Crappy quarter mile results, thank you shit gearbox

Vova

Did some testing a time ago. Results for acceleration were shit. Gear-shifting from 1st to 2nd takes about 1.4 seconds! 2nd to 3rd is about .7 seconds. Tires proved to be pretty good though, happy with 1g cornering (low speed test).

We measured a few M3's and other cars, they all shift within .5 or less seconds (E92 M3 40ms lol), which significantly cuts down their times. Than, there is also something strange, when shifting into 2nd, the car bogs down and doesn't accelerate smoothly. I'm thinking this is the lag that develops from the long shift-time and the engine can not get up to speed fast enough to overcome decelerating forces from nature.

Or maybe I just suck..

9 oktober 2010 – 01:00 – 10c ambient

Falken FK452
PFC01
Stage II ~255HP (oem exhaust)
1.09BAR
1260Kg + 80kg (dri) + 60kg (pass)

Brakes: 1.11g
Lateral: 1.02g (low speed)
Accel: 0.61g
0-100: 7.95
1/4 mile: 15.39@152KM/h

**mejdan22**

Zitat von Vova

0-100: 7.95

really? youre slower than a std. s13

NightKid

maybe u need more torque
u could try a short shifter from ikeya like this one

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guru.potzblitz

.. or maybe the clutch is unable to handle the Power? What kind of clutch are you using?

btw: I was able to burn down a 0-100km/h time of 6.92 sec with a Stock S13 on 15" wheels with a 2.7" Catback and k&n plate-filter (Boost was around 12 PSI).
This time was captured by Dynolicious too, but I forgot to save the graph

Vova

The shifter nor the clutch is the problem, the problem is the syncromesh, which engages very slowly. 6.95 on a stock S13 is hard to believe.

TurboGrinch

Zitat von NightKids

maybe u need more torque
u could try a short shifter from ikeya like this one

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does it come with new synchros? nope, so it cant make shifting faster

guru.potzblitz

Vova: If you need new synchro's, go for it

rusty racer

Maybe you should upgrade your Gearbox with some new cool solid parts from PPG Or if you wanna go the hard way, invest into a dogbox.

When shifting from first to second, do you stay a little bit on the gas? Maybe this might be a little bit helpful.

MfG rr

P.S I know, my english is bad

endee

Do you have new Engine Mounts installed, or the original 13 years old Marshmallow Mounts? The old Mounts are to soft and the Engine moving to much from side to side at full throttle with fast shifting. New Mounts and/or a Engine Damper is the solution for this problem. I have a engine Damper in my old S13 with old engine Mounts and fast shifting works very well!

Vova

How would rotation of the engine-gearbox assembly influence synchromesh engagement?

TurboGrinch

Zitat von Vova

How would rotation of the engine-gearbox assembly influence synchromesh engagement?

it doesnt, but it helps you to get into gear, because when everything is twisting you´re often not 100%ly in pattern.

Vova

Hmm.. how do you mean 'in pattern'?

BuLL3T

I think he means..smashing the gearstick against the natural barrier between for example gears 1 and 3
Another bad thing with rotating engine-gearbox assembly might be a noticable difficulty in "getting the gears off"..if you understand what I want to say