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How do you keep the C3 from getting light above 120mph?

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How do you keep the C3 from getting light above 120mph?

 
Old 02-10-2014, 01:46 PM
  #221  
Patro46
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How do you keep your car on the ground over 120? Simple. Put my mother in law in the passenger seat and you will be glued to the ground!
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Old 02-17-2014, 10:18 PM
  #222  
FastEddy
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Originally Posted by pauldana View Post
EXACTLY what i need to do also....i screwed up ordering the .64 od... should have done the .82.... bad mistake
Here's what you need to swap to the .82:

1 output shaft - one of the two fifth gears is part of the shaft.
2 5th gear
3 get 9 new rubber o rings for the shifter rails
4 rubber o ring for front countershaft bearing cup if you have any signs of seepage.
5 shim kit, so you can reset end play on both shafts to .000
6 new nylon shift fork bushings - convert to brass while your at it for drag guys -

Under $500 in parts, and lots of fun with snap rings, roll pins, and needle bearings

Of course new synchro rings is not a bad idea if you're a slam shifting drag racer

I used to come out of 4th at 6,300, and drop down to 4,000... Now it should drop to 5,200 or so - perfect.

Last edited by FastEddy; 02-17-2014 at 10:33 PM.
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Old 05-15-2017, 11:26 PM
  #223  
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Originally Posted by vette427-sbc View Post
Ive hit 130 on the road course (no more gear left) But I can say there is a big difference compared to nothing.
Look at BeeJays custom Pace car spoiler. I would say his looks the best and is probably the most functional.
Here is mine... The aluminum support rods are "consumables" but the fiberglass will flex enough if you scrape a driveway. The only reason I have scraped my splitter/bent a support rod is because I was forced to enter a driveway at a less than optimal approach angle or I wasnt paying attention and hit a HUGE pot hole. Most speedbumps are no taller than 3" and if they are, they are the speed "humps" that span a further distance so I still wont scrape.
Your pm box is full, How long are the rods ans where did you get them?
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Old 05-16-2017, 12:21 AM
  #224  
vetteguy22
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Originally Posted by Patro46 View Post
How do you keep your car on the ground over 120? Simple. Put my mother in law in the passenger seat and you will be glued to the ground!
Ouch!!
I've been 125 plus on the road coarse. Ran out of straight, still had 1 1/2 gears to go.

Last edited by vetteguy22; 05-16-2017 at 12:23 AM. Reason: Adding
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Old 05-16-2017, 08:52 AM
  #225  
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Originally Posted by vetteguy22 View Post
Ouch!!
I've been 125 plus on the road coarse. Ran out of straight, still had 1 1/2 gears to go.
You got to admit that even 120 is a hoot. That was just about what I'd hit on the back stretch of the 'Mile'. T
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Old 05-16-2017, 09:33 AM
  #226  
vetteguy22
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Originally Posted by terrys6t8roadster View Post
You got to admit that even 120 is a hoot. That was just about what I'd hit on the back stretch of the 'Mile'. T
It sure is. What I loved was that the Dodge Viper wasn't able to pass me.
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Old 05-16-2017, 10:32 AM
  #227  
pauldana
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there was a tone of very good information on this thread for those of us that do this...
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Old 05-16-2017, 10:51 AM
  #228  
AboveTheLogic
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Took my stock-bodied 79 up to 125 mph going uphill a couple of weekends back while tooling around with a friend in a C7. Felt fine. Steeroids / Street & Slalom Suspension / 255/45ZR18 (Y) tires all helped I'm sure.

Not sure about doing that same speed downhill though!
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Old 05-16-2017, 11:48 AM
  #229  
pauldana
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Originally Posted by AboveTheLogic View Post
Took my stock-bodied 79 up to 125 mph going uphill a couple of weekends back while tooling around with a friend in a C7. Felt fine. Steeroids / Street & Slalom Suspension / 255/45ZR18 (Y) tires all helped I'm sure.

Not sure about doing that same speed downhill though!
big big big difference at 120 than 160... these cars START to float at 120.. to to 120 you are fine... tell me how you fell at 160 0r 180 or higher..

These are the speeds we are trying to obtain and not die.
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Old 05-16-2017, 04:18 PM
  #230  
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Originally Posted by pauldana View Post
Well that's the question... I have the following mods for suspention but above 120 I can still feel her starting to get light, and at arond 160 it's just not good.... So here are the mods:

I am between 3-4" off the ground from frame or exhaust. #550 front springs cut 1/2 coil, bilstine sport shocks, #360 rear carbon fibor spring, spreader bar, tires and wheels rated for such speeds... Large front and rear sway bars, rack and pinion...so for just suspension that is what I have.

I think I'm not letting enough air escape from under the hood,,,, I saw Beejay install hood vents, so I think that that will be my next mod.... Any other ideas? Thx

Bellypan. There are none commercially available for our cars, so you should make one and then make a small production run for some of the rest of us so we can buy them 3 years from now. ;-)

(Couldn't resist, Paul; had to be said.) ;-)


Adam

Last edited by NewbVetteGuy; 05-16-2017 at 04:34 PM.
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Old 05-16-2017, 04:47 PM
  #231  
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Originally Posted by pauldana View Post
Well that's the question... I have the following mods for suspention but above 120 I can still feel her starting to get light, and at arond 160 it's just not good.... ....rack and pinion........
Paul,

Do you find the steering feels scary / squirrelly at speed with the Steeroids Rack?? -I don't even like mine at like about 75mph... Feels like tiny corrections to the wheel just make the car dart all over the road...


Adam
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Old 05-16-2017, 05:17 PM
  #232  
pauldana
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Originally Posted by NewbVetteGuy View Post
Paul,

Do you find the steering feels scary / squirrelly at speed with the Steeroids Rack?? -I don't even like mine at like about 75mph... Feels like tiny corrections to the wheel just make the car dart all over the road...


Adam
No,,, you have a problem... to hi pressure? alignment not correct?
Caster not set far enough??
http://aligncraft.com/terms/terms.html
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Old 05-16-2017, 05:56 PM
  #233  
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Simple answer....slow down. Apologize if you are on a track, but otherwise, nobody has right to go that fast on the streets and it is irresponsible and dangerous. Many have been killed doing it, and its not always the driver.
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Old 05-16-2017, 06:05 PM
  #234  
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Originally Posted by pauldana View Post
No,,, you have a problem... to hi pressure? alignment not correct?
Caster not set far enough??
http://aligncraft.com/terms/terms.html
Low pressure (850 or 950 PSI stock pump); alignment probably royally screwed up and I think minor u-joint binding...

Glad to hear that when it's setup properly it won't be so squirrelly.

Adam
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Old 05-16-2017, 07:39 PM
  #235  
pauldana
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Originally Posted by iwasmenowhesgone View Post
Simple answer....slow down. Apologize if you are on a track, but otherwise, nobody has right to go that fast on the streets and it is irresponsible and dangerous. Many have been killed doing it, and its not always the driver.
Thank you mommy... for that informative note, will keep in mind..



Originally Posted by NewbVetteGuy View Post
Low pressure (850 or 950 PSI stock pump); alignment probably royally screwed up and I think minor u-joint binding...

Glad to hear that when it's setup properly it won't be so squirrelly.

Adam
You have to get that u-joint 100% correct.. and that caster is very important.

Putting a pan on a C3 would be bitch
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Old 05-16-2017, 07:45 PM
  #236  
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Originally Posted by NewbVetteGuy View Post
Bellypan. There are none commercially available for our cars, so you should make one and then make a small production run for some of the rest of us so we can buy them 3 years from now. ;-)

(Couldn't resist, Paul; had to be said.) ;-)


Adam
It would have to be out of some sort of plastic..
But it would be in several parts due to exhaust and all the crap hanging down all over the place...

O.. and I have about 6 CAI left and made:-)
DD mods is a saler on the forum

Last edited by pauldana; 05-16-2017 at 07:46 PM.
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Old 05-17-2017, 02:39 AM
  #237  
AboveTheLogic
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Originally Posted by pauldana View Post
big big big difference at 120 than 160... these cars START to float at 120.. to to 120 you are fine... tell me how you fell at 160 0r 180 or higher..

These are the speeds we are trying to obtain and not die.
Yeah I'm not ready to try any of that. Car has the power and gearing to go way faster than I care to try.
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Old 05-17-2017, 06:47 AM
  #238  
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I have the Steeroids R/P in the 6t8 and as mentioned that it is to quick, I'm going to move to the outer holes on the steer knuckle to see if this helps to slow it down. T
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Old 05-17-2017, 10:39 AM
  #239  
Gale Banks 80'
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Originally Posted by iwasmenowhesgone View Post
Simple answer....slow down. Apologize if you are on a track, but otherwise, nobody has right to go that fast on the streets and it is irresponsible and dangerous. Many have been killed doing it, and its not always the driver.
I would like to point out that Texas now has the highest speed limit at 85. And there are a number of states that 75 can be driven with out breaking any laws.

If the car is darting back and forth at speed I would blame your state for not maintaining the roads and allowing them to become cuped. Wide Tires. A 1958 Suspension design intended for 5.5" wheels. Worn parts and or a collection of all of this. Having run the Nevada 100 in 1993 when Highway 318 was at its worst this was very apparent at speed ! In Seattle we have some of the worst road maintenance in the country and I was surprised what a difference going from a performance tire to a regular production tire made on a late model sedan.
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Old 05-17-2017, 11:10 AM
  #240  
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I gotta wonder if the 78 to 82 have a greater tendency to float vs the 77 and prior body styles.
The Big back window and the the resulting shape more closely resemble the shape of a wing. This would I believe have a greater tendency to create "lift" in a direction that would make the car light on the ground.

With the scoop back design the air might have a greater tendency to turbulate after it cleared the back window spoiling lift. Just an observation of the two shape differences, no Idea if it's valid.

On my 77 I extended the front spoiler (air dam) to increase air flow to the radiator. It may have had the unintended effect of reducing the amount of air flowing under the car as well. I have done 135 MPH in a 30 MPH headwind, so as far as the car was concerned I was doing 165 MPH, and did not experience any float that I could detect. Straight line only of course.

Not done any study on this subject but wouldn't a belly pan reduce drag, but increase the positive pressure under the car creating a greater float tendency? Unless some kind of spoiler was used to divert or ruin the airflow/pressure under the car?
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