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Old 07-28-2003, 01:44   #1 (permalink)
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What 1/4 can i expect?

I am wondering what type of 1/4 mile i should expect. My car weighs 1130kg or prob 1200 max with the v8 conversion, i should have at least a good 400-430bhp. Btw its a boss 302.
People with the 3.0L toyota tt motors are running 300rwhp and a 12.7 1/4 mile. Surely the 8 has a lot more grunt off the line? Over 400m will they catch up? This is a good topic as its hard to gauge a turbo vs big cc motor race. Admittedly when the turbos kick in it feels like you've been shot up the ass, but they lack low down grunt, unlike the v8...surely the 8 is better around streets racing?

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Old 07-28-2003, 02:05   #2 (permalink)
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Re: What 1/4 can i expect?

given perfect power to weight you would be looking at low 11s high 10s with the power to weight you propose.
However, a genuine 400-430 hp 302 windsor is going to be a very grumpy motor and you will be running a very high stall with low gears to get the times you want. Most factory turbos have the low gearing to start with as the motors tend to be smaller and revvier.
Force fed motors can have the advantage of being a bit doughy when you want to beetle around ( I wouldnt want it, just passing win.. comment).
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Old 07-28-2003, 02:09   #3 (permalink)
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forgot to mention its gonna be changing from the 3.9 ratio to a 3.5 - The 3.9 would be too wild for my everyday driver!
Well as far as the 1/4 goes..a fella i know has a capri with a 351c n/a worked to the thunderbox, and it runs a 9.7 Its got about 450hp i think. No idea how much the capri weighs...
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Old 07-28-2003, 02:14   #4 (permalink)
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Re: What 1/4 can i expect?

a capri will weigh a lot less I would be guessing.
I changed the diff ratio in my old xb from 3.0 to 4.11 once and it was actually easier for me to drive.
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Old 07-28-2003, 03:01   #5 (permalink)
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Re: What 1/4 can i expect?

i reacon about mid 13's depends on the tyre combo
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Old 07-28-2003, 03:09   #6 (permalink)
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Re: What 1/4 can i expect?

found my moroso slide rule so I will change my story a bit.
assuming 1200ks (2700ish lbs) and ( genuine ) 400 Hp, a perfect run would be 10.6 @ 124. The perfect run will never happen so low 11's would be realisitic assuming traction etc etc.
but
I feel that a supra will weigh more than that, I may well be wrong but a supra is not a small car.
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Old 07-28-2003, 03:11   #7 (permalink)
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If you stall the engine up high and have a good set of slicks i'd say mid-low 11's. Street tyres in the high 11's. If your building the 302 to make that kind of power its gonna be a high RPM engine. 400+ HP is going to mean poor torque, especially in a 302.

Stick with the 3.9's, you'll need 'em.
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Old 07-28-2003, 04:57   #8 (permalink)
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yeah but something is wearing out in my diff - used to make a clunk when u go to let the clutch out - expected at 282km. Box needs new synchro rings....so i was gonna change ratio while i was at it..the 83 supra is only a 2 dr coupe...i mean a luxurious sports car, with irs/ 4w db's, lsd, p/s....but its tiny in comparison to a family sedan..1130kg is what it reads on my engine plate - so im going off that! ...the 86-92 model was heavier (1400kg or something) But had the 3.0L turbo to make up for it...and they flew if worked well and the Head gasket problems were solved.
it will also do a bit of highway driving, so 3.9 is pretty impractical. you say it will lack torque? HOw so!?
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Old 07-28-2003, 07:06   #9 (permalink)
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Re: What 1/4 can i expect?

Your better off dropping a late model Supra engine in it, not only will it be cheaper, but you can extract alot more hp easily than from a N/A Windsor.
Plus there will be atleast an extra 50kg over the front wheels which wont do the handling any favours.
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Old 07-28-2003, 14:38   #10 (permalink)
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Re: What 1/4 can i expect?

Quote:
Originally Posted by 302_supra
it will also do a bit of highway driving, so 3.9 is pretty impractical. you say it will lack torque? HOw so!?
If your happy with the amount of RPM's your engine is turning now, it will be exactly the same with a V8. With the overdrive 5th it should be fine

To get 400+ HP out of a 302 its gonna have to be worked off it nut. High flowing heads, big cam, large free flowing manifold,etc. None of these things are good for torque, but you won't get high HP without them (or a power adder of some sort). For an idea of the hardware needed, have a read of http://www.fordmuscle.com/archives/1...se/index.shtml and all of the related features.

As you can see from this article, the engine will spin to 7000 quite comfortably, so its not even going to be stressed about a 3000rpm cruise. Also if you look at the dyno results the engine doesn't do much at all before 4000 rpm.

If you run 3.5's I reckon you'll be spending too much time in the 1500-3500 rpm range where that engine would be running like a dog.
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