belize1334
Well-known member
I'm trying to build my car to be a cleaner-uppper in autocross under "D Street Prepared." The next thing on the list is a rebuilt transmission with synchros that actually work...
Now, strictly speaking I am not allowed ANY modifications to the transmission with the exception of the differentials which I'm free to play with. But, I'm happy to "turn a blind eye" to anything that will make my vehicle last longer so long as it doesn't actually make it faster in any given run. So, for instance, an updated 3/4 fork won't make me any faster but it is less likely to break which means I won't have to buy another transmission. This is my general philosophy... I'll bend the rules so long as the end result makes me more reliable (and thus less expensive in the long run) but not if it can be construed as a "performance benefit" with implications toward my actual speed on the course.
Ok, so what about synchros? Most transmission rebuilds offer double-synchro 2nd as a standard element and then a double-synchro 1st if you want it. This supposedly allows for 10k rpm shifts (applicable to drag racing) as well as promoting the life of the synchro assembly. Well, longer lasting synchros sound GREAT. If my next transmission lasts a decade and the synchros never give out I'll be a happy camper. But what about the "on course performance" of a double ring synchro assembly? If I remain in the 3-7k rpm range, will I "notice" the difference from a double synchro setup? If it makes the shifts faster by 1/10th of a second it could well add up and make the whole run faster. Probably nobody would notice... but I'm trying to be honest here. I'd feel bad if I won something knowing that I had cheated in a way that contributed to my victory...
So, that's all by way of saying... for those with double synchro gearsets, can you tell the difference in "normal" rpm situations? Does it shift smoother and faster or is it just longer lasting with implications in the extreme rpm range?
Now, strictly speaking I am not allowed ANY modifications to the transmission with the exception of the differentials which I'm free to play with. But, I'm happy to "turn a blind eye" to anything that will make my vehicle last longer so long as it doesn't actually make it faster in any given run. So, for instance, an updated 3/4 fork won't make me any faster but it is less likely to break which means I won't have to buy another transmission. This is my general philosophy... I'll bend the rules so long as the end result makes me more reliable (and thus less expensive in the long run) but not if it can be construed as a "performance benefit" with implications toward my actual speed on the course.
Ok, so what about synchros? Most transmission rebuilds offer double-synchro 2nd as a standard element and then a double-synchro 1st if you want it. This supposedly allows for 10k rpm shifts (applicable to drag racing) as well as promoting the life of the synchro assembly. Well, longer lasting synchros sound GREAT. If my next transmission lasts a decade and the synchros never give out I'll be a happy camper. But what about the "on course performance" of a double ring synchro assembly? If I remain in the 3-7k rpm range, will I "notice" the difference from a double synchro setup? If it makes the shifts faster by 1/10th of a second it could well add up and make the whole run faster. Probably nobody would notice... but I'm trying to be honest here. I'd feel bad if I won something knowing that I had cheated in a way that contributed to my victory...
So, that's all by way of saying... for those with double synchro gearsets, can you tell the difference in "normal" rpm situations? Does it shift smoother and faster or is it just longer lasting with implications in the extreme rpm range?