Fastest 1/4 mile time - SC400 only
#151
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Went to Darlington dragway in South Carolina last night. Conditions less than perfect. About 66 degrees and VERY humid. I could feel the moisture in the air. So I think the track was a bit wet not to mention the air density. LOL.
Anyway, best run -
RT - .121
60 - 1.872 (only half way descent 60 I got all night)
330 - 5.386
1/8 - 8.208 @ 87.26
1000 - 0.0 (not listed for some reason)
1/4 - 12.685 @ 110.67
This is very good considering the damp air and track. I had a can of octane boost that I forgot to put in. My runs steadily got worse after that run, crappy 60fts and lower mph's.
If I could have only managed to hit that 1.8 60ft again. Oh well. I still think I could run (very) high 11's with some good air and a good set of sticky tires.
I have some in car video I'm going to upload a bit later BTW.
KC
Anyway, best run -
RT - .121
60 - 1.872 (only half way descent 60 I got all night)
330 - 5.386
1/8 - 8.208 @ 87.26
1000 - 0.0 (not listed for some reason)
1/4 - 12.685 @ 110.67
This is very good considering the damp air and track. I had a can of octane boost that I forgot to put in. My runs steadily got worse after that run, crappy 60fts and lower mph's.
If I could have only managed to hit that 1.8 60ft again. Oh well. I still think I could run (very) high 11's with some good air and a good set of sticky tires.
I have some in car video I'm going to upload a bit later BTW.
KC
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I have new mods brewing as well that I hope can bring me around a nice time. I doubt I will get to the drag strip very often though.
#152
Lexus Test Driver
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Thanks everyone!
I am happy with the time...BUT, I know I can still do better. I know, I'm obsessed. The 1/8 time on that run is still two tenths slower than my best at the 1/8 track.
I hadn't mentioned this but my driver's side header collector gasket blew out on me. I think that was the main cause of my dropping et's and mph's that night. I was running very rich, even bogging down on the start. I fixed it, hopefully for the last time today.
So, as promised, here is an in car video. I didn't have anyone with me to take some outside vids, maybe next time. I'm about 90% sure this was the 12.68 run.
http://www.youtube.com/watch?v=9P3ee2N6tSs
Enjoy!
KC
I am happy with the time...BUT, I know I can still do better. I know, I'm obsessed. The 1/8 time on that run is still two tenths slower than my best at the 1/8 track.
I hadn't mentioned this but my driver's side header collector gasket blew out on me. I think that was the main cause of my dropping et's and mph's that night. I was running very rich, even bogging down on the start. I fixed it, hopefully for the last time today.
So, as promised, here is an in car video. I didn't have anyone with me to take some outside vids, maybe next time. I'm about 90% sure this was the 12.68 run.
http://www.youtube.com/watch?v=9P3ee2N6tSs
Enjoy!
KC
#153
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Thanks everyone!
I am happy with the time...BUT, I know I can still do better. I know, I'm obsessed. The 1/8 time on that run is still two tenths slower than my best at the 1/8 track.
I hadn't mentioned this but my driver's side header collector gasket blew out on me. I think that was the main cause of my dropping et's and mph's that night. I was running very rich, even bogging down on the start. I fixed it, hopefully for the last time today.
So, as promised, here is an in car video. I didn't have anyone with me to take some outside vids, maybe next time. I'm about 90% sure this was the 12.68 run.
http://www.youtube.com/watch?v=9P3ee2N6tSs
Enjoy!
KC
I am happy with the time...BUT, I know I can still do better. I know, I'm obsessed. The 1/8 time on that run is still two tenths slower than my best at the 1/8 track.
I hadn't mentioned this but my driver's side header collector gasket blew out on me. I think that was the main cause of my dropping et's and mph's that night. I was running very rich, even bogging down on the start. I fixed it, hopefully for the last time today.
So, as promised, here is an in car video. I didn't have anyone with me to take some outside vids, maybe next time. I'm about 90% sure this was the 12.68 run.
http://www.youtube.com/watch?v=9P3ee2N6tSs
Enjoy!
KC
#155
Lexus Champion
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Went to Darlington dragway in South Carolina last night. Conditions less than perfect. About 66 degrees and VERY humid. I could feel the moisture in the air. So I think the track was a bit wet not to mention the air density. LOL.
Anyway, best run -
RT - .121
60 - 1.872 (only half way descent 60 I got all night)
330 - 5.386
1/8 - 8.208 @ 87.26
1000 - 0.0 (not listed for some reason)
1/4 - 12.685 @ 110.67
This is very good considering the damp air and track. I had a can of octane boost that I forgot to put in. My runs steadily got worse after that run, crappy 60fts and lower mph's.
If I could have only managed to hit that 1.8 60ft again. Oh well. I still think I could run (very) high 11's with some good air and a good set of sticky tires.
I have some in car video I'm going to upload a bit later BTW.
KC
Anyway, best run -
RT - .121
60 - 1.872 (only half way descent 60 I got all night)
330 - 5.386
1/8 - 8.208 @ 87.26
1000 - 0.0 (not listed for some reason)
1/4 - 12.685 @ 110.67
This is very good considering the damp air and track. I had a can of octane boost that I forgot to put in. My runs steadily got worse after that run, crappy 60fts and lower mph's.
If I could have only managed to hit that 1.8 60ft again. Oh well. I still think I could run (very) high 11's with some good air and a good set of sticky tires.
I have some in car video I'm going to upload a bit later BTW.
KC
Couple of questions.
1. Will the piggyback ecu your running let you change the factory set rev limiter rpm point ? If so you could move it up let say 500rpm's. Not change the factory transmission shift points, and then the trans would have a chance to shift without the rev limiter kicking in.
I know you are well ahead of thinking on this one, i'm just curious about what your thoughts are. If you put in those cams how were you gonna move the limiter up ? I am partial to Unichip Piggybacdk ECU and I think it can do it. I am also impressed with the MAFTpro and talked to them at length a couple of years ago. Gussing the MAFTpro can do it to.
BTW - I've got a 430 VVTI 3UZ being built, and stroked right now thats going in my new 99SC4, with a large Direct Port NO2 progressive shot kit. Darlington will be my main test track. I love/hate that track. If you can run fast there, you can run faster anywhere else.
If not for, the revlimit hit and, damp air and track. I know you had a potential 11.xx run. You'll be .20 to .30 sec faster at any other track. Great work !
#156
Lexus Test Driver
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Originally Posted by Punky
Is it just me or did you hit rev limiter on 1st gear? What transmission mods do you have also?
Originally Posted by jgscott
Great Run. That motor sounds Mean ! That setup just keeps working better and better.
Originally Posted by jgscott
Will the piggyback ecu your running let you change the factory set rev limiter rpm point ? If so you could move it up let say 500rpm's. Not change the factory transmission shift points, and then the trans would have a chance to shift without the rev limiter kicking in.
I know you are well ahead of thinking on this one, i'm just curious about what your thoughts are. If you put in those cams how were you gonna move the limiter up ? I am partial to Unichip Piggybacdk ECU and I think it can do it. I am also impressed with the MAFTpro and talked to them at length a couple of years ago. Gussing the MAFTpro can do it to.
I know you are well ahead of thinking on this one, i'm just curious about what your thoughts are. If you put in those cams how were you gonna move the limiter up ? I am partial to Unichip Piggybacdk ECU and I think it can do it. I am also impressed with the MAFTpro and talked to them at length a couple of years ago. Gussing the MAFTpro can do it to.
Also, the ECU uses the signal from the no 2 speed sensor to determine when to shift, not RPM. Might be possible to use a signal modifier to make the ECU think the car is going a little faster than it really is.
I think that the rev limit problem can only be fixed by either installing a real shift kit (modified VB), TCU or by raising the rev limit (or the speed sensor idea). With this newer trans, I really think it just takes too long for the trans to shift. It does not feel like anything is slipping. It bounces once or twice and then second hits rather hard.
My biggest problem now? I can't afford a shift kit, TCU, cams, slicks, NOS, ect. Sigh.
Originally Posted by jgscott
BTW - I've got a 430 VVTI 3UZ being built, and stroked right now thats going in my new 99SC4, with a large Direct Port NO2 progressive shot kit. Darlington will be my main test track. I love/hate that track. If you can run fast there, you can run faster anywhere else.
BTW, time slip scans. Three best runs. Then my collector gasket blew and I slowed down quite a bit due to very rich AFR's. Was bogging off the line.
KC
#157
Lexus Champion
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Yes it is, but I assure you, it is better than it was with the original trans. The transmission is my second one. It's a 96 trans with shimmed accumulators, disabled no 4 solenoid, and raised line pressure.
Thanks. I have definately made some progress. I still can remember running high 9's in the 1/8.
I don't think I can raise the limiter with the MAFTPro, but that is something definately worth looking into.
Also, the ECU uses the signal from the no 2 speed sensor to determine when to shift, not RPM. Might be possible to use a signal modifier to make the ECU think the car is going a little faster than it really is.
I think that the rev limit problem can only be fixed by either installing a real shift kit (modified VB), TCU or by raising the rev limit (or the speed sensor idea). With this newer trans, I really think it just takes too long for the trans to shift. It does not feel like anything is slipping. It bounces once or twice and then second hits rather hard.
My biggest problem now? I can't afford a shift kit, TCU, cams, slicks, NOS, ect. Sigh.
KC
Thanks. I have definately made some progress. I still can remember running high 9's in the 1/8.
I don't think I can raise the limiter with the MAFTPro, but that is something definately worth looking into.
Also, the ECU uses the signal from the no 2 speed sensor to determine when to shift, not RPM. Might be possible to use a signal modifier to make the ECU think the car is going a little faster than it really is.
I think that the rev limit problem can only be fixed by either installing a real shift kit (modified VB), TCU or by raising the rev limit (or the speed sensor idea). With this newer trans, I really think it just takes too long for the trans to shift. It does not feel like anything is slipping. It bounces once or twice and then second hits rather hard.
My biggest problem now? I can't afford a shift kit, TCU, cams, slicks, NOS, ect. Sigh.
KC
I think I remember Unichip telling me they just would have to find that line in the stock ecu, to change the revlimiter. I'm pertty sure MAFTpro can do it.
Did'nt you play around with the throttle position sensor after you put in the new tranny ? Did you set it back to the original position ? Could it be that's why it's taken longer to shift.
#158
Lexus Test Driver
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Originally Posted by jgscott
Ok I did kinda say 2 different things but..... My main thought/point was if you can raise the revlimter then the Trans shift points are still gonna be the same. The trans should stiill shift at its points or higher even if its taking longer, but.... it won't hit the Rev limiter and kill the engine revs.
Originally Posted by jgscott
I think I remember Unichip telling me they just would have to find that line in the stock ecu, to change the revlimiter. I'm pertty sure MAFTpro can do it.
Originally Posted by jgscott
Did'nt you play around with the throttle position sensor after you put in the new tranny ? Did you set it back to the original position ? Could it be that's why it's taken longer to shift.
KC
#164
Lexus Test Driver
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#165
Lexus Test Driver
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Originally Posted by stevechumo
KC, Do you have the LSD installed? With the new wider rear tires that I have, I notice the passenger rear tire tries to grip the ground more than the driver side. The symptom is it rubs the fender when under boost.
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So, I am the proud new owner of a set of Hoosier Quicktime pro's. They are 26 x 9.5 x 15. The only bad thing......the guy was advertising them with wheels, which were supposed to have a 4.5 x 5 bolt pattern. Well he was mistaken, they are 4.75 x 5. So, I'm on a hunt for some wheels.
Also, it has been a while since I've had any real driveability issues, but I have one now. For some reason, I'm going lean right at the point where I go from vac to boost (95-100 kpa or so), mid load. I think for some reason, the ECU is staying in closed loop longer than it was before. I think I'm actually going very rich and then the ECU is leaning me out and over compenstaing. I'm fairly sure it's just a tuning issue that I'll figure out. It's fine under WOT / full boost, fine under light throttle, just a little funky with mid throttle / load.
KC