Any 9 sec stick cars here? Launch Vid.

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six
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Post by six » Thu May 10, 2007 2:54 am

I want to meet your wife.
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Post by dklkse » Thu May 10, 2007 9:45 am

Sypher wrote:I think our in-house pro race driver may be able to shine some light on this....

paging Mr. Sheehan ...[fuzz]... Mr. Sheehan to the front desk please.....[fuuuuuuzzz]....
Good idea. He may have some knowledge on this. Although.. I think he might have become sick of the drama by now, since he got caught up in it a few times.. Haven't seen him much lately.

sc68z28 wrote:I can keep you posted if your interested?
We would like that very much. 8)
hockeystyx16 wrote:they got ABS placebo all up their ass making them feel safe and warm

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Post by GarySheehan » Thu May 10, 2007 2:09 pm

I am by no means a drag expert, so don't know if any of this will make sense.

Are you using a hydraulic or cable operated clutch? If hydraulic, is there any type of fluid flow limiter that might slow the clutch down so it takes a little longer to get to full clamping force? Or if cable operated, some type of return damper? Something that's tunable so you can dial it in. This might help soften the bite off the launch, but I'm guessing could be pad for later shifts down-track.

Are there stickier tires that you could use in your current class?

Other than that, I'm guessing that's why so few drag guys are using full manual transmissions. What you're trying to do is pretty difficult. If you convert that thing to AWD, it would get you off the line harder ;)

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Post by eaglecatcher » Thu May 10, 2007 6:34 pm

GarySheehan wrote:I am by no means a drag expert, so don't know if any of this will make sense.

Are you using a hydraulic or cable operated clutch? If hydraulic, is there any type of fluid flow limiter that might slow the clutch down so it takes a little longer to get to full clamping force? Or if cable operated, some type of return damper? Something that's tunable so you can dial it in. This might help soften the bite off the launch, but I'm guessing could be pad for later shifts down-track.

Are there stickier tires that you could use in your current class?

Other than that, I'm guessing that's why so few drag guys are using full manual transmissions. What you're trying to do is pretty difficult. If you convert that thing to AWD, it would get you off the line harder ;)
as long as you don't snap an axle. haha
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Post by sc68z28 » Thu May 10, 2007 10:13 pm

GarySheehan wrote: If hydraulic, is there any type of fluid flow limiter that might slow the clutch down so it takes a little longer to get to full clamping force? Or if cable operated, some type of return damper? Something that's tunable so you can dial it in. This might help soften the bite off the launch,
Are there stickier tires that you could use in your current class?
Thanks for your reply Gary, my linkage is all mechanical, but your on the right track. What a good drag clutch does is slip a little, takes the shock out of the initial hit and after gear changes. Mcleod makes one called Soft-lock, but its kind of a one size fits all, works for some people. I've heard adjusting one from scratch can be a daunting task. At roughly $1800, if you miss on the adjust and burn it, you get to start all over :x .

The clutch I just got, comes with a base set up. It's taylored to my cars weight, HP, TQ, launch RPM, and shift RPM. It should be tight but close, then I'll just try and sneek up on just enough slip.

Traction without the slip did this :cry: and a few other things more than once.
Image

Thanks again ---Bill.
1968 Camaro G-force 5 speed
9.20 vid http://www.youtube.com/watch?v=7eiVf6StIFE

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Post by eaglecatcher » Mon Jun 04, 2007 1:14 am

I've got an idea...

get wider rubber!
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Re: Any 9 sec stick cars here? Launch Vid.

Post by jaydubb » Wed Aug 01, 2007 6:57 am

sc68z28 wrote:Just wondering if anybody has figured out what kind of clutch it takes to get in the 9's. I'm stuck at low 10 sec passes, and always breaking stuff :(
This 1/8 mile Vidio, http://www.youtube.com/watch?v=Uk_pWioiI3s
shows me launching with a 2 disc Mcleod street twin, seem to hit way to hard.
There is slo motion at the end, with to much wheel spin :(
Is anyone using a soft-loc or similar clutch in there street/strip car with any sucsess?

Thanks ---Bill.
I was gonna suggest a Mcleod Street Twin until I read all the way through your post...

Call Mcleod and see what they recommend. What RPM are you leavng at? What have you broken so far? What tranny? You might also want to try RAM clutch.
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Post by jaydubb » Wed Aug 01, 2007 7:01 am

sc68z28 wrote:
GarySheehan wrote: Traction without the slip did this :cry: and a few other things more than once.
Image

Thanks again ---Bill.
Strange aluminum 9-inch center section w/ 12-bolt gears??? I havent seen anyone have much success with that unless it was a rail/dragster.

What else has broken?
2002 Maxima SE 6-speed 3.5 V-6
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1991 Camaro RS 5 speed 5.0 V8
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Post by comingbackdown » Wed Aug 01, 2007 9:58 am

sc68z28 wrote:
GarySheehan wrote: If hydraulic, is there any type of fluid flow limiter that might slow the clutch down so it takes a little longer to get to full clamping force? Or if cable operated, some type of return damper? Something that's tunable so you can dial it in. This might help soften the bite off the launch,
Are there stickier tires that you could use in your current class?
Thanks for your reply Gary, my linkage is all mechanical, but your on the right track. What a good drag clutch does is slip a little, takes the shock out of the initial hit and after gear changes. Mcleod makes one called Soft-lock, but its kind of a one size fits all, works for some people. I've heard adjusting one from scratch can be a daunting task. At roughly $1800, if you miss on the adjust and burn it, you get to start all over :x .

The clutch I just got, comes with a base set up. It's taylored to my cars weight, HP, TQ, launch RPM, and shift RPM. It should be tight but close, then I'll just try and sneek up on just enough slip.

Traction without the slip did this :cry: and a few other things more than once.
Image

Thanks again ---Bill.
good lord... Ouch...

I grimaced at the sight of that...

I guess that's the kind of stuff that I'll be looking at if I do wind up in racing...
Image
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Re: Any 9 sec stick cars here? (NEW) Launch Vid. 8-1-07

Post by sc68z28 » Wed Aug 01, 2007 12:27 pm

jaydubb wrote: What RPM are you leavng at? What have you broken so far? What tranny? You might also want to try RAM clutch.
I was leaving at 4200rpm (street twin)
So far the street twin broke 2 gear sets, bent the leaf springs, and bent the trac bars.
The trans is a G-force GF5R clutch assit, its a dog-ring/face plate type.
trans info here http://www.g-forcetransmissions.com/tran_gf5r.asp

On a positive note, with the new clutch, http://www.advancedclutches.com/products.htm#Sportsman now leaving at 6K, 60's are now 1.45 to 1.50. A tenth+ improvement. :D
The vidio is an 1/8 mile track test last week. On the first pass I was out of the grove (to the left at launch) Shifting at 6900, clutchless shifts from 2nd to 3rd and 3rd to 4th, I'm still learning that part.

Vidio http://www.youtube.com/user/sc68z28

Launch pics
http://bowtie0069.fotki.com/72607irwind ... g5994.html
http://bowtie0069.fotki.com/72607irwind ... g5862.html
http://bowtie0069.fotki.com/72607irwind ... g6039.html

There is still work to be done, I'm hoping that there are 1.3 60's in it. It's going the right direction.
---Bill.
1968 Camaro G-force 5 speed
9.20 vid http://www.youtube.com/watch?v=7eiVf6StIFE

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Re: Any 9 sec stick cars here? (NEW) Launch Vid. 8-1-07

Post by jaydubb » Wed Aug 01, 2007 5:03 pm

sc68z28 wrote:
jaydubb wrote: What RPM are you leavng at? What have you broken so far? What tranny? You might also want to try RAM clutch.
I was leaving at 4200rpm (street twin)
So far the street twin broke 2 gear sets, bent the leaf springs, and bent the trac bars.
The trans is a G-force GF5R clutch assit, its a dog-ring/face plate type.
trans info here http://www.g-forcetransmissions.com/tran_gf5r.asp

On a positive note, with the new clutch, http://www.advancedclutches.com/products.htm#Sportsman now leaving at 6K, 60's are now 1.45 to 1.50. A tenth+ improvement. :D
The vidio is an 1/8 mile track test last week. On the first pass I was out of the grove (to the left at launch) Shifting at 6900, clutchless shifts from 2nd to 3rd and 3rd to 4th, I'm still learning that part.

Vidio http://www.youtube.com/user/sc68z28

Launch pics
http://bowtie0069.fotki.com/72607irwind ... g5994.html
http://bowtie0069.fotki.com/72607irwind ... g5862.html
http://bowtie0069.fotki.com/72607irwind ... g6039.html

There is still work to be done, I'm hoping that there are 1.3 60's in it. It's going the right direction.
---Bill.
Nice! I was gonna suggest the Mcleod Soft-Lok but it looks like you already have this issue nailed.

Yeah, Im pretty familiar with the G-Force GF5R. In fact, one of my buddies has a Lethal Weapon (old name for the GF5R). It was going in a 73 Camaro that never got completed. Im looking forward to running a G-Force T56. I have a 91 Camaro that Im build a turbocharged 408 LSx engine for. The T56 will go behind it...

Question about your cluch... How is the engagement? How does it behave on the street? I wanna cruise my car occasionally when its done. I dont want an on-off type of clutch.

Clutchless upshifting with the clutch-assisted GF5R... I was told that all you have to do is let off of the throttle SLIGHTLY and you should be able to shift it. All youre doing is taking a little load off of the face-teeth. Kinda like a motorcycle tranny. Im a clutch-type power-shifter myself. I PERSONALLY think that letting off of the throttle a bit might be a lil too harsh on the face-teeth. Again, this is just MY opinion. I would ask G-Force and see what they say.
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Post by Azrael » Wed Aug 01, 2007 7:39 pm

I was, like jaydubb, recommend the McLeod Twin, and then the RAM clutches; but I am glad you got this locked down. I am surprised to see the 9" gears missing teeth! Definately a nice ride!
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Post by jaydubb » Thu Aug 02, 2007 9:36 am

Azrael wrote:I am surprised to see the 9" gears missing teeth! Definately a nice ride!
I was surprised also.
2002 Maxima SE 6-speed 3.5 V-6
1998 Grand Prix GTP 3800 SC V-6
1991 Camaro RS 5 speed 5.0 V8
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Post by wannabe » Thu Aug 02, 2007 12:56 pm

comingbackdown wrote:
sc68z28 wrote:
GarySheehan wrote: If hydraulic, is there any type of fluid flow limiter that might slow the clutch down so it takes a little longer to get to full clamping force? Or if cable operated, some type of return damper? Something that's tunable so you can dial it in. This might help soften the bite off the launch,
Are there stickier tires that you could use in your current class?
Thanks for your reply Gary, my linkage is all mechanical, but your on the right track. What a good drag clutch does is slip a little, takes the shock out of the initial hit and after gear changes. Mcleod makes one called Soft-lock, but its kind of a one size fits all, works for some people. I've heard adjusting one from scratch can be a daunting task. At roughly $1800, if you miss on the adjust and burn it, you get to start all over :x .

The clutch I just got, comes with a base set up. It's taylored to my cars weight, HP, TQ, launch RPM, and shift RPM. It should be tight but close, then I'll just try and sneek up on just enough slip.

Traction without the slip did this :cry: and a few other things more than once.
Image

Thanks again ---Bill.
good lord... Ouch...

I grimaced at the sight of that...

I guess that's the kind of stuff that I'll be looking at if I do wind up in racing...
why did u grimace? what is it? whats wrong w/ it? i confuzzled....
Currently not driving anything - the escort died april 2014 and there's no funds to replace it

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Re: Any 9 sec stick cars here? (NEW) Launch Vid. 8-1-07

Post by sc68z28 » Thu Aug 02, 2007 12:57 pm

jaydubb wrote: I have a 91 Camaro that Im build a turbocharged 408 LSx engine for. The T56 will go behind it...
Question about your cluch... How is the engagement? How does it behave on the street? I wanna cruise my car occasionally when its done. I dont want an on-off type of clutch.
Clutchless upshifting with the clutch-assisted GF5R... I was told that all you have to do is let off of the throttle SLIGHTLY
Jay, your turbo, LS, T56 combo, sounds like it's going to be a killer piece.
Engagement on my clutch is very smooth, with little pedal effort. I would think that the Soft-Lock or Ram versions are also similar. For any hard or prolonged street use, you would want to add base pressure (take out some of the slip).
Actually the Street Twin was a great street clutch, it has smooth engagement too, just hits to hard when you dump it at line with slicks.

Clutchless upshifting on the street is easy, like you said just let off a lil (rpm gear matching) and it comes out and right in the next.
I just have a mental block when I'm going down the track. My right foot wants to stay planted on the floor. So what seems to be working, at shift rpm, I hit the two-step button on the shifter, the motor stumbles just enough to come out and into the next.

3rd member is a Strange nodular iron case with 9" gears.

---Bill.
1968 Camaro G-force 5 speed
9.20 vid http://www.youtube.com/watch?v=7eiVf6StIFE

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