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#21
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Quote:
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1980 Trans Am - Street/Strip 462 Best: 7.08@95 with 1.49 60' in the 1/8th. 11.17@119.8 in the 1/4. N/A, 3700 lbs, 3.42's, Pump Gas. Admin of Pure Pontiac Powered Outlaws on Facebook. |
#22
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If the valve springs could take 1.65 rockers that would be an easy upgrade.I've always thought your times are pretty good for the cam choice.
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466 Mike Voycey shortblock, 310cfm SD KRE heads, SD "OF 2.0 cam", torker 2 373 gears 3200 Continental Convertor best et 10.679/127.5/1.533 60ft 308 gears best et 10.76/125.64/1.5471 |
#23
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Thanks final parts will be in very soon everything is done and shipped!
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466 Mike Voycey shortblock, 310cfm SD KRE heads, SD "OF 2.0 cam", torker 2 373 gears 3200 Continental Convertor best et 10.679/127.5/1.533 60ft 308 gears best et 10.76/125.64/1.5471 |
#24
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My springs are only good for .590 lift. If I upgrade to 1.65's it will put me at .572/.594 lift. I could easily change valve springs at the same time though because I have to tools to do it while the head is on the engine still. I can check PTV beforehand with a dial indicator and checking springs
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1980 Trans Am - Street/Strip 462 Best: 7.08@95 with 1.49 60' in the 1/8th. 11.17@119.8 in the 1/4. N/A, 3700 lbs, 3.42's, Pump Gas. Admin of Pure Pontiac Powered Outlaws on Facebook. |
#25
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"...It's a guess on 3700 lbs. The car has no insulation, aluminum radiator, water pump, heads, intake, pullies, etc. Electric fans, No AC or Heat. I have taken everything out that I dont need as a "comfortable" street car..."
There are lots of lightweight body parts available. Also, if you can lighten anything that rotates, it will help. There are super light wheels, driveshafts, front drag tires. So, if you can spend the bucks, you can buy lighter stuff. But, just like more power, lighter stuff cost more $$. And, when you start looking for every last bit of ET you can get, you can even consider something like tire air pressure. More air pressure will give some tires less rolling resistance. The smallest width rear tires that will still hook, will be the quickest. The bigger contact patch, of wider tires, will slow the car slightly, after launch. The same goes for softer compound tires & lower air pressure. Shorter rear tires will be like adding a little more rear gear. So, if you need more gear, shorter rear tires will lower ET. The shorter tires also have a smaller contact patch, which will produce less rolling resistance. Obviously, if you use shorter, harder tires, and more air pressure, they must still hook, in order to improve ET. Last edited by ponyakr; 07-27-2017 at 10:50 AM. |
#26
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Quote:
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1980 Trans Am - Street/Strip 462 Best: 7.08@95 with 1.49 60' in the 1/8th. 11.17@119.8 in the 1/4. N/A, 3700 lbs, 3.42's, Pump Gas. Admin of Pure Pontiac Powered Outlaws on Facebook. |
#27
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My 6.90s were 1.51 60s with the 5000 stall and the 9" slicks.
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Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
#28
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BTW spark plugs tell more truth than afr monitors and logs do give you something to compare to. It seems unlikely but if falling too far below powerband on shift you'll lag some. Raising shift point would tell you. Its not a big cam but if its retarded it tends to behave like it is big and kills off low rpm tq and its not big enough to make a "fair trade" up top. |
#29
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It's not just a large enough Cam to use 340 cfm, it's means increased rpm, a better fuel system which you made no mention of even as the car stands now , and a far better full race type rear suspension
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
#30
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Steve25
Read some more. He is NOT currently running 340 cfm heads. First post says 307 cfm. Read further you will find his EFI is more than adequate to meet demand including anything 340 heads will support NA. http://forums.maxperformanceinc.com/...2&postcount=12 Quote:
If his data logs show fuel curve is where it should be then it's likely he's limited by the rpm range he runs vs rpm range the current heads/cam want (higher). He wants to upgrade bottom end to support higher rpm and power in the future. Hence earlier suggestions to upgrade to aftermarket block vs steel caps on 455 and of course with either block, upgrade to forged crank,rods, and better pistons. |
#31
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Quote:
__________________
1980 Trans Am - Street/Strip 462 Best: 7.08@95 with 1.49 60' in the 1/8th. 11.17@119.8 in the 1/4. N/A, 3700 lbs, 3.42's, Pump Gas. Admin of Pure Pontiac Powered Outlaws on Facebook. |
#32
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3.42 gear vs 3.73 isn't worth it to me. My old car got over geared at one point and everything gained in 1/8 was lost and then some in 1/4. 4.10 to 4.56 vs 4.3 that might have been best drag gear for my exact combo. After 4.56 experience I wasn't spending for 4.3 set.
Before putting my 4.10 set back in I borrowed a 3.2 chunk. My 5200 convertor flashed higher and was more like running a glide. With 4.1 my convertor behaved fine normal driving but 3.2 set flared convertor excessively. Bad enough I didn't drive to track to test. A year later instead of putting 9x30 slicks on at track I skipped the hassle and went with 28" "DOT" McCreary tire and 4.10 which worked very well.(a soft compound dirt track tire that was as sticky if not stickier than any of the new at the time BFG or M/T DOT tires) (E-heads we're still a rumor then too) So...leave gears alone unless you go with real tall tires or shifting at 6700+. Today's convertor tech can get you more stall and still acceptable light load cruise. Mine was a new $900 race convertor specd for 4400 stall hot 355 sbc meets divorce sale at 1/3 cost and stalled 5200 rpm on my 440 combo. Pure luck it behaved well street strip. |
#33
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In my opinion, you could reach your goal in one of two ways.
My first thought was simply replacing your rods and pistons with lighter/stronger pieces, have your crank checked then re-balanced for the new rods and pistons, and stud the 2 bolt mains in your block. A moderate solid roller cam, a converter change, and at least 3.73 gears would be needed also. My second thought was building a 535 shortblock. You could probably get to your goal with your current converter and gears......maybe even use the cam you already have now. Downside to this option would be all the extra torque this combo would make. Traction and the strength of your driveline might be some issues to deal with. This would definitely set you up for going faster down the road because we all know no matter how fast it is.....it's never fast enough!
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Greg Weigart IAIIA 520/pump gas/SD 325 E-heads/266-272 SR cam/1050 Dominator/3.73/ET Street Radial Pro/3300lbs/1.35 60'/6.21@110.47/9.77@137.08 Hot Rod Drag Week finishing averages: 2014 - 11.12 @ 118.56 2015 - 10.84 @ 124.97 2016 - 10.56 @ 127.88 2017 - 10.29 @ 130.74 2018 - 10.29 @ 130.53 2019 - 10.16 @ 132.34 2021 - 10.09 @ 132.69 2022 - 10.13 @ 133.07 |
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