Another guess my 1/4 times post

[Anonymous]

The replacement crossflow is on its way, so I have a little more time to think about things like this. Just thought it would be fun to get some HP and 1/4 mile times on my car when done.

250 Crossflow.20 over
full balance
9:2 CR
C4 with 3.00 rear
headers
redline 2v intake
roller rockers
cam will be stock or crow 14776
electric fan


In a 68 Mustang

 

[Anonymous]

14.2

 

[gassed250]

16-17

 

[addo]

Weight with driver? What are your reactions like? Tyres? T-5 or C-4?

I'd say high 16's/17-ish but coming down with practice and tweaking.

 

[TCSTEVE]

15.8 ET
85mile time

 

[xctasy]

Mild 25/65 cams like that and a 2-bbl in the 320 to 350, or 500 cfm range at 3"Hg give 250 x-flows excellent power.

Stock BW 35 and C4 autos are very good at loosing lots of power unless shift kitted. They loose about 0.5 secs over the quarter over a manual. If a Transgo shift kit is added, you'll get that half second back easily. With a kit, a C4 will never glide from gear to gear like a stocker, but it'll last a long, long time.

Headers liberate 18% more power, and improve open road steady state economy 18% too!.

Most unemissionised XE ot XF Falcons in New Zealand with stock 2-bbl Weber gave 140 bhp net, so with a better intake, cam and header the target figure of 196 bhp is possible with the 500 cfm 4412 carb. This is a figure reported by Dick Johnston's SVO developement engineer in Feb 1987. It was what an unemissionised XF engine gave with a 280 degree 30/70 cam and a better intake system and exhast.

If your car can get close to 196 hp, and is under 3000 kg (1367 kilos), with the driver, and you have a shift kit with a 3.00:1 diff, then you will have a 14.7 second car.


For your Info:-

Wheels Magazine figures from 1979 to 1986 figures.

Stock Falcons weighed, unleaden, no driver, half a tank of gas.
Cars were tested two up, (180 kilos gets added to figures below) , in both directions, average of three runs, with Lietz Correvit timing gear, at close to sea level in warm weather.

1979-1980 XD about 1367 kilos as a 3.3, 1450 kg all power options 4.1
Quarter miles were 18.6 sec 4.1 auto with a/c at 1390 kilos, 2.92:1 diff
1979-1980 XD.1/2.about 1343 kilos as a 3.3, 1424 kg all power options 4.1, 2.77:1 diff Quarter miles were 18.2 sec 4.1 auto with a/c at 1390 kilos
1982-1984 XE about 1320 kilos as a 3.3, 1483 kg as a loaded EFI 4.1
Quarter miles were 3.23:1 diff 17.9 sec 3.3 5-speeds with 1320 kilos, while the 4.1 auto with a/c at 1483 kilos, 2.77:1 diff was 18.0 secs. With 4-speed , 2.77:1 diff 4.1 with p/s, 17.6 sec, 1400 kilos With EFI added, 2.92:1 diff, 16.9 secs and 1435 kilos to lug around.
1984-1988 XF about 1400 kilos as a 3.3,The 1575 kg as a loaded EFI 4.1 with 2.77:1 diff gave 1
Stock 3.3 2.92:1 diff, gave 18.0 sec as 4-speed, 4.1 auto, ps, a/c, 2.77:1 diff, gave 17.9 secs. Auto 4.1 EFI ps, a/c in a sedan (1525 kilos) gave 17.4 secs. 4.1 S-pack EFI, 2.77:1 diff, gave 16.3 second quarters with p/s, no a/c.

 

[addo]

The Crow 14892 might be closer to that 30/70 spec, X. Especially if he's going to compromise on rockers for now.

Designed to give maximum performance and driveability in street modified engines.

Sound about right?

 

[Anonymous]

xTaxi is like Rainman!
I know it's simple (fairly) math, but I bet he just snaps it out of his head!

Ooh, my turn my turn....guess mine too!

(specs in sig)
+ 3.50 rear gears
Existing Ford-O 2 speed
13" tires
good reaction times (I'm pretty young still 8) )

Now, tell me what i can do when the kitted C4 goes in in a week or two.

 

[xctasy]

xTaxi is like Rainman!
I know it's simple (fairly) math, but I bet he just snaps it out of his head!

Ooh, my turn my turn....guess mine too!

(specs in sig)
+ 3.50 rear gears
Existing Ford-O 2 speed
13" tires
good reaction times (I'm pretty young still 8) )

Now, tell me what i can do when the kitted C4 goes in in a week or two.

'63 Falcon Futura Convertible
200 bored .020 @ 9.7:1CR
OZ2502V Head/Intake w/Holley 2300 500CFM
264/274 cam, full roller rockers
double roller timing, HiPo Dampner
Dual-out Pacemaker Headers
DSII/MSD Ignition

The information is alread here on the forum from kastang and Mustangaroo. The 2V head, exhast, carb with the stock came gives over 105 hp at the rear wheels. The engine is very 'cam limited'.

The bigger head with the stock 2 stage auto will be no worse off than with the old log head in terms of off the mark acceleration.

When you add a cam with more duration and fail to add a ratio, it just dies. If you were able to build it like a power glide and a set of 4.11:1's, it would be okay, but not with the stock slush box and 3.5:1, sorry.

The 264/274 needs the 3.5:1's, and I don't thinks it is workable with the tall first of the stock 2-stage. Driving an over tall first gear with a stock converter and a wild cam is not an experience anyone will enjoy.

Adding the three stage will turn it from a undrivable mess to a real nice machine.

Okay, 105 rwhp (141 hp/105 kW net) with a stock 8.5:1 compression Mustang, and with a cam, there is another 25% or more power . That's 175 hp/ 130 kW net. That's with the cam phaseing, mixtures, plugs and ignition sorted.

With only 2650 lb (1200 kilos with the rider included), then you have a 15.7 sec machine. With an agressive shift kit and maybe a 2300 rpm stall, you'd have low 15.2's.

if you want further reading, Re-read Jacks Engine Analyser write up from way back in 2004. This is where ther log is a dog phrase got coined. And read the Virtual Reality Drag post inthe Hardcore section from 2003 shows you how the power calces are done.

 

[SONNY]

i had a transgo shift kit in my c4 (250 c4 te cortina)and it was real good.it used to squeel into second evey time also had an oil cooler and inline filter.they do take off good