c130aviator

iTrader: (8)

I have come across several parts as I craigslist and shop online and these are three of the clutches I have on hand and just some impressions. I have actually only ran the stock one thus far but even stock had not slipped on me since turbo'd. I must have got a Wednesday made one.


Stock clutch and pressure plate (I personally was making over 300hp for a short time with no issues on a turbo LSJ)





GMPP Upgraded LSJ c&pp (rated at 300hp but no tq given) 250 internet price, free trade





SPEC 2+ c&pp (rated to 440 lb-ft of torque, but has slipped in some cars with less power) 550 internet price, I paid 200 on Craigslist.





LNF TOB made in the Czech Republic? is an upgrade over the LSJ version



LSJ Tube, Pressure Plate bolts, fly wheel bolts all should be replaced during install.



Stock Flywheel ( I am reusing it, its surface still maintains the ridges compared to a new one) a lighter version can be purchased but the weight can affect drive-ability drastically when lighter than stock fly wheels are used.

c130aviator

iTrader: (8)

it appears that spec 2+ uses the stock pressure plate, they are identical.

mrbelvedere

iTrader: (3)

it may look the same but the relase point and the spring pressure may be more

Dart_SI

iTrader: (1)

i have a gmpp in my LNF....

love it.

its probably no stronger than a stock LNF clutch because my stock clutch didnt slip till i blew the trans.

c130aviator

iTrader: (8)

i don't believe so, i have them both sitting right here and they are the same. The disc material is what provides more grip, not the clutch pressure plate necessarily. The GMPP pressure plate is "softer" than the stock and spec2+ so i don't figure the Pressure plate is making less force to hold the clutch to the flywheel, otherwise the gmpp would be less capable of tq (not sure why they used a 300 hp number to rate it, tq is what matters here).

I think there is a compromise between pressure plate and clutch material; whereas the stocker and spec use a heavier pressure but compensate drive-ability with the clutch material and the newer gmpp uses a lighter pressure plate but uses a grippier material.

Also the spec clutch discs are thicker than the stock and gmpp, so with the same spring pressure from the pressure plate the spec will hold tighter since its under the load of the spring due to thickness alone, then there is the material that spec uses that would create more friction.

What it all comes down to is the evidence i have here that SPEC uses a stock pressure plate painted blue.

*EDIT, this is all speculation, what I am saying is just an observation.

What kind of power are you making?

Dart_SI

iTrader: (1)

No idea. Probably around the 360/380 range depending on boost level. Tq is about the same or more.

c130aviator

iTrader: (8)

well i have been going back and forth on the clutch. I think I am going to run the spec clutch but everyone seems happy with the gmpp. Its just that I am going to attempt to put down 400+ hp/tq. Wish some spec 2+ guys would chime in.

mrbelvedere

iTrader: (3)

you do not know if the spec uses a stock plate or not looks can be decieving and the gmpp has more pedal load then a stock plate so it most definalty has a stiffer plate then stock

07LSJ

iTrader: (5)

are you going to sell the gmpp? if you are, id be interested in it depending how many miles on it.

c130aviator

iTrader: (8)

gmpp and SPEC are new in the box. these are parts I have had laying around for a while while I have been building the engine. Not sure which would make a better daily driver. I want to use the SPEC cause of the better power handling. Going to hold onto them for now.

Bass_Waves

iTrader: (24)

holy crap, your truly building the living **** outta that lsj huh

c130aviator

iTrader: (8)

if I could ever get a block to ship without cracking in the mail. Someday, yes.

c130aviator

iTrader: (8)

Just doing some garage putzing and found this! PROOF that the Spec 2+ uses a stock GM/Saab pressure plate.

The Spec has ground down the stamp that is on the stocker by my finger and painted it blue to help hide it but its very apparent. Then on the opposite the same place has a SPEC emblem covering another area where its ground down and the model is located. I inspected both but there is no doubt that SPEC uses the LuK pressure plate, same as GM.

Omnigear

iTrader: (4)

My spec2+ gave out on me

c130aviator

iTrader: (8)

where did it fail and under what load? what kind of power you making? cause I still have this gmpp sitting here ready for duty.

c130aviator

iTrader: (8)

If you are talking about the TOB going out that is not spec's fault. I am using and lnf, clutch tube, etc so its all oem. There are no reports of SPEC problems just people that dont bleed their brakes properly or do a bench bleed.

Omnigear

iTrader: (4)

Didnt Really fail,
Had tvs 2.9, 80s, e85, exhaust N pushing 300s low
It just slips 4500+ on 2nd n 3rd pulls

c130aviator

iTrader: (8)

good to know, only way i will know is to run it i guess. Hope it holds up for at least a year...

Powell Race Parts

iTrader: (3)

you cant bench bleed a tob in a trans out of the car, there is no one way valve in the hydraulic system, no way to do it. all you can do is run brake fluid into it, for whatever good that does. But you are correct, all these TOB failures appear to come down to incredibly bad installs and really crazy clutch bleeding...I have never had a TOB fail on an new F35 clutch install on deltas since 2004.

Powell Race Parts

iTrader: (3)

true. sachs is good . Luk depends on your luck. stock LSJ was not lucky it was a crummy week clutch pressure plate.

sachs. all u need.

Powell Race Parts

iTrader: (3)

PS I am not confident that Saab used a Luk pressure plate, but for sure the experience with the LSJ says GM wished they had not, they went cheap and for the LNF they switched to sachs.The story goes ( I got some inside info lol) Exedy did the OEM clutch for the Cavvy f23 and GM asked them to bail out the LSJ just as they were going into production and Exedy told GM to take a hike.

BLAZIN07SS

iTrader: (7)

I have never gotten my gmpp to slip on 25.5psi from the s256 and e85. It defies logic but its an incredible clutch. Unbelievable that its so cheap

574

iTrader: (5)

Good to hear, I just ordered mine about 2 minutes ago

Powell Race Parts

iTrader: (3)

x2 ^^^^. I switched transmissions this summer ( and motor lol) and the GMPP after 40k miles was like brand new. 300+ whp and road racing.

of course the driver is very very good.
but its an awesome value.

c130aviator

iTrader: (8)

so what I am hearing is that you guys think i should run the sachs/gmpp/saab setup with the fancier non stock pressure plate. Especially with you all running the big turbo from zzp and E. Think I will run it then when I get my block back.