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#1
09-30-2023, 04:55 PM
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Converter issue
Went to test and tune today and made 2 passes. First one about what I expected, 10.81. @ 124. On the 2nd one there was a 'blip' on the 2-3 shift. Hard to describe but almost like shifting out of gear and back into gear in a fraction of a second. Anyway, the run was almost identical to the first one, 10.80 @ 125. Returned to the pits, loaded up my stuff and headed home. As soon as I got on the road and started to accelerate I knew something wasn't right. No noise or vibration but at 2000 rpm I was only going 40 mph. Should have been around 46 or 47. The converter is a PTC unit that I bought way back to use with the 403. It was perfect behind that engine but not the best behind the new 463. Is it possible that I damaged this converter in a way that would cause it to act like it was super loose? This is uncharted territory for me. Any ideas?
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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. |
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#2
09-30-2023, 05:17 PM
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Does it act loose if you drive it held in 1st gear?
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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! |
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#3
09-30-2023, 05:46 PM
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If it flairs on the gear change that is usually the trans, not the converter.
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#4
09-30-2023, 07:51 PM
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Quote:
__________________
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. |
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#5
09-30-2023, 07:53 PM
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Quote:
__________________
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. |
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#6
09-30-2023, 10:03 PM
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I agree with John, if it seem to slip on the shift it's the trans not the converter.
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| The Following User Says Thank You to slowbird For This Useful Post: | ||
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#7
10-01-2023, 12:46 AM
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Roll your sprag ?
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#8
10-01-2023, 01:24 AM
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Quote:
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#9
10-01-2023, 07:05 AM
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Quote:
__________________
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. |
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#10
10-01-2023, 07:45 AM
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Quote:
I believe when the sprag gets rolled you loose 2nd gear. I also have seen Techs measure the hub on the direct drum for a spec size. My understanding is to replace the drum once the sprag is rolled on the drum. The 4L80E drum is a good upgrade with 34 element sprag. Upgrade the piston while in there to billet aluminum, and remove the second sealing ring for a dual feed. There is a few other mods for dual feed. Also replace the snap ring to a spiral locking ring.
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68 Firebird. IA2 block, 505 cu in, E-head, Solid roller 3650 weight. Reid TH400 4:11 gear. 29" slick. Best so far 10.12@133 mph. 1.43 60 ft. 76 Trans am, TKX .81 o/d, 3.73 Moser rearend, 468 with KRE D-ports, Doug headers, 3" Exh. |
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#11
10-01-2023, 08:22 AM
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Check for pink fluid; if pink then aluminum Stator got a stripped sprag.
Check for smokey fluid: frictions getting heat. Probably just a low fluid level. Or a clogged filter. |
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#12
10-01-2023, 10:24 AM
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Unless the convertor had an issue and pumped crap into the tranny! How I picked up over 0.5 seconds with a new loose convertor and a fresh trans!
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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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#13
10-01-2023, 01:43 PM
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Quote:
__________________
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. |
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#14
10-01-2023, 10:44 PM
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I had Trans King in Galveston redo an 8" convertor for me. After a number of passes with my first roller E head motor started slipping. We were just going to swap transmission. Pieces came out of the convertor! Only one i had laying around was a n A-1 I had loosened for the old RAIV 400 that was in the car. Swapped it and a Phoenix TH350 I got form a Buick buddy and the car really woke up! Flashed to 5000 but had 1.5s 60 fts. It was so loose it would flash up the 3000 pulling p on the trailer.
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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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#15
10-31-2023, 06:46 PM
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Nice times .be heading to the track Fri to test my new converter.
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76 T/A 455, cnc chamber E heads,OF hyd roller ,yella terra shaft rockers 11.47 119 |
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#16
10-31-2023, 07:39 PM
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Joe I hope to make it out as well. Had the 350 gone through and the PTC converter restalled to 3000. Will see what happens next.
__________________
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. |
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