Errr... Torque peaks at 5000, stays level til 5500. HP peaks at 4000, stays level till 4500. According to Dyno2000. Again, I agree 100% with your diagnosis. 8 more cubes on new rings, 1.5 more compression, much smaller tires all around. Much humidity, but at near ZERO altitude (Angleton is at about 20 ft above sea level, maybe less!). I am not trying to beat Simon...we have talked for a year or so comparing numbers, and he has me beat fair and square. But...BUT...his intake and heads are constricting, IMHO, regardless of his extra cubes. He knows it, and will eventually fix it. He is also not getting traction, and knows this is costing him. He is also running stock 2.79 and wants to fix that as well. Etc. etc.... Sorry to but wait...this is MY thread!!! When I ran up to 6k, I think I recall losing 2-tenths or so, over 5500. It seems that 5k shifts worked best for my setup. I recognize I screwed up by going 3.80 then putting on those 255/60s. But, it looks WICKED!!! and still handles well on the freeway. Also, still beats 90s mustangs at red lights. THAT is the sacrifice I need to make to keep this thing fast, but streetable...
Also, according to Dyno2000, 311 cubes (I think Simon is .060 over, not .030) is good for 296 HP and 331 Torque. Same HP as my setup (assuming same heads, cam, etc.) but 7 more torque... Doesn't sound right, but that is what the computer is spitting out at me...
seams like we need a iowa/ texas matchup:evilsmile id like to see both run 1/4 mile i think they are pretty close to same even though simon has 1.5 points , 8 cubes, etc BUT Scott has a mech. advantage with his gears and spool doesnt hurt either... maybe if you were to race it more scott, you could buy 26 inch slicks or drag radials , something a little shorter than the tires you got now...that should help you big time...
Did you mean vise-versa on TQ and HP rpms??? In theory, you would shift at 6k and set up tranny and gears to put you in the next gear at 3500 rpm. Technically, a good strip car should have gears that put the shift rpm, base MPH, top gear, and the traps all together simultainiously... Then you build your tranny and get a stall speed so that launch and upshift rpm are at your peak TQ rpm. You probably know all this, nevermind my rambling... Dave
AGAIN I agree 100%. But the taller/bigger tires are for looks and highway/streetability. IF I ever got serious about racing, I would get a second set of rims and put slicks on them...which I might, someday, if the right rims show up. I don't plan on spending any serious money on rims I "might" use once or twice a year. A buddy in the 'hood has some MT slicks on rims, and I keep asking to borrow them, just to see what would happen. But, he keeps stalling...I think he is afraid to see what my '74 block will do to his 5.0-drop-in!!!
In theory, but his tires negate that leverage being 2" taller. 2.79 gears actually help with traction, and the short tires add some leverage. Also, the intake Simon is using will be VERY 'high gear friendly'... That intake needs high gears to be effective. If he had low gears, his car would drive like a dump truck, shifting every 20 feet.
werd a way to figure at least 1/4 mile and prolly 1/8 for that matter too, what ever RPM you are goin though the traps is the RPM you want to shift at...as long as your still pulling hard if your car is goin though the traps at 5800 and its not pulling any harder , shift it at 5800 , if its still pullin at 5800 move your shift point up to 6000 if all is right like dave said it all should come together at the big end
my cam says 5200 so i shift at 5000... i really havent tried shifting at anything less.. i did try and shift higher and it bogged it down so bad the run was a total waste. it runs its best when i shift mine at 5000... the colder dense air in iowa?.... well i was running it during the summer,... heat and humidity and it ran a 14.3 to 14.5.. when it got cooler... 50's it ran a 14.2 but that was after i got the edelbrock fuwl pump put on, a hole cut in the hood and a scoop wlded on, and i put a block off plate under the scoop so all air is coming in the scoop.it gained .2 int he quarter from these mods and the temps being cooler. if i had scott's heads on my engine, my car would scream.. and of course the gears and spool wouldnt hurt either. i have thought about geting 3.80 gears, so i dont lose the streetability.. but would 4.11's be better with a 2556015 et street tire on a 15x8 rim?
YUP, I think that Simon's small tires and high gearing are what makes him kick my a$$ (but not by much). But, I don't want to lose my "look" and highway-ability to gain tenths-of-seconds on the 1/8...
I would get some stock rims and throw slicks on them... 14" rims with 25-26 inch slicks would be cool. Taller tires are lighter than taller stock steel rims, that is why I say 14" rims. My uncle uses 14" slots (very old stuff) with Hoosier 14" slicks. Dave
The kid in the 'hood has fairly small slicks, but his dad won't let him race, and his uncle was going to sell me the slicks, but gave them to the kid, so now they sit in the garage, never to be used (until the kid is old enough to overcome his dad). I would LOVE to try them out...
The 5k bog is a function of the intake you are using. If your cam is rated to 5200, you well could be leaving HP on the table with that intake. I ran 4.11s with 25.5" tires. Definately NOT dual plane intake territory. Definately needed slicks too. No traction anytime, anywhere... at least on that one tire!
