nonsensez9

Curious results at the track with the 4.10s - higher trap speed, but et stayed about the same. Might be that I have to get accustomed to them, 'cuz my 60's were nothing to write home about. Anyways, with the 275/50/17 M&H I did not have to shift into 4th. Crossed the line at about 6500rpm in third. Kind of unsettling to see that much red before the needle. A couple passes I shifted into 4th just to see the outcome... it slowed me down. Gets through 1st and 2nd real quick now.

as far as street performance: again, gets through 1st and 2nd real quick. I find myself in 4th gear a bit more on streets that I used to be in 3rd. And they're a bit louder than the 3.55s, noticably at 50+ mph. And a bit harder on gas mileage.

don_w

IMO, the 28" tires are too tall. With a 26" tire, you'll launch even better. When I had 26" DRs, I was in 4th gear by the 1/8-mi mark.

nonsensez9

probably. I can only get out 1 or 2 more times this year, so it'll have to wait until spring.

nonsensez9

I'm at about 78mph at 1/8. If I had an automatic that was set up to shift at 6000rpm it would be shifting into 4th right at about the 1/8 mark... according to the RPM vs. Speed spreadsheet that you drafted some time ago. However in the manual tranny I have about 12 more mph before hitting 6000 rpm. I still believe you're correct on the tire size, though. A 26 inch tire would put me in 4th well before the 1/4.... or I could just get some N2O or boost

don_w

Sounds to me like you are trapping at around 100mph. If that's the case, then you'd be at about 5500rpm in 4th gear with 26" tires... maybe a little higher, because your 60' times would likely be better.

nonsensez9

you are bang on, my man. 100.xzy MPH. I'll have to see if I can borrow my Mustang buddy's MT ET Streets for a pass or two.

My Blue Heaven

When I had my 4.10's I was either banging off the limiter or shifting right before the line in the 1/8th so I don't miss them. If my calc's are correct a 3.73 would get me just over the line without hitting the limiter or shifting into 4th, but I don't know that it would give me that much. Maybe bring my 60' down into the 1.9x range finally (best is 2.03 so far). I dunno. with gas as high as it is I just can't see killing my mpg Sat through Thurs for a lil Friday night fun. that's just me though.

don_w

Where do you have your shift points set?? And what diameter tire are you running?