D series Drivetrain mods and effects.

[Aquafina]

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. I don't know the power of the engine but I've had it for over 2 years now. Every day I've driven it it has seen the red line a couple of times. I'd be surprised if it made 70whp on a dynojet, which I plan on getting it dyno'd next month for a before/after comparison with the Y8 manifold open and custom SMSP header open. I will also do a comparison at the strip for the 2 manifolds. As for now I am putting in a 1.066 VX 3rd gear for 4th gear so hopefully that won't make me too much slower. I'm going to play around with the gearing before I do anything else to the engine. I'll either go 4.928 final drive and .878 5th gear or keep the 4.71 and see what it does with the Infinitude close gear set. I'll probably get an SAFC once I get the header so I can have the A/F adjusted on the dyno, I'll use that to raise the rev limit to 7,200. I might throw the 1.172 back in for 4th just for a comparison if I can get my 60' down. I will also be changing over to an EX case and use the EX 2nd gear as Quaife no longer makes a diff for the small bearing cases. For now that is all. The monster in all its stock D16Y7 glory.

This ad is not displayed to registered or logged-in members. Register your free account today and become a member on Honda-Tech!

[Aquafina]

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.

[Aquafina]

Ran it this past Tuesday. Humid and hot as hell so I don't like posting the results but its what I got. Don't know if its the tire pressure or weather or even just the gear spacing but I didn't really like the EX trans with the 4.7. Fun as hell to drive, but I was hitting 4th right before the line. Tried it in 3rd but bounced it and added .14 to my time and took 5mph off my trap. Played around with tire pressures this time too.


40psi warm
2.45 60'
1/8 - 10.680 @ 64.86
1/4 - 16.759 @ 80.10

15psi warm
2.312 60'
1/8 - 10.555 @ 64.26
1/4 - 16.722 @ 78.40

I was much happier with the 15 psi runs but I think 2x would have been the key. It just felt slow on 15psi. No burnouts, no quick spins to clean debris off either.

SMSP header is on right now so I'll have a before/after time for that next time I run. Whenever I get the close gearset in I'll change it back to stock.