#1  
Old 05-02-2021, 03:16 PM
ta man ta man is offline
Ultimate Warrior
 
Join Date: Apr 2006
Location: Clinton,Ontario,Canada
Posts: 5,348
Default 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..
Attached Thumbnails
Click image for larger version

Name:	rearend1.jpg
Views:	302
Size:	61.7 KB
ID:	565798   Click image for larger version

Name:	rearend2.jpg
Views:	316
Size:	60.0 KB
ID:	565799   Click image for larger version

Name:	rearend3.jpg
Views:	288
Size:	115.6 KB
ID:	565800   Click image for larger version

Name:	rearend4.jpg
Views:	287
Size:	63.3 KB
ID:	565801  

__________________

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  
Old 05-02-2021, 03:27 PM
napster's Avatar
napster napster is offline
Chief Ponti-yacker
 
Join Date: Sep 2005
Posts: 719
Default

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  
Old 05-02-2021, 03:43 PM
ta man ta man is offline
Ultimate Warrior
 
Join Date: Apr 2006
Location: Clinton,Ontario,Canada
Posts: 5,348
Default

Quote:
Originally Posted by napster View Post
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.
Im thinking 2 tenths gain..it may pick up more.

__________________

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  
Old 05-02-2021, 04:17 PM
Scott Stoneburg's Avatar
Scott Stoneburg Scott Stoneburg is online now
Ultimate Warrior
 
Join Date: Sep 2007
Posts: 2,179
Default

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.

  #5  
Old 05-02-2021, 07:16 PM
Formulajones's Avatar
Formulajones Formulajones is online now
Ultimate Warrior
 
Join Date: Jan 2012
Posts: 10,794
Default

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.

__________________
2019 Pontiac Heaven class winner

https://youtu.be/XqEydRRRwqE
  #6  
Old 05-02-2021, 08:29 PM
promptcritical promptcritical is offline
Senior Chief
 
Join Date: Apr 2014
Posts: 260
Default

How do those Calvert split monos ride on the street? Maybe you haven’t driven it yet.

  #7  
Old 05-02-2021, 08:40 PM
ta man ta man is offline
Ultimate Warrior
 
Join Date: Apr 2006
Location: Clinton,Ontario,Canada
Posts: 5,348
Default

Quote:
Originally Posted by promptcritical View Post
How do those Calvert split monos ride on the street? Maybe you haven’t driven it yet.
Its not assembled yet..waiting on parts.

__________________

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  
Old 05-02-2021, 09:35 PM
promptcritical promptcritical is offline
Senior Chief
 
Join Date: Apr 2014
Posts: 260
Default

Quote:
Originally Posted by ta man View Post
Its not assembled yet..waiting on parts.
Figured. Sorry.

  #9  
Old 05-02-2021, 09:51 PM
77 TRASHCAN's Avatar
77 TRASHCAN 77 TRASHCAN is offline
Ultimate Warrior
 
Join Date: Oct 2008
Location: 31May2013 Temporary home to the world's widest (that we know of) tornado. Lord, NO more Please...
Posts: 6,591
Default

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?

__________________
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  
Old 05-03-2021, 01:00 AM
ta man ta man is offline
Ultimate Warrior
 
Join Date: Apr 2006
Location: Clinton,Ontario,Canada
Posts: 5,348
Default

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.

__________________

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  
Old 05-03-2021, 07:45 AM
OCMDGTO's Avatar
OCMDGTO OCMDGTO is offline
Ultimate Warrior
 
Join Date: Sep 2014
Location: Ocean City Md
Posts: 1,194
Default

Wow quite a change and I'm interested in your results as usual

__________________
Chris D
69 GTO Liberty Blue/dark blue 467, 850 Holley, T2, Edelbrock Dport 310cfm w Ram Air manifolds, HFT 245/251D .561/.594L, T400, 9" w 3.50s 3905lbs 11.59@ 114, 1.57/ 60'
  #12  
Old 05-03-2021, 09:05 AM
78w72 78w72 is offline
Ultimate Warrior
 
Join Date: Nov 2007
Location: iowa
Posts: 4,683
Default

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!

  #13  
Old 05-03-2021, 10:42 AM
Formulajones's Avatar
Formulajones Formulajones is online now
Ultimate Warrior
 
Join Date: Jan 2012
Posts: 10,794
Default

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.

__________________
2019 Pontiac Heaven class winner

https://youtu.be/XqEydRRRwqE
  #14  
Old 05-03-2021, 11:30 AM
ta man ta man is offline
Ultimate Warrior
 
Join Date: Apr 2006
Location: Clinton,Ontario,Canada
Posts: 5,348
Default

Quote:
Originally Posted by 78w72 View Post
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!
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.

__________________

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  
Old 05-03-2021, 11:35 AM
ta man ta man is offline
Ultimate Warrior
 
Join Date: Apr 2006
Location: Clinton,Ontario,Canada
Posts: 5,348
Default

Quote:
Originally Posted by Formulajones View Post
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.
After looking at my data from last years runs I found the Continental is slipping about 10 to 12 percent at the stripe. So first thing is to see how the Continental reacts to the gear change. The next step will be to put the UCC in that was built for 342 gears but slipped too much for 308's..it should flash to 3800 to 4000..I want to see what the data is on it so I can send it back if needed for a restall.

__________________

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  
Old 05-03-2021, 11:47 AM
pastry_chef's Avatar
pastry_chef pastry_chef is offline
Suspended
 
Join Date: May 2003
Location: Ottawa
Posts: 2,300
Default

Quote:
Originally Posted by ta man View Post
After looking at my data from last years runs I found the Continental is slipping about 10 to 12 percent at the stripe.
Running 10s with it would suggest you have a "well built" one. Maybe different than apparent "near zero" slipping Continental..

  #17  
Old 05-03-2021, 12:12 PM
ta man ta man is offline
Ultimate Warrior
 
Join Date: Apr 2006
Location: Clinton,Ontario,Canada
Posts: 5,348
Default

Quote:
Originally Posted by pastry_chef View Post
Running 10s with it would suggest you have a "well built" one. Maybe different than apparent "near zero" slipping Continental..
It sure has many passes on it. It was also originally built for a 342 geared full weight 80 Trans Am with a 455 6x head engine. So its being worked pretty hard in drive with the current car with the 308's and 100 to 150 hp more than the original spec'd engine.
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.

__________________

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  
Old 05-03-2021, 12:25 PM
slowbird's Avatar
slowbird slowbird is offline
Ultimate Warrior
 
Join Date: Jan 2001
Location: Montgomery, IL
Posts: 10,638
Default

Any idea where your current engine makes peak tq and hp?

  #19  
Old 05-03-2021, 12:41 PM
ta man ta man is offline
Ultimate Warrior
 
Join Date: Apr 2006
Location: Clinton,Ontario,Canada
Posts: 5,348
Default

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.

__________________

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  
Old 05-03-2021, 02:07 PM
Formulajones's Avatar
Formulajones Formulajones is online now
Ultimate Warrior
 
Join Date: Jan 2012
Posts: 10,794
Default

Quote:
Originally Posted by ta man View Post
After looking at my data from last years runs I found the Continental is slipping about 10 to 12 percent at the stripe. So first thing is to see how the Continental reacts to the gear change. The next step will be to put the UCC in that was built for 342 gears but slipped too much for 308's..it should flash to 3800 to 4000..I want to see what the data is on it so I can send it back if needed for a restall.
Wow that's a fair bit. I like how you're approaching it. Will be interesting to see how it affects both converters. Neat to see how quick the car really goes once all that is dialed in.

__________________
2019 Pontiac Heaven class winner

https://youtu.be/XqEydRRRwqE
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 07:30 PM.

 

About Us

The PY Online Forums is the largest online gathering of Pontiac enthusiasts anywhere in the world. Founded in 1991, it was also the first online forum for people to gather and talk about their Pontiacs. Since then, it has become the mecca of Pontiac technical data and knowledge that no other place can surpass.

 




Copyright © 2017