 15 minutes and the difference was VERY noticeable! What do you think I could run in the 50 degree weather we have here? Any launching or shifting tips you could give would also be appreciated! Again, VERY nice times!!
Yours looks like a good mod but I would strongly suggest fabricating a cold air box that separates the hot under hood air from the filter. My guess is that you have better throttle response but actuall power gain potential of the higher flow is offset by the higher inlet temperatures. Remember the air coming out of the radiator is near 200 degrees :eek: So, fabricate an air box. Start with corregated cardboard and try a few designs. Also, don't forget to remove the seal around the headlight. The seal behind the light assembly that attaches to the inner front metal wall around the light. This will allow much more COLD air to enter your airbox area.
On a 95 LS400 the peak power is at 5600rpm and the tranny shifts around 6000 if left in drive so leave it there, you won't gain anything from manually shifting. Launch by power braking the engine to about 2000rpm against the converter and let off the brake on the last yellow. I only made 3 passes on my 96 LS400 and the best was a 15.4xx at 91.xx mph. Good luck and let us know how you do.
Last edited by JBrady; 10-17-02 at 12:44 PM.
10-17-02, 05:05 PM
#19
Lexus Champion
Thread Starter
Originally posted by tomtnc
I admire your current ET and your enthusiasm, but a TC alone will not put your 14.57 LS4 in the 13's. I share this with you based on personal experience; I have over 15 years of drag racing experience with daily-driven street cars, the latest were an 11 second FBody and Vette.
1. Your vehicle will not see 1.5x 60' ET gain at the end of the track. You will see 1.1-1.2x gain at the most for a car with your traction capabilities and horsepower. To note, you will likely see a drop in 1/4 mph with improved 60' ET.
2. I estimate you would gain -0.2s ET at the most in 1/4 with only a TC due to your current "one-leg" differential setup (traction). Add an LSD with the TC, and you will land solid low 14's and possibly have a chance at the low 13's given optimal weather and track conditions.
I am certainly impressed with your ET given the weight of your car and minimal mods. I think you are only a TC, LSD, and a 50 degree day at the track with 25mph tail winds away from the 13's! Good luck.
Tom
I admire your current ET and your enthusiasm, but a TC alone will not put your 14.57 LS4 in the 13's. I share this with you based on personal experience; I have over 15 years of drag racing experience with daily-driven street cars, the latest were an 11 second FBody and Vette.
1. Your vehicle will not see 1.5x 60' ET gain at the end of the track. You will see 1.1-1.2x gain at the most for a car with your traction capabilities and horsepower. To note, you will likely see a drop in 1/4 mph with improved 60' ET.
2. I estimate you would gain -0.2s ET at the most in 1/4 with only a TC due to your current "one-leg" differential setup (traction). Add an LSD with the TC, and you will land solid low 14's and possibly have a chance at the low 13's given optimal weather and track conditions.
I am certainly impressed with your ET given the weight of your car and minimal mods. I think you are only a TC, LSD, and a 50 degree day at the track with 25mph tail winds away from the 13's! Good luck.
Tom
10-17-02, 06:19 PM
#20
Originally posted by jbrady
Oh yeah, they finally repaired the scale. My LS400 with me in it, just under a 1/2 tank of gas, no spare/jack/etc. weighs 3991 lbs.
For the fun of it I pulled up a horsepower calculator at
http://www.4racecars.com/calculators...alculator.html
and it gave me what I consider the VERY optimistic result copied below.
"Horsepower Results - 1/4 Mile Method
Your Lexus weighs about 3991 pounds and can complete a 1/4 mile in about 14.57 seconds. That means that you've got about 255.03 HP at the wheels, and about 331.54 HP at the flywheel."
Oh yeah, they finally repaired the scale. My LS400 with me in it, just under a 1/2 tank of gas, no spare/jack/etc. weighs 3991 lbs.
For the fun of it I pulled up a horsepower calculator at
http://www.4racecars.com/calculators...alculator.html
and it gave me what I consider the VERY optimistic result copied below.
"Horsepower Results - 1/4 Mile Method
Your Lexus weighs about 3991 pounds and can complete a 1/4 mile in about 14.57 seconds. That means that you've got about 255.03 HP at the wheels, and about 331.54 HP at the flywheel."
10-17-02, 07:18 PM
#21
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Originally posted by jbrady
Tom, thanks, and you may be right on the 60 foot factor. However, I did NOT say a TC alone would get me 13s. An LSD was the first thing I talked about THEN a TC. A TC alone would make it harder to launch with my peg-leg differential and would probably hurt my ETs.
Tom, thanks, and you may be right on the 60 foot factor. However, I did NOT say a TC alone would get me 13s. An LSD was the first thing I talked about THEN a TC. A TC alone would make it harder to launch with my peg-leg differential and would probably hurt my ETs.
From everything I've researched on the LS and GS4, (currently searching for a GS4 to purchase and of course modify) I still think .5-.6s ET reduction from LSD and TC is a lofty goal. However, that goal is certainly achievable if you can get that "thrown in" with the deal you made with the devil to nail a 14.57 ET on a LS4 w/ only cold air and mild exhaust modification - LOL.
I truly admire your car and the results you have attained thus far. Once again, best of luck and I look forward to seeing 13's from you in the near future.
Tom
10-18-02, 12:52 AM
#22
Lexus Champion
Thread Starter
Originally posted by tomtnc
My apologies for the misread on your statement.
From everything I've researched on the LS and GS4, (currently searching for a GS4 to purchase and of course modify) I still think .5-.6s ET reduction from LSD and TC is a lofty goal. However, that goal is certainly achievable if you can get that "thrown in" with the deal you made with the devil to nail a 14.57 ET on a LS4 w/ only cold air and mild exhaust modification - LOL.
I truly admire your car and the results you have attained thus far. Once again, best of luck and I look forward to seeing 13's from you in the near future.
Tom
My apologies for the misread on your statement.
From everything I've researched on the LS and GS4, (currently searching for a GS4 to purchase and of course modify) I still think .5-.6s ET reduction from LSD and TC is a lofty goal. However, that goal is certainly achievable if you can get that "thrown in" with the deal you made with the devil to nail a 14.57 ET on a LS4 w/ only cold air and mild exhaust modification - LOL.
I truly admire your car and the results you have attained thus far. Once again, best of luck and I look forward to seeing 13's from you in the near future.
Tom
DrRick
10-21-02, 01:15 PM
#26
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Thread Starter
Originally posted by SWEETSOUND2001
Jbrady, BTW, a GS430 was tested 13.9 @ 103 by Motor Trend
Jbrady, BTW, a GS430 was tested 13.9 @ 103 by Motor Trend
10-21-02, 01:28 PM
#27
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www.car-stats.com
They have 1/4 mile times for most cars...great site but be sure to have your pop-up killer on
They have 1/4 mile times for most cars...great site but be sure to have your pop-up killer on
10-21-02, 04:00 PM
#28
Lexus Champion
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Originally posted by SWEETSOUND2001
Jbrady, BTW, a GS430 was tested 13.9 @ 103 by Motor Trend
Jbrady, BTW, a GS430 was tested 13.9 @ 103 by Motor Trend
Does anyone have the Motor Trend June 2001 issue?
I would like to get the details of the test? Sometimes magazines test in cold weather, sometimes they give estimates, some tests use 3rd wheel timers and or other items. This is by far the quickest/fastest I have seen reported by a car mag and would like to know the details.
10-21-02, 06:10 PM
#29
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Jbrady
I have a library of ALL car mags from 1988 at home. I will see if I have the one your looking for. From time to time I dont have one issue cause I lent it to someone or my subscription happend to run out.
I'll let you know. If I have it I'll scann it in and email it to you.
I have a library of ALL car mags from 1988 at home. I will see if I have the one your looking for. From time to time I dont have one issue cause I lent it to someone or my subscription happend to run out.
I'll let you know. If I have it I'll scann it in and email it to you.
10-21-02, 06:32 PM
#30
Lexus Champion
Thread Starter
Thanks man, I am sceptical of magazine numbers anyway but when a third party lists times from a magazine I like to know the details.
I have no doubt that under the right conditions and in the right hands 
that a GS430 could post those numbers. Just would like to see how it was done.
I have no doubt that under the right conditions and in the right hands
that a GS430 could post those numbers. Just would like to see how it was done.