i have all the same mods but now i just got a longer 4th from shepherd, because i have the cosworth 272s that im gonna put in about a month or so when i get more money, but the best was a 12.911 @ 103.5 with a 1.9 60ft but i was wondering why my trap speed is so low, is it because of the 4th gear because when i had the stock 4th the trap was around 107 with a 13.1 and a 1.9 60 but i dunno, the temp was about 90 and it was really humid. do you guys think that the 4th was what slowed me down or just bad weather

 

I hope you didn't change out your trans just for extending 4th gear. It was because you damaged the stock trans, right? You still won't be near needing a longer 4th gear even after the cams.

Anyway, you improved the ET without improving your power or 60', so I don't think the trap speed is an issue. Both the ET and trap suck donkey *****, but you appear to be on a stock cat, a very restrictive cat-back, and no tune.

 

heh donkey *****.

 

yea the stock tranny had a lot of problems, the shep one is wery nice, i never miss now

 

Longer forth means car is driving up hill compared to old forth. Results are as expected. mitsubishi does a lot of research on correct ratios for the powerband. Why would you change that??????

 

when u get to a 115 trap its going to start helping you. Right now its a good upgrade for the future, if thats your plan.

 

thats the plan when i get the money.
.

 

I need that tranny haha! I trap at 117mph on the stock evo IX 4th gear right now @ 7900 rpm or so.

 

it is very easy to shift, i love it because i never miss anymore and the 4th goes to about 120 at around 7800 so that would help you

 

https://www.evolutionm.net/forums/sh...d.php?t=254995

 

i should have read this thread a month ago

 

you could also go with a little taller tire. ex: 255/40/17

 

the aboved mention tire is actually not as tall as the stock 235-45-17
http://www.miata.net/garage/tirecalc.html

 

Yeah, why did you think 255/40 was taller?

 

when is a longer 4th gear needed or best too do??

my stock trans i trap 116mph on stock turbo.

i now have a bigger turbo so would it be a good idea to do a longer 4th or no??