View Poll Results: After doing the drill mod, did you notice a difference in your high/any RPM shifting?
Voters: 108. You may not vote on this poll
Drill Mod Poll
Drill Mod Poll Hi guys,
If this poll was done before, I couldn't find it and I'm curious to see one, so here it is.
If you have done the drill mod, did you a) absolutely notice a difference, b) possibly notice a difference, or c) not notice a difference at all in your high RPM (or any RPM) shifting?
Comments, suggestions, etc, are all welcome!
If this poll was done before, I couldn't find it and I'm curious to see one, so here it is.
If you have done the drill mod, did you a) absolutely notice a difference, b) possibly notice a difference, or c) not notice a difference at all in your high RPM (or any RPM) shifting?
Comments, suggestions, etc, are all welcome!
you will notice a difference in clutch re-en engagement (it will release faster) but if you are grinding and have trouble getting into gear
you should look into a mcleod master cylinder.
it fixed my issues in that regard where the drill mod alone did not.
and if i had to do it over i would have drilled the line less than 1/8".
here is a link to a smokin` deal on a used one.
https://ls1tech.com/forums/lsx-parts-sale/775898-mcleod-adjustable-master.html
if grinding and gear engagement is your problem the drill mod alone may or may not be the best choice depending on your mods
and what issues you may or may not be having with shifting.
you should look into a mcleod master cylinder.
it fixed my issues in that regard where the drill mod alone did not.
and if i had to do it over i would have drilled the line less than 1/8".
here is a link to a smokin` deal on a used one.
https://ls1tech.com/forums/lsx-parts-sale/775898-mcleod-adjustable-master.html
if grinding and gear engagement is your problem the drill mod alone may or may not be the best choice depending on your mods
and what issues you may or may not be having with shifting.
Last edited by shoemike; Sep 2, 2007 at 04:01 PM.
Thanks for the posts. The results look pretty even at this point. Keep them coming!
Yeah, I have major troubles shifting (it's like it hits a wall between gears and causes me to miss shifts a LOT), but have replaced the clutch twice, replaced the slave cylinder, bled the clutch twice since the new one (two different ways), and rebuilt the tranny (after I lost the fourth gear synchros). I am still having the problem, so when I take it to get it tuned next week, I want to get the drill mod done and possibly replace the master. I was thinking about just getting the drill mod done and seeing if it helps, then if it doesn't, doing the master so I don't waste the money if it does.
Yeah, I have major troubles shifting (it's like it hits a wall between gears and causes me to miss shifts a LOT), but have replaced the clutch twice, replaced the slave cylinder, bled the clutch twice since the new one (two different ways), and rebuilt the tranny (after I lost the fourth gear synchros). I am still having the problem, so when I take it to get it tuned next week, I want to get the drill mod done and possibly replace the master. I was thinking about just getting the drill mod done and seeing if it helps, then if it doesn't, doing the master so I don't waste the money if it does.
I voted in the middle. I was experiencing tough shifting at high rpms and my pedal would loose all pressure after two shifts. I rebuilt my clutch master cylinder, made it adjustable, did the drill mod, new fluid, and bled it real good. It helped a little, but not as much as I would have hoped for. The pedal will still go soft after a couple high rpm shifts...though not as bad as before.
Jason
Jason
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Teching In
Joined: Feb 2005
Posts: 18
Likes: 0
From: Louisianna
Bad traffic and high heat toasted my master cylinder (02 Z28 42,000 miles)
I bled and flushed - mity vac'd - gravity but alas the MC was toast.
I was lucky enough tho cause when it finally completly bit the dust I was in front of Thunder Racing
Shane installed a mcleod master cylinder, 1/8 drill mod, and insulated the line for me that morning before the shop opened.
I voted center cause I believe the best improvement was from the mcleod master.
Shifting is always consistant now tho I think the trans it self could use some work to smooth the internal movement.
I bled and flushed - mity vac'd - gravity but alas the MC was toast.
I was lucky enough tho cause when it finally completly bit the dust I was in front of Thunder Racing
Shane installed a mcleod master cylinder, 1/8 drill mod, and insulated the line for me that morning before the shop opened.
I voted center cause I believe the best improvement was from the mcleod master.
Shifting is always consistant now tho I think the trans it self could use some work to smooth the internal movement.
I just replaced all of my hydraulics with my clutch change and haven't had an issue yet without the mod! The biggest difference that I've noticed has been changing my clutch fluid usually after every 1-2 nights out. When looking at it you wouldn't think that there is anything wrong. But put it in a clear plastice bottle and some new fluid in another and you'd be surprised how dark it is when you compare the two. A buddy of mine that suggested it said it worked great for him, so I thougt I'd try it. I know this probably would be feasable for most people that DD their cars.
Well so far it seems like the majority of people who do this notice some sort of difference, but it sounds like replacing the master cylinder and possibly replacing all the hydraulic lines should definitely be my next move after the drill mod. If I'm still having troubles after that, the only thing left would be to go with a brand new tranny instead of my rebuilt one. The issue was there before the rebuild, so it makes me wonder if something that wasn't replaced in the tranny is causing the problem.
TECH Resident
Joined: Oct 2005
Posts: 781
Likes: 0
From: Taxme, Ohio
I think you have it right.
I drilled the restriction out with a 7/64 drill. The pedal used to feel like it was a cold day and the fluid was thick. That doesn't happen now but I did miss 3rd gear at the track this week as was eliminated in the first round. I'm blaming it on the hydraulics.
The fluid was jet black when I did the drill modification. This tells me the rubber is breaking down and probably won't quit just because I flushed the system. I haven't inspected the fluid since the mod but by just looking at the translucent master it appears to be darkening.
I drilled the restriction out with a 7/64 drill. The pedal used to feel like it was a cold day and the fluid was thick. That doesn't happen now but I did miss 3rd gear at the track this week as was eliminated in the first round. I'm blaming it on the hydraulics.
The fluid was jet black when I did the drill modification. This tells me the rubber is breaking down and probably won't quit just because I flushed the system. I haven't inspected the fluid since the mod but by just looking at the translucent master it appears to be darkening.
I did the drill mod to my old master cylinder and I could tell a slight difference but it made more of a difference when I replaced the master cylinder with a new GM one. I had the Mcleod at one time also and it worked well but Im using a Textralia clutch and they only recomend GM hydraulics.
Originally Posted by PewterScreaminMach
Well so far it seems like the majority of people who do this notice some sort of difference, but it sounds like replacing the master cylinder and possibly replacing all the hydraulic lines should definitely be my next move after the drill mod. If I'm still having troubles after that, the only thing left would be to go with a brand new tranny instead of my rebuilt one. The issue was there before the rebuild, so it makes me wonder if something that wasn't replaced in the tranny is causing the problem.
it will cost you more but an adjustable is worth it.
the mcleod has a bigger piston than stock.
your problem is most likely that your master is not pushing enough fluid.
i thought i needed a new clutch (30,000 miles)
after i installed the mcleod it was all good.
i can`t guarantee it will fix what ails you but it is worth a try,
especially if you want to save some money over buying a new gear box
and still possibly having not solve the problem.
if the the problem was there before your rebuild ,
maybe you didn`t need a rebuild?
Originally Posted by shoemike
just don`t bother with a stock master for replacement.
it will cost you more but an adjustable is worth it.
the mcleod has a bigger piston than stock.
your problem is most likely that your master is not pushing enough fluid.
i thought i needed a new clutch (30,000 miles)
after i installed the mcleod it was all good.
i can`t guarantee it will fix what ails you but it is worth a try,
especially if you want to save some money over buying a new gear box
and still possibly having not solve the problem.
if the the problem was there before your rebuild ,
maybe you didn`t need a rebuild?
it will cost you more but an adjustable is worth it.
the mcleod has a bigger piston than stock.
your problem is most likely that your master is not pushing enough fluid.
i thought i needed a new clutch (30,000 miles)
after i installed the mcleod it was all good.
i can`t guarantee it will fix what ails you but it is worth a try,
especially if you want to save some money over buying a new gear box
and still possibly having not solve the problem.
if the the problem was there before your rebuild ,
maybe you didn`t need a rebuild?
I am hearing more recommendations to go with the stock GM master rather than an adjustable one, and from a lot of reliable sources, so I'm going to try that this Friday when I get the car tuned and the drill mod done. I'll let everyone know how it goes this coming weekend.
Originally Posted by PewterScreaminMach
The rebuild happened because I destroyed my 4th gear synchro and locked it in fourth.
I am hearing more recommendations to go with the stock GM master rather than an adjustable one, and from a lot of reliable sources, so I'm going to try that this Friday when I get the car tuned and the drill mod done. I'll let everyone know how it goes this coming weekend.
I am hearing more recommendations to go with the stock GM master rather than an adjustable one, and from a lot of reliable sources, so I'm going to try that this Friday when I get the car tuned and the drill mod done. I'll let everyone know how it goes this coming weekend.
but truthfully i don`t see why a stock master will help you but it`s your choice.
unless it is leaking there is probably nothing to gain by replacing it
with another stock piece.
good luck and have fun
Originally Posted by shoemike
oh.
but truthfully i don`t see why a stock master will help you but it`s your choice.
unless it is leaking there is probably nothing to gain by replacing it
with another stock piece.
good luck and have fun
but truthfully i don`t see why a stock master will help you but it`s your choice.
unless it is leaking there is probably nothing to gain by replacing it
with another stock piece.
good luck and have fun
. 
