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#1
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2021 Updates..
Updates and changes for the car for this year. Calvert split mono's replacing the stock leafsprings and caltracs. Replacing the rear shocks with Calvert single adjustables (temporary..had a great deal on them). Rear end is out ..axle tubes are welded..
The big change is a gear swap...for a few reasons..to lessen the load on the transmission, to see how the Continental reacts to the gear swap, swapping the UCC convertor back in during the season as well, looking to swap some sort of an overdrive into the car in a year or 2, dropping the 60 foot time down to sub 1.5's and also the car is driven more local not a lot of long highway miles. So its a big change and definitely "geared" towards dragstrip performance and also I think this car has proved..you don't need a lot of gearing to have an all round performing car both on the strip and the street. I've also had some gentle nudging to see what would happen and document the results. So no more 308 gears for now... 3.73's will be in this week. Best et so far is 10.761 at 125.64 (car has seen 127mph in 2020) with a 1.5471 best 60ft A few pics..the 4th picture is the factory spring perch that I just cleaned quick..
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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; 05-02-2021 at 03:25 PM. |
#2
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No doubt you will feel a difference. I'm going to change one of my cars from 3.23 to 3.73.
I'll be looking for the results. I'm thinking .5 to .6 second improvement in ET. Maybe a wee bit more. That is a big jump in ratio. Good luck with it. |
#3
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Im thinking 2 tenths gain..it may pick up more.
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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 |
#4
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Nice! Very interested to see the gains. Thinking aboit replacing the factory mono leaf in mine with a set of Calvert split monos but havent pulled the trigger yet.
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#5
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With the 3.73's you really won't need, (may not even want) that low gear set currently in the trans.
With it, it will sure be a head snapper, lol. It'll definitely tighten up the converter. 3.73's will however work real nice if you're planning an overdrive swap in the near future though. 4L80's with the 2.48 first gear works really well with 3.73's. |
#6
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How do those Calvert split monos ride on the street? Maybe you haven’t driven it yet.
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#7
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Its not assembled yet..waiting on parts.
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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 |
#8
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#9
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The info I'm curious about, for the moment, is how the 3.73's do with your current trans, having its lower gear set in it (what ratio?) Might be some magic there...
How much gear ratio would you gain by going to the 4l80 and 3.73 setup? Did you have any mods done to the UCC converter since you last used it?
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1977 Black Trans Am 180 HP Auto, essentially base model T/A. I'm the original owner, purchased May 7, 1977. Shut it off Shut it off Buddy, I just shut your Prius down... |
#10
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Low gear set is a 2.75. UCC convertor has sat on the shelf since pulled. I'm going to run it this year to get data points on it for a refresh if needed.
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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 |
#11
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Wow quite a change and I'm interested in your results as usual
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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' |
#12
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following... will be interesting to see what the 3.73s do vs the 3.08, will definitely increase the RPM at the end of the track. good luck!
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#13
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With the 2.75, and 3.73's out back, that'll be almost exactly like running 4.10's.
My 2.48/4.10 setup is slightly less effective. 10.16 vs your 10.25 Is the UCC converter looser than your current converter? I'm guessing that's the reason for the converter swap back to the UCC, since this gear change will tighten it up quite a bit. Will be interesting and fun to play with this summer. |
#14
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Yes that's part of the reason ,to use the whole rpm range in all gears..I'm only crossing at 5200 rpm with 10 to 12 percent convertor 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; 05-03-2021 at 11:38 AM. |
#15
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Quote:
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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 |
#16
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Running 10s with it would suggest you have a "well built" one. Maybe different than apparent "near zero" slipping Continental..
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#17
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Quote:
It has been a great convertor..has been behind 2 different cast head 455 engines, 2 different aluminum head 455's..used for 308 gears and 342 gears.
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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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Any idea where your current engine makes peak tq and hp?
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#19
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I would have to check with Dave Bisschop again but I would think hp peak is 6000 to 6200rpm..and peak torque in the 4200 to 4500 rpm range.
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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 |
#20
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Quote:
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