Gearing affects on 1/4 mile for a single cam.
08-25-2008, 09:48 PM
#1
Gearing affects on 1/4 mile for a single cam.
Just reposting all this info in a new thread. Less clutter to read through. Any questions ask away.
1996 Civic DX hatchback
current mods
removed spare tire and tools
full interior
still have A/C
5-lug (weight adder)
Y8 exhaust manifold, no exhaust
Action Clutch 1MD clutch (6-puck)
Fidanza 7.5 pound flywheel
Omni Power Clutch Master Cylinder, prototype revised version, thanks Omniman
stock 1,2,5 gears
ZC 3rd
stock 3rd 1.172 for 4th gear
SRR 4.71 final drive
2,340 pounds with me in it and a 1/4 tank
All runs made at Bristol Motor Dragway on 205/50/15 Azenis.
Stock car with 5-lug, 34'ish psi, averaged 17.7
17.584 @ 76.53
2.478 60'
1/8 - 11.178 @ 62.49
no back seats or 1/4 panels, averaged 17.4 (best was 17.1 but I can't find the slip)
no muffler (still had piping, still on Y7 manifold)
34'ish psi
clutch and flywheel
17.339 @ 76.63
2.511 60'
1/8 - 11.035 @ 63.18
with mods first listed, averaged 16.55
16.412 @ 80.90
2.316 60'
1/8 - 10.407 @ 66.29
I was going to do some comparison runs of ZC 3rd vs stock 3rd, but the track got busy and I didn't have time. As it is right now I top 4th out at 82mph, so with a better 60' I would need a higher rev limit to keep me from having to go to 5th. I'm sure with more track time I can get it down to a 16.1 or so.
Launches were at 5,500-6,000. Spinning then hopping. Tires were at 39psi after a couple minutes of cooling (never checked them before running). The CMC allows me very quick shifts so I don't think skipping 3rd and going straight to 4th would make me any faster, slower if anything.
-----------------------------------------------------------------
Ran it at Bristol again this past Thursday.
Tires were at 28 psi, changes were a 1MD clutch versus a 1MS (same pads, but disc is lighter due to no springs, 1MS disc had lots of life left in it but I destroyed the pressure plate, pics later). Put an EX trans it it since I destroyed the Y7 trans (crossthreaded interlock guide bolt and it came out). Also put the Y7 exhaust manifold back on, still no exhaust. Low end power feels a lot better with it, more sluggish in the top end. But definitely quieter. No more turning up the radio all the way to hear it. Also, the EX 2nd gear feels nice. Overall the EX trans is pretty nice, but the gears are still way too long as you can see by my new times. Never hit 4th with it. Only got 3 runs in.
Best was:
1/4 - 16.822 @ 78.91
2.418 60'
1/8 - 10.651 @ 64.22
Was launching and half slipping the clutch, no pre-load. Would drop to 5,000 and spin through 1st, no wheel hop.
-------------------------------------------------------------------------------
Ran it today at the season opener. Got 3 runs in. Left my Azenis out over winter so I don't know if thats where my traction problems were coming from or if it was just the weather or track (was mid-upper 50's).
Changes:
Azenis in front on Slips
CRV's in back on Ziex (45psi)
kept spare Slip/Azenis in hatch
Adjusted valve lash tighter than OEM spec on IN, tighest OEM spec on EX (do a valve lash day before each event I do)
removed AC belt
SMSP big tube header
SMSP race exhaust
Best run
2.719 60'
1/4 - 16.043 @ ??? (mph was sporadic most of the day)
1/8 - 10.942 @ 66.53
2nd
2.522 60'
1/4 - 16.386 @ 184.47
1/8 - 10.491 @ 67.36
(couldn't figure out why this run was slower being I had a better launch and 8th)
3rd (last)
2.500 60'
1/4 - 16.298 @ 83.52
1/8 - 10.450 @ 67.78
Gearing setup was stock EX with SRR 4.71 FD.
----------------------------------------------------------------------------
Running it tonight. A lot of changes.
Z6 longblock, didn't do a valve adjustment since I put it in. I don't know how long its been since its had one. Has about 140k on it. Threw a rod in the Y7 LX/VTEC (Z6 head) so this was a quick replacement. Stock P28. Generic short ram (Z6 IM/TB). SMSP big tube/race exhaust.
For the trans...
Back to the OEM CMC.
New OEM slave cylinder.
Stock EX FD.
MFactory close gear set with 1.259 4th.
Won't have a spare in the back this time. The Azenis I'll be running up front are bald and old so I don't know how good they'll grip. I'll post results tonight when I get home from the strip.
...
Not happy at all.
Had a CEL come on on the way to the strip. No VTEC.
Lost the exhaust donut so I almost debated even putting the header on. I went ahead and put it on, no exhaust.
bald and cracked Azenis in front so I'm sure they didn't do any good.
No exhaust hurt the midrange pretty bad, which is where I was after shifting.
Full size spare in the back.
60' - 2.418
1/8 - 10.240 @ 68.05
1/4 - 16.029 @ 84.88
On this run I felt like the power was dropping off in 4th so I put it into 5th and missed.
60' - 2.611
1/8 - 10.541 @ 67.91
1/4 - 16.483 @ 79.71
60' - 2.505
1/8 - 10.417 @ 68.33
1/4 - 16.194 @ 84.87
All in all not too bad I guess. The LX/VTEC felt a lot better before it blew. The new engine just doesn't feel like it has as much *****. Not sure what the Z6 primary specs are, but I think powerwise (with VTEC not working) it was actually a little less than the stock Y7 was with the header and exhaust.
1996 Civic DX hatchback
current mods
removed spare tire and tools
full interior
still have A/C
5-lug (weight adder)
Y8 exhaust manifold, no exhaust
Action Clutch 1MD clutch (6-puck)
Fidanza 7.5 pound flywheel
Omni Power Clutch Master Cylinder, prototype revised version, thanks Omniman
stock 1,2,5 gears
ZC 3rd
stock 3rd 1.172 for 4th gear
SRR 4.71 final drive
2,340 pounds with me in it and a 1/4 tank
All runs made at Bristol Motor Dragway on 205/50/15 Azenis.
Stock car with 5-lug, 34'ish psi, averaged 17.7
17.584 @ 76.53
2.478 60'
1/8 - 11.178 @ 62.49
no back seats or 1/4 panels, averaged 17.4 (best was 17.1 but I can't find the slip)
no muffler (still had piping, still on Y7 manifold)
34'ish psi
clutch and flywheel
17.339 @ 76.63
2.511 60'
1/8 - 11.035 @ 63.18
with mods first listed, averaged 16.55
16.412 @ 80.90
2.316 60'
1/8 - 10.407 @ 66.29
I was going to do some comparison runs of ZC 3rd vs stock 3rd, but the track got busy and I didn't have time. As it is right now I top 4th out at 82mph, so with a better 60' I would need a higher rev limit to keep me from having to go to 5th. I'm sure with more track time I can get it down to a 16.1 or so.
Launches were at 5,500-6,000. Spinning then hopping. Tires were at 39psi after a couple minutes of cooling (never checked them before running). The CMC allows me very quick shifts so I don't think skipping 3rd and going straight to 4th would make me any faster, slower if anything.
-----------------------------------------------------------------
Ran it at Bristol again this past Thursday.
Tires were at 28 psi, changes were a 1MD clutch versus a 1MS (same pads, but disc is lighter due to no springs, 1MS disc had lots of life left in it but I destroyed the pressure plate, pics later). Put an EX trans it it since I destroyed the Y7 trans (crossthreaded interlock guide bolt and it came out). Also put the Y7 exhaust manifold back on, still no exhaust. Low end power feels a lot better with it, more sluggish in the top end. But definitely quieter. No more turning up the radio all the way to hear it. Also, the EX 2nd gear feels nice. Overall the EX trans is pretty nice, but the gears are still way too long as you can see by my new times. Never hit 4th with it. Only got 3 runs in.
Best was:
1/4 - 16.822 @ 78.91
2.418 60'
1/8 - 10.651 @ 64.22
Was launching and half slipping the clutch, no pre-load. Would drop to 5,000 and spin through 1st, no wheel hop.
-------------------------------------------------------------------------------
Ran it today at the season opener. Got 3 runs in. Left my Azenis out over winter so I don't know if thats where my traction problems were coming from or if it was just the weather or track (was mid-upper 50's).
Changes:
Azenis in front on Slips
CRV's in back on Ziex (45psi)
kept spare Slip/Azenis in hatch
Adjusted valve lash tighter than OEM spec on IN, tighest OEM spec on EX (do a valve lash day before each event I do)
removed AC belt
SMSP big tube header
SMSP race exhaust
Best run
2.719 60'
1/4 - 16.043 @ ??? (mph was sporadic most of the day)
1/8 - 10.942 @ 66.53
2nd
2.522 60'
1/4 - 16.386 @ 184.47
1/8 - 10.491 @ 67.36
(couldn't figure out why this run was slower being I had a better launch and 8th)
3rd (last)
2.500 60'
1/4 - 16.298 @ 83.52
1/8 - 10.450 @ 67.78
Gearing setup was stock EX with SRR 4.71 FD.
----------------------------------------------------------------------------
Running it tonight. A lot of changes.
Z6 longblock, didn't do a valve adjustment since I put it in. I don't know how long its been since its had one. Has about 140k on it. Threw a rod in the Y7 LX/VTEC (Z6 head) so this was a quick replacement. Stock P28. Generic short ram (Z6 IM/TB). SMSP big tube/race exhaust.
For the trans...
Back to the OEM CMC.
New OEM slave cylinder.
Stock EX FD.
MFactory close gear set with 1.259 4th.
Won't have a spare in the back this time. The Azenis I'll be running up front are bald and old so I don't know how good they'll grip. I'll post results tonight when I get home from the strip.
...
Not happy at all.
Had a CEL come on on the way to the strip. No VTEC.
Lost the exhaust donut so I almost debated even putting the header on. I went ahead and put it on, no exhaust.
bald and cracked Azenis in front so I'm sure they didn't do any good.
No exhaust hurt the midrange pretty bad, which is where I was after shifting.
Full size spare in the back.
60' - 2.418
1/8 - 10.240 @ 68.05
1/4 - 16.029 @ 84.88
On this run I felt like the power was dropping off in 4th so I put it into 5th and missed.
60' - 2.611
1/8 - 10.541 @ 67.91
1/4 - 16.483 @ 79.71
60' - 2.505
1/8 - 10.417 @ 68.33
1/4 - 16.194 @ 84.87
All in all not too bad I guess. The LX/VTEC felt a lot better before it blew. The new engine just doesn't feel like it has as much *****. Not sure what the Z6 primary specs are, but I think powerwise (with VTEC not working) it was actually a little less than the stock Y7 was with the header and exhaust.
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