Current best two laps, both 2:03's

Previous best laps...here is 3 between 2:06.17-2:06.45...no shift O matic..ride height was 105-140

 

Your heel & toe looks & sounds good. You've fully made the transition from an autobox.

What kind of corner speeds are you seeing on the data? And what data logger are you using? I have some data from 9 years ago. Black lines are 2:10 on Michelin PS and red lines are 2:06 on MPSC:



You mentioned loosening up your car. You might like this vid:

 

D, as we talked about many times, classic too much rear shock, springs, or LSD. it can only get better now!

 

You cant compare those two days! you are driving Totally and completely differnet. even not even downshifting into the "hill" turn 5. lally gagging braking approaches, very very different.

interesting the trade offs of a 2.2 vs 2.54. you only use two gears on any given straight - turn sequences. but you are optimized better down some of the straights hitting near redline it sounds. again, nice job

 

Dennis
I use "Harry's lap timer"......only $20 and works on Iphone.....I can send the file to you.....I think it can upload data to a couple different formats.....

My best lap is about like this

T1 looks like I drop to about 85
T2 I think my data is wrong....its saying 55 which is far too slow.
T5 is low around 45
T6 looks like turn in at about 60
T8 hits just over 100mph, but I lifted so it drops to around 92
T9 is 70
T11 is about 40
105mph back straight
T14 40mph
117mph main straight

I'm working on putting my data overlayed on your pic....should be interesting

 

MK
I really like the gearing....I am hitting almost 6000rpm in 4th at my braking point past start-finish....my GPS and rpm-gearing are quite close....only a few mph different (tire slip)

 

Brian
I think driving the track over and over in 4th gear made you a much better driver. Esentially the same thing as driving a low Hp momentum car. no accelreration but time to concentrate on maintaining speed in the corners.

Good job buddy! I don't care what Jeff or Kibort say.
Sean

 

Hey..im in agreement.

Smooth weight control = fast.

 

with out question, you are hitting higher rpm ranges at the end of the straights, and im wondering if those turn entries can be done with a lower gear. might be in no mans land. if so, then you are stuck with the trade off of optimized straight away RPM, but bogging out of some turns. the truth will be told when you run against Scot (on the same tires) to see where the advantages are. obviously, as i have always said, its about optimizing HP. (HP-seconds). if you can do that by max rpm in the straight, and there is less time in the slower sections, you will have an advantage. there are a lot of trade offs at thunderhill, and actually disadvantages for the 2.54 at laguna vs the 2.2. however, based on the video, i would think that the 2.54 is pretty optimal at thunderhill. you might want to try shifting down at turn 2, 4, 5, 9, 10 and 13. i did what you are doing at sears point with the new stroker, thinking i could be as fast by just bogging and keeping the R's down, until i then realized my times actually went up, i went back to ""drive the car hard" mode and the times dropped significantly.

You are smooth, and that is good. dont confuse smooth with having to keep the car in a lower gear. thats beginner talk. sometimes, and only sometimes, the lower gear might be in the wrong place of a turn, , exit, etc and you may not have the grip, so then, yes, it is optimal to be in a taller gear. this is VERY rare. laguna corkscew comes to mind, until i was skilled enough to WOT out the exit of the corkscrew in 2nd. took a long time to get the confidence to do that. i had to , becuase other competitors were!

 

Yes, he is doing a good job. i he wants to RACE, he needs to do both! drive like he is in a momentium car, but also keep max power to the wheels when ever possible. thats what willl make him really good, and he might even be able to be there now. he should be using these races to do these comparisons. not just compare laps from months earlier and think that the set up was an improvement. He , as a driver is making most of the changes . its what quality seat time does!

 

I am gonna have to try 2nd gear in 11 eventually....I just think the slight boost you get, but are forced to short shift or else be shifting at apex of 12 isn't worth it....I also wonder how effectively I can put power down in 2nd...I am a bit worried about wheelspin with my brute 243whp....

I could take 2-3-4 in 3rd, currently 4th....but a LARGE part of why I don't is oil pressure drops (here we go)....I am coming off T2 at 75+ at over 1.4G at my pressures are around 3bar....this is at about 3750rpm... so lets say my engine is sucking 11GPM and still dropping pressure.....at 5000rpm in 3rd I could accelerate much harder, BUT it would be above 15gpm of oil....while I can live with 3 bar at 3800 3bar or less at 5k I do want to try.......I really need to but a 3/8th spacer on this engine!!!!

 

watch my video of thunderhill, with 100 more hp and watch the gears and acceleratoin the chassis can withstand. it can do a lot more than you are giving it credit for. you are certainly taking advantage of the additional slick grip, now use more of the power and you will benefit. there are e30s on slicks with 240hp running 2:01s.

 

go do the math, but Im not that far off what you are taking about here. I dont think the 2.54 has the same gear ratios, they are adjusted so that the difference is not a 2.2 vs 2.54 ratio differnce. (in 5th it is, but we dont use that gear). so, if i can handle it and have handled it in all sorts of 928s, yours can do it. just make sure your oil is full and has amsoil. however, to your point, it might not be worth it in turn 2, were there is not much acceleration needed, just up the approach to the hill, not so muchdown the hill, but certainly out of 9 and 10 and the final turn complex. this i do know.

that slight boost you talk about , could be a car lenght in turn 11. dont underestimate it. shifting , if done right , will not upset the car, but only in a few circumstances. im sure you can redliine the car, at the exit of 11 and 12 by running it out to the exit birm. again, our gear boxes are not that far off, and im in the 1:58high range for time. (a full 5 seconds faster! ) go look at the specs for the 2.2 3rd and 4th and compare it ot the 2.54. i bet its only about 5-8% diff)

 

MK
I have a G28-03 so its not the 2.54 its the 2.75.....my actual ratios are like this:

1st 3.601 2nd 2.466 3rd 1.819 4th 1.343 5th 1.00

So my speeds are about 67mph in 2nd.....and 92mph in 3rd (at 6k)...so coming off a 40mph corner like 11 I would be at 3600rpm in 2nd or 2700 in 3rd....so that gives me effective wheel torque of

2nd 3600rpm =245ftlbs x 6.7826 = 1661.7 ftlbs
3rd 2700rpm = 230ftlbs x 5.0035 = 1150.8 ftlbs

So by using 2nd I can gain 44% more acceleration in theory.....i will have to try it on Friday....plus its more heel-toe practice for me as well...

 

There you go! as driver, you need to harness this power, not just try and be smooth! you are smooth now, and Im sure you can handle it especially with the slicks.

sure, some of those turns like 2 and 3, you might not be able to use it, and also you dont want to be reeling around turn 2 at 6000rpm due to oiling issues, but , i dont think you are that far off what i run as far as RPM around the turns. we did the math before, and it was around 10% difference at most

just by watching the video, there is a little time to be gained by being in some lower gears.