Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - need help in getn to a 6k shift point drag race for blower car
View Single Post
  #4 (permalink)  
Old 12-10-2012, 03:27 AM
cobalt327's Avatar
cobalt327 cobalt327 is offline
WFO
 
Last wiki edit: Intake manifold
Last journal entry: 1980 Malibu Wagon
Last photo:
Join Date: Mar 2009
Location: Atlanta
Age: 60
Posts: 5,037
Wiki Edits: 1616

Thanks: 128
Thanked 598 Times in 547 Posts
Quote:
Originally Posted by menoaz View Post
Thxs jester for the info. Heres the cam info. Im only running 5lbs cause i want to walk into this blower set up carefully and im running a btm also. I was running 12.1 sec. normally aspirated and even with 5lbs of boost i can feel a big differ in torque at half throtal.
Dart iron eagles 345cc, 2.25 valve
Doug herbert cam .715/.710. @50 260/270. 305/310
8.7 compression dish forged pistons.
2/850 holley dp with all powervalves plugged with 85 jets all the way around. Yes it runs rich as expected with no power valves.
A balloon plate was installed on converter.
Can you give me a ballpark idea of what i need to have a 6k shift point with the same cam.
Stall? Gears? Or no choice but scrap the cam and find one in the 6000 range.?
I'm not sure I understand your dilemma. If you set a shift light to 5800 (or whatever you need to set it to, to not exceed 6000 rpm), you should be able to upshift manually and not exceed 6000 rpm. The thing is, by short shifting like that, you're not going to get all the cam has in it so the ET might not be anything special, until or unless you run it out to the cam's max HP rpm before you shift.

The 4.88 rear gears are magnifying the fast revving engine. If you were to change the gears to 4.11, say, the rpm will be rising a little slower, but the potential best ET might be hurt if you have tall slicks. But generally speaking, you don't usually use that much gear for a street/strip car w/a blown BBC engine
Reply With Quote
The Following 2 Users Say Thank You to cobalt327 For This Useful Post:
1Gary (12-11-2012), menoaz (12-10-2012)