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Old 08-08-2004, 01:17   #1 (permalink)
1974 xl tc 250 cortina
 
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Please give me a 1/4 mile estimation.

Alright can you guys please tell me what this set up will pull down the 1/4?

1974 TC Cortina, alloy head crossflow, straight LPG turbo, to4, intercooler, gas research carb, custom intake plenum. 330rwkw, 1100nm.

2.77 diff, c4 full manual.

What times do you recon that'd do with street tyres vs. slicks?

Thanks
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Old 08-08-2004, 01:26   #2 (permalink)
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Re: Please give me a 1/4 mile estimation.

street tyres vs slick is hard to say, depends on how much power you have and when it comes on What sort of rwkw are you looking at (it can vary quite a bit based on turbo psi) and what sort of weight is the corty?
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Old 08-08-2004, 01:45   #3 (permalink)
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Re: Please give me a 1/4 mile estimation.

Quote:
Originally Posted by Casper
street tyres vs slick is hard to say, depends on how much power you have and when it comes on What sort of rwkw are you looking at (it can vary quite a bit based on turbo psi) and what sort of weight is the corty?
oops forgot about the weight. Its listed as 1100kg but at the weigh bridge the other day it was 1320kg with me and an lpg system included.

Yeah I sorta thought there would be way too many variables. But any ballpark sort of estimation is welcome.

I will have the power I listed above (330 rwkw+) and it will come on with some boost at 2000, then full boost (lets say 15psi for now) at 3000, then rev through to 5400 or thereabouts.
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Old 08-08-2004, 01:56   #4 (permalink)
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Re: Please give me a 1/4 mile estimation.

Well, getting 330rwkw out of a 4.1 is going to be an expensive exercise but, based on those numbers, I'd guess hight 10's or low 11's. That is if it doesnt do a 1/4 mile burnout everytime. Road tyres with that amount of power is pointless, you will need slicks....BIG ones too!
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Old 08-08-2004, 02:05   #5 (permalink)
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Re: Please give me a 1/4 mile estimation.

Quote:
Originally Posted by Casper
Well, getting 330rwkw out of a 4.1 is going to be an expensive exercise but, based on those numbers, I'd guess hight 10's or low 11's. That is if it doesnt do a 1/4 mile burnout everytime. Road tyres with that amount of power is pointless, you will need slicks....BIG ones too!
Depends what you call expensive. I am sure it can be done for under 10,000, (maybe even 6-8) for just the motor. Which I recon isnt all that bad.

Is that high 10's low 11's with street tyres? What could I get to with slicks? I would love to go sub 10.
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Old 08-08-2004, 02:07   #6 (permalink)
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Re: Please give me a 1/4 mile estimation.

forget street tyres for a 1/4 run, you'll just make a lot of rubber smoke. That sort of power will need BIG slicks if you want to stay connected to the track.
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Old 08-08-2004, 02:12   #7 (permalink)
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Re: Please give me a 1/4 mile estimation.

I figured that might be the case (with the wheelspin) but I would still love to go for a "full street trim" time.

Do you recon I'd be good for a high nine with slicks?
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Old 08-08-2004, 02:15   #8 (permalink)
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Re: Please give me a 1/4 mile estimation.

Isn't 2.77 a very low diff ratio? Wouldnt around 4 be better for acceleration?
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Old 08-08-2004, 02:26   #9 (permalink)
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Re: Please give me a 1/4 mile estimation.

Quote:
Originally Posted by XRSIK
Isn't 2.77 a very low diff ratio? Wouldnt around 4 be better for acceleration?
Nah apparently because of the gobs of torque produced, going anything higher than a 3.08 is very difficult to drive on the street due to wheelspin. Maybe the 4.11 would be better at the strip but I gotta drive it on the road too, so its not really an option for me.

Your right the 2.77 is probably too tall for maximum effeciency on the 1/4, but I cant stand high revs at 100k on the street.

And this might be bulls#!t, but I recon the 2.77 might be better for spooling the turbo at lower revs due to the tall gearing putting more of a load on the motor.
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Old 08-08-2004, 05:37   #10 (permalink)
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Re: Please give me a 1/4 mile estimation.

According to Virtual Engine Calculator 2003, 10.62 @ 126.7mph in totally perfect conditions.

Of course, this should be taken with almost no seriousness, its about as accurate as spitting into wind.
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