quote:

Originally posted by Blake4128:
Those that have made the switch how much have you changed converters and what converter are you running?

quote:

Originally posted by Thurston:
First passes in my dragster with new 250 on my 582.
On Oakley's dyno 1335 Hp at 1095 Tq.
Car weighs 2140 with driver
4.61 - off trailer
4.59 - 2nd pass
4.57 - 3rd pass
Air at 205 to 410 Adjusted
Only change was air pressure on my little buba's
started at 6.5 (old N/A setting) and went up 1/2 pound each pass. It was obvious the little's were going to go bad quickly with the 1.04's short times. Switching to big's this week end.
Oakley recomended a converter that went 6200, I was at 6000. I'm happy with the coverter as long as the air is good, but this summer may need to change back to my old converter that went 6400 when my 582 was N/A at 1100 hp.

quote:

Originally posted by Thurston:
Yup, no doubt, it was pretty fat, but wanted to do the one change at a time thing, and the goal was to find out if the littles were going to hold up to 4.5xx. Didn't take long to get the answer.

Will be leaning it out little by little this weekend to see what happens. May find some of that missing HP. I know it's there somewhere :>)

quote:

Originally posted by TOP38:

quote:

Originally posted by Thurston:
First passes in my dragster with new 250 on my 582.
On Oakley's dyno 1335 Hp at 1095 Tq.
Car weighs 2140 with driver
4.61 - off trailer
4.59 - 2nd pass
4.57 - 3rd pass
Air at 205 to 410 Adjusted
Only change was air pressure on my little buba's
started at 6.5 (old N/A setting) and went up 1/2 pound each pass. It was obvious the little's were going to go bad quickly with the 1.04's short times. Switching to big's this week end.
Oakley recomended a converter that went 6200, I was at 6000. I'm happy with the coverter as long as the air is good, but this summer may need to change back to my old converter that went 6400 when my 582 was N/A at 1100 hp.

1300 plus HP would put your car solidly in the 4.40's and 157 MPH at that weight. Your missing some HP... which could explain the low stall on the converter.

quote:

Originally posted by Thurston:
Yup, no doubt, it was pretty fat, but wanted to do the one change at a time thing, and the goal was to find out if the littles were going to hold up to 4.5xx. Didn't take long to get the answer.

Will be leaning it out little by little this weekend to see what happens. May find some of that missing HP. I know it's there somewhere :>)

quote:

Originally posted by Triple Nickel:
I've tried a Transmission Specialties 10" and a 9.5" Abruzzi.

The TS 10" locks up right at 6200 with all the timing in it and a 4.11 gear (crossed 1/8 mile at 6800) and with a 4.30 gear (i never put all the timing in at the hit) flashed to 6000 pulling 8 degrees and crossed 1/8 mile at 7200/7300 with the 4.30. Pulling 10 to 13 degrees at the hit it flashed to 5800 or so. DA was 3-400'.

On the 9.5" Abruzzi, i was pulling 10 degrees, flashed to 6750 with a 4.11 crossed 1/8 mile at 7300 rpm, only have 4 passes on the Abruzzi but i'm thinking it needs to be tightened up about 400 RPMs. More to come on this one soon as the weather and work allow me to race again. DA was 800 to 1000'.

Car weighed 2000 lbs even with me in it before the blower, shipping weight was 125 lbs on the blower plus an additional few lbs on the converter (was an 8") and blower nick nacks, so my best guess is somewhere around 2120 to 2150 race weight. Motor is a 598 with Dart Pro 2 380's,13.5:1 compression, 850 lift, made 1025 and 850 NA. No changes just bolted the blower on top, MFI injected, Bird Catcher both NA and with blower.

It's been 4.45 at 155 with the 10" converter, pulling 10 degrees at 0.100 and all back in by 0.600, but seems to be a little happier around 4.48 to 4.50 range to keep the front end low enough to be consistent (pulling 10-13 degrees from 0.100 till 0.600) DA was 3-400'.

With the 9.5" and 4.11's it ran 4.56 at 149. The weather was a little worse 800 to 1000 feet, and track wasn't very good at all. Plus I swapped in a bigger fuel pump and still working through the tune up a tad. Was pulling 10 degrees from 0.1 to 0.600.