Which clutch for my HHR SS/TC?
06-12-2009, 12:49 PM
#1
Member
Thread Starter
Join Date: 04-09-08
Location: Seattle, WA
Posts: 377
Likes: 0
Received 0 Likes
on
0 Posts
Which clutch for my HHR SS/TC?
Well, my latest R&D tune is showing me I'll need a clutch upgrade. It won't hold full boost (about 30psi) in 3rd until about 4000 RPM and forget about it in 4th and 5th. LOL
So, any recommendations for a clutch upgrade? I know it's not a Cobalt SS/TC but I'm going to assume the clutch is the same for the HHR SS/TC.
Thanks
So, any recommendations for a clutch upgrade? I know it's not a Cobalt SS/TC but I'm going to assume the clutch is the same for the HHR SS/TC.
Thanks
06-12-2009, 12:54 PM
#3
Senior Member
iTrader: (3)
Join Date: 10-15-08
Location: florida
Posts: 2,637
Likes: 0
Received 0 Likes
on
0 Posts
Well, my latest R&D tune is showing me I'll need a clutch upgrade. It won't hold full boost (about 30psi) in 3rd until about 4000 RPM and forget about it in 4th and 5th. LOL
So, any recommendations for a clutch upgrade? I know it's not a Cobalt SS/TC but I'm going to assume the clutch is the same for the HHR SS/TC.
Thanks
So, any recommendations for a clutch upgrade? I know it's not a Cobalt SS/TC but I'm going to assume the clutch is the same for the HHR SS/TC.
Thanks
06-12-2009, 01:10 PM
#6
Member
Thread Starter
Join Date: 04-09-08
Location: Seattle, WA
Posts: 377
Likes: 0
Received 0 Likes
on
0 Posts
We have a custom OS tweak that defeated the 20psi boost limit in the tune (called the Infiniboost mod). Works on the Cobalt, too, but we're still testing to see what will happen with the turbo at that boost level
I don't have numbers yet because the clutch won't hold the power.
I don't have numbers yet because the clutch won't hold the power.
06-12-2009, 01:32 PM
#8
Member
Thread Starter
Join Date: 04-09-08
Location: Seattle, WA
Posts: 377
Likes: 0
Received 0 Likes
on
0 Posts
After our testing is complete, our customers will be able to get the upgrade as a "tune update"
There's other goodies we're working on also - like being able to switch between the "stage 1" tune (basically the GM Stage tune) and "stage 2" tune using the Competitive Mode selection for traction control
There's other goodies we're working on also - like being able to switch between the "stage 1" tune (basically the GM Stage tune) and "stage 2" tune using the Competitive Mode selection for traction control
06-12-2009, 01:36 PM
#11
Senior Member
Join Date: 08-06-06
Location: Clintwood, VA
Posts: 1,529
Likes: 0
Received 0 Likes
on
0 Posts
After our testing is complete, our customers will be able to get the upgrade as a "tune update"
There's other goodies we're working on also - like being able to switch between the "stage 1" tune (basically the GM Stage tune) and "stage 2" tune using the Competitive Mode selection for traction control
There's other goodies we're working on also - like being able to switch between the "stage 1" tune (basically the GM Stage tune) and "stage 2" tune using the Competitive Mode selection for traction control
And HB is right the exedy is probably the best clutch on the market right now for these setups.
06-12-2009, 01:37 PM
#12
Senior Member
iTrader: (7)
Join Date: 09-23-08
Location: Killeen,TX
Posts: 6,094
Likes: 0
Received 0 Likes
on
0 Posts
After our testing is complete, our customers will be able to get the upgrade as a "tune update"
There's other goodies we're working on also - like being able to switch between the "stage 1" tune (basically the GM Stage tune) and "stage 2" tune using the Competitive Mode selection for traction control
There's other goodies we're working on also - like being able to switch between the "stage 1" tune (basically the GM Stage tune) and "stage 2" tune using the Competitive Mode selection for traction control
06-12-2009, 01:39 PM
#14
Senior Member
Join Date: 08-06-06
Location: Clintwood, VA
Posts: 1,529
Likes: 0
Received 0 Likes
on
0 Posts
06-12-2009, 01:46 PM
#15
Member
Thread Starter
Join Date: 04-09-08
Location: Seattle, WA
Posts: 377
Likes: 0
Received 0 Likes
on
0 Posts
We have the 2009 HHR SS/TC stage tune from GM now, so that'll be "stage 1" - it'll be the same setup for the Cobalt. They rated the tune at, what, 290HP at the crank? It's an upgrade over stock but not totally crazy.
"Stage 2" will be whatever we end up with on our car. I'm expecting at least 20HP over what we get now - on our car, in 3rd, its 20psi up until about 4000 RPM, then it jumps to the max psi, and you can feel the difference in power. It wants to torque-steer bad at 50+ MPH.
I want to put some miles on the tune first - if we learn the stock turbo can't take this level of power for very long it won't make much sense to sell the tune as an upgrade. But, so far, so good. Tune upgrades are going for $75 + shipping right now, but people that own the EZ Flash cable will probably get it for less.
Stock turbo is holding up just fine. There is a big difference in pull when it jumps from 20psi to max boost. It's absolutely nuts. I wish I had a clutch that would take full power now
"Stage 2" will be whatever we end up with on our car. I'm expecting at least 20HP over what we get now - on our car, in 3rd, its 20psi up until about 4000 RPM, then it jumps to the max psi, and you can feel the difference in power. It wants to torque-steer bad at 50+ MPH.
Stock turbo is holding up just fine. There is a big difference in pull when it jumps from 20psi to max boost. It's absolutely nuts. I wish I had a clutch that would take full power now
06-12-2009, 01:56 PM
#17
Senior Member
We have a custom OS tweak that defeated the 20psi boost limit in the tune (called the Infiniboost mod). Works on the Cobalt, too, but we're still testing to see what will happen with the turbo at that boost level
I don't have numbers yet because the clutch won't hold the power.
I don't have numbers yet because the clutch won't hold the power.
06-12-2009, 01:57 PM
#18
We have a custom OS tweak that defeated the 20psi boost limit in the tune (called the Infiniboost mod). Works on the Cobalt, too, but we're still testing to see what will happen with the turbo at that boost level
I don't have numbers yet because the clutch won't hold the power.
I don't have numbers yet because the clutch won't hold the power.
After our testing is complete, our customers will be able to get the upgrade as a "tune update"
There's other goodies we're working on also - like being able to switch between the "stage 1" tune (basically the GM Stage tune) and "stage 2" tune using the Competitive Mode selection for traction control
There's other goodies we're working on also - like being able to switch between the "stage 1" tune (basically the GM Stage tune) and "stage 2" tune using the Competitive Mode selection for traction control
Is this a post-Stage Kit add-on?The clutch... it just... can't... hold... the powa!
06-12-2009, 02:02 PM
#21
Senior Member
06-12-2009, 02:02 PM
#22
Banned
Join Date: 08-22-08
Location: America
Posts: 354
Likes: 0
Received 0 Likes
on
0 Posts
I think i got to be a guinea pig for a lot of this.
Intercooler and 3' catback are holding me back right now.
Plus, it's really awesome being able to use an in-car boost controller.
Vince is the man!
06-12-2009, 02:08 PM
#25
Member
Thread Starter
Join Date: 04-09-08
Location: Seattle, WA
Posts: 377
Likes: 0
Received 0 Likes
on
0 Posts
That is cool except the stock turbo is way out of it efficiency range at above 23 psi if you look at the compressor map for the stock turbo there is a very small efficiency island at pressures above 23 psi. It can handle up to 30 psi in the midrange but will fall off really hard up top. Look at ZZP car with their map clamps a MBC and ported head it made 410 wtrq on the stock turbo but could muster only a 12.97 at 110 mph IIRC. It is a cool mod though if you are looking to upgrade the turbo for one designed to run those pressures.
Ah ha! I wondered if you were on the forums. ;-) Yes, mr_buddha and CJ deserve a ton of credit for helping test this - hours and hours of datalogging and testing. Lol
Last edited by VinceTrifecta; 06-12-2009 at 02:08 PM. Reason: Automerged Doublepost