Dan B.
06-15-2012, 12:44 AM
Went to PRP tonight. Took the '88 Thunderbird Sport w/ the '88 5.0 HO swap, T5 and some other stuff. Got four passes in. I made three passes (#1, 2 and 4) and I let a friend drive the third pass. It was running a set of 26x10.50-15 MT ET Streets on turbine wheels with 20# of air. Should have dropped them down but it slipped my mind. Don't laugh at the times but you have to start somewhere and I've not done anything to tune it at all.
Pass #1 was a 1.96 (60'), 14.1 @ 95.6 mph.
Pass #2 was a 1.95 (60'), 14.06 @ 96.5 mph.
Pass #3 was a 2.1 (60'), 14.31 @ 98.1 mph.
Pass #4 was a 1.91 (60'), 14.05 @ 96.6 mph.
The good news....I'm pleased. There was a Lincoln spec'd out about the same as the 'bird (HO, T5) that was running high 14's and low 15's. On my passes it was launched at 4,000 rpm and shifted at 5,800rpm. The one down side is a dead flat spot at 4,800rpm. It pulled hard to 4,800, flattens out then pulls slow up to 5,800...this happens in each gear and I'm pulling into 4th about 100' before the traps (so three times). This flat spot is costing me "at least" two tenths. I had noticed this on the street also so I was aware of it before going down. I'd be at least solid 13.75 (or quicker) car without the problem.....and I'm happy with that in a fully dressed '88 Thunderbird running 3.55's.
Any ideas of what may be causing the problem?? Timing is 16 degrees, FP is 42#, MAF is stock, stock 19# injectors, TB is 70mm Edelbrock, intake is Explorer, stock '88 HO heads and cam.
Just throw some ideas out and I'll start tuning.
Pass #1 was a 1.96 (60'), 14.1 @ 95.6 mph.
Pass #2 was a 1.95 (60'), 14.06 @ 96.5 mph.
Pass #3 was a 2.1 (60'), 14.31 @ 98.1 mph.
Pass #4 was a 1.91 (60'), 14.05 @ 96.6 mph.
The good news....I'm pleased. There was a Lincoln spec'd out about the same as the 'bird (HO, T5) that was running high 14's and low 15's. On my passes it was launched at 4,000 rpm and shifted at 5,800rpm. The one down side is a dead flat spot at 4,800rpm. It pulled hard to 4,800, flattens out then pulls slow up to 5,800...this happens in each gear and I'm pulling into 4th about 100' before the traps (so three times). This flat spot is costing me "at least" two tenths. I had noticed this on the street also so I was aware of it before going down. I'd be at least solid 13.75 (or quicker) car without the problem.....and I'm happy with that in a fully dressed '88 Thunderbird running 3.55's.
Any ideas of what may be causing the problem?? Timing is 16 degrees, FP is 42#, MAF is stock, stock 19# injectors, TB is 70mm Edelbrock, intake is Explorer, stock '88 HO heads and cam.
Just throw some ideas out and I'll start tuning.