Stock cam - shift points?

Thanks a lot for the replies. I need to dial down my shift a little bit. I usually prepare to shift around 5, and slam into gear at 5,500, so I'm probably shifting closer to 5,700 which is losing some time. I'll give these new ones a shot next time I hit up the strip.

final5-0 said:

As you can see by the replies above ...........
Most say to shift lower than you have been shifting

I would say that is good advice
but
If you got the stock tach

They are known to read a bit high

A sure fire way is to keep accurate records of your runs

You are keeping records now ... aren't you

Anyway

Just start shifting at something like 4800 and add a bit more rpm
to each pass and your time slips will tell you where the sweet
spot is gonna be

That way ... Even if your tach is a good bit off ... It won't matter

Grady

Click to expand...

Yessir, I've got every timeslip from every pass I've made, and the main thing I find from each one is that a driver mod is necessary! I'm still working on finding that sweet spot for the launch, and next time I go out I'll try your technique of starting at 4,800 and advancing until I reach the best time. Thanks man.

final5-0 said:

I like what you have said here

I confess it has been years since I slipped down the Ole 1320
but
I did make many many passes in many different cars

I was always amazed how it took a while to get all the simple things
like shift rpm launch, coolant temps, tire pressure, etc all dialed in
after you changed cars or made a major change

For sure ... stuff like that that can shave a good bit of time off the et

I used to write all that data in a spiral notebook

Yes ... like you said ... practice can be one of the best driver mods

Grady

Click to expand...

Perfect practice makes perfect! My first time at the strip, I launched at 4 grand like I would on a normal road, and instead of spinning slightly then hooking and going, my rear end went sliding down the strip at an angle all through first. I tried feathering the gas a bit, and all it wanted to do was spin. So far I'm finding around 3,200 to be my best launch rpm, with 15 psi in the tires. I also really need to work on shifting quicker. I was powershifting, but after grinding and missing too much, I'm going to work on just shifting much quicker than normal without having to powershift (AKA I'm too cheap to feel like replacing tranny parts ).

blksn955.o said:

As far as launching goes...

On street tires I found 24-28lbs (depending on conditions) and leaving at 2k rpm gave me the best 60ft. Avg. around 2.0-2.1 with a best of low 1.9. Really that is about as good as it gets on street radials. You do not get a big plus in lower air pres. in radial tires as the sidewall just does not have the sidewall give/wrinkle or compound to take advantage of the low PSI.

DR- I am still learning those myself not enough seat time....but I have had some very good tips/pointers just need to get good at implementing them.

Click to expand...

I've got street tires, but they're verrrrry soft compound. On the street I can dump it at 3500-4000 and it'll spin for a split second but hook and go after. I got a 2.0 60' leaving at around 2,800-3,000 at about 15 psi.