1st time to track (Correction Drag Strip)

[XH29N0G]

Love stick cars. Practice gets the shifting down. Before you know it you wont lift at all and you wont even be able to hear the rpm increase during shifts.

Just a little scared about the not lifting thing.  Probably should be more scared about the launch. 

The only car I have speed shifted on was a 1980 diesel rabbit and that reved pretty slowly 

Will the limiter on the MSD 6AL keep it safe?

Hoping the weather is nice this weekend to try again.

[GOTWING]

Love stick cars. Practice gets the shifting down. Before you know it you wont lift at all and you wont even be able to hear the rpm increase during shifts.

Just a little scared about the not lifting thing.  Probably should be more scared about the launch. 

The only car I have speed shifted on was a 1980 diesel rabbit and that reved pretty slowly 

Will the limiter on the MSD 6AL keep it safe?


I feel your pain, my dad had a 1980 dasher diesel omg it was dangerously slow ! I would use it when I ran out of gas money as a teen. ( I drove my charger normally ) I remember going up a bridge I would turn off the ac to give it a little extra boost in power.

Hoping the weather is nice this weekend to try again.

[taxspeaker]

Excellent-glad to see the results!

[XH29N0G]

Made it back today.  The first run was better (13.2 104 and change).  I missed the 2-3 shift on the second run and it was slightly worse (13.9, 99).  I also had a chance to glance at my A/F gauge at the end and it read 14.0  I decided to stop.  Check more on the A/F, but definitely plan to return.  The 1st pic shows the cars around me in the line up (somehow I ended up in a group of dodges).  The second one is of the first time slip.   I was caught off guard by the tree, and shifted earlier 4800-5000.  There also was about a 10 mph headwind.  
 

[cdr]

awesome!!!!

[BSB67]

 

What carb? what A/F when cruising?  Might be as simple as upping the secondary jets.

[XH29N0G]

BSB67,

Thanks,  I also was thinking about upping the secondary jets.  

The carb is a Quick fuel Q-850 with annular boosters.  

My notes say the jets are 69/primary, 78 secondary, high speed bleeds are 31 & power valve is 10.5

I set it up this way on 2nd and 3rd runs.  Looking at them in total, I had it running mid 13's for a/f and wonder if when it finally ran up in 4th where there is more time on the main circuit that it went a touch leaner (I think it was also higher RPM).  

My A/F when cruising is currently high 14's and low 15's (the OD (5th) has cruise near 2000 RPM).  

[c00nhunterjoe]

Msd will prevent an overrev depending on what pill you put in it. 1.7 60' is respectable on those tires behind a stick car. Af could be as simple as jetting, but also what fuel pump are you running?

[XH29N0G]

Thanks for the idea.

I am running a carter M6903.  I replaced the fuel pump pushrod and fuel pump this last spring (the previous pushrod wore down).  The car has 3/8 inch fuel lines.  

Unfortunately, I do not have a pressure gauge currently installed to check fuel pressure during the run.  

I think Jets are probably the most logical place to make a change.  Looking back through my notes when I was selecting the jetting using 2nd and 3rd gear WOT bursts is that the A/F wasn't that far from where it ended up in 4th on the last run.  (It was settling in to a/f (on the gauge) of 13.2 to 13.7 in 3rd.)

[BSB67]

Thanks for the idea.

I am running a carter M6903.  I replaced the fuel pump pushrod and fuel pump this last spring (the previous pushrod wore down).  The car has 3/8 inch fuel lines.  

Unfortunately, I do not have a pressure gauge currently installed to check fuel pressure during the run.  

I think Jets are probably the most logical place to make a change.  Looking back through my notes when I was selecting the jetting using 2nd and 3rd gear WOT bursts is that the A/F wasn't that far from where it ended up in 4th on the last run.  (It was settling in to a/f (on the gauge) of 13.2 to 13.7 in 3rd.)

Use the gauge for info, and to not melt down your motor.  DON'T use it to decide what is right for WOT.  Use actual track data for that.  There is a good chance that what the internet computer jockeys tell you verses what your car needs for max power might be two different things.

[c00nhunterjoe]

   ive seen jet changes pick up 2 mph at the track on back to back runs when the computers say everything is perfect.

[XH29N0G]

Use the gauge for info, and to not melt down your motor.  DON'T use it to decide what is right for WOT.  Use actual track data for that.  There is a good chance that what the internet computer jockeys tell you verses what your car needs for max power might be two different things.

This is nicely worded and a good point.  

I will see if upping the jets make a difference, but will only go larger because the A/F is telling me I am already getting a little close to lean territory. 

At my stage, other variables (like my ability to launch and shift) are likely an even bigger issue for time and speed.

[BSB67]

Yes. Tuning can really only begin with any real meaning after you get the car reasonably consistent.

Right, not leaner.