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#1
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Check out my time slip…help me get faster!
Sooo here the combo……
70 4 bolt main block, 461 , compression 10.2, 340 Cfm eheads,, port matched northwind intake, camshaft: 248 intake 254 exhaust 620 gross lift 112 lobe separation. Vacuum pump I am also running a Holley terminator x with a 1300 cfm throttle body…80lb injectors Timing is set at 32-33 degrees at WOT MT e-street R lowered to 14psi Last night at the track ran…..11.68 at 117mph with a 1.77 60ft Was looking for some tips to get faster with my combo….I probably need a cam swap is what im thinking? Thanks boys! |
#2
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60ft looks soft for your speed and ET.Converter suspension?Tom
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#3
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The converter is 3600 and the suspension is PTFB drop springs and Viking adjustable shocks along with anti squat brackets and the front are matching with subframe connectors and solid body mounts and upper tubular control arms along with the gbraces you see
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#4
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Have fun testing at the track its a great hobby, like others have said one change at a time and test. My old combo I had in my car I started at low 12's/114 and eventually ran 10.96 at 123..with the same engine combo,gearing and convertor. Set little goals as well they always help to push the tune..but the dragstrip is where you learn the most..good or bad.
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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 |
#5
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#6
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Looks like you've got the dropped base air cleaner from Butler. Try making a run without the air cleaner on it and see what happens. One of my customer's did that based on my suggestion and his car picked up 1.5 tenths. I believe the air cleaner element comes too close to the middle restricting flow. What rear gears? Transmission & converter? Cal tracks?
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62' Lemans, Nostalgia Super Stock, 541 CI, IA2 block, billet 4.5" crank, Ross, Wide port Edelbrocks, Gustram intake, 2 4150 style BLP carbs, 2.10 Turbo 400, 9" w/4:30 gears, 8.76 @153, 3100lbs |
#7
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The Following User Says Thank You to yellow1098 For This Useful Post: | ||
#8
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I'd also say the MPH's are higher than the ET's, suggestion possibly you're not hooking good. (this would make the 60' slower and ET's)
As others said more combo info may help. But I would try a set of slicks if allowed to run them. If not, what is your launch RPM or how you launch it? Engine seems to be making good power just not getting it all to the ground I think.
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
#9
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Thank you again fellas!!
I am definitely going to get setup for a good dyno tuning session once I find a good place locally that can do it….. I will also be adjusting some timing at the track to see what improvements I can make there as I’m sure there is quite a bit…right now its just my guess and I gave it about 32 degree at WOT I have been playing with the launch the last couple time and the best result so far is just hammering it off idle…powerbraking it to even 2k blew the tires off but I will try more options The Cam is a Hydraulic Roller setup Yes I can plug in the laptop to datalog with the terminator but it’s a bit tough to have the laptop in the car running at the track….But I did find out I can do it on the small handheld |
#10
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Weight? Rear gears?
Th cam and intake and maybe even the 340 cfm heads killing the bottom end? My 78 TA with my 0.030 over 2 bolt 455 320 CFM E heads and a 239/247 HFT Torker II and an 850 when it weighs 3750 with light wheels in good air can run high 10s @124. 1.6 60 ft. Toss rear DOTs and heavier snowflakes on all 4 corners runs 11.50s at about 119 even with the air cleaner on it . But that was with 4.11s and a Continetal convertor about 3500 stall. I will say with my previous SR cam motor when we pulled the air cleaner element out after tuning for the air cleaner it freaking lean popped out the open Shaker that night! So it can make a difference. Even a 14x4" air cleaner on the 500" IA Camaro killed it 0.3 seconds!
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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 |
The Following User Says Thank You to Skip Fix For This Useful Post: | ||
#11
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Im not sure the exact weight its mostly a stock setup with full stock interior and those 17inch snowflakes….whats a good way to lighten her up?
The rear gear is 3:42…. Im definitley not getting all the power to the ground….I’m launching off idle because if I power brake to even 2k it spins like crazy so i definitely need some suggestions to fix that….I’ll definitely work on the slicks setup Long tube headers and 2.5 inch exhaust also if that can be improved? Also wondering how much power I could pick with a good dyno tuning session I will definitely try taking the shaker off also |
#12
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No I can leave off idle but only at probably 70-80% throttle and then I can floor it so Im sure its costing a bunch on the 60ft
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#13
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Back off on the timing at the launch RPM Back off of the enrichment fuel (similar to going with smaller squirters). You should be able to tweak the tune to allow WOT off the line.
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'73 T/A (clone). Low budget stock headed 8.3:1 455, 222/242 116lsa .443/.435 cam. FAST Sportsman EFI, 315rwhp/385rwtq on 87 octane. 13.12 @103.2, 1.91 60'. '67 Firebird [sold], ; 11.27 @ 119.61, 7.167 @ 96.07, with UD 280/280 (108LSA/ 109 ICL)solid cam. [1.537, 7.233 @93.61, 11.46 @ 115.4 w/ old UD 288/296 108 hydraulic cam] Feb '05 HPP, home-ported "16" D-ports, dished pistons (pump gas only), 3.42 gears, 275/60 DR's, 750DP, T2, full exhaust |
#14
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Your 60 ft times suck!
There’s a lot left on the table there. Your cam pick duration wise is not a good match to your 340 cfm CNC heads and that compression needs to go up to 11 to 1.
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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! |
#15
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Imo, there is nothing wrong at all with his cam duration and head flow.
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#16
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Also as far the 2.5 inch exhaust chocking the engine….what do you guys think of electric cutouts? Maybe I just start another thread around that….or if there is any existing ones posting it would be very much appreciated
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#17
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Engine combination should have you in the 120's for mph..exhaust is too small need 3 inch, is your convertor slipping? Is the total timing optimized? Lots left in the combo..a few things are just chocking the power, as mentioned the shaker/air filter setup can choke. What is your rear suspension?
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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 |
The Following User Says Thank You to ta man For This Useful Post: | ||
#18
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Quote:
Im not to sure if the converter is slipping because I am having to leave off idle…I definitely need to learn more about how to address that too The total timing isn’t optimized yet either…I just put about 33 degrees total timing in it but the plan is to get it dyno tuned which I believe will help a lot…. The rear suspension is pro touring F Body drop springs and sway bar….viking adjustable shocks and anti squat brackets along with of course solid body bushings and subframe connectors Thank you guys for all your help….I’m learning a lot even if some of my times suck haha |
#19
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First off, beautiful car. Just my opinion here but I see the car running in the 11 20s at the moment. If you can get the 60 ft to a 1.60 it should do that. Assuming you have 4,25 stroke crank and the car weighs around 3800, I would suggest a rear gear of 3.73 or 3.90 to get your start line ratio more on par. Also I think you stated that with any heavy stall at the line you are blowing the radials up on launch. Change to slicks or you ll need to build some heavy anti squat into the suspension to crush the radials. Then to squeeze everything from the motor try the things the guys have suggested (timing,read the plugs, air cleaner delete), maybe even drop the exhaust and try collector extensions with different lengths. It works. With that and the right conditions you can hit your goal, I know how it is, a couple passes and we always want more, lol. Good luck man, peace.
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#20
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Get somebody to video your launch or do what I did and put a Gopro with suction cup behind a rear wheel to see if you're spinning or not. Mine launched soft and didn't spin so I swapped converters for a huge difference. X2 on get a 3" exhaust which should pick up a few tenths and bring mph up. Maybe bump timing up, too. My D ports liked 37°. I think a chassis dyno would really get you on track. Very nice car and build, should go easy hi 10s when sorted out.
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Chris D 69 GTO Liberty Blue/dark blue T400, 9" w 3.50s, 3905lbs 461, 850 Holley, T2, KRE 310s, Comp HR288 w 165s, RA manifolds, 11.60@114, 1.58/60 The spare: 467, 850 Holley, T2, Edelbrock Dport 310cfm w RA manifolds, HFT 245/251D .561/.594L, 11.59@ 114, 1.57/ 60' |
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