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#1
03-10-2023, 06:29 PM
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STOCK 403 '79 T/A - at the track and on the dyno. Guess the results
A good friend of mine. Kevin, has a 27k original mile 403 WS7 (WS6 suspension, but with rear drum brakes) 2.73 posi Trans Am.
The ONLY mod that has been done, is the scoop is cut open. Untuned carb, original exhaust with the original pellet catalytic converter still in place. Timing set at factory specs. 245/60-15 BFG Radial T/As. Back when these cars were new, we did not have chassis dyno's and no track was really convenient, so I always wondered just how good/bad these cars performed when TRULY "stock". Kevin's car is the closest to showroom stock that I've been around in a long time, so I talked him into going to the track and to let me make a few dyno pulls :-) We ran it at the track last Friday, and did the dyno today. I'll post the results later, as I wanted everyone to have a chance to take a guess. Track had a DA of 1200' when we got there, and was around 700 when he made his best pass. Dyno is a DynoJet using their "STD" correction factor. EDIT: I'll ask Kevin to verify, but I believe the race weight was right at 3900. Guess away :-)
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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 My webpage http://lnlpd.com/home Last edited by Lee; 03-10-2023 at 06:47 PM. Reason: typo |
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#2
03-10-2023, 06:32 PM
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Bone stock 15.50@90?
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#3
03-10-2023, 06:45 PM
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15.10. 150 hp.
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70 TA, 467 cid IAII, Edelbrock D-port heads, 9.94:1, Butler HR 236/242 @ .050, 520/540 lift, 112 LSA, Ray Klemm calibrated Q-jet, TKX (2.87 1st/.81 OD), 3.31 rear https://youtube.com/shorts/gG15nb4FWeo?feature=share |
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#4
03-10-2023, 06:48 PM
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16.2. RWHP- 150
stock 78 W72 4 sp cars did upper 15's, ive seen 15.6-15.9. autos did mid 16's according to some magazines. |
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#5
03-10-2023, 06:50 PM
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The above guess sounds good to me also.
It’s really too bad that Old’s put such crappy heads on those 403 motor’s because there Bore to Stroke ratio they have is darn good.
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I do stuff for reasons. |
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#6
03-10-2023, 07:00 PM
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Quote:
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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 My webpage http://lnlpd.com/home |
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#7
03-10-2023, 07:08 PM
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That is what I was thinking, low 16's and mid 100's on dyno.
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#8
03-10-2023, 07:16 PM
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15.9 at 89. Guessing 155hp.
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#9
03-10-2023, 07:17 PM
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15.90 at 85 mph 1/4 mile.
155 RWHP.
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1964 Tempest Coupe LS3/4L70E/3.42 1964 Le Mans Convertible 421 HO/TH350/2.56 2002 WS6 Convertible LS1/4L60E/3.23 |
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#10
03-10-2023, 07:32 PM
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I’m on same page as those above- low 16s and 150-170 on chassis dyno.
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Will Rivera '69 Firebird 400/461, 290+ E D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears '64 LeMans 400/461, #16 Heads, HR 230/236, TKO600, 9inch Rear, 3.89 gears '69 LeMans Vert, 350, #47 heads: Non-running project |
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#11
03-10-2023, 07:32 PM
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16.55@83 mph. 145 HP at the wheels.
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#12
03-10-2023, 08:05 PM
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With the 2.73 rear, 17.03
Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
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#13
03-10-2023, 11:54 PM
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Worst nightmare
Back when these cars were new I used to hunt them mercilessly.
I loved it when the girlfriend of the owner was sitting in the passenger seat. Friday and Saturday nights were the best times to find these cars running around with their owners not expecting any real competition from some old Bug. Note the dial-in on the side window.  Orange County International Raceway 1978, I was 18 at the time.
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1964 Tempest Coupe LS3/4L70E/3.42 1964 Le Mans Convertible 421 HO/TH350/2.56 2002 WS6 Convertible LS1/4L60E/3.23 |
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#14
03-11-2023, 12:31 AM
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I had a 403 79 TA,back in the early 90's,,,,If I remember correctly mine had 2.41 gears? Im assuming they were standard? Id guess 16 sec flat
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72 lemans,455 e-head, UD 255/263 solid flat,3.73 gears,,,10" 4400 converter,, 6.68 at 101.8 mph,,1.44 60 ft.2007 (cam 271/278 roller)9"CC.4.11gear 6.41 at 106.32 mph 1.42 60 ft.(2009) SOLD,SOLD 1970 GTO 455 4 speed #matching,, 3.31 posi.Stock manifolds. # 64 heads.A factory mint tuquoise ,69' judge stripe car. 8.64 @ 87.3 mph on slippery street tires.Bad 2.25 60ft.Owned since 86' |
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#15
03-11-2023, 12:34 AM
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Quote:
A nice breakdown of which version got what gears here: https://forums.maxperformanceinc.com...bQJxV0s4zmZHfM I've seen 2.73 geared 403's, but never seen one with 3.23's - THAT would be interesting to see at the track.
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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 My webpage http://lnlpd.com/home |
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#16
03-11-2023, 01:46 AM
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I bought a '79 T/A 6.6 litre WS-6, 4 speed Trans Am in '83 from the original owner with 22K miles on it for my future wife. Rear axle was 3.23 posi, absolutely all stock, no nothing. Took it to Island Dragway in New Jersey, don't know the elevation, but not much, definitely under 1000'. Best I could get was 16.1 sec at 88 mph. I made 4 changes to it. Opened the shaker scoop, straight piped the cat, lighter distributor advance springs, and richer secondary rods in the Q-Jet. The car felt WAY faster. The engine would pull right to 5000 rpm instead of falling off at 4000. I was hoping for 15.0 or less at about 94/95 mph , but my 18 year old BIL spun the car on a wet day and wrecked it before I had a chance to run it again. The wife replaced it with a Mitsubishi Eclipse.
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#17
03-11-2023, 03:35 AM
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Back in the day racing a hot Bug on the street was usually a bad idea. They get traction. There was a guy who had a 10 sec Giah at our track.
Had a bus engine in it. Big bore kit, duel carbs. |
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#18
03-11-2023, 08:51 AM
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15.9 @ 84 MPH
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 Last edited by Stan Weiss; 03-11-2023 at 09:13 AM. |
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#19
03-11-2023, 12:19 PM
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My 78 TA with 2.56 TH350 180 HP motor with the cat and a mild 220/220 Cam Dynamics cam ran 14.90s-barely hitting 3rd!
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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 |
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#20
03-11-2023, 01:17 PM
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Lee that was at the old Dickinson Track and in good air
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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 |
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