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| TPI SBC refresh with G6 6 speed trany upgrade (Page 12/16) |
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Jake_Dragon
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SEP 12, 01:38 PM
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| quote | Originally posted by Alex4mula:
Well... the SPEC 6 speed clutch failed at exactly 2700 miles even.  It started to shift harder and harder and now it is very difficult to get into 1st. It shift fine with the engine shut off. Also it was (and is) vibrating so something is not round anymore inside there  The pedal feels perfect so it is not hydraulic. This hydraulic slave is a beauty. This clutch never grabbed well since the begining so I'll see if I can get something better to hold the massive torque. Will keep you posted. |
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Was that a SPEC 3 +
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Zac88GT
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SEP 12, 03:09 PM
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let us know when you find out what failed. i'm still trying to decide whether or not to go with a solid hub for my 6 speed swap.
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Alex4mula
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SEP 12, 07:33 PM
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Jake; Not sure what type it is but it is closer in appearance to it as the stage 3 is a six puck design and this is not. I talked to SPEC today and they want me to send the unit and flywheel for inspection. They assure me it should hold ok the troque I have and that I should not need a solid hub. Will see. I'll try to take it down this weekend and post pictures of what I find.
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Joseph Upson
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SEP 12, 08:37 PM
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| quote | Originally posted by Alex4mula:
Well... the SPEC 6 speed clutch failed at exactly 2700 miles even. It started to shift harder and harder and now it is very difficult to get into 1st. It shift fine with the engine shut off. Also it was (and is) vibrating so something is not round anymore inside there The pedal feels perfect so it is not hydraulic. This hydraulic slave is a beauty. This clutch never grabbed well since the begining so I'll see if I can get something better to hold the massive torque. Will keep you posted. |
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Interesting, there is another resent post regarding a low mileage Spec clutch failure accompanied by some vibration. I wonder if they are using their own hub design or a pre existing hub from another application that fits the 6 spd splines. Centerforce didn't get very good press on the forum which is part of the reason Spec became so popular, but with what I have read here about Spec experiences over the past year I would continue to favor custom rebuilds before purchasing one since I was able to talk to the builder face to face about what I was doing and what the needs would be, I also had several choices. The dual friction disc I had made performed flawlessly so I used the same guys for the 6 spd disc.
If I were in your situation and Spec confirmed a defect in product (provided you have the option) I would request a refund and have it custom built locally. I was quoted about $180 for a new Kevlar disc but decided to have them rebuild the old disc to save time. The builder stated that Kevlar would last a very long time. They are also able to increase pressure plate clamping pressure also. Again this is due to the number of problems that seem to be cropping up with Spec lately.
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Alex4mula
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SEP 13, 09:25 AM
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| quote | Originally posted by Joseph Upson:
Interesting, there is another resent post regarding a low mileage Spec clutch failure accompanied by some vibration. I wonder if they are using their own hub design or a pre existing hub from another application that fits the 6 spd splines. Centerforce didn't get very good press on the forum which is part of the reason Spec became so popular, but with what I have read here about Spec experiences over the past year I would continue to favor custom rebuilds before purchasing one since I was able to talk to the builder face to face about what I was doing and what the needs would be, I also had several choices. The dual friction disc I had made performed flawlessly so I used the same guys for the 6 spd disc.
If I were in your situation and Spec confirmed a defect in product (provided you have the option) I would request a refund and have it custom built locally. I was quoted about $180 for a new Kevlar disc but decided to have them rebuild the old disc to save time. The builder stated that Kevlar would last a very long time. They are also able to increase pressure plate clamping pressure also. Again this is due to the number of problems that seem to be cropping up with Spec lately.
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I had a custom build one on my previous V8. It worked excellent and never slipped but at about 5K miles a disc spring broke. When I compared its construction to the Spec I had I found that the Spec used much thicker metal in the tab that broke so it was obvious Spec had better construction.
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Joseph Upson
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SEP 15, 06:49 AM
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| quote | Originally posted by Alex4mula:
I had a custom build one on my previous V8. It worked excellent and never slipped but at about 5K miles a disc spring broke. When I compared its construction to the Spec I had I found that the Spec used much thicker metal in the tab that broke so it was obvious Spec had better construction. |
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There are several options when going with a custom built clutch and it is only as good as the builders materials and knowledge of the requirements and if you are working with someone who starts out trying to build a stronger clutch for a larger displacement engine with considerable more power using the stock Fiero clutch as a base then they are starting out wrong from the begining.
The builder I used immediately pointed out stronger areas of the G6 disc relative to other discs indicating he was aware of critical failure points. He also gave me the option to use a solid hub since the G6 flywheel contains the majority of the dampening effect. Your custom clutch still lasted nearly twice as long as his Spec clutch so there's not much of a mark against custom, maybe they both made the same mistake. Sometimes I wonder how much actual testing even if it's just crunching data on the materials strength goes into a manufacturers claims.
I had a rep dealing with exhaust tubing tell me stainless was much better than cast iron for a turbo application and that cast iron couldn't take the heat. He didn't know the melting point of iron is higher than for stainless and certainly "dropped the ball" by not being mindful that nearly all production turbo cars come with cast iron manifolds before making that statement.
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Will
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SEP 15, 09:39 PM
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| quote | Originally posted by Alex4mula:
and CAI |
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Great power out of a TPI.
Get a Vortec 350 front cover & crank sensor, have a custom wheel made for that sensor which will give you the same reference pulse shape & pattern as the distributor, ditch the HEI for an MSD dist plug w/ cam synch and use LS1 coils with FAST eDist.
Once you've done all that, you can turn the TPI plenum around (or buy an HSR and install with plenum reversed).
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Alex4mula
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SEP 19, 09:16 PM
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I created a separate clutch failure thread here;
http://www.fiero.nl/forum/Forum2/HTML/086132.html
I'm happy to see that the water diverter I installed did its job and the front header has kept dry. No cracks yet. But the coating is flaking in that area. What a crap. Don't buy the Sandersons for your V8 build... Also the valve cover gasket started to leak. I used the Felpro pn# cork type that AFR recommended but I'll go now with something different.
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CTFieroGT87
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SEP 19, 09:58 PM
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Yup, that header's days are numbered.... again. You'd laugh if you saw the weld job I had done to keep my set of headers together for the time being. That center collector is built up a good inch or so. Looks weird as heck, but its gonna keep em together for a while.
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Alex4mula
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OCT 25, 02:48 PM
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Now that I solved my clutch issue I'm working on something I wanted to do for a long time. I'm installing a 4" intake routed to the fender. Here is my progress with a test panel. I installed it to see which type & size of scoop I needed. I'm thinking maybe I do a removable scoop using those race car type panel fasteners. That way it makes it easier to install the filter. My water pump is behind so that is why it sticks out. Also the filter is big.
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