getting ready for track

[Shimy87]

Talke to Husek and he said not to lock converter with a switch. I have to check my logs at home but I think the car was shifting and going thru the lights at about 5200 rpm...shouldnt it be closer to 5400 on the shifts and at the line?

[Steve Wood]

Looking at Sunday's log, it shifted to second at 5280, to third at 5200, and you let off at 5066 when you hit the line.

Another couple of hundred rpm would not have hurt.  I was always too slow to manually shift out of first.  Floated the valves a few times.

I am not sure what effect will happen if you get it leaned down other than faster acceleration in first and second.  It will probably still try to shift at the same rpm but you may gain some rpm in third at the line.

I don't recall what cam you have in the car if you changed it.  The stock cam was pretty much over with by 5200-5400 rpm as I recall.  You could trim the governor a tiny amount and bump it up a little.

You might calculate the speed it should have been going when you crossed the line and compare that to what it was actually indicating to see how much slip it was incurring and ask the guy if that is what he expects.

[Shimy87]

its got a 206/206 cam. I'll have to figure out the slip thing

The calculators I find say about 2% slip???

[Steve Wood]

Okay, for the 206 cam, I am guessing you should be shifting about 5600 rpm.

2% does not sound anywhere close to being correct.  The powerlogger mph needs to be corrected for tire size.  It is reporting what the speed would be if it was a 26" tire and I think you have a taller tire.  I don't recall what tire you are running but I would guess the actual speed is closer to 8% faster than being reported on PL

[Shimy87]

2% is probably wrong  I used the 110 MPH on the time slip, 5066 at the line, 27.8 tire height, stock 3.42 rear and 4th gear is 67:1 ( I think)

[Steve Wood]

You were in third gear I think at the line so you should use 1.0 as the gear ratio.

Anyway, kicking the shift points up should make it quicker, I think

I suspect it will still be accelerating at 5700 rpm for that matter.

[reality]

RPM Calculator
Gear Ratio :   
3.42
Trans Gear:   
1.00
Tire Diameter:   
27.8
 Inches
MPH:   
111
 MPH
Converter Slip:   
9
 %
Input DATA Please

Your RPM is 5,003.09 RPM
 according to wallace

[reality]

If you use 0.67 for trans ratio it's 3400 rpm

[Steve Wood]

So, with 9%, we know the converter is doing its job.

It appears to me that we have to get further up on the cam in first and second so the car can run on up in third before the line.

So as said previously, get the timing up in low, see how that affects the fueling.  If necessary, pull more fuel out of first so it will rev faster, shift at 5600 or 5700 from first to second and second to third.  Hope that allows to cross the line at 5400 or better.

I think 26 or 27 psi should not be a problem with boost either.  but first, I would work to see how the higher shift points work.  They might actually drop the boost??

[Steve Wood]

Btw, did you install the new ic?

[ULYCYC]

Not sure if your 206/206 cam is flat tappet or roller but that grind's power curve ends around 48000/5000rpm's. The roller may be 5200 rpm's.
Check your cam card or look up the brand and model #.  After the power curve the hp level drops pretty fast so make all your tweeks before you get to that point.

[Shimy87]

Yes. New IC
Flat tappet cam

After a long talk with Husek, the converter guy, he said the same thing. get some timing in first to get it to rev, he also suggested 26-27 lbs on boost. Said to really watch the fueling when messing with timing

I'm at a weird crossroads with the car. I love the racing/tuning stuff. I also love the car and not being boastful but its like new inside and the paint/body are perfect also. I'm the OCD car guy that is constantly polishing and cleaning..... Racing it is nerve racking but my goal was an 11 second car. I know thats not that impressive but that was my original goal and I have made it....barley but its there. In my head, I know I'm never getting in the 10's, so whats the point of pushing the car just to get to mid, maybe low 11's?? Is the risk of tearing up the car for a few more tenths worth it?

Dont know what I'm going to do, just talking to you guys for some feedback. I love the racing and I have a 2011 Camero thats not that fast but also fun to race and I have no "concerns" when I run that one.

[ULYCYC]

looks like your numbers are pretty good. I wouldn't worry about getting higher rpm's with that cam. Get your 60ft time in the 1.5's and add a little more boost and timing as Steve mentioned and you should hit 11.40's

[Steve Wood]

here is what TA says about their 206 cam.  

VALVE LIFT 

• STOCK 1.55 RATIO:
   IN: .434”
   EXH: .434”
• TA ROLLERS 1.60 RATIO:
   IN: .440”
   EXH: .440”

DURATION

• AT .050
   IN: 206
   EXH: 206
• ADVERTISED
   IN: 260
   EXH: 260

• LOBE CENTER: 112
• POWER RANGE: 1500-5500

[Tim Hensley]

You have done a good job if that’s your first time for you GN to go to the track.
What turbo is on it? I’m green with envy with your 60 foot time and it being rich.