So say 2500lbs 170ft/lbs and 4:44 final drive. What's that calculation again? Gear ratios I'll have to look up.

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Gone fishing

david amor Wrote:
-------------------------------------------------------
> If we get the car under 2500lbs it'll be a
> monster. You cannot add ANYTHING to a FIA cage.
> For the Impreza it has a gusseted x in the door,
> the down tube behind the A pillar and an X in the
> roof. What it doesn't have is sill bars, X in main
> hoop or harness bar. You just cross the belts and
> attach to the rear strut tower bar. Safe as a 253
> cage? probably not. Safe enough for me, yup. And
> light as hell which is the whole point of this
> car.
>



The Custom Cages diagram, and the photos I've seen show no gusseting except at the dash, no attachment to the shell except at the feet and strut towers, a single diagonal in the roof, no sill bar, no FIA bar, no dash bar, no harness bar and no "X" in the main hoop. Here's a pic of the '95 coupe cage. Even the sedan cage from the GC8 has more bars.

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Jason McDaniel



Edited 1 time(s). Last edit at 01/14/2010 01:41PM by modernbeat.

The issue I have with the lack of a harness bar is long shoulder straps that don't work well with a HANS. Long belts stretch more, and can come off the HANS device easier and leave the belts slack after the slip off the HANS.

On the gearing, we're building two cars. One with heavier STi parts that will eventually see a turbo motor, and a lighter car with Forester parts and 4.444 gearing.

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Jason McDaniel

david amor Wrote:
-------------------------------------------------------
> So say 2500lbs 170ft/lbs and 4:44 final drive.
> What's that calculation again? Gear ratios I'll
> have to look up.
>
> "this is certainly not a game for flyweights or
> ping-pong players-all arguments to the contrary"
> -C.B.


Multiply torque x gear ratio x final drive.

Do it each gear.

Try it! It's fun.

Say a nice simple car like the 2300 turbo Xratty or Volvo.
Easy to do 275 ft-lbs （after all the stock T-bird gets you 235 ft/lbs with stock everything including weeenie exhaust)

So 275 ft/lbs x 1st gear 2.95 times our fave final drive 4,3=3489 ft/lbs at the wheels (add car weight of say 2850 with crew and a bit of gas).

Try 4th 1:1....275 x 1 x 4.3= 1182 ft/lbs


Now look at the normal aspirated cars, choose a nice old school one to see the effect of weight

A good NA 2,0 will make maybe 175-180 ft/lbs max so look at the ratios
175 x 2.3 x 5.1 = 2052 t/lbs in first and think say 2375 lbs
in top gear 175 x 1 x 5.1 = 892 ft/lbs in top

Not DRASTICALLY less like the horsepower differences are.

Sure the turbo motor makes more torque but correct gearing can make up for a lot.

And wrong gear will fuck you up badly in a normal aspirated as will WEIGHT.

Any of this clear?

---

John Vanlandingham
Sleezattle, WA, USA

Vive le Prole-le-ralliat

www.rallyrace.net/jvab
CALL +1 206 431-9696
Remember! Pacific Standard Time
is 3 hours behind Eastern Standard Time.

modernbeat Wrote:
-------------------------------------------------------
> david amor Wrote:
> --------------------------------------------------
> -----
> > If we get the car under 2500lbs it'll be a
> > monster. You cannot add ANYTHING to a FIA
> cage.
> > For the Impreza it has a gusseted x in the
> door,
> > the down tube behind the A pillar and an X in
> the
> > roof. What it doesn't have is sill bars, X in
> main
> > hoop or harness bar. You just cross the belts
> and
> > attach to the rear strut tower bar. Safe as a
> 253
> > cage? probably not. Safe enough for me, yup.
> And
> > light as hell which is the whole point of
> this
> > car.
> >
>
>
>
> The Custom Cages diagram, and the photos I've seen
> show no gusseting except at the dash,

Optional

no
> attachment to the shell except at the feet and
> strut towers, a single diagonal in the roof,


Optional and optional


no
> sill bar, no FIA bar, no dash bar, no harness bar
> and no "X" in the main hoop.

I said that here ^ If by "FIA bar" you mean the down tube behind the A-pillar, the sedan has it.


Here's a pic of the
> '95 coupe cage. Even the sedan cage from the GC8
> has more bars.

One more reason why a coupe is not practible for a rally car. Mines a proper 4 door.

>
>
> Jason McDaniel
>
>
>
> Edited 1 times. Last edit at Jan 14, 2010 by
> modernbeat.

---

Gone fishing



Edited 1 time(s). Last edit at 01/14/2010 02:41PM by david amor.

john vanlandingham Wrote:
-------------------------------------------------------
> david amor Wrote:
> --------------------------------------------------
> -----
> > So say 2500lbs 170ft/lbs and 4:44 final
> drive.
> > What's that calculation again? Gear ratios
> I'll
> > have to look up.
> >
> > "this is certainly not a game for flyweights
> or
> > ping-pong players-all arguments to the
> contrary"
> > -C.B.
>
>
> Multiply torque x gear ratio x final drive.
>
> Do it each gear.
>
> Try it! It's fun.
>
> Say a nice simple car like the 2300 turbo Xratty
> or Volvo.
> Easy to do 275 ft-lbs （after all the
> stock T-bird gets you 235 ft/lbs with stock
> everything including weeenie exhaust)
>
> So 275 ft/lbs x 1st gear 2.95 times our fave final
> drive 4,3=3489 ft/lbs at the wheels (add car
> weight of say 2850 with crew and a bit of gas).
>
> Try 4th 1:1....275 x 1 x 4.3= 1182 ft/lbs
>
>
> Now look at the normal aspirated cars, choose a
> nice old school one to see the effect of weight
>
> A good NA 2,0 will make maybe 175-180 ft/lbs max
> so look at the ratios
> 175 x 2.3 x 5.1 = 2052 t/lbs in first and think
> say 2375 lbs
> in top gear 175 x 1 x 5.1 = 892 ft/lbs in top
>
> Not DRASTICALLY less like the horsepower
> differences are.
>
> Sure the turbo motor makes more torque but correct
> gearing can make up for a lot.
>
> And wrong gear will fuck you up badly in a normal
> aspirated as will WEIGHT.
>
> Any of this clear?
>
> John Vanlandingham
> Sleezattle, WA, USA
>
> Vive le Prole-le-ralliat
>
> www.rallyrace.net/jvab
> CALL +1 206 431-9696
> Remember! Pacific Standard Time
> is 3 hours behind Eastern Standard Time.

Easy! just gotta get the serial # from the 2 trannies to check the gear ratios

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Gone fishing

Dave...

look here. http://spda-online.ca/modules/tinycontent/rewrite/tc_28.html

---

Chris

Thanks!
So first gear 2327ft/lbs
second gear 1556ft/lbs
third gear 1166ft/lbs
fourth gear 868ft/lbs
fifth gear 623ft/lbs

Man I wish I had shorter gears

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Gone fishing

dave what are you assuming for torque?

And i'm guessing your working with a 4.44??

Heres what i just calced on 4th gear in my trans

350 tq x 1.346 (4th gear) x 3.9 = 1837 ft/lbs


I think for the N/A motor, you need a JDM 6 spd, with a 4.44 behind them. You'd top out pretty quick though... And the 6 speeder is heavier.

As is with the 3.9 is 215ish KPH at 6 grand.


It would be a PILE of fun.

2.5L motor, with a pile o compression, hot cams/springs/valves, and Quad throttle bodies. The noise...oh man the noise. my guess is 230 hp and about 200 tq at the crank.

the 6 would be a pile of fun as well..but again...heavier.

I wanna see you do it!

---

Chris

Haha no 6 speed, not enough power to break a 5 speed! But yeah 4:44 X2 is still cheaper than the 6 speed (and technically that gives me a 10 speed!!!)

BUT........

Depending on who's driving it, with fully optimized brakes, diffs and suspension this car could still win any regional in the country. Hell even YOU could win a regional in this car!

PS: contact me about sponsorship stuff.

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Gone fishing