Great Asp's Superformance - FE Build

[dlang14]

It may have changed by now, but I know when they first started using the BTR center gear sets were hard to find, and only available in a handful of ratios. I know there was talk at one point about it being essentially the same unit as a Pontiac GTO so their gear sets might fit? I never heard one way or the other if that was correct or not.

I find I'm happy with the 3.46 and the TKO600 and .82 OD. First gear is up in smoke before you say boo on my Roush427R motor, your FE should be more than enough for your tires

I do wish I had a little more OD as I find I cruise 65-70MPH at 2800 or so. using 295/50-15s by the way. Most of the calculators say I should be turning fewer RPMs but I've checked the speed with GPS and a chase car and it all seems to check out.

Daryl

[Great Asp]

Originally Posted by dlang14

It may have changed by now, but I know when they first started using the BTR center gear sets were hard to find, and only available in a handful of ratios. I know there was talk at one point about it being essentially the same unit as a Pontiac GTO so their gear sets might fit? I never heard one way or the other if that was correct or not.

I find I'm happy with the 3.46 and the TKO600 and .82 OD. First gear is up in smoke before you say boo on my Roush427R motor, your FE should be more than enough for your tires

I do wish I had a little more OD as I find I cruise 65-70MPH at 2800 or so. using 295/50-15s by the way. Most of the calculators say I should be turning fewer RPMs but I've checked the speed with GPS and a chase car and it all seems to check out.

Daryl

Your crusing rpms seem spot on for your arrangement. I will have the same, but I would rather have like 2200 rpms for the highway at 70 mph

Really, If they would have had the 3:73 for the rear, I would have ordered the .64 5th. Go to the Second Strike Calculator and play around with the rear gears and the 5th speed and you will see what I mean. With 3:73's, and a .64 5th you get a nice cruising speed/rpm ratio.

http://www.secondstrike.com/Technical/GearCalc.asp

Thanks for posting!

E

[Great Asp]

Keith sent me over some pics of the block in process today!




Beauty huh?

I have sidepipe pics coming.

I would have engine mount pics from Craig if he would send them....hint hint

E

[Chaplin]

Originally Posted by Great Asp

Your crusing rpms seem spot on for your arrangement. I will have the same, but I would rather have like 2200 rpms for the highway at 70 mph

Really, If they would have had the 3:73 for the rear, I would have ordered the .64 5th. Go to the Second Strike Calculator and play around with the rear gears and the 5th speed and you will see what I mean. With 3:73's, and a .64 5th you get a nice cruising speed/rpm ratio.

http://www.secondstrike.com/Technical/GearCalc.asp

Thanks for posting!

E

Try 3.31 with the .82 5th- about perfect

[Stentor]

Originally Posted by Chaplin

Try 3.31 with the .82 5th- about perfect

Agree--I second that.

[dlang14]

Originally Posted by Great Asp

Your crusing rpms seem spot on for your arrangement. I will have the same, but I would rather have like 2200 rpms for the highway at 70 mph

Really, If they would have had the 3:73 for the rear, I would have ordered the .64 5th. Go to the Second Strike Calculator and play around with the rear gears and the 5th speed and you will see what I mean. With 3:73's, and a .64 5th you get a nice cruising speed/rpm ratio.

http://www.secondstrike.com/Technical/GearCalc.asp

Thanks for posting!

E

Second Strike calculator says 3000 rpms would be 81MPH. I'm lucky if its 75. Not sure why the delta but it definetely isnt right. Actually just now playing with the calculator the numbers look a whole lot closer if I plug in 3.73 or 3.77. Neither makes sense as I've got build 2293 which should be the BTR center with 3.46.....Now I'm curious. When I get some free time (never right now with 5 month old twins) I'll jack it up and try to figure out what the deal is