shifting was a little better than last time I think. It was also a lot cooler, I don’t know how much that matters.

 

cold dense air will always be more power, car still needs either more gear or less cam

 

this winter gonna put some ported 243s on . Car is VERY sluggish off the line. Feels like it doesn’t make any power until 4k rpm. Hoping getting rid of the stock heads will help. I’m definitely regretting my cam decision. Should’ve went smaller

 

Whats the specs on the cam in the car right now ?

 

Specs: 231/244 .630"/.615" 112.5+2.5

 

Im go say you unhappiness comes from the big split between the intake/exhaust duration. A smaller split would be quicker... something like a 230/232

 

Idk....could be tuning. But one thing fo sho....you put a big cam in and don't add compression you did it wrong and will lose power at lower rpm.

Mill the eff' out of the heads and open up the exhaust port all you can.

Then thank me later.

 

It's a big cam would pair with more gear.

 

Realistically it needs lots of ****. Great example of why just shoving a big cam in something doesn't work tho.

 

yep, lesson learned.

 

if you plan on 243 heads i would cut them and run an .040" headgasket to get around 11:1 compression, there are compression calculators online to help you figure it all out, the added compression will make the cam work better but youll still want to regear at some point

 

So, lower the tire pressures on the rear tires a bit and launch it softer to lessen/eliminate wheel spin. Get it moving before you hammer on the throttle. Slip the clutch a bit to give a softer hit, don't use the clutch as an on/off switch in first gear.

 

If your clutch can handle it I'd run sticky tires.

 

My recommendations...

Step 1- add more rear gear.
...With current 3.42, clutch needs to slip well over a second and a half during launch to keep the engine up where it wants to be.
...With 4.10's, clutch only needs to slip around 0.95sec to keep the engine above 4500, gives you 1.45sec 60' potential.

Step 2- add clutch hit controller.
...Really helps with consistency, and you will be able to launch with more rpm without spinning or breaking parts.
...Higher launch and controlled clutch slip help keep the engine up where it makes more HP.

Step 3- raise launch rpm.
...425ftlb is only 258hp at most if the clutch draws the engine down to 3000rpm during launch.
...Raise launch to around 6500, then let the clutch draw the engine down to around 4500 where 425ftlbs is now 365hp instead of 258hp.

Trying to slip the clutch with your foot is a hit and miss affair, misses from higher launch rpm can easily cost you more than a clutch hit controller.

Grant

 

He ran a 13.3 weedy......he's so far away from needing any of that advice at all.

Those cars and fcars can run 12s with just free mods.

On top of that 4.10s is likely to much gear. 3.90s work better. Unless he's running a 28" tire which would be to much for that power level.

 

Clutch is top of the list for improving stick shift 60', this thread got to post 32 before anyone even mentioned the clutch!

Grant

 

I agree.....but that's because he's so far off the clutch doesn't even matter yet. This car should easily run in the 12s. Realistically good cam only cars can run 10s. That will take some attention paid to the clutch....but not where he is. There's other stuff going on there that's not working out for him.