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Originally Posted by Divexxtreme
(Post 1811364)
I would like Jean to go out and get some 1/4 mile times with his car as well, but in all honesty...his 60-130 times are very quick.
As you know my car is setup for the race track. I have very stiff suspension, it is very low, very aggressive alignment settings, 2WD, no LSD, huge tires (275 up front on occasions).. all of the above are the worse combo for the strip. The only attempt I had at the 60-130mph 2 years ago ended nearly with an accident, I had a two lane change without even time to react as the car went sideways. I checked my datalogs at home and they showed a 0.3 lateral G at around 95mph, I had to lift briefly. The car was all over the place going left and right. You can see on the datalogs what I mean, the red line is the sideways motion, (the lateral Gs not long Gs). If you compare this to other runs that you have from yourself or others, you will see how bad this is. :cool: http://forums.rennlist.com/upload/60...jean_copy1.jpg My engine was built for the race track in mind in 120F temps, so it is tuned for low boost and the injectors maxxed out at around 1.2 bar, I have never run it at that boost yet, I ran it at 0.9 bar on the track, and this is how it lasted 2 years of club racing (all of this can be cross checked with Todd). This sideways run was at less than 1.2 bar with fuel worse than California, in 100F temps. I like reading and debating about 60-130mph but it is definitely not something I go out and try or where I try to compete, hence I only did one serious attempt, ever, and that was it for me! I am scared of speed ;) |
Originally Posted by Divexxtreme
(Post 1812540)
It totally depends on the car. With my car, my boost is already hitting hard in 3rd before I reach 60...but since I'm not at the top of my rpm range (8k rpm), I'm not making my maximum power. Thus, it benefits me to lose a little time by shfiting twice rather than once, in order to stay in the peak of my RPM range as much as possible throughout the run.
If you have a lower redline and your car's HP peak is near the high end, than you may be at max power closer to 60 in 3rd than I am...which means you may be better off with one shift. My only point about lag was that unless we're talking cars that don't build boost until after 60 mph in 3rd (neither my car, nor your car falls into this category), than it isn't really an issue. It comes down to where in the powerband your car is making its peak power....and how close you are to that point when you are in 3rd gear at 60 mph. Of course the speed that you shift helps as well. Not only for the obvious reason (reducing the time that you aren't accelerating), but it also may prevent a large drop in RPM and get you back into boost sooner. This is primarily why turbo cars with autos are so fast in runs 1/4 mile and 60-130 runs. They never drop out of boost during the run. Jean I feel you man as well. My car is setup strictly for the track, although I am very curious about it's performance in a 1/4 mile, it's just useless to me and for what I use the car for. |
Jean, is the car very trackable with the RWD and no LSD.
My only time trying it was with the PSM on, and now that I know how PSM upsets my car, maybe it felt worse than it would have off. |
Originally Posted by heavychevy
(Post 1813046)
Jean, is the car very trackable with the RWD and no LSD.
My only time trying it was with the PSM on, and now that I know how PSM upsets my car, maybe it felt worse than it would have off. Let's say it is not something I recommend. I like having fun at the track, and part of that is going sideways out of turns :) When I say no LSD, it means none at all, so if you have the stock LSD, you should be fine. It is drivable definitely, you need to be very smooth with the throttle though. During racing, I would guess I might gain another second with LSD. There are so many other things that we need to improve before blaming hardware, that I am stretching it to the limit. Still on stock 993TT brakes as well , just pads and SRF :) |
Oh man, I forgot you are 993 and have stock LSD. 996 TT does not have the privelege.
I've done it before and I'm pretty sure I can handle it, but I dont want to fight the car the whole time. I've aborted my plans for RWD. |
Originally Posted by Jean
(Post 1813037)
Scott
As you know my car is setup for the race track. I have very stiff suspension, it is very low, very aggressive alignment settings, 2WD, no LSD, huge tires (275 up front on occasions).. all of the above are the worse combo for the strip. If you slap on a set of quality drag radials and make no other changes to your car...you'll hook plenty well enough to get a decent 1/4 mile E.T and trap speed. No worries there. If I was looking for a 9 second 1/4 mile E.T., I'd change my whole setup...but I really only care about trap speed in my P-car. The only attempt I had at the 60-130mph 2 years ago ended nearly with an accident, I had a two lane change without even time to react as the car went sideways. I checked my datalogs at home and they showed a 0.3 lateral G at around 95mph, I had to lift briefly. The car was all over the place going left and right. You can see on the datalogs what I mean, the red line is the sideways motion, (the lateral Gs not long Gs). If you compare this to other runs that you have from yourself or others, you will see how bad this is. :cool: My engine was built for the race track in mind in 120F temps, so it is tuned for low boost and the injectors maxxed out at around 1.2 bar, I have never run it at that boost yet, I ran it at 0.9 bar on the track, and this is how it lasted 2 years of club racing (all of this can be cross checked with Todd). This sideways run was at less than 1.2 bar with fuel worse than California, in 100F temps. I like reading and debating about 60-130mph but it is definitely not something I go out and try or where I try to compete, hence I only did one serious attempt, ever, and that was it for me! I am scared of speed ;) |
Scott, that's quite impressive that you get those times! With softer suspension and some ride height in the rear, you should do much better still.
My guess would be that I would trap around 135mph+ at 1.2 bar, Acropora did a 133 or similar, I am lighter (3100 lbs + empty)and I think I have more power than his Proto 993Tt setup, but I don't have any 60-130 from him to compare. |
Hello Jean, I guess that what the forum should know is how good your car is on the track, as well as you drove it..Why you do not mention that you had the fastest stop lap ever made on street car in the Dubai Autodrome...:-) your car is just perfect...fun as you said..TC & See you soon
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Originally Posted by fgaillard
(Post 1814469)
Hello Jean, I guess that what the forum should know is how good your car is on the track, as well as you drove it..Why you do not mention that you had the fastest stop lap ever made on street car in the Dubai Autodrome...:-) your car is just perfect...fun as you said..TC & See you soon
This thread is about straightline acceleration, but yes I do have the track record and the last 4 overall victories in a row at the Porsche Club sprint races. :cool: I did clock a 60-130mph in 6.2s yesterday after I gave it a single try....at <1 BAR and pump gas! ;) |
Jean
Can you post a foto of your car? Sincerely Robert |
Fantastic job Ryan! Some credit should go to your impressive weight loss program. How many pounds have you removed?
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Originally Posted by roadsterdoc
(Post 1816295)
Fantastic job Ryan! Some credit should go to your impressive weight loss program. How many pounds have you removed?
Originally Posted by robmd99
(Post 1816193)
Jean
Originally Posted by robmd99
(Post 1816193)
Can you post a foto of your car?
Sincerely Robert http://forums.rennlist.com/rennforum...6&postcount=11 |
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Okay guys...so here's one hell of a run:
Tym Switzer ran dk996TT's 997TT to a extraordinarily quick 5.21 60-130 with 1-shift on a almost flat .40% decline! Tym also pulled a very quick 0.20 second 3rd to 4th shift. The run was completed in only 759 feet. With this phenomenal run, dk996tt just jumped to #3 on the list! Outstanding job!! |
Great run DK and Tym. It looks like it has more in her. Good Luck.
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Dayum, it runs as fast as it sounds! Awesome job DK and Tym!
And on stock internals :eek: |
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