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#21
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#22
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#23
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1972 Pontiac LeMans Thanks to Fuelab Digital Fuel Delivery Quarter-Max Chassis and Racing Components |
#24
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Car specs:
1978 Firebird Trans Am, all metal body, all glass windows Moser 9 inch rear end, 35 spline axles, spool, 4.29 gears 10 point chromemoly cage Cal-Tracs split mono leafs with bars QA1 double adjustable rear shocks Martz Chassis front subframe with QA1 double adjustable shocks Weld Aluma-Star 15 x 10 with Hoosier 30 x 9 radial slicks in back Weld Aluma-Star 15 x 4 with Hoosier front runners JPT C4 transmission with JW Ultrabell (GM to Ford C4) with Transbrake JPT 10” converter, 4600 rpm stall Weight with driver: 3350 lbs
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www.hobracing.com |
The Following 3 Users Say Thank You to jm455ho For This Useful Post: | ||
#25
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Current engine specs
4.150" bore x 4.0" stroke based on 1978 XX400 block (433 CID) Studded 2 bolt mains with Canton road race oil pan. 250° - 256° (@ 0.050”) solid flat tappet cam, 112° LSA installed at 108 Ported #12 casting iron d-ports with Ferrea valves and beehive springs 166-168 cc intake runners, 70 cc chambers. (11:4 comp ratio) Cast iron intake plenum ported with Q-jet and 1" spacer Heddman 2" headers Intake rockers: Harland Sharp 1.65 (measured 1.72) net lift after lash .570" Exhaust rockers: Harland Sharp 1.50 (measured 1.58) net lift after lash .520" Cranking pressure: 190psi Dyno'd at 520
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The Following 2 Users Say Thank You to jm455ho For This Useful Post: | ||
#26
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Nice job. Those are some great #s for your combo. I think the steep gears and good traction are getting you out of the hole with an impressive 60' time but probably slowing the mph relative to the e.t. In any event you are doing way better than most other combos I have seen that are similar to yours.
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69 Bird w/1970 400 block(409 cubes), #64 heads, hyd. roller, Q-jet by Jeff E., original interior, ps, pdb, th350, and 3.73 gears. Pump gas, street driven muscle. 3800 lbs. race weight. Best, 11.39 @118, my son's car. 79 T/A w/463, Scat crank, Eagle rods, Icon pistons, Lunati solid roller, 262/270, KRE 325 heads, Northwind intake, QF950 carb, full interior, ps, pdb, th350, and 3.73 gears. Pump gas, 3650 lbs. race weight. 10.68 @ 126 so far... no tuning yet. |
#27
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I collect dyno sheets. I have a dyno from you from 2014 which shows 478.7 HP @ 5400 RPM. I also have a dyno which I have labeled as your from 2017 which shows 784.7 HP @ 6800 RPM Thanks, Stan
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Stan Weiss/World Wide Enterprises Offering Performance Software Since 1987 http://www.magneticlynx.com/carfor/carfor.htm David Vizard & Stan Weiss' IOP / Flow / Induction Optimization - Cam Selection Software http://www.magneticlynx.com/DV Download FREE 14 Trial IOP / Flow Software http://www.magneticlynx.com/DV/Flow_..._Day_Trial.php Pontiac Pump Gas List http://www.magneticlynx.com/carfor/pont_gas.htm Using PMD Block and Heads List http://www.magneticlynx.com/carfor/pont_pmd.htm |
#28
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www.hobracing.com |
#29
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If anyone wants to have copies of the dyno sheets that are indicated below, send me your email address in PM, and I will forward them. They are too large to attach here, unless someone knows how to do it.
HOB Dyno sheets Hob24 – RPM - Qjet 800 stock 2 ring version - 32° total timing Hob25 – RPM – Race Qjet single ring version - 32° Hob26 – RPM – Race Qjet – 32° - air flow meter Hob27 - RPM – Race Qjet - 34° Hob28 - RPM – Race Qjet - 36° Hob29 - RPM – Race Qjet - 38° Hob30 - RPM – Race Qjet - 40° Hob31 – RPM – Holley HP750 – 38° Hob32 - RPM – Holley HP750 – 38° - air flow meter Hob33 – Torker 1 – Holley HP750 – 38° Hob34 - Torker 1 – Holley HP750 – 38° Hob35 – Warrior – Holley HP750 – 38° Hob36 - Warrior – Holley HP750 – 38° Hob37 – Ported Hurricane – Holley HP750 – 38° Hob38 - Ported Hurricane – Holley HP750 – 38° - Shaker assembly w/Blockers air cleaner Hob39 – Plenum ported iron intake – Race Qjet – 38° Hob40 - Plenum ported iron intake – Race Qjet – 38° - WFO air cleaner – paper element Hob41 - Plenum ported iron intake – Race Qjet – 38° - WFO air cleaner – K&N element Hob42 - Plenum ported iron intake – Race Qjet – 38° - WFO air cleaner – paper and K&N elements stacked Hob43 - Plenum ported iron intake – Race Qjet – 38° - GM air cleaner – K&N element – ½” spacer under air pan Hob44 - Plenum ported iron intake – Race Qjet – 38° - GM air cleaner – K&N element – ½” spacer under air pan Hob45 - Plenum ported iron intake – Race Qjet – 38° - GM air cleaner – K&N element – ½” spacer under air pan Hob46 - Plenum ported iron intake – Race Qjet – 38° - air flow meter Intake configurations RPM intake 1.25” spacer with opening on secondary side Plenum depths with spacer – 3.5” / 5.5” Torker 1 intake Primary plenum depth – 3.75” Secondary plenum depth – 3” Open spacer – 1.5” Plenum depth with spacer – 4.5” / 5.25” Warrior intake Plenum depth – 2.25” Open spacer – 2.75” Plenum depth with spacer – 5” Ported hurricane intake Rear plenum depth – 3.5” Front plenum depth – 3.0” Tapered open spacer – 1.5” / 2.0” Plenum depth with spacer – 5” Cast iron intake Plenum ported by SD Performance Port matched by me 1’ spacer open on secondary side
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#30
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The 2014 results were from the same engine as now, but with stock non-ported heads. The 2017 results were from an aftermarket block with ported high ports that I built, but eventually sold.
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www.hobracing.com |
#31
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Thanks, Stan
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Stan Weiss/World Wide Enterprises Offering Performance Software Since 1987 http://www.magneticlynx.com/carfor/carfor.htm David Vizard & Stan Weiss' IOP / Flow / Induction Optimization - Cam Selection Software http://www.magneticlynx.com/DV Download FREE 14 Trial IOP / Flow Software http://www.magneticlynx.com/DV/Flow_..._Day_Trial.php Pontiac Pump Gas List http://www.magneticlynx.com/carfor/pont_gas.htm Using PMD Block and Heads List http://www.magneticlynx.com/carfor/pont_pmd.htm |
#32
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This is a fun thread...I've run 3 Drag weeks
ran 12.6 ave 1st one 2019 ran 11.8 ave second one 2021 ran 10.7 ave this year and had a pb 10.55 attached 70GTO Stick shift car 535 ci w/ tiger heads 3585 lb raceweight 4.10 29.5 x10.5 tire 5000 launch I think it needs 4.56 gear but reluctant to change out my trutrac carrier.
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[SIGPIC] Steve |
The Following User Says Thank You to XLR8STEVE For This Useful Post: | ||
#33
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1967 Firechicken, 499", Edl heads, 262/266@0.050" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3550#. 10.01@134.3 mph with a 1.45 60'. Still WAY under the rollbar rule. |
#34
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4.584 330 ft 7.189 660 ft
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1972 Pontiac LeMans Thanks to Fuelab Digital Fuel Delivery Quarter-Max Chassis and Racing Components |
#35
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Awesome thank you so much for looking that up.
The intriguing thing to me is our 69 GP ran same from 330 to 660 (2.60) If we can get the weight moving quicker we should have teens in it. Got something to work towards now. Ours 1.62 4.696 7.301 Last edited by slowbird; 10-22-2022 at 12:27 AM. |
The Following User Says Thank You to slowbird For This Useful Post: | ||
#36
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Was 1.55 60ft 6.99 1/8 11.12@ 119
Switched from an 850 holley to a 1000cfm APD 4150 Now 1.60 60ft 7.02 1/8 11.05@121 4,000 converter 4:56 gear 3350lb footbrake |
The Following User Says Thank You to 15bhardwick For This Useful Post: | ||
#37
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Old 462 w/Iron D combo -
10.60s/10.70s best 60 of 1.48 but usually 1.51 to 1.55 4000 converter 3.73 gear 3295lb transbrake But now I have a 60ft problem as I'm running the same 1.51 60ft on a 10.16 @ 135.63 now with new 474 w/high port combo .. should be like 1.37 now...going to swap to a Victor from a Gutsram to see if the 60 improves Last edited by RBAILEY; 10-26-2022 at 06:16 PM. |
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#38
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I would really like to change intakes on mine to see how it effects it. When I got my e-heads used, they came with a matching 4150 Victor intake and that’s all I’ve run since I got them. The last time my heads were at the machine shop, I took my old Torker II in and asked the guy to try to do whatever needed done to make it work with the heads. For whatever reason, he said it couldn’t be used with the heads. I don’t know if there’s truth to it or if he just didn’t want to mess with it, but I’m certain that given the small cubic inches of the motor, the weight of the car/lack of gear and very limited rpm’s that it would perform better with an rpm performer or torker II. Not to mention with my flat hood and the victor, I have to run the carb right on the intake. I think an rpm with a spacer would run better. Any thoughts?
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1972 Pontiac LeMans Thanks to Fuelab Digital Fuel Delivery Quarter-Max Chassis and Racing Components |
#39
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Hi Adam. We spoke in the staging lanes at Havana a few weeks ago. Ive never tried a victor but my car picked up from 7.5 to 7.3 going from an extrude honed TII and 1/2" open spacer to an RPM manifold with no spacer. Possibly i didn't have enough spacer on the TII but i don't have the clearance for a bigger one. Jon
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'78 Macho T/A DKM#95, 460cid, SRP pistons, KRE 310 D ports, 3" pypes, Hooker 1 3/4" headers, hydraulic roller, 10" Continental, 3.42 gears 11.5 @117.5mph 3900lbs ([_|_] ##\|/##[_|_]) |
#40
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