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1.69 1st gear
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DRR Trophy
posted
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 future

This message has been edited. Last edited by: Nitrous1,
 
Posts: 75 | Location: nitrousville | Registered: January 30, 2012Reply With QuoteReport This Post
DRR Pro
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I know several people that tried it an switched back real quick….
 
Posts: 1251 | Location: USA | Registered: December 04, 2008Reply With QuoteReport This Post
DRR S/Pro
Picture of "The Bender"
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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'

2017 Bradenton Heads Up Madness
Open Outlaw Champ

2018 PDRA T/D #5
2019 PDRA T/D #2

2020 Retired From T/D Competition....

2020 Bradenton NMCA Hemi Shootout Winner

2021 getting back into bracket racing with a Gen3 Hemi powered 87 Cutlass.
 
Posts: 3096 | Location: Yes | Registered: July 08, 2009Reply With QuoteReport This Post
DRR Trophy
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quote:
Originally posted by WHOMPWHOMP:
I know several people that tried it an switched back real quick….


Slow, inconsistent, or other issues?
 
Posts: 75 | Location: nitrousville | Registered: January 30, 2012Reply With QuoteReport This Post
DRR Pro
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quote:
Slow, inconsistent, or other issues?

none of the above if your combo is correct
 
Posts: 1424 | Location: united states | Registered: January 16, 2006Reply With QuoteReport This Post
DRR Pro
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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
 
Posts: 1251 | Location: USA | Registered: December 04, 2008Reply With QuoteReport This Post
DRR Sportsman
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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

 
Posts: 465 | Location: Manchester, NH | Registered: February 03, 2006Reply With QuoteReport This Post



DRR Top Comp
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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.
 
Posts: 9398 | Location: Madeira Beach Fl. | Registered: June 12, 2018Reply With QuoteReport This Post
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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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Posts: 2497 | Location: Gilmer, Texas | Registered: June 25, 2002Reply With QuoteReport This Post
DRR Trophy
Picture of Rodney Pryor
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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.
 
Posts: 116 | Location: Richmond, VA | Registered: December 07, 2002Reply With QuoteReport This Post
DRR Trophy
Picture of NC3x58
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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
 
Posts: 410 | Location: Ohio | Registered: December 28, 2013Reply With QuoteReport This Post
DRR Top Comp
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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.
 
Posts: 9398 | Location: Madeira Beach Fl. | Registered: June 12, 2018Reply With QuoteReport This Post
DRR Top Comp
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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.
 
Posts: 9398 | Location: Madeira Beach Fl. | Registered: June 12, 2018Reply With QuoteReport This Post
DRR Pro
Picture of T/D6591
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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.


 
Posts: 1708 | Location: Portland,Oregon | Registered: January 18, 2009Reply With QuoteReport This Post



DRR Pro
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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.
 
Posts: 1424 | Location: united states | Registered: January 16, 2006Reply With QuoteReport This Post
DRR Top Comp
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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.


 
Posts: 9398 | Location: Madeira Beach Fl. | Registered: June 12, 2018Reply With QuoteReport This Post
DRR Trophy
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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..
 
Posts: 287 | Location: Midwest  | Registered: January 12, 2015Reply With QuoteReport This Post
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