Thinking of switching to 1.69 1st gear. Anyone have any before and after results? Does it effect converter drastically? Fall back or stall
2060 pound dragster 565 baby blower. 33 pulley. 4.40s-4.50s @mid to low 150s guessing 1250-1300HP 4.11 34.5 tires 31 or 29 pulley may be used in futureThis message has been edited. Last edited by: Nitrous1,
November 01, 2021, 05:34 PM
WHOMPWHOMP
I know several people that tried it an switched back real quick….
November 01, 2021, 05:59 PM
"The Bender"
I used a 1.64/4.10 combo very successfuly, but I was making about 1000 more HP than what you likely are......
272" Spitzer 540 Chevy The Blower Shop XR1 FTI XPM Series Converter FTI Level 6 Powerglide 3.69@199 .916 60'
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2018 PDRA T/D #5 2019 PDRA T/D #2
2020 Retired From T/D Competition....
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November 01, 2021, 06:35 PM
Nitrous1
quote:
Originally posted by WHOMPWHOMP: I know several people that tried it an switched back real quick….
Slow, inconsistent, or other issues?
November 01, 2021, 07:15 PM
jenavet
quote:
Slow, inconsistent, or other issues?
none of the above if your combo is correct
November 01, 2021, 08:17 PM
WHOMPWHOMP
quote:
Originally posted by Nitrous1:
quote:
Originally posted by WHOMPWHOMP: I know several people that tried it an switched back real quick….
Slow, inconsistent, or other issues?
Not 100 percent sure but seems like one of them said the gear out back needed to be changed along with it to may a real change
November 01, 2021, 08:54 PM
SP 124X
quote:
Originally posted by Nitrous1:
quote:
Originally posted by WHOMPWHOMP: I know several people that tried it an switched back real quick….
Slow, inconsistent, or other issues?
The guy we buy all of our trans parts from told me he didn't think the 1.69 was as strong as the 1.80.
Denis LeBlanc
November 01, 2021, 11:34 PM
Mike Rietow
If you're 1/4 mile racing, you're better off 1.80 UNLESS you're boosted big hp, then you could use one, dumps even if you're around 3,000hp.
1/8 mile, if you know what you're doing, you can outrun everyone similar combo. I did anyway.
November 02, 2021, 07:17 AM
The Bozman
I put a 1.69 in my Top Sportsman car and it callmed the leave down a ton but didn't affect ET. I have done it in a 2500 lb car with 1700 hp and also a 2650 car with 1200.
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November 02, 2021, 09:35 AM
Rodney Pryor
quote:
Originally posted by The Bozman: I put a 1.69 in my Top Sportsman car and it callmed the leave down a ton but didn't affect ET. I have done it in a 2500 lb car with 1700 hp and also a 2650 car with 1200.
This is good to know. I plan on testing a 1.69 low gear transmission next year to calm down the leave in my car. I have been using a lot of launch retard to manage wheel speed currently as I think I have too much SLR with the 1.80 low gear x 4.56 rear gear.
November 02, 2021, 09:35 AM
NC3x58
Just like anything else, it can be useful in tuning.. Lots of variables. I've always wondered what would happen if you put one in if you were strictly racing 1/8 to make it so you can change the rear gear from say a 4.10/4.30 to like a 4.56/4.88 or something so you can still have a similar or equal starting line gear ratio and then allow the car to accelerate harder through the rpm range through the 1/8?
Nick Craig
1971 Camaro Split Bumper 376ci LS3
November 02, 2021, 11:04 AM
Mike Rietow
quote:
Originally posted by NC3x58: Just like anything else, it can be useful in tuning.. Lots of variables. I've always wondered what would happen if you put one in if you were strictly racing 1/8 to make it so you can change the rear gear from say a 4.10/4.30 to like a 4.56/4.88 or something so you can still have a similar or equal starting line gear ratio and then allow the car to accelerate harder through the rpm range through the 1/8?
The only variables are rpm & torque. And they are both measurable.
November 02, 2021, 11:17 AM
Mike Rietow
How do you measure rpm and torque, you might then say?
By the run replay in your delay box, if you don't have racepak, vs. the time slip.
All you need, nothing fancy.
November 02, 2021, 04:29 PM
T/D6591
My car love's it. I had to put a 1.80 back in while in Vegas but with my 4.10 gear it is too aggressive. Pulled the front tire right out of the beam. As far as a difference my car slows around .03 in the 60ft along with the same in ET when on motor only. It is quicker by about .05 when spraying with the 1.69 over the 1.80,2045lb dragster running 4.36 to 4.40 on motor only.
November 02, 2021, 08:31 PM
jenavet
quote:
The guy we buy all of our trans parts from told me he didn't think the 1.69 was as strong as the 1.80.
Denis LeBlanc
I run the sonnax 1.69 planetary with the ring gear stabilizer upgrade and ran some high 3.70 and some 5.96 1/4 passes and she holds up fine.
November 09, 2021, 02:07 PM
Mike Rietow
This is a Sonnax extreme 1.69, I picked this up for $400, with 20 laps on it.
I bet they're OVER $2000 dollars now.
Went 1.27 60ft on a 10 x 28 bias tire at 3200 lbs off the trailer n/a 23 sbc, with a set of Brodix T1 heads.
I'd like to see someone match that.
November 10, 2021, 09:58 AM
Yellow Ticket
I've debated about the 1.69, but maybe for an odd reason. I have the OEM 1.76's going 6.15-6:30, but in a 97" WB ladder bar car, I can't launch at 4500+ or it will be, lets say, really dependent on the wheelie bars. I'm not too concerned about ET, and my SLR wouldn't be as affected as going form 1.80 to 1.69, since I'm at 1.76 now, but those days might be numbered..
