Rockingham Dragway 1JUN24: DA's ranged from ~ 1,600ft to 1,300, which was right in the same ballpark as the DA
the last time I ran the car at the Mooresville 1/8 mi strip back at Foxtoberfest. Then, I ran a best of 8.36 ET and a best trap speed of 83.8mph on a 1.86 60'.
Since then, the changes off of the top of my head include (I think):
- Switched from
BBK to Accufab 70mm TB (no expected HP gain -- just helped with the whistle)
- Went from 4.10s to 3.73s
- Added electric fan
- Put U/D crank & waterpump pullies & oversized alternator pulley
- TMOSS/MMOSS ported the lower intake
It was different track, different day so not the best scientific comparison, but today's best was:
[email protected] in the 1/8 on a 1.95 60'. To get there, I was launching off of the limiter that I set at 6,100 RPM and also shifting at the limiter.
This was, in fact, a 1/4 mile track, and that worked out to a
[email protected], which is *technically* the fastest speed Black Jack has ever trapped, because with 4.10s it was gear limited. I say technically, because way back in the day it did run 86.47mph in the 1/8 when it wasn't full of Kilmat, didn't have the nitrous bottle, had 1/8 of a tank instead of 3/4 like tonight, didn't have the heavy T56, the wheels and tires weigh more, & it had the more efficient T5. That's at least 150 extra lbs, tonight. Plus I probably had better air at Kilkare. Something it will undoubtedly do again NA in better air. I definitely think it's making more power now than it ever has.
The interesting takeaway for me, tonight, was that Black Jack liked 15* of base timing best. I'm certain that back in the day it liked 18*. I wonder about that.
I did not get a chance to open up the bottle. I wanted to get a good baseline N/A again before doing that.
Not quite a fair comparison & power gain estimate:
One thing that makes it not directly comparable to the foxtoberfest night is that I did ice down the intake on the final run, which was the quickest & fastest. Still, on the 2nd to last run, when I didn't ice the intake, & everything was at normal operating temps, it still went
[email protected] &
[email protected] in the 1/4 on a 1.89 60'. Therefore, I estimate the 85.18 vs. the 83.8 at nearly identical DAs was worth at least ~17rwhp. Though it's hard to account for what impact the gear ratio change had on trap speed. I'm hitting the traps NA at ~5,300 RPM instead of at redline like with the 4.10s. So, that probably means peak power gains are probably a bit higher than that estimate. We'll see if that estimate was worth anything when I'm able to get it on the dyno, again.