Best 1/4 mile times
08-22-09, 05:21 PM
#17
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the LIGHTEST LS' STILL weigh ~150-200lbs more than the SC400, and the SC400 came with 3.92 rear end gearing, which is much better for acceleration than our 3.27.
plus the car you looked at on dragtimes was a supercharged, intercooled, water injected, and possibly somewhat lightened SC400.
we have a ways to go.
plus the car you looked at on dragtimes was a supercharged, intercooled, water injected, and possibly somewhat lightened SC400.
we have a ways to go.
08-22-09, 06:51 PM
#18
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As note the 14.22 is my best times. That was on a 2.2 60ft which was due to traction limitations. Weather was near perfect with mid 40s temps and barometer above 30 inches.
My LS needs freshening up since it is at 150k miles on original spark plugs
On the above passes ( 3 separate 14.2 passes at 99mph) all it would have taken is a very reasonable 2.0 60 ft and I would have a 13 second time slip. Pretty respectable for a NA 4 liter 4000 pound car.
For me a stock engine with a performance tune such as the GS400/430 guys are starting to do plus a better exhaust (headers and cat back) should give my car a mid 13 second time potential at 100-105mph. That my friends will challenge more than a few "fast" cars. This is doable for a couple of grand.
BTW, I have the FREE LSD mod now so traction should be/is better.
I have been contemplating a low boost turbo design for some time but honestly have not rulled out a PROGRESSIVE port injected wet nitrous system of 100hp or less. With the above exhaust and tune with 100hp nitrous this should give a solid 400-420hp car (320-340rwhp) with 12 second potential.
I stress PROGRESSIVE as well as PORT and wet system. This would require drilling and fitting the intake with 8 separate foggers. A progressive system will give a starting shot of say 40hp and ramp up to the full 100hp as RPM climb. This will be safer and less stressful on the engine and transmission. It will also make the nitrous last longer. For a street application that rarely sees racing conditions this could well be the most practical approach. A properly designed twin turbo system will cost a minimum of $5k and probably run north of 10k before you know it.
My LS needs freshening up since it is at 150k miles on original spark plugs
On the above passes ( 3 separate 14.2 passes at 99mph) all it would have taken is a very reasonable 2.0 60 ft and I would have a 13 second time slip. Pretty respectable for a NA 4 liter 4000 pound car.
For me a stock engine with a performance tune such as the GS400/430 guys are starting to do plus a better exhaust (headers and cat back) should give my car a mid 13 second time potential at 100-105mph. That my friends will challenge more than a few "fast" cars. This is doable for a couple of grand.
BTW, I have the FREE LSD mod now so traction should be/is better.
I have been contemplating a low boost turbo design for some time but honestly have not rulled out a PROGRESSIVE port injected wet nitrous system of 100hp or less. With the above exhaust and tune with 100hp nitrous this should give a solid 400-420hp car (320-340rwhp) with 12 second potential.
I stress PROGRESSIVE as well as PORT and wet system. This would require drilling and fitting the intake with 8 separate foggers. A progressive system will give a starting shot of say 40hp and ramp up to the full 100hp as RPM climb. This will be safer and less stressful on the engine and transmission. It will also make the nitrous last longer. For a street application that rarely sees racing conditions this could well be the most practical approach. A properly designed twin turbo system will cost a minimum of $5k and probably run north of 10k before you know it.
08-22-09, 08:49 PM
#20
According to lexus.com specifications, the lightest sc400 I could find was 3604lbs for a 92 and 3655lbs for a 98. A 95 ls400 weighs 3650lbs. which means the sc ranges from 46lbs lighter to 5lbs heavier! The ls400 is so incredibly efficient that it is actually lighter than the all aluminum Jaguar xj8!
a 1998 Jaguar XJ8 weighs in at 4,044lbs.
different crash standards came into play in '98/99 hence the increase in weight. as well as the better trans and more airbags.
and the "all aluminum" XJ8 you speak of is a NEWER CAR, and cars have been getting HEAVIER as crash standards get more stringent. why do you think the Bugatti Veyron 16.4 weighs 4,486lbs and gets to 252mph, but the 10 year older Mclaren F1 weighed in at 2,513lbs and hit 240mph (unlimited).
gotta compare apples to apples, the LS was light in comparison to other vehicles in its class when it was built, but it is overall a heavy heavy car especiallly when compared to an SC that can get stripped down to ~2800-3000lbs without an interior and all metal body parts.
08-23-09, 11:25 AM
#23
Lexus Champion
Well, at somewhere around 100k miles they all seem to become LSD.
https://www.clublexus.com/forums/ls4...eel-out-2.html
https://www.clublexus.com/forums/4738111-post23.html
https://www.clublexus.com/forums/4742634-post25.html
https://www.clublexus.com/forums/ls4...eel-out-2.html
https://www.clublexus.com/forums/4738111-post23.html
https://www.clublexus.com/forums/4742634-post25.html
08-23-09, 11:34 AM
#24
Lexus Champion
Thanks, in fact I cannot remember seeing ANY GS400/430s posting a faster "stock" time. I say stock because I added nothing... but I did detract... no rear mufflers saved 20+lbs, empty trunk, 1/4 tank gas, no "junk" in the car, modifed stock air filter box.
This morning I was looking at the Edelbrock 2.3 TVS supercharger system for the Mustang and that got me thinking...
08-23-09, 05:22 PM
#25
Well, at somewhere around 100k miles they all seem to become LSD.
https://www.clublexus.com/forums/ls4...eel-out-2.html
https://www.clublexus.com/forums/4738111-post23.html
https://www.clublexus.com/forums/4742634-post25.html
https://www.clublexus.com/forums/ls4...eel-out-2.html
https://www.clublexus.com/forums/4738111-post23.html
https://www.clublexus.com/forums/4742634-post25.html
I guess Ive been out of the LS400 forum awhile. I wonder if this is the case with the LS430?
08-23-09, 09:41 PM
#26
Lexus Champion
Best way to find out is do a brake stand and check to see if both tires spin or not.
How many miles on the 430?
Keep in mind that this "free" LSD is not as effective as a engineered LSD. It will only spin both tires if going straight or at least start the spinning while going straight. This may be the reason for the frequent diff fluid changes spec'd by the factory.
11-15-10, 06:55 AM
#27
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went to the drag strip and netted a 15.4 @ 92 mph with a 2.2 60 ft If i had more than 1 run i may have been able to improve that 60 ft a little and widdle it down to a 15 flat.
car is a 1990 has exhaust and intake and a newr JDM motor . i believe she is doing better than stock times when she was new and that's all i was trying to measure.
car is a 1990 has exhaust and intake and a newr JDM motor . i believe she is doing better than stock times when she was new and that's all i was trying to measure.
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