When giving tech advice:
Safety Car
Joined: Mar 2002
Posts: 4,928
Likes: 1
Cruise-In V Veteran
St. Jude Donor '09
Re: When giving tech advice: (Heretic)
My favorite internet car related myth. Less backpressure ="less torque"
I posted 1 1/2 years ago about the Grand Am cam. Repeatedly, I was told this. In fact some respected tuners stated that it wouldn't be a good " Power" cam. Pure internet myth. My .02.
:D
Drifting
Joined: Apr 2001
Posts: 1,763
Likes: 24
From: Austin TX
Re: When giving tech advice: (Dave68)
Someone asks how fast a 2001 coupe is in 0-60 MPH. How many of us have the $10,000 instrument that Car & Driver and other car mags have to actually find out?
Thread Starter
Tech Contributor
Joined: Mar 2003
Posts: 12,094
Likes: 197
From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
Re: When giving tech advice: (Richin Chicago)
Your car won't break in with synthetic oil.
It's cheap insurance to channge oil every 3000 miles.
It's cheap insurance to channge oil every 3000 miles.
I do change oil often. I guess I dont't care how much $$$ gm gets to market the oil.
My favorite myth has to be the 4.10 gears issues:
The car will not be driveable on the hiway (high RPM)
The wheels will spin too much if you go to 4.10's: Gearing a car with 4.10's helps traction by slowing down the number of tire revolutions per engine rpm. While the fact is that you will break loose more often, the distance you travel will be shorter until you hook. I have 6.13's in my dart.
Mileage will suffer too.....I get 25 with the 4.10's.
I have never seen one anti-gearing post by anyone who geared.
Racer
Joined: Oct 2003
Posts: 333
Likes: 0
From: COWFORD FL
Re: When giving tech advice: (SpinMonster)
C'mon we all know these guys
1-aluminum flywheels cause harder launches
2-You get KR with compression over 11:1
3-heads dont give you much power increase
4-Gears over 373 are bad for hiway driving
5-East Coast: LG headers suck
6-West coast: Kooks headers suck
7-Ohio: FLP's rule
the myths just never stop
1-aluminum flywheels cause harder launches
2-You get KR with compression over 11:1
3-heads dont give you much power increase
4-Gears over 373 are bad for hiway driving
5-East Coast: LG headers suck
6-West coast: Kooks headers suck
7-Ohio: FLP's rule
the myths just never stop
1. the c5 is very well balanced bone stock from the factory and you really have do your homework to improve on it using only bolt-on 'performance' parts.
2. 117 octane xylene mixed 30%-70% with 93 octane gives you 100 octane.
3. 160 f. tstats lower your engine's thermal efficiency, not raise it, thereby costing you power.
4. drilling holes in your disc rotors reduces their mass, makes them less effective in absorbing heat braking energy and makes them liable to crack along the holes. but what the hay, they look real kewl...
5. installing aftermarket exhausts and pipes for many hundreds of $ will enable you to make lots of noise, look real cool but not make any real measurable torque or hp.
6. lowering your c5 more than 1 inch will result in more scraping on driveways, and you should get shorter shocks if you go below 1".
7. changing your mobil1 synthetic oil every 3,000 miles is a waste of money, use the dic 'oil remaining' values instead.
8. running a supercharger above 6 1/2 #'s boost on a stock ls6 engine is not a good idea.
Drifting
Joined: Aug 2003
Posts: 1,986
Likes: 1,323
From: Des Plaines, Il
Re: When giving tech advice: (Sandra Bigwoode)
4. drilling holes in your disc rotors reduces their mass, makes them less effective in absorbing heat braking energy and makes them liable to crack along the holes. but what the hay, they look real kewl...
Thread Starter
Tech Contributor
Joined: Mar 2003
Posts: 12,094
Likes: 197
From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
Re: When giving tech advice: (Mike Mercury)
my fav:
rear axle change in a C5 will throw your speedo off.
rear axle change in a C5 will throw your speedo off.
Anyway I got an IM about 4.10's today. Nice guy and he said that he was told.....ding ding ding......that they lower your top speed.
Well guys I personally went 180 in 6TH GEAR (4750rpm) and it was still climbing. I had the headlights up and a passenger. I have a feeling that with cold air, new PIAA's and no passenger, it will hit very close to 200.
4.10's put the motor into the power band again and let you use 6th as the top speed gear. NEPTUNEBILL did 195 or so with 3.90's (and like my run, it wasnt the limit). Lingenfelter said on his site that 450rwhp and 4.10's were all that was nec. for 200mph with all else working for you. Best I did in 5th gear was 177 with 3.42's which was the vehicle limit and not at the redline.
Safety Car
Joined: Sep 2001
Posts: 4,411
Likes: 1
From: Wilmington NC
Re: When giving tech advice: (SpinMonster)
my fav:
rear axle change in a C5 will throw your speedo off.
SHHHH, hey Mike I think for the automatics it does!!
Anyway I got an IM about 4.10's today. Nice guy and he said that he was told.....ding ding ding......that they lower your top speed.
Well guys I personally went 180 in 6TH GEAR (4750rpm) and it was still climbing. I had the headlights up and a passenger. I have a feeling that with cold air, new PIAA's and no passenger, it will hit very close to 200.
4.10's put the motor into the power band again and let you use 6th as the top speed gear. NEPTUNEBILL did 195 or so with 3.90's (and like my run, it wasnt the limit). Lingenfelter said on his site that 450rwhp and 4.10's were all that was nec. for 200mph with all else working for you. Best I did in 5th gear was 177 with 3.42's which was the vehicle limit and not at the redline.
rear axle change in a C5 will throw your speedo off.
SHHHH, hey Mike I think for the automatics it does!!
Anyway I got an IM about 4.10's today. Nice guy and he said that he was told.....ding ding ding......that they lower your top speed.
Well guys I personally went 180 in 6TH GEAR (4750rpm) and it was still climbing. I had the headlights up and a passenger. I have a feeling that with cold air, new PIAA's and no passenger, it will hit very close to 200.
4.10's put the motor into the power band again and let you use 6th as the top speed gear. NEPTUNEBILL did 195 or so with 3.90's (and like my run, it wasnt the limit). Lingenfelter said on his site that 450rwhp and 4.10's were all that was nec. for 200mph with all else working for you. Best I did in 5th gear was 177 with 3.42's which was the vehicle limit and not at the redline.
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Melting Slicks
Joined: Jul 2003
Posts: 3,427
Likes: 2
From: Fountain Inn, South Carolina
Re: When giving tech advice: (Richin Chicago)
C'mon we all know these guys
1-aluminum flywheels cause harder launches
2-You get KR with compression over 11:1
3-heads dont give you much power increase
4-Gears over 373 are bad for hiway driving
5-East Coast: LG headers suck
6-West coast: Kooks headers suck
7-Ohio: FLP's rule
the myths just never stop
Your car won't break in with synthetic oil.
It's cheap insurance to channge oil every 3000 miles.
C5 rotors warp easily.
Changing stock plug wires, even if they are in good shape, will give you more horsepower.
Cross drilled rotors give you better braking performance.
This $400.00 intake will give you xx more horsepower. I can tell by the feel.
Zaino lasts longer than anything else.
1-aluminum flywheels cause harder launches
2-You get KR with compression over 11:1
3-heads dont give you much power increase
4-Gears over 373 are bad for hiway driving
5-East Coast: LG headers suck
6-West coast: Kooks headers suck
7-Ohio: FLP's rule
the myths just never stop
Your car won't break in with synthetic oil.
It's cheap insurance to channge oil every 3000 miles.
C5 rotors warp easily.
Changing stock plug wires, even if they are in good shape, will give you more horsepower.
Cross drilled rotors give you better braking performance.
This $400.00 intake will give you xx more horsepower. I can tell by the feel.
Zaino lasts longer than anything else.
Safety Car
Joined: Sep 2001
Posts: 4,411
Likes: 1
From: Wilmington NC
Re: When giving tech advice: (George8211)
C'mon we all know these guys
1-aluminum flywheels cause harder launches
2-You get KR with compression over 11:1
3-heads dont give you much power increase
4-Gears over 373 are bad for hiway driving
5-East Coast: LG headers suck
6-West coast: Kooks headers suck
7-Ohio: FLP's rule
the myths just never stop
Your car won't break in with synthetic oil.
It's cheap insurance to channge oil every 3000 miles.
C5 rotors warp easily.
Changing stock plug wires, even if they are in good shape, will give you more horsepower.
Cross drilled rotors give you better braking performance.
This $400.00 intake will give you xx more horsepower. I can tell by the feel.
Zaino lasts longer than anything else.
Are you telling that all this stuff is not true :confused: :lol: :lolg:
1-aluminum flywheels cause harder launches
2-You get KR with compression over 11:1
3-heads dont give you much power increase
4-Gears over 373 are bad for hiway driving
5-East Coast: LG headers suck
6-West coast: Kooks headers suck
7-Ohio: FLP's rule
the myths just never stop
Your car won't break in with synthetic oil.
It's cheap insurance to channge oil every 3000 miles.
C5 rotors warp easily.
Changing stock plug wires, even if they are in good shape, will give you more horsepower.
Cross drilled rotors give you better braking performance.
This $400.00 intake will give you xx more horsepower. I can tell by the feel.
Zaino lasts longer than anything else.
Are you telling that all this stuff is not true :confused: :lol: :lolg:
Beauty is in the mind of the beholder...
Team Owner
Joined: Apr 2001
Posts: 54,204
Likes: 180
From: S.W. Ohio. . . . . . NRA Life Member
Re: When giving tech advice: (Richin Chicago)
SHHHH, hey Mike I think for the automatics it does!!
Racer
Joined: Oct 2003
Posts: 333
Likes: 0
From: COWFORD FL
Re: When giving tech advice: (Richin Chicago)
Well guys I personally went 180 in 6TH GEAR (4750rpm) and it was still climbing. I had the headlights up and a passenger. I have a feeling that with cold air, new PIAA's and no passenger, it will hit very close to 200.
4.10's put the motor into the power band again and let you use 6th as the top speed gear. NEPTUNEBILL did 195 or so with 3.90's (and like my run, it wasnt the limit). Lingenfelter said on his site that 450rwhp and 4.10's were all that was nec. for 200mph with all else working for you. Best I did in 5th gear was 177 with 3.42's which was the vehicle limit and not at the redline.
4.10's put the motor into the power band again and let you use 6th as the top speed gear. NEPTUNEBILL did 195 or so with 3.90's (and like my run, it wasnt the limit). Lingenfelter said on his site that 450rwhp and 4.10's were all that was nec. for 200mph with all else working for you. Best I did in 5th gear was 177 with 3.42's which was the vehicle limit and not at the redline.
A fairly simple program I have says for the frontal area and CD of a C5 you need around 560 HP to do 200 MPH.
iirc and the lingenfelter site seems to be down right now, but they needed 500+ rwhp to pull 200 mph, the c4 and c5 are drag limited on top speed regardless of gearing and tire sizes...
Safety Car
Joined: Sep 2001
Posts: 4,411
Likes: 1
From: Wilmington NC
Re: When giving tech advice: (Sandra Bigwoode)
A fairly simple program I have says for the frontal area and CD of a C5 you need around 560 HP to do 200 MPH.
[b]yowsah, please post a link!
iirc and the lingenfelter site seems to be down right now, but they needed 500+ rwhp to pull 200 mph, the c4 and c5 are drag limited on top speed regardless of gearing and tire sizes...
It assumes a 345 HP corvette tops out at 170 and then uses the formula ((A3/A1)^3)*C1 Where A3 is the desired speed and A1 is 170 MPH and C1 is 345 HP. It assumes you have to increase the horsepower by a factor of 8x (cubed) to increase the speed 2x Aerodynamic drag is a real b*tch!
Melting Slicks
Joined: Jul 2003
Posts: 3,427
Likes: 2
From: Fountain Inn, South Carolina
Re: When giving tech advice: (Richin Chicago)
A fairly simple program I have says for the frontal area and CD of a C5 you need around 560 HP to do 200 MPH.
lingenfelter site ... but they needed 500+ rwhp to pull 200 mph
:smash:
Safety Car
Joined: Sep 2001
Posts: 4,411
Likes: 1
From: Wilmington NC
Re: When giving tech advice: (66ImpalaLT1)
Wow, this thread has turned into a typical C5 Tech thread. People posting theory and hearsay with no personal experience or references.
http://www.trackaero.com/factors1.html
Notice the 8x to go from 100 to 200 MPH.
Melting Slicks
Joined: Jul 2003
Posts: 3,427
Likes: 2
From: Fountain Inn, South Carolina
Re: When giving tech advice: (66ImpalaLT1)
Thats very interesting, but I'm not sure if thats entirely valid since you dont drive a 1 square foot plate.
Safety Car
Joined: Sep 2001
Posts: 4,411
Likes: 1
From: Wilmington NC
Re: When giving tech advice: (66ImpalaLT1)
Thats very interesting, but I'm not sure if thats entirely valid since you dont drive a 1 square foot plate.
"Since rolling resistance force is not a function of speed, then rolling resistance horsepower (a function of speed) increases proportionally with speed. Since aerodynamic drag force is proportional to the square of the car's speed, then aerodynamic drag horsepower increases proportionally to the cube of the car's road speed."
http://kennedyp.iccom.com/pat/road-load.htm
[Modified by Richin Chicago, 12:05 AM 5/22/2004]