How high can I rev my H/C car
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I have some ported 241 casting heads w/ PRC dual springs and a G5x3 cam on stock bottom end. I am probably going to run out of gear(4th) at the track aftger swapping to a 3.90 and was wondering if I could bump my rev limit up a little to allow for a few more mph! Btw I am revving to 6500-6600 now!
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I guess your M6 cuz with 3.90 gears i still wouldnt be max in my A4. My car's limiter is set to 6800 rpm, its supposed to shift at about 6700, the peak h/p is about 65-6600. Right now it shifts at 6400 cuz the computer is off, or the tach isnt saying the right number. But my bottom end is stock with 99K miles. Obeviously upgrading rod bolts would be beneficial, but.. As long as your only looking at 6800-7000 on the track (or a few times on the road) I really wouldnt worry about it. Id be more afraid of my rear breaking.
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The car is a MN6 car and the rear is built already and to the other post the cam is a 114 lsa mainly for nitrous but I was considering bumping it up to 6800-7000 only if I need to at the track only in order for me not to shift into 5th gear. I will still probably shift around 6600, but I could run 4th out a little more if needed!
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So rod bolts are the weak link in the bottom end, is there anything else in the bottom end that should be replaced if running up near ~6800rpm, minus more expensive stuff like rods and cranks?
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Okay guys, I am doing a cam only swap and plan on my shift points being at 6600 or 6700. I will be putting in some 7.125 push rods also.. I only ordered the standard installation kit too with a new gm harmonic bolt... Do you guys think I will NEED one of these? Are these the arp bolts you guys were referring to?
Any additional information/explanation would be greatly appreciated.
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For 6800, I'd say ARP or Katech rod bolts and 3/8" pushrods for longterm durability. Higher than that, add Crane/Morel/Caddy lifters, lightweight valvetrain, proper valvesprings, and insure proper valvetrain geometry. If you have the extra funds, look at a lightweight rotating assembly also.