SVreX wrote: I actually prefer the 4.8L. The oversquare design makes the revs much more appropriate for a sports car, and I can give up a little torque with the weight I am targeting.
I agree with this for a smaller, lighter car. I think the 4.8 cammed up nicely would allow a T-5 to live a decent life as well. Torque curve is up the rev range so it's not destroying everything off the line, but will rev to the moon and keep making power.
Appleseed wrote: In reply to SVreX: Could you fortify a T-5 for less money?
Yes. That would be perfectly adequate for a Challenge car.
I am not trying to build a Challenge car. I am trying to build a full blown street car ready for the track at Challenge prices, which I can also bring to the Challenge.
Bobzilla wrote:SVreX wrote: I actually prefer the 4.8L. The oversquare design makes the revs much more appropriate for a sports car, and I can give up a little torque with the weight I am targeting.I agree with this for a smaller, lighter car. I think the 4.8 cammed up nicely would allow a T-5 to live a decent life as well. Torque curve is up the rev range so it's not destroying everything off the line, but will rev to the moon and keep making power.
I am sure you are right about the T-5. I want the 6th gear/ overdrive for highway cruising.
What about a TH350 or 700R4 with a manual valve body or some other kind of similar shift improvement stuffed in? Seems like that should be cheaper to put together than either a toughened T-5 or whatever T56 can be found.
A 700R4 gets you the O/D, should be able to handle the power after some tweaks, and are common as dirt. Probably also easier on the rear end when faced with power from a turbocharged 4.8.
Bobzilla wrote:SVreX wrote: I actually prefer the 4.8L. The oversquare design makes the revs much more appropriate for a sports car, and I can give up a little torque with the weight I am targeting.I agree with this for a smaller, lighter car. I think the 4.8 cammed up nicely would allow a T-5 to live a decent life as well. Torque curve is up the rev range so it's not destroying everything off the line, but will rev to the moon and keep making power.
I dropped an LR4 in a light endurance road race car, and the team gets constant reminders that the T5 is a fusible link that anybody can pop at any time, but - hint hint - please don't. So far about 24 hours on track and no issues. The car is ~2550 lbs and uses a 3.4 or steeper final drive, so it should last for a while I hope... we change rear gears for each track to keep the car in 4th as much as possible, as 3rd and 5th are where I hear about most problems. We have been shifting @ 5700 as we assess durability (engine hasn't blinked yet - even though cooling was an issue at one race and oil got up to 280, and coolant 225) and will likely up the shift point in next race (it has new OEM valve springs on a stock cam so it shouldn't float valves below 6500 we hope), and against all better judgement, will probably tinker with the tune a little even though I think it is indestructible with the factory tune. With the stock cam, it pulls from below 3000 rpm, and pulls great all the way to shift point. I wish it was street legal so I could drive it more...
SVreX wrote:Bobzilla wrote:I am sure you are right about the T-5. I want the 6th gear/ overdrive for highway cruising.SVreX wrote: I actually prefer the 4.8L. The oversquare design makes the revs much more appropriate for a sports car, and I can give up a little torque with the weight I am targeting.I agree with this for a smaller, lighter car. I think the 4.8 cammed up nicely would allow a T-5 to live a decent life as well. Torque curve is up the rev range so it's not destroying everything off the line, but will rev to the moon and keep making power.
T-5's 5th gears is overdrive, too. The T-56 has a double overdrive.
I checked on Jegs and they have listed the 5th gear on a Ford T-5 as 0.63 and the 6th gear on a Chevy T56 as 0.63. Of course 5th gear is also an overdrive at 0.80.
SVreX wrote:Bobzilla wrote:I am sure you are right about the T-5. I want the 6th gear/ overdrive for highway cruising.SVreX wrote: I actually prefer the 4.8L. The oversquare design makes the revs much more appropriate for a sports car, and I can give up a little torque with the weight I am targeting.I agree with this for a smaller, lighter car. I think the 4.8 cammed up nicely would allow a T-5 to live a decent life as well. Torque curve is up the rev range so it's not destroying everything off the line, but will rev to the moon and keep making power.
Cheaper, stronger, and probably lighter than the T5:
http://www.ebay.com/itm/Chevy-4-Speed-Overdrive-Transmission-A-833-GM-Style-440-MY6-New-Process-Muncie-/262104418981
You can find them cheaper on not-ebay, look for manual 80's diesels.
RossD wrote: I checked on Jegs and they have listed the 5th gear on a Ford T-5 as 0.63 and the 6th gear on a Chevy T56 as 0.63. Of course 5th gear is also an overdrive at 0.80.
Depends on the application. Some of the T56's are 0.75 5th, and 0.50 6th.
I need to follow this thread. 
I see the HP.. what's the torque on this wee great beastie?
In reply to tuna55:
I'll probably be looking for one of those for the Not.
mad_machine wrote: I see the HP.. what's the torque on this wee great beastie?
295 ft-lbs
In reply to mad_machine:
For a bone stocker, 285-305 at the crank.
Appleseed wrote:SVreX wrote:T-5's 5th gears is overdrive, too. The T-56 has a double overdrive.Bobzilla wrote:I am sure you are right about the T-5. I want the 6th gear/ overdrive for highway cruising.SVreX wrote: I actually prefer the 4.8L. The oversquare design makes the revs much more appropriate for a sports car, and I can give up a little torque with the weight I am targeting.I agree with this for a smaller, lighter car. I think the 4.8 cammed up nicely would allow a T-5 to live a decent life as well. Torque curve is up the rev range so it's not destroying everything off the line, but will rev to the moon and keep making power.
just means you can run a higher ratio rear
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