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#1
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First time at the track
Tonight was the first time I've run my car. Was about 90* my first couple passes. Was nothing spectacular but an absolute blast! My first pass was 14.5@101mph with my best being 13.5@103mph. I ran on street tires and fought traction issues every pass. The first 2 passes I was shifting into 4th about 100' before the finish, then the last few I was crossing the line in 3rd gear @6300ish rpm. My 60' is terrible and I feel like if I could get that down I could get into the 12s.
Attatched are my timeslips. I tried to keep them in order: I ran friends and won each time except my last which was my 13.5 pass.
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1967 GTO, 432 (428+.030), 4-bolt mains, factory Nodular crank, scat rods, icon dished pistons, Lunati HR 243/251@.050, .618/.622 lift, Edelbrock 72cc round port heads, 10.5:1, offy 2-4 intake, Edelbrock 650cfm carbs, Super T10 trans (2.64 first), BOP 10 bolt w/ Eaton posi and 3.36 gears |
The Following 5 Users Say Thank You to 67gtospud For This Useful Post: | ||
#2
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You even beat the last guy on ET , but he got started a lot sooner than you did.
Congrats on getting out and putting it in the wind ! G.ood T.imes O.ften |
#3
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Did you get that wonderful shaky gas pedal leg waiting on the line?
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#4
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There's good potential there ( 103 mph ) if you hook it up and stop sleeping at the line, lol!
According to my chart if your car weighs in between 3600 and 3800 lbs your then making between 514 and 543 HP at the flywheel and you should beable to cut mid 12s
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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! |
#5
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What? 103mph at 3800lbs is nowhere near 500hp. But i do agree, with more tuning there is mid 12's
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#6
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Just asking here but how do u calculate this mph weight to hp???
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1973 Firebird Navajo Orange w/shaker,1973 400/461,1972 Intake SD CNC'd,1977 Q-Jet 800 CFM w/ Cliffs Kit,Tanks Inc PA4 255 Walbro intank pump ,-8an feed/return,RobbMc Regulator,RobbMc 40 micron filter,253 CFM 6x-8's w/H.S 1:5 Roller Rockers,SD Stump Puller H/R Cam 230/236 @.050 112 lobe separation 565/.570 lift,Crower Solid Rollers,28150 Hedman Headers,3" exhaust,full tailpipes,350 Turbo,9.5" 3200 Converter,3:42 gear,8.5 posi,C/E slide-alinks,Koni adj frt shocks,Best 12.18@110.55 Lookin for 11's |
#7
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Great to hear ya got out and ran it through the gears ..... not sure if I will get out this year at all....hope to before the car comes off the road .....
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1973 Firebird Navajo Orange w/shaker,1973 400/461,1972 Intake SD CNC'd,1977 Q-Jet 800 CFM w/ Cliffs Kit,Tanks Inc PA4 255 Walbro intank pump ,-8an feed/return,RobbMc Regulator,RobbMc 40 micron filter,253 CFM 6x-8's w/H.S 1:5 Roller Rockers,SD Stump Puller H/R Cam 230/236 @.050 112 lobe separation 565/.570 lift,Crower Solid Rollers,28150 Hedman Headers,3" exhaust,full tailpipes,350 Turbo,9.5" 3200 Converter,3:42 gear,8.5 posi,C/E slide-alinks,Koni adj frt shocks,Best 12.18@110.55 Lookin for 11's |
#8
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Nice job, 1st time out. Be careful.
, its addicting..lol..just go out and have fun |
#9
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You will never get there with street tires.
Put some drag radials on that bad boy, and it will be a totally different car. Nitto 555s are a great tire for street use with occasional trips to the track. If you really want to hook (as the time slip sickness progresses) Mickey Thompson ET Street SS' is one hell of a good tire.
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77 Trans Am, 469 w/ported E-Heads via Kauffman, matched HSD intake, Butler Performance forged rotating assembly, Comp custom hyd roller, Q-jet, Art Carr 200 4R, 3.42s, 3 inch exhaust w/Doug's cutouts, D.U.I. Ignition. 7.40 in the 8th, 11.61@116.07 in the quarter...still tuning. |
#10
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Very Nice! Shaving a full second off your et over the course of a few passes is very steep learning curve. I calculated your overall gear reduction in 1st gear at 8.7‘ish which goes to show, these big torque engines just don’t need a ton of gear reduction to haul the mail. Definitely update as you experiment with different tires.
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#11
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Quote:
Great combo. Do you have an idle videos with that cam? |
#12
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Awesome that you're getting out there and having fun! 5 runs in less than 5hrs sounds like a well run track. I spend 4hrs there to get 2 runs here! You've got some great parts in that engine, definitely a good bit more in it unless there's an elevation factor involved . Trans and rear might be weak links which you will discover with traction. Fuel delivery and traction will get you there. Good luck!
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Chris D 69 GTO Liberty Blue/dark blue 467, 850 Holley, T2, Edelbrock Dport 310cfm w Ram Air manifolds, HFT 245/251D .561/.594L, T400, 9" w 3.50s 3905lbs 11.59@ 114, 1.57/ 60' |
#13
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Just remember next time out leave on the last yellow act like the green isn’t even there. Good times for first time out car runs good.
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#14
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Thanks guys! A little shakey let the first pass but not bad lol. The car hit the scale right at 3600 with a full tank of gas, 3820 with me in it. With the hot air my AFR gauge was reading very rich all night and I forgot to bring jets with me to lean the carbs out. I want to put slicks on, but not on this 10 bolt! I do have a bad habbit of sleeping at the light, I'm working on that. I'll likely go out once more this year in September on a cooler night.
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1967 GTO, 432 (428+.030), 4-bolt mains, factory Nodular crank, scat rods, icon dished pistons, Lunati HR 243/251@.050, .618/.622 lift, Edelbrock 72cc round port heads, 10.5:1, offy 2-4 intake, Edelbrock 650cfm carbs, Super T10 trans (2.64 first), BOP 10 bolt w/ Eaton posi and 3.36 gears |
#15
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Quote:
Always a steep learning curve the first time. I think you will easily drop 1 second and gain 10mph with just tuning. The potential of the engine is an easy mid 11 second/120mph range slip
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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 Last edited by ta man; 08-15-2020 at 12:24 PM. |
#16
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I would imagine those calculators figure perfect traction and conditions. I don't know my actual hp, but can assure its more than 327 lol. I was spinning through 1st, and spun after my 1-2 shift on every run.
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1967 GTO, 432 (428+.030), 4-bolt mains, factory Nodular crank, scat rods, icon dished pistons, Lunati HR 243/251@.050, .618/.622 lift, Edelbrock 72cc round port heads, 10.5:1, offy 2-4 intake, Edelbrock 650cfm carbs, Super T10 trans (2.64 first), BOP 10 bolt w/ Eaton posi and 3.36 gears |
#17
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Quote:
I used to tune for power on sketchy track nights by not looking at the et and concentrating on the mph..as long as the mph was climbing I knew I was going the right way as far as tuning.
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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 |
#18
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I also did the mph-rpm calculators and found my tach is off (which I suspected). Seems its off about 600rpm up around 6000 (tach reading). I thought I was shifting at 6k but it was more like 5500 actual rpm. The car was still pulling hard so I'll have to remember to add that on when I'm shifting.
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1967 GTO, 432 (428+.030), 4-bolt mains, factory Nodular crank, scat rods, icon dished pistons, Lunati HR 243/251@.050, .618/.622 lift, Edelbrock 72cc round port heads, 10.5:1, offy 2-4 intake, Edelbrock 650cfm carbs, Super T10 trans (2.64 first), BOP 10 bolt w/ Eaton posi and 3.36 gears Last edited by 67gtospud; 08-15-2020 at 02:06 PM. |
#19
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Quote:
Most factory tachs read fast, the manufacturers may have done this on purpose to keep the connecting rods inside the block.
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68 GTO,3860# Stock Original 400/M-20 Muncie,3.55’s 13.86 @ 100 Old combo: 462 10.75 CR,,SD 330CFM Round Port E's,Old Faithful cam,Jim Hand Continental,3.42's. 1968 Pontiac GTO : 11.114 @ 120.130 MPH New combo: 517 MR-1,10.8 CR,SD 350CFM E's,QFT 950/Northwind,246/252 HR,9.5” 4000 stall,3.42's 636HP/654TQ 1.452 10.603 @ 125.09 http://www.dragtimes.com/Pontiac-GTO...lip-31594.html |
#20
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You'll have no trouble getting into the 12's with a good 60' time. I'm guessing about 12.3 at 113.
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