Road Course Junkies, Let's compare notes
Melting Slicks
Joined: Dec 1999
Posts: 2,116
Likes: 156
From: Mid West
Cruise-In III Veteran
I run a Holley. What model do you have? I'm running a BG Demon 650 with mechanical secondaries.
Does your carb have center hung floats? Yeah, I have the drag racing floats in the secondaries with jet extensions.
Do you have the problem after braking, or just mid corner? It's usually as I am coming out of the corner.
Does your carb have center hung floats? Yeah, I have the drag racing floats in the secondaries with jet extensions.
Do you have the problem after braking, or just mid corner? It's usually as I am coming out of the corner.
... I talked to a race carb shop and they sold me the new NASCAR longer needle and seats that are anti-foaming and I installed the old drag racing idea jet extensions in my rear bowls. He also told me to run the fuel at under mid sight glass level.
Are the NASCAR needle sold by Holley or someone else?
The other potential problem is: As you start exceeding one "G" turns fuel can slosh out the bowl vents. So you can run a tube from front to rear vent with a "T" in the middle to the open air. Then any fuel slosh won't give you that instant rich. I will have to try that. I am starting to corner at ~0.9 g's with spikes up to 1.1 g's so it might be time for this modification.
I run 5 psi fuel pressure. That's about the same pressure as I am running with my Demon.
Are the NASCAR needle sold by Holley or someone else?
The other potential problem is: As you start exceeding one "G" turns fuel can slosh out the bowl vents. So you can run a tube from front to rear vent with a "T" in the middle to the open air. Then any fuel slosh won't give you that instant rich. I will have to try that. I am starting to corner at ~0.9 g's with spikes up to 1.1 g's so it might be time for this modification.
I run 5 psi fuel pressure. That's about the same pressure as I am running with my Demon.
Melting Slicks
Joined: Dec 1999
Posts: 2,116
Likes: 156
From: Mid West
Cruise-In III Veteran
. Got to get a couple of these on order this winter 
.
Team Owner
Joined: Apr 2002
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From: All humans are vermin in the eyes of Guru VA
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Cruise-In V Veteran
I had a similar problem with my demon 750. Kind of an instantaneous hiccup on uphill tight turns with WOT. I talked to a race carb shop and they sold me the new NASCAR longer needle and seats that are anti-foaming and I installed the old drag racing idea jet extensions in my rear bowls. He also told me to run the fuel at under mid sight glass level.
The other potential problem is: As you start exceeding one "G" turns fuel can slosh out the bowl vents. So you can run a tube from front to rear vent with a "T" in the middle to the open air. Then any fuel slosh won't give you that instant rich.
I run 5 psi fuel pressure
The other potential problem is: As you start exceeding one "G" turns fuel can slosh out the bowl vents. So you can run a tube from front to rear vent with a "T" in the middle to the open air. Then any fuel slosh won't give you that instant rich.
I run 5 psi fuel pressure
http://www.moroso.com/catalog/catego...?catcode=32034
Le Mans Master
Joined: Apr 2007
Posts: 7,353
Likes: 72
From: Graceland in a Not Correctly Restored Stingray
Melting Slicks
Joined: Dec 1999
Posts: 2,116
Likes: 156
From: Mid West
Cruise-In III Veteran
Yeah, I always liked BG products. A bit more expensive than Holley but I've always had good luck with them. I have a Gold Claw on my Cutlass and a Demon on my 76. Both carb's have worked great for me so far ............ I just purchased two of their 'road racing' floats from Jegs this morning. I'm going to try and wire in an air/fuel ratio for next year and patch it into my data system to help determine what the problem is and to see just how lean/rich I'm running at different points.
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Thread Starter
Melting Slicks
Joined: Feb 2003
Posts: 3,053
Likes: 4
St. Jude Donor '03,'11
I've not been to a track in 2 years. I love driving the car on the track but i'm weary of putting all the work into this POS to keep it track worthy.
I guess there's a reason why not many have run a C3 for any length of time. I got about 10 years so i guess that's not bad.
I guess there's a reason why not many have run a C3 for any length of time. I got about 10 years so i guess that's not bad.
Last edited by turtlevette; Nov 19, 2009 at 11:55 PM.
Melting Slicks
Joined: Dec 1999
Posts: 2,116
Likes: 156
From: Mid West
Cruise-In III Veteran
I guess its the just the fabricator / mech. engineer in me that likes to see just how fast I can make older cars run. I don't see it as a chore to up keep or improve, but a challenge and a hobby. My cars are a bit rough around the edges, but I still have gotten awards at local car shows so they're not that bad . I use the Cutlass now just for drag racing and local cruises, but it has been down a couple years while I have been concentrating on other things.
I like playing with the tuning of the engine and the suspension, rather than buying a pre-engineered one from GM for big $$$'s with all the electronic helpers. If you screw up in a C3, it lets you know it in a big way (usually a nice 180 spin and off the inside of the corner).
. I use the Cutlass now just for drag racing and local cruises, but it has been down a couple years while I have been concentrating on other things.I like playing with the tuning of the engine and the suspension, rather than buying a pre-engineered one from GM for big $$$'s with all the electronic helpers. If you screw up in a C3, it lets you know it in a big way
(usually a nice 180 spin and off the inside of the corner).
Tech Contributor
Joined: Jun 2004
Posts: 20,905
Likes: 962
From: I tend to be leery of any guy who doesn't own a chainsaw or a handgun.
I guess its the just the fabricator / mech. engineer in me that likes to see just how fast I can make older cars run. I don't see it as a chore to up keep or improve, but a challenge and a hobby. ...............................
I like playing with the tuning of the engine and the suspension, rather than buying a pre-engineered one from GM for big $$$'s with all the electronic helpers. If you screw up in a C3, it lets you know it in a big way (usually a nice 180 spin and off the inside of the corner).
.................
I like playing with the tuning of the engine and the suspension, rather than buying a pre-engineered one from GM for big $$$'s with all the electronic helpers. If you screw up in a C3, it lets you know it in a big way
(usually a nice 180 spin and off the inside of the corner)..................
I got the C4 suspension finished under the '69 last spring (pulling about 150 pounds of weight out of the car in the process). I no longer have the rear twitchiness issues common with the old suspension geometry, and the car handling is very predictable. The car currently weighs 3015 pounds with an eighth of a tank of fuel and no driver, moving up to 3050 pounds when I get time to get the rear bumpers and spare tire bucket bolted back on. (I need to do a minor tweak to the bucket to clear the rear toe bracket.)
Just got my pistons this week for my ZL1 build. With this engine I should be able to get the car weight down to 2900 pounds, while still looking completely stock (The interior is stock and complete.)
My car is also a bit rough around the edges. I've been too busy with the fabrication activities to do any waxing.
Thread Starter
Melting Slicks
Joined: Feb 2003
Posts: 3,053
Likes: 4
St. Jude Donor '03,'11
That course you're on is flat as a pancake. Running a course with elevation changes and banking really lets you get some G forces going. It looks really safe though. Most of the courses i run have a lot of concrete barriers and a few guys have had bad accidents hitting them. No injuries but totalled cars.
Jason, I think its great you campain a C3. I have for 10 years and i'm not saying i'm quitting but i'm definitely getting weary. You're a younger guy with more energy. I guess i understand now why a lot of older guys just buy new cars. I need a maintenance crew.
72 Ray has long since changed to running a mustang. I don't know of anyone who has done this long term that is still doing it.
Jason, I think its great you campain a C3. I have for 10 years and i'm not saying i'm quitting but i'm definitely getting weary. You're a younger guy with more energy. I guess i understand now why a lot of older guys just buy new cars. I need a maintenance crew.
72 Ray has long since changed to running a mustang. I don't know of anyone who has done this long term that is still doing it.
Last edited by turtlevette; Nov 20, 2009 at 10:12 AM.
Tech Contributor
Joined: Jun 2004
Posts: 20,905
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From: I tend to be leery of any guy who doesn't own a chainsaw or a handgun.
That course you're on is flat as a pancake. Running a course with elevation changes and banking really lets you get some G forces going. It looks really safe though. Most of the courses i run have a lot of concrete barriers and a few guys have had bad accidents hitting them. No injuries but totalled cars.
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I've got tons of miles at Mid-Ohio (in my Corvettes, my Yamaha R1, and in Formula Fords), so I'm familiar with elevation changes and concrete/Armco barriers.
The other tracks I've run (Putnam Park, Gingerman, and Nelson Ledges) have varying amounts of either elevation changes or non-compliant barriers in fast sections. I got my first ambulance ride at Putnam Park in 2000 after messing up at a turn that seems to incorporate a decreasing radius and an elevation change, so I have a deep respect for what can happen if you screw up.
ps: I just looked closely at Jason's avatar. That looks like the corner I screwed up at (Putnam Park).
Last edited by 69427; Nov 20, 2009 at 11:26 AM. Reason: Added postscript content.
Team Owner
Joined: Apr 1999
Posts: 21,953
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From: Reno Nevada
2024 C3 of the Year Finalist- Modified
I like playing with the tuning of the engine and the suspension, rather than buying a pre-engineered one from GM for big $$$'s with all the electronic helpers. If you screw up in a C3, it lets you know it in a big way (usually a nice 180 spin and off the inside of the corner).
(usually a nice 180 spin and off the inside of the corner).From speed direct I just ordered 650# front springs for my QA-1 dual adjust front semi coil overs. I was getting to much front end dive with the 550#
Are you using power rack steering?
Thread Starter
Melting Slicks
Joined: Feb 2003
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St. Jude Donor '03,'11
Have you been to Canada?
20 turns and 65 feet of elevation change.
Mosport and Mt. Tremblant are pretty awesome too. Mosport has the Mario Andretti straight (1.25 mile) where you can acutally max out your car.
Melting Slicks
Joined: Jan 2004
Posts: 3,247
Likes: 210
From: Detroit MI
Grattan is a blast, kind of like a roller coaster. I need to get back there, it's been a while. Next time hopefully my gearing will be a little better suited to the length of the straight.
Melting Slicks
Joined: Dec 1999
Posts: 2,116
Likes: 156
From: Mid West
Cruise-In III Veteran
I'm still using the factory steering ... just rebuilt and adjusted fairly tight. I actually like the steering and don't really want a faster steering ratio. (I would if I autocrossed more though)
Here's the local track that is 32 miles from my house. Not much elevation change, but nothing hardly to hit either. 10 turns in 1.8 miles.
Le Mans Master
Joined: Apr 2007
Posts: 7,353
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From: Graceland in a Not Correctly Restored Stingray
Yep, that's the one, but the photo doesn't do justice to the ups and downs ...nor the jump.
Only track on which I've run in Canada is Shannonville, which is IMHO better suited to motorcycles than cars. I'd like to do those others.
Only track on which I've run in Canada is Shannonville, which is IMHO better suited to motorcycles than cars. I'd like to do those others.
Tech Contributor
Joined: Jun 2004
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From: I tend to be leery of any guy who doesn't own a chainsaw or a handgun.
Mid-America motorplex in Iowa
Anybody have any experience with this track? I drive by it frequently when visting relatives in the midwest.