FABO racers, could use your help to win a bet.
Well, I went and let my ego get me into trouble again. Yup, good ole peer pressure at it's finest. So here's the skinny on the bet. Myself and a few other guys have all gone in on a fairly substantial pot to whoever can reach their goal first, in 1/4 mile et. A couple are shooting for 11's, another is trying for 12's, and I've got to run a 10 sec pass to claim the pot. I think I have a good shot at winning, but need some help from the more experienced racers here.
My combo:
1986 Mazda RX7
2900 lbs, 3150 with me
No weight reduction other than fiberglass hood
360 magnum
Stock bottom end
Stock heads, untouched
216/224, .506"/.506", 114 cam
MP .525" lift springs and MP non beehive retainers
Mopar M1 single plane
650 dp
1 5/8" block huggers
2.5" dual exhaust, x-pipe, straight thru mufflers
Locked distributor with MSD Programmable Digital 6
20 initial / 34 total timing on 87 octane
Walbro 255 lph fuel pump
Extreme Automatics built 200-4R
Gear ratios: 2.74, 1.57, 1.00, .69
Revmax 9.5" 3600 stall
Ford IRS 8.8
New Trac-Lok with carbon clutches
3.73 gear
275/50-15 (26") Drag Radials
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Typical 1/8 mile run in decent air (1568 DA)
Trans shifting itself at 5000 rpm
60ft - 1.63
330 ft - 4.949
660ft - 7.71
MPH - 87.66
I know that's short shifting but I do it for consistency and rarely manual shift unless it spins. If I were to manualy shift at 5700 (where I stop seeing gains) it would run something like 7.65-7.68 @ ~88 mph.
Unfortunately I don't have a 1/4 mile slip that matches the conditions of the run above, but if the car will run good 6.90's in the 1/8 it should go 10.9xx in the 1/4. Well, that's what I'm thinking anyway.
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I see that this is starting to become a long post so I'll sum things up a bit. Do you think a 100 shot will do the trick? Currently I don't want to do any major mods (cam swap, gear change, etc) due to the fact that I run a 7.65/12.00 cut-off class in a bracket series and am already at the limit. Plus, I'm going to be the defending champ next year so I don't want to change my n/a combo that much.
If the 100 shot would do it, I have another small delima that needs addressing. I think I'm going to run out of gear. Currently I cross the 1/4 mile stripe at 5700-5800 at ~113 mph. To run a 10.9xx I'll at least need to run 120, probably 125. That would put my rpms well over 6k, which is way out of my useable power band. Would that hurt anything, meaning engine damage?