Great on all. I am running out the door. Spare tire/jack/wheels/tires/no more than 7 gallons of gas ever/diet.

I am glad you are having fun. Be careful.

 

Great on all. I am running out the door. Spare tire/jack/wheels/tires/no more than 7 gallons of gas ever/diet.

I am glad you are having fun. Be careful. Every little bit helps. Filter plus this, that, and the other, and you have something.

 

Glad to see you are underway with testing.It looks like your losing some time at the start(0-10)and also maybe on your shift to 2nd.I can't help you much with getting off the line as both I & Znod have steps.Try experimenting with different rpm launchs and with easing the gas peddle down.Don't get discouraged I know from many years drag racing experience it is much more difficult to get good starts with standard shift.What is your rpm's on the 1 to 2 shift?If your running into redline you may be losing some power.Try shifting at 6000 rpm to see if it does anything to your times.On the start you need to get your 60' times down to 2.00 or under.

 

RPM was in the 1,000 - 1,500 range. Had not though about the RPM at the shift to 2nd. Will try to experiment today. Agree about the 60' time. With a rollout of 12', does this mean that you could get wheel spin and not move 12' and timing would not start? If so, I might be need to have a higher launch RPM and a little more wheel spin!

Thanks again,

 

I am just throwing in my 2 pennies. I am sure that grogan will respond also soon. Maybe he is out testing his car? I hope.

Experimenting with shift points is good. You can also calculate your optimal shift points. From the calculations I have made, I am betting that redline is optimal on a manual also. If you want to do some calculations, the check out Lawlor's Auto Math Handbook. I have posted a torque curve, on the thread mentioned below, with some important RPM data, for a Step, converted to ft. lbs. Still, it should help you; you can draw your own lines.

Edit: I misunderstood what you said initially. Right, as ECF confirms below, you could sit and spin with timing not starting, in principle until your reach the 12" point. But, excessively violent launches may give bad readings on g-meters, I think.

If wheel spin is your problem, then you probably don't want more. It is possible that your wheel spin is such that you would be better off with less or more--probably less for time reasons and others as well. I would try for the smallest amount possible, at this point, and see if your data improve. That's how I try to accelerate on the street in my Z06. Check out the Z06 posting that I made in my performance woes from 20.01.00 thread. You can then add wheel spin back.

I really don't think that drag-strip magnitude wheel spin on the street is a great idea for a number of reasons. But, grogan would have better insights on such matters than me.

 

I believe that is the case. According to the manual, the unit simulates conditions at a drag strip where the clock doesn't start until the front wheel rolls pass the sensor which triggers the clock.

Oh, and to clarify, it's 12 inches not 12 feet.

 

OMG, I've been using 12.' No wonder my times seemed so good.

 

Thanks ECF - "inches" is what I ment, not 'feet'

 

I'm sure we all knew we were talking about inches. I just didn't want someone to jump in mid-thread and assume something else.

 

I agree with Znod less wheelspin is better.Many years ago some wheelspin was considered necessary for good times at the drag strip.Now "no" wheelspin is considered the best start.I am sure your 60' times are due to too much wheelspin.I suggested shifting at about 6000 rpm for you because with the standard transmission you could get into the rev limiter which will reduce power.Znod and I have steps which will shift at 6500 regardless of our inputs.Really can't over rev with a step.