RE: 13's at last!

["Earl H. " <earlh@xxxxxxxxxxxxxx>]

Don,

I feel the most important part of the shift decision is the gear split 
or the RPM drop resulting from that split. If the split is so large it 
drops the RPM range below the Max Torque point, it will cost you 
ET. With a 3 speed trans, like a 727, you might find you need a 
different shift point for 1 to 2 than you need from 2 to 3 based 
on RPM drop and peak torque RPM's. Without having had your 
engine on a Dyno, or your car on a chassis Dyno, it has to be done 
via experimentation. If your split is so large your dropping below 
the max torque RPM, you could go faster by shifting at a higher 
rpm for that gear. Converse to that, short shifting could be a benefit 
if the split is small enough that your coming in to the next gear 
way above the torque curve. It takes lots of runs and experimentation 
to get it just right.

Earl


I just read somewhere in the last couple of weeks that you should shift 
10% over HP peak.  In your case this would be 6600.  Since you allow 500 
for shift reaction time, this becomes 6100.  (Wouldn't mind hearing some 
opinions on those statements).

       Akron Don

Robert (UK) wrote:
> Douglas
>
> We had the engine dyno'd and it peaked around 6000 (havent got the info 
> to hand to be 100% sure of the exact rpm) so, after reading recently 
> that someone else with a similar set-up was shifting 500rpm early to 
> allow for the delay thru the push buttons to the trans, I thought I'd 
> try the same.
> I did notice a delay between pushing the buttons and the trans changing 
> up, but didnt notice exactly whether the delay was actually 500rpm.
> To get the most out of what we have, I know we need to know what rpm to 
> shift at, and to be sure we hit that rpm, but that was the theory behind 
> changing at 5500!
>
> Robert
> 63 Polara 500
> England
>
> Douglas J wrote:
>   
>> Robert, 
>> Is it "done" at 5500, or are you protecting your investment?  I cant say 
>> for sure, as it's been more than a few years, but I'm pretty sure I 
>> turned mine harder than that.  I did have a bit more cam than stock.  I 
>> think the only big block I've shifted out at 5500 was a bone stock 383.  
>>  I wonder what Don D. turns on his?  Still, I wish my '63 could run a 13 
>> !!
>>     
>
>
> ----
> Please address private mail -- mail of interest to only one person --
directly to that person.  I.e., send parts/car transactions and negotiations
as well as other personal messages only to the intended recipient, not to
the Clubhouse public address. This practice will protect your privacy,
reduce the total volume of mail and fine tune the content signal to Mopar
topic.  Thanks!
>
> '62 to '65 Mopar Clubhouse Discussion Guidelines:
> http://www.1962to1965mopar.ornocar.org/mletiq.html. 
>
>
>   


----
Please address private mail -- mail of interest to only one person --
directly to that person.  I.e., send parts/car transactions and negotiations
as well as other personal messages only to the intended recipient, not to
the Clubhouse public address. This practice will protect your privacy,
reduce the total volume of mail and fine tune the content signal to Mopar
topic.  Thanks!

'62 to '65 Mopar Clubhouse Discussion Guidelines:
http://www.1962to1965mopar.ornocar.org/mletiq.html. 


----
Please address private mail -- mail of interest to only one person -- directly to that person.  I.e., send parts/car transactions and negotiations as well as other personal messages only to the intended recipient, not to the Clubhouse public address. This practice will protect your privacy, reduce the total volume of mail and fine tune the content signal to Mopar topic.  Thanks!

'62 to '65 Mopar Clubhouse Discussion Guidelines:
http://www.1962to1965mopar.ornocar.org/mletiq.html.