Ok. I have been reading through some of the threads on here regarding info on TBS 250. I am looking for opinions on other factors when bolting one on.

Old Setup

09 M&M 565 Ron's single Terminator high 4.60 / low 70"s

Slack Converter Launch 4600 Flash to 6900 shift @ 7400 Drop back to 6900 finish line 7500 rpm

M/T 3183 Tire & 4.30 Gear

New Setup

2021 M&M 582 Ron's Single Terminator ( Same Motor combo just fresh bottom end with new crank )

Converter is the same

Hoosier 34.5 1550 tire & 4.10 gear

I was planning on keeping the 4.30 gear with the taller tire. My 3183 were like 105. These new Hoosiers are like 110 but after deciding to do the blower setup I thought maybe it would makeup for the RPM difference of the tires. Also curious about the Looseness of the Converter. I am going to call Greg about it. Just curious about others opinion on this & launch rpm. Do you think the 4.30 is still ok to use. Only really looking at 3-4 LBS of boost with the blower setup. Im not looking for Max effort at all.

In my case i was running low 4.80s high 70s. N/a flash was 6100-6200. With the blower flash is 6900-7100 depending what top pulley is bolted on. 4.30 is probably okay with the tall tire but if you're similar to stall gains as mine or others i've spoke with you'll need to do something there.

I launch at 3800 currently, have tried higher (4200) but saw no et gains.

When you were N/A did you launch higher than 3800

quote:

Originally posted by I Hate Dragsters:
In my case i was running low 4.80s high 70s. N/a flash was 6100-6200. With the blower flash is 6900-7100 depending what top pulley is bolted on. 4.30 is probably okay with the tall tire but if you're similar to stall gains as mine or others i've spoke with you'll need to do something there.

I launch at 3800 currently, have tried higher (4200) but saw no et gains.

n/a i was leaving at 4600

You can leave the 4.30 gear and whatever tire you chose as long as the converter is tight enough to make the trip. The current vibe in the converter world with these 250 blowers and even 1000+ HP NA seems to be flash to 6900/7000 shift 7400/7500 cross 7400/7500+. I have tried 2 of these style converters one NA and one on a BDS 250 blown 598 BBC's. I don't like the approach taken with the really lose converters. They seem slow (lost 5 MPH and nearly a tenth on my 598/250 combo, 4 link miller, 9" abruzzi vs the TS 10").

I'd get something that flashes to 6400/6500 range, shift 7300, even if you are 155+ MPH you'll be 7400RPM or lower if the converter is efficient enough up top. My 10" TS northstar converter is snug down low (flash to 6100 no timing retard, fall back to 6200) and at 155 MPH mine was only 7300 RPM with a 4.30 gear 34.5 tire is all i run but have tried the 33.5 little bubbas with similar results. The 9" abruzzi flashing to 6900 crossed at 7500+ with 4.11 gears, was slower ET, and lost 5 MPH. The 9" needs to be tightened but still i think it will be slower than a losened 10".

The recommended rear gear for the TBS 250 on these BBC combos is 4.11, but i wouldn't get all excited about swapping gears till you have tried it out a couple times. You may find the 4.30 is just right. I'm going back to my 10" TS and a 4.30 gear, 34.5 tire when i get back to racing later this year.

quote:

Originally posted by Triple Nickel:
You can leave the 4.30 gear and whatever tire you chose as long as the converter is tight enough to make the trip. The current vibe in the converter world with these 250 blowers and even 1000+ HP NA seems to be flash to 6900/7000 shift 7400/7500 cross 7400/7500+. I have tried 2 of these style converters one NA and one on a BDS 250 blown 598 BBC's. I don't like the approach taken with the really lose converters. They seem slow (lost 5 MPH and nearly a tenth on my 598/250 combo, 4 link miller, 9" abruzzi vs the TS 10").

I'd get something that flashes to 6400/6500 range, shift 7300, even if you are 155+ MPH you'll be 7400RPM or lower if the converter is efficient enough up top. My 10" TS northstar converter is snug down low (flash to 6100 no timing retard, fall back to 6200) and at 155 MPH mine was only 7300 RPM with a 4.30 gear 34.5 tire is all i run but have tried the 33.5 little bubbas with similar results. The 9" abruzzi flashing to 6900 crossed at 7500+ with 4.11 gears, was slower ET, and lost 5 MPH. The 9" needs to be tightened but still i think it will be slower than a losened 10".

The recommended rear gear for the TBS 250 on these BBC combos is 4.11, but i wouldn't get all excited about swapping gears till you have tried it out a couple times. You may find the 4.30 is just right. I'm going back to my 10" TS and a 4.30 gear, 34.5 tire when i get back to racing later this year.

What he said....mine leaves like a slug, usually high 1.04 to mid 1.05 (been 1.035 once) going 4.44-4.45 @ 157-158 @ 2200'-2500' DA. Really think if it was tighter it would be faster down low and more mph.

Ok. I did talk to Greg Slack this morning about my converter he built a couple years ago. He pretty much echoed what you guys have said. He suggested a 10" as well

quote:

Originally posted by Triple Nickel:
You can leave the 4.30 gear and whatever tire you chose as long as the converter is tight enough to make the trip. The current vibe in the converter world with these 250 blowers and even 1000+ HP NA seems to be flash to 6900/7000 shift 7400/7500 cross 7400/7500+. I have tried 2 of these style converters one NA and one on a BDS 250 blown 598 BBC's. I don't like the approach taken with the really lose converters. They seem slow (lost 5 MPH and nearly a tenth on my 598/250 combo, 4 link miller, 9" abruzzi vs the TS 10").

I'd get something that flashes to 6400/6500 range, shift 7300, even if you are 155+ MPH you'll be 7400RPM or lower if the converter is efficient enough up top. My 10" TS northstar converter is snug down low (flash to 6100 no timing retard, fall back to 6200) and at 155 MPH mine was only 7300 RPM with a 4.30 gear 34.5 tire is all i run but have tried the 33.5 little bubbas with similar results. The 9" abruzzi flashing to 6900 crossed at 7500+ with 4.11 gears, was slower ET, and lost 5 MPH. The 9" needs to be tightened but still i think it will be slower than a losened 10".

The recommended rear gear for the TBS 250 on these BBC combos is 4.11, but i wouldn't get all excited about swapping gears till you have tried it out a couple times. You may find the 4.30 is just right. I'm going back to my 10" TS and a 4.30 gear, 34.5 tire when i get back to racing later this year.

541 Dyno Numbers

Brodix -3xtra 335’s ported exhausts titanium valves, Brodix aluminum block, 4.500 Bore, 4.250 stroke
12-7.1 compression
Naturally Aspirated
936.2 HP
747.1 torque

10-20
TBS 250 blower
Standard top with black widow spacer
APD 1250 Alcohol Enforcer

FTI 9”
A12
SSW95B
Spragless/Aluminum Stator
6200-6300 estimated
Ran very slow behind naturally aspirated 540 didn’t record but felt extremely tight
1.245 60’ 5.179/136 put 20SC-1 in and picked up to 5.01/138
Behind blower combo 3100-3600’ fall back to 6500 RPM on shift 1.077 60’ 3.045 330’ 4.72/146 just too tight shifted at 1.7 7100
RPM shifted at 1.9 7400 RPM
4400 Launch


Hughes
20SC-1 best et 4.81/142 600’
Best projected 4.801
Ran 4.92-4.96 in heat
Ran 4.81-4.88 in good air
1.08-1.10 60’
6400-6500 on shift drop back
4600-4800 launch car goes mid 4.90’s 3500’-4400’
4200 launch goes 4.96-5.02
Blower set up 4600 launch
Launch falls back to 7300
Shifting at 1.7 on rev limiter a lot best ET 4.67-147MPH
1.043-1.049 60’ over 10
Runs in 2 days
32 degrees timing

GM 96 MM 20SC+1
Converter falls back to 7000 on shift, 1.05-1.06 60’, in g in ood air 1500’ below 4.60 player shift 1.65 7600 RPM, above 1800’ 4.61 to 4.63 150.90 MPH
32 degrees timing in grid

GM 95 MM 016 SB
30 degrees timing
1.05-.06 player Tulsa 39 pulley 4.72/145 1.45 shift
1.05-.06 player in Vegas with 37 pulley 4.66/147.98 1.8 shift
S/C ran 181 MPH 4500
Launch .025 box to be .012
Runs 4.53/153 @Tulsa 1800’ 1.8 shift(7740)

Blown 1250 Carb/Buffco top
1st pull 3# Boost
6800 RPM 39 Pulley 1250 Carb
1157/957
30 degrees timing

7500 RPM
39 Pulley 1250 Carb 3# Boost
1207/957
30 Degrees Timing
MM016SB1
4.65/151
4.29 gear little bubba

37 Pulley 1250 Carb 4# Boost
1245/981
30 Degrees Timing
MM016SB1 4.538/153.13
4.29 gear little bubba

35 Pulley 1250 Carb 5# Boost
1289/1021
30 Degrees timing
MM016SB1
@3500’ 4.559/152.76

35 Pulley 1450 Carb 5# Boost
1302/1034
30 Degrees Timing

33 Pulley 1450 Carb 6# Boost
1.021 60’ 2.880 330’ 4.45/156.44
Big Bubbas
30 degrees timing
4.29 gear MM016SB1
Shift @1.75 7721 RPM
Fall back around 6550-6600
2017 Lbs

This message has been edited. Last edited by: Blake4128,

582 BB3 headhunter, 2100 Diamond dual suspended, 4.10 rear, big bubba, 4200 launch, taking 5 degrees for 1.5, 4.46@158 1.025, 2.88 330ft. Abruzzi 06YAT 9". Shift at 7700 falls back to 6700 crosses 1/8th at 7350. This is with a bufco top, with a APD carb, 33 pulley, made 1234 at 7000 (stopped pulling it there) on Wilson's Dyno. Motor is deadly consistent and runs well. Short shifting it the car slows down a little in mph but quite a bit in ET, picking up the shift goes parallel the other way.

I am happy with the setup as it is, could put the 31 pulley on it but no need. I will say putting all the timing in and running it with no retard on the starting line gave ZERO performance increase at 60, 330 or finish line, was within .001 all the way down the track back to back.

One warning, don't ever get one of these baby blowers if you don't want to keep it forever, LOL.

quote:

Originally posted by The Bozman:
582 BB3 headhunter, 2100 Diamond dual suspended, 4.10 rear, big bubba, 4200 launch, taking 5 degrees for 1.5, 4.46@158 1.025, 2.88 330ft. Abruzzi 06YAT 9". Shift at 7700 falls back to 6700 crosses 1/8th at 7350. This is with a bufco top, with a APD carb, 33 pulley, made 1234 at 7000 (stopped pulling it there) on Wilson's Dyno. Motor is deadly consistent and runs well. Short shifting it the car slows down a little in mph but quite a bit in ET, picking up the shift goes parallel the other way.

I am happy with the setup as it is, could put the 31 pulley on it but no need. I will say putting all the timing in and running it with no retard on the starting line gave ZERO performance increase at 60, 330 or finish line, was within .001 all the way down the track back to back.

One warning, don't ever get one of these baby blowers if you don't want to keep it forever, LOL.

How much total timing are you running?
How much boost do you get with 33 pulley?
Also, how much slower is a quite a bit when short shifting?

Anyone try one with a 1.69 1st gear?

most likely tore up an intake lobe when an exhaust rocker broke...what sort of cam profiling are you guys running? Currently at .824/.824 285/312 @.050 114 lobe sep, installed at 110. Always thought maybe a little aggressive.

quote:

Originally posted by I Hate Dragsters:
most likely tore up an intake lobe when an exhaust rocker broke...what sort of cam profiling are you guys running? Currently at .824/.824 285/312 @.050 114 lobe sep, installed at 110. Always thought maybe a little aggressive.

Why in the hail do you have the cam so far forward?

He didnt mention what the icl was ground on, only the lsa, a good bit of cams with that lsa are on a 110 icl, so hard to say where it is installed based on the grind and what was quoted.

quote:

Originally posted by Jerry Kathe:
He didnt mention what the icl was ground on, only the lsa, a good bit of cams with that lsa are on a 110 icl, so hard to say where it is installed based on the grind and what was quoted.

This ^ lsa 114, 110icl

quote:

Originally posted by gxp7903:

quote:

Originally posted by The Bozman:
582 BB3 headhunter, 2100 Diamond dual suspended, 4.10 rear, big bubba, 4200 launch, taking 5 degrees for 1.5, 4.46@158 1.025, 2.88 330ft. Abruzzi 06YAT 9". Shift at 7700 falls back to 6700 crosses 1/8th at 7350. This is with a bufco top, with a APD carb, 33 pulley, made 1234 at 7000 (stopped pulling it there) on Wilson's Dyno. Motor is deadly consistent and runs well. Short shifting it the car slows down a little in mph but quite a bit in ET, picking up the shift goes parallel the other way.

I am happy with the setup as it is, could put the 31 pulley on it but no need. I will say putting all the timing in and running it with no retard on the starting line gave ZERO performance increase at 60, 330 or finish line, was within .001 all the way down the track back to back.

One warning, don't ever get one of these baby blowers if you don't want to keep it forever, LOL.

How much total timing are you running?
How much boost do you get with 33 pulley?
Also, how much slower is a quite a bit when short shifting?

How much total timing are you running? 31

How much boost do you get with 33 pulley? 4lbs

Also, how much slower is a quite a bit when short shifting? I can kill .07 shifting from 2.1 to 1.6 on time, 7900 to 7500