matching the combo

[grumpyvette]

Greetings. I have received good advice here before about my C1 vette and help identifying my 350 camshaft - level 3 with operating range 2,400-6,800.

http://www.crower.com/chevy-262-400-pro ... -5860.html

READ THROUGH THIS LINK
http://garage.grumpysperformance.com/index.php?threads/finding-a-machine-shop.321/

Now I'm looking at the powertrain as a whole and trying to figure out if the builder knew what he was doing in terms of gearing. The transmission is a close ratio Super-T10, rear is 3.08 posi, and it's running 235/60-R15 tires.

To me, it feels like there is a fine line between stalling and roasting off the line. At 60-65 mph, it's just above 2000 rpm on the tach which is fun when you nail it at that speed but kind of sucks for slower cruising. Maybe I'm just not driving it right - favoring the lower gears to keep rpm up.

Do I need different gearing given my setup? If so, where do I go from here? I'm not certain I will keep the current motor indefinitely. I may switch to a milder cam'd 350 or perhaps a numbers matching 283 if I run across one someday just to regain some originality but for now, I just want to enjoy what I have and I appreciate your advice.

Thanks in advance.

that cam certainly is a MIS match to the rear gear ratio (3.08) that you listed, especially if your compression is below about 9.8:1. the charts above should be helpful
a cam like thats designed to operate in an engine with near 10:1 compression
the cam you link too would perform noticeably better if your cruising rpm was closer to 2700rpm=3000rpm, especially if the engines compression is up close to 10:1 or slightly higher.
its intended operational rpm band is from about 2500rpm-6000rpm so thats what youll generally want to gear the car to cruise in that rpm band, if max performance is the goal, and yes obviously you can cruise in a lower gear to keep the rpms up, but as stated the engine would also operated best matched to about a 10:1 compression so check that also.
ideally if the car had an auto transmission,you would have a rear gear ratio closer to 3.73:1-4.11:1 with that cam, a 2700rpm stall converter and an over drive top gear transmission like a 200r4 or 4l80e .
your close ratio Super-T10, and rear 3.08 posi gearing is a bit of a mis-match,
ideally for brisk performance usage you'll want the first transmission gear x the rear gear ratio to fall in the 10:1-10.5:1 range.

Borg-Warner Super T-10 P-code 2.43 1.76 1.47 1.00
Borg-Warner Super T-10 S-code 2.43 1.61 1.23 1.00
Borg-Warner Super T-10 U-code 3.44 2.28 1.46 1.00
Borg-Warner Super T-10 V-code 2.23 1.77 1.35 1.00
Borg-Warner Super T-10 W-code 2.64 1.75 1.34 1.00
Borg-Warner Super T-10 X-code 2.64 1.61 1.23 1.00
Borg-Warner Super T-10 Y-code 2.88 1.74 1.33 1.00
Borg-Warner Super T-10 Z-code 3.42 2.28 1.46 1.00
Borg-Warner Super T-10 AA-code 3.29 1.72 1.00 1.00
Borg-Warner Super T10 BB-code 4.17 2.28 1.46 1.00
Borg-Warner Super T-10 CC-code 2.88 1.91 1.33 1.00
Borg-Warner Super T-10 T-code 2.64 2.10 1.46 1.00
Borg-Warner Super T-10 Q-code 2.88 2.10 1.60 1.00




Chevrolet - 262, 267, 283, 302, 305, 307, 327, 350 & 400
Performance level 3 - Pro-Street - High torque with more mid-range. Crisp rpm. Really nice camshaft.
INT/EXH - Dur @ .050” Lift: 242°/248° RR: 1.5/1.5 Gross Lift: .482”/.504” LSA: 114° RPM: 2400 to 6400 Redline: 6800


http://tire-size-conversion.com/tire-height-calculator/

http://users.erols.com/srweiss/calcrpm.htm

http://garage.grumpysperformance.com/index.php?threads/what-the-printed-info-on-tires-refers-too-and-related-info.1946/#post-43912

http://www.hotrod.com/how-to/transm...improving-performance-super-t10-transmission/

http://garage.grumpysperformance.co...for-gear-ratios-shift-points.5665/#post-17217

http://www.tirerack.com/tires/tiretech/tiretech.jsp

http://www.wallaceracing.com/gear-speed.php

http://garage.grumpysperformance.com/index.php?threads/finding-a-machine-shop.321/

viewtopic.php?f=71&t=741

viewtopic.php?f=71&t=555

viewtopic.php?f=52&t=82

viewtopic.php?f=52&t=10705&p=46582&hilit=better+expected#p46582

http://www.crankshaftcoalition.com/wiki ... ationships


POWER TO WEIGHT CALCULATIONS
http://vexer.com/automotive-tools/1-4-mile-ET-HP-MPH-calculator

http://www.wallaceracing.com/et-hp-mph.php

https://robrobinette.com/et.htm

http://www.ajdesigner.com/fl_horsepower_elapsed_time/horsepower_elapsed_time.php

http://www.tuneruniversity.com/blog/2012/03/power-to-weight-ratio/