launching a C5
#21
Launching!
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Something to think about.I scan my car alot.I use 92 octane fuel.My car is always in the low octane tables.My buddy's 99 LS1 WS6 annivesary t.a. does not have this problem nor does my other f-body friend.
At the track,i used 92 octane,did not hear knock,but the timing was 21* across the RPMs,the run was 13.8 @ 101. (auto 3:15s-unprepped track)
After pulling fuses 16 and 23 to reset the PCM,i added a can of 104 octane boost.20 minutes later ran 13.3 @ 106 five times in a row,i think one was a 13.4...28* timing across the RPMs.Stays like this until i need to refuel,then if i don't add octane,back to the low tables,i just live with it and reset the PCM and use octane at the track.Alot of c5s do this,most owners don't even notice.If you race a LS1 f-body in the low tables,you stand a good chance of losing,i never lost to one in the high tables.
One thing that made me spit my coffee on my key pad,was launching at 3700rpms,if you try that on our track,you'll sit right at the line and spin like mad.Off idle or nothing on this track,unless you pay to join the pro-gas assoc,then pay the entry fee for a certain event,then they prep the track.I can only dream of a nice track....and take some of this humidity away..midnight and it's still 70% + humidity,we can't race during the day.
At the track,i used 92 octane,did not hear knock,but the timing was 21* across the RPMs,the run was 13.8 @ 101. (auto 3:15s-unprepped track)
After pulling fuses 16 and 23 to reset the PCM,i added a can of 104 octane boost.20 minutes later ran 13.3 @ 106 five times in a row,i think one was a 13.4...28* timing across the RPMs.Stays like this until i need to refuel,then if i don't add octane,back to the low tables,i just live with it and reset the PCM and use octane at the track.Alot of c5s do this,most owners don't even notice.If you race a LS1 f-body in the low tables,you stand a good chance of losing,i never lost to one in the high tables.
One thing that made me spit my coffee on my key pad,was launching at 3700rpms,if you try that on our track,you'll sit right at the line and spin like mad.Off idle or nothing on this track,unless you pay to join the pro-gas assoc,then pay the entry fee for a certain event,then they prep the track.I can only dream of a nice track....and take some of this humidity away..midnight and it's still 70% + humidity,we can't race during the day.
#22
TECH Senior Member
Originally Posted by H-5-L
Something to think about.I scan my car alot.I use 92 octane fuel.My car is always in the low octane tables.My buddy's 99 LS1 WS6 annivesary t.a. does not have this problem nor does my other f-body friend.
At the track,i used 92 octane,did not hear knock,but the timing was 21* across the RPMs,the run was 13.8 @ 101. (auto 3:15s-unprepped track)
At the track,i used 92 octane,did not hear knock,but the timing was 21* across the RPMs,the run was 13.8 @ 101. (auto 3:15s-unprepped track)
#23
7 Second Club
iTrader: (11)
Here's what I have learned with C5s + drag racing...
Auto:
Drag radials are fine, ET streets are better
3.90s are awesome
3800+ Stalls are not too big for the street
Hardened output shafts are a good idea but not necessary
6 Speed:
Drag Radials are your enemy(break too many parts)
ET streets are the hot ticket
Hardened output shafts are required
When you think your launching too high RPM add more RPM
Stock FE1 suspension kicks aruse
Z06 tranny gearing is better for 60'
Ram dual compound clutch is an awesome clutch
Ram 6 puck holds it all but is tough to drive smoothly
Aluminum flywheel is a great addition
Phil
Auto:
Drag radials are fine, ET streets are better
3.90s are awesome
3800+ Stalls are not too big for the street
Hardened output shafts are a good idea but not necessary
6 Speed:
Drag Radials are your enemy(break too many parts)
ET streets are the hot ticket
Hardened output shafts are required
When you think your launching too high RPM add more RPM
Stock FE1 suspension kicks aruse
Z06 tranny gearing is better for 60'
Ram dual compound clutch is an awesome clutch
Ram 6 puck holds it all but is tough to drive smoothly
Aluminum flywheel is a great addition
Phil
#25
TECH Senior Member
Originally Posted by Phil99vette
Here's what I have learned with C5s + drag racing...
6 Speed:
Drag Radials are your enemy(break too many parts)
ET streets are the hot ticket
Phil
6 Speed:
Drag Radials are your enemy(break too many parts)
ET streets are the hot ticket
Phil
This makes zero sense. How could you break more parts with drag radials than you would with the much stickier ET Streets??
#27
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Originally Posted by Patman
This makes zero sense. How could you break more parts with drag radials than you would with the much stickier ET Streets??
My shafts are all stock and I launch at 6800 rpm's on ET streets. I've never broken anything at the track.
#28
TECH Senior Member
I still don't buy it. You get much better 60fts with ET Streets or slicks, and believe me, even with the wrinkle effect your car has a lot more shock on it when you launch at high rpms on slicks/ET Streets than you can ever put on it launching much lower with DRs or street tires.
#29
7 Second Club
iTrader: (11)
The BFG drag radials are a very soft compound just like the MT ET streets. The drag radials being a normal radial tire that has almost 0 flex to a very very soft racing tire. The rubber band effect makes a world of difference. Since I have switched over to ET streets, I have cut faster, more consistent 60's than the drag radials. I have broken more parts that you can imagine on the BFG drag radials. Take my 2 years of experience or not, its up to you. I can guarantee you if you run drag radials and drag race your gonna be sorry in the long run. Been there done that.
#31
TECH Senior Member
"This makes zero sense. How could you break more parts with drag radials than you would with the much stickier ET Streets??"
One word....wheelhop. I've never busted an axle or rearend on ET Streets or slicks. I can't say that I've been as fortunate on DRs (I'm talking F-bodys here, btw, but the same should be true here.) I can attest that DRs are notorious for causing some pretty VIOLENT wheelhop on a great hooking track (especially violent when we're talking 1.5 60 fts and better.) This isn't the case with ETs or slicks. Those wrinkle walls do a good job of cushioning the initial hit and also of preventing wheelhop (ya gotta spin to hop you know.)
One word....wheelhop. I've never busted an axle or rearend on ET Streets or slicks. I can't say that I've been as fortunate on DRs (I'm talking F-bodys here, btw, but the same should be true here.) I can attest that DRs are notorious for causing some pretty VIOLENT wheelhop on a great hooking track (especially violent when we're talking 1.5 60 fts and better.) This isn't the case with ETs or slicks. Those wrinkle walls do a good job of cushioning the initial hit and also of preventing wheelhop (ya gotta spin to hop you know.)
#33
Staging Lane
Join Date: Nov 2001
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what PSI is best to run the ET streets at to prevent breaking parts? I just picked up a set to use at the track. Being a former F-body owner ('00 WS6) I'm not too confident in launching above 3000 rpm! Someone reassure me My C5 has 3.90's, 6 speed, cam, bolt-ons, etc...
#36
TECH Addict
iTrader: (1)
No one ever did answer the question of whether they make ET's in 18" sizes or not, unless I missed it. All other tech info is excellent. I have also been into drag racing a long time. However, not 2 years worth of nothing but a C5. This mans experience shouldn't be questioned. I myself have a 3200 stall Yank and stock runflats. What traction!! NOT!!! I am very interested in the answer to the 18" question. Thanks.
#37
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I have searched the MT site for the 18" and only see a 17". So I am going to say that they do not make an 18" Yet. To solve this I am looking for some Chrome Wagon wheels to mount the 17" ET streets to and swap rims when it is track time.
#38
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I have been to the track many times and with the Eagle f1 runflats I pulled a 1.94 sixty foot and a best et at 12.73 at 114. No wheel hop. Then just by switching Drag radials I ran a new best of 1.82 60 foot and dropped 3 tenths to run a 12.40 at 112 and average 12.40 -12.50s all day long. Again never had wheel hop. I launch the car at 4000 rpms regulary with the tire pressure dropped around 14.
I think I might take some of the regular track ****** who go all the time advice and see whats the magic in the ET Drags.
I think I might take some of the regular track ****** who go all the time advice and see whats the magic in the ET Drags.
#39
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Originally Posted by grinder11
No one ever did answer the question of whether they make ET's in 18" sizes or not, unless I missed it.