SST MPH / Roll Bar Question

[Keith 944]

Originally Posted by DailyDriverSst

Finally got my truck almost done. I did 1100 miles on Rocky Mountain Race Week 2.0 with a tune kind-of duct taped together on 8ish pounds of boost

4400 pounds with me in it
408 small block with F1A procharger
1.80 low Glide, 4.10 rear gear
275 M&H DOT radial
2-step 3000

60': 1.78
330': 4.96
660': 7.67 @ 91
1000': 9.99
1320': 11.95 @ 114

Since then, I've moved some weight around, mounted 28x9 radial slicks, added traction bars, and changed to a 1.98 low gear. Same 8 pounds of boost (really closer to 7 at 1/8 mile). I've also creeped the 2-step up to 3500.

So far, best 1/8 ET is:

60': 1.67 ___(+0.11)
330': 4.74 ___(+0.22)
660': 7.32 @ 95 ___(+0.35)

Right now i'm moving even more weight around and tweaking on the leaf springs/suspension. I'm thinking I might be able to get the 2-step up to 4,000 without getting into the converter.

What would this equate to in the 1/4 mile as things stand? Wallace calculator says 11.66 @ 117, but I'm curious on real numbers. Based on the incremental gains, I'm thinking 11.50's, MAYBE high 11.40's?


Now my real question: Once I get weight and power management under control and move up a blower pulley to 12 pounds of boost, I'm obviously trying to nail 7.00 index in the 1/8 and 10.90 in the 1/4.

How close to the 135 MPH barrier might I get? I want to only do a 5 point roll bar if I can. I'm optimistically thinking I probably won't surpass 125?

You will be way under 135. 120-124 sounds about right and don’t forget the rollbar will add some weight right now my street /strip car can run around 1090s to 11.00 I will look at the numbers and get back to you

And I believe it’s 6.90 1/8 mile. 7.00 was old ihra index