NB8B 6speed "feel"

aviper4u · Postby **aviper4u** » Sat Jul 23, 2011 8:42 pm

Hello there,

This probably wont make sense though, here goes.

Has anyone been changing gears and doesn't want to rush it in too quick to avoid that click noise so when shifting the gear and it's just about to go in, it kinda feels like the lever pulsates 2-3 times then gear goes in smoothly and quietly? This doesn't happen every time and mainly 3rd and rarely 2nd.

Got me thinking as 2nd and 3rd are the most notchy gears when cold so maybe something happening?

anyways thanks for insight

Apu · Postby **Apu** » Sat Jul 23, 2011 10:02 pm

I dud find my gears notchy when cold but the guys at Mania suggested I switch to Redline, and it's been much better even on freezing mornings!

rhythmstick · Postby **rhythmstick** » Sat Jul 23, 2011 10:09 pm

I've been wanting to switch to Redline for a while. You using MT90?
How much do you need to use for a full oil replacement? I only ask as it comes in two bottle sizes. One sounds too little, the other sounds too much lol.

aviper4u · Postby **aviper4u** » Sat Jul 23, 2011 10:19 pm

rhythmstick wrote:I've been wanting to switch to Redline for a while. You using MT90?
How much do you need to use for a full oil replacement? I only ask as it comes in two bottle sizes. One sounds too little, the other sounds too much lol.

6 speed should 1.8L

I did change to Nulon 75-90 fully synthetic and the cold changed considerably though just wanted to see if other had felt the same thing

Locutus · Postby **Locutus** » Sat Jul 23, 2011 10:27 pm

yep 2L of oil for 5sp, 1.8L for 6sp.

i've been wanting to switch to either redline or royal purple oil... redline seems to have a good rep on here.
i'm running castrol syntrax which seems to have turned to jelly this winter.

aye viper, give me a shout if you are keen on getting both cars in the air for a dual gear oil change. should be a hair under $50 each if we split a 4qt bottle, which should be enough.

rhythmstick · Postby **rhythmstick** » Sat Jul 23, 2011 10:30 pm

Pity it doesn't spilt between three. lol

Apu · Postby **Apu** » Sun Jul 24, 2011 6:08 am

Go the Redline guys! The difference it made was significant - i used to have to baby it until everything warmed up otherwise I crunch and stick, but nie I just get in and go.

Mr Morlock · Postby **Mr Morlock** » Sun Jul 24, 2011 9:17 pm

so how come many of us have no problem at all with gear changes on 6 spd without needing to use Redline?

rhythmstick · Postby **rhythmstick** » Sun Jul 24, 2011 9:25 pm

It's possible that Mazda changed the type of oil it used between productions, or there were differences in the production of the gearboxes themselves.
Or that the people do have the problem, but don't know any better.

Postby **NitroDann** » Sun Jul 24, 2011 9:39 pm

Mine has the standard cold secong gear click.

How about we do this to get a good idea on oils....?

Oil: Castrol manual syntrax 75w90
Cost of oil: $70 for 2x1L bottles at repco
Cold- Crunches into: 2nd only, clicks when you snap it in fast
Hot- Crunches into: None
KM on gearbox : <100,000
Abuse: regular 1st, 2nd, 3rd, and 4th clutch dumps and kicks at or near the limiter.

Hows that to get some data easily?

Dann

Apu · Postby **Apu** » Sun Jul 24, 2011 10:28 pm

Mr Morlock wrote:so how come many of us have no problem at all with gear changes on 6 spd without needing to use Redline?

Because...the synchros may be more worn?

Postby **NitroDann** » Sun Jul 24, 2011 10:42 pm

Not just synchros but small manufacturing or shiming differences will do it.

Dann

Postby **Okibi** » Mon Jul 25, 2011 1:20 am

It's also the speed you're shifting and the amount of torque/rpms while you shift obviously.

Postby **NitroDann** » Mon Jul 25, 2011 1:33 am

When you shift, the clutch is in, zero torque. The issue apart from the actual box internals is like you said rpm, but also its the amount your motor mounts move as the clutch goes in and the engine/box twists back straight.

Dann

jerrah · Postby **jerrah** » Mon Jul 25, 2011 10:02 am

My 6 speed is super stiff in 1st and 2nd for the first minute on a cold morning then is slick. By the time I've made it around the corner it's good to go.
In summer it's good straight away.

Castrol MT90.