4G54 Clutch upgrade

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d3v147
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4G54 Clutch upgrade

Post by d3v147 »

After my turbo conversion, I am having trouble with my 'Heavy Duty' RPM clutch not handling the power. It tends to slip in 3rd and 4th gear at about 4000 RPM and up. I am wondering if a Starion/Conquest clutch may fit, such as the one on ebay here:

http://www.ebay.com.au/itm/AUTOCOM-Stag ... 90e&_uhb=1

Also would this later allow for an RX7 gearbox upgrade? I have a feeling that once the clutch stops slipping I will have trouble with the rest of the drivetrain.

Also I am on the hunt for the holy B2600 bellhousing. It would be excellent if someone has one in tasmania.
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Sigmaproject
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Re: 4G54 Clutch upgrade

Post by Sigmaproject »

When I had the boost up a notch I was also getting clutch slip in 4th going up my favourite hill. Now that I am back to standard boost ..no more issues.
I have a stock pressure plate with 30% more clamping pressure + Starion turbo clutch plate.
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Sigmaproject
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Re: 4G54 Clutch upgrade

Post by Sigmaproject »

That looks like amazing value..even with posting from the US

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Superscan811
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Re: 4G54 Clutch upgrade

Post by Superscan811 »

Just be careful, the US Starions have 2 different sizes of clutches and pressure plates for their wide block 4G54's. I found out the hard way after purchasing 2 of them.

As for the gearbox, how much torque and where is it in the RPM range?

The Starion or Triton gearbox will be much stronger than either a BW or the Sigma/Scorp Jap 5 speed and will bolt straight on.

Depending on your budget NPC Clutches in Brisbane do a clutch/lightened flywheel package which will hold. (My brother's business makes the flywheels and their multi-plate clutches)

Here is the link to the specs.

Cheers.
Scorpma82
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Re: 4G54 Clutch upgrade

Post by Scorpma82 »

Does the Station/Triton g/box have the same ratios as the jap 5 speed in the Sigma????
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d3v147
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Re: 4G54 Clutch upgrade

Post by d3v147 »

Thanks for all the suggestions!

I'd love to figure out which year US G54Bs have compatible flywheels.

I think the problem I have been having is oil leaking into the clutch from the sump. Hopefully I can get that fixed and the clutch will recover/dry out.

It's easier for me to get an RX7 box than a Triton/Starion one. I just need to find the B2600 bellhousing!
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cheaterparts
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Re: 4G54 Clutch upgrade

Post by cheaterparts »

Scorpma82 wrote:Does the Station/Triton g/box have the same ratios as the jap 5 speed in the Sigma????
Starion and jap 5 speed have the same ratios but the staz has taper rollers on the lay shaft and wider gears to handle more torque
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d3v147
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Re: 4G54 Clutch upgrade

Post by d3v147 »

Getting closer the getting the Sigma back on the road and I remeber that last time I drove it I was playing with an EBC and the clutch was slipping up steep hills in 4th everywhere. I think I need to dive in and take the risk. With the two different type starion clutches, where is the difference? Is there a measurement I can get the seller to make? Could a little machining do away with the problem?
d3v147
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Re: 4G54 Clutch upgrade

Post by d3v147 »

I've done a little bit of research and there appear to be 2 different diameters and every other property is the same. The two diameters are

Disc Outer Diameter: 9 7/16" = 239.7125 millimeters
Disc Outer Diameter: 8 13/16" = 223.8375 millimeters

This is actually a triton 4g64 flywheel but it's the same
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So to cut a long story short, this is the one!

http://www.ebay.com.au/itm/AUTOCOM-Stag ... 53f18e79f5

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d3v147
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Re: 4G54 Clutch upgrade

Post by d3v147 »

Seller cancelled the order about 10 days after I made it. Was expecting to be receiving the item not a refund. If he let me know sooner I would definitely be a lot less pissed than I am now.

I'm looking at this http://www.ebay.com.au/itm/EXEDY-HEAVY- ... 106423872? as it is in Australia, but I'm scared I'm just going to end up with a slipping clutch all over again.
d3v147
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Re: 4G54 Clutch upgrade

Post by d3v147 »

NPC has quoted me $998 including GST for a flywheel and organic clutch. Apparently the use a 10" gtr sized clutch as the factory unit is just nowhere near large enough to work well without a button type clutch and horrible pedal feel. I think this is unfortunately a bit excessive for my budget at this point in time. (I don't think the motor even owes me that much!)
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