DragRaceResults.Com    Bracket Talk    Bracket Talk Forum  Hop To Forum Categories  Tech Talk - by Abruzzi    615 SR20 - 4.11 or 4.29
Page 1 2 3 4 5 
Go
New
Find
Notify
Tools
Reply
  
615 SR20 - 4.11 or 4.29
 Login/Join
 
DRR Trophy
posted
Working on new dragster build for super comp and bracket racing with 615 SR20 BBC. Looking for feedback on people running or tried both 4.11 and 4.29 rear gear with big tire. I can do the math on rpm difference, but looking for real world feedback from the forum. Thanks.
 
Posts: 4 | Location: Somewhere | Registered: June 07, 2012Reply With QuoteReport This Post
DRR Elite
posted Hide Post
4.29 minimum
 
Posts: 13522 | Location: NJ | Registered: August 20, 2000Reply With QuoteReport This Post
DRR Top Comp
posted Hide Post
For who'm it may concern,,,,, The "throw the kitchen sink at it" new Big Bubba 2.0 Radial doesn't grow.
 
Posts: 9398 | Location: Madeira Beach Fl. | Registered: June 12, 2018Reply With QuoteReport This Post
DRR Pro
Picture of TORQIN
posted Hide Post
Agree with Ed, 4.29.

4.11 will be slower/calmer
 
Posts: 1754 | Location: Houston, Tx. | Registered: November 27, 2008Reply With QuoteReport This Post
DRR Pro
posted Hide Post
I went from 4.30 to 4.10 No et loss at all….so I say converter was the factor…definitely calmer which is needed in certain times of the year I’d go 4:10…IMO
 
Posts: 1268 | Location: USA | Registered: December 04, 2008Reply With QuoteReport This Post
DRR Elite
posted Hide Post
Yes, you have or had the wrong converter
 
Posts: 13522 | Location: NJ | Registered: August 20, 2000Reply With QuoteReport This Post
DRR Pro
Picture of TORQIN
posted Hide Post
Going teens, 4.20s and 30s I think the 4.11 wwould be preferred.

Avg 615 SR20 will/can run 40s most of the year, for those reasons I like the 4.29
 
Posts: 1754 | Location: Houston, Tx. | Registered: November 27, 2008Reply With QuoteReport This Post



DRR Top Comp
posted Hide Post
You can cross 7200 rpm's at 158 mph with a no tire growth new Big Bubba radial 2.0 in conjunction with a converter that slips 10%.

I think 12 - 13% is probably more realistic though, maybe more.

When you go to a no tire growth radial, everything you think you learned with tire growth kinda goes up in smoke, because the exact amount of tire growth in play is unknown.

I moved 3 different gear ratio's in and out of my rearend housing last year discovering this to be true, on a radial.

Take it for what it's worth, everyone gonna be on Big Bubba radial 2.0 when it hits the market, from what I hear.

You can throw the kitchen sink at it no problem.

This message has been edited. Last edited by: Mike Rietow,
 
Posts: 9398 | Location: Madeira Beach Fl. | Registered: June 12, 2018Reply With QuoteReport This Post
DRR Pro
posted Hide Post
quote:
Originally posted by TORQIN:
Going teens, 4.20s and 30s I think the 4.11 wwould be preferred.

Avg 615 SR20 will/can run 40s most of the year, for those reasons I like the 4.29
This slow like ED go 4.30…fast like TORQIN,LEMEN an WHOMP go 4.10
 
Posts: 1268 | Location: USA | Registered: December 04, 2008Reply With QuoteReport This Post
DRR Top Comp
posted Hide Post
Big Bubba radial 2.0 looks pretty cool too, I think.

I have a video of a 4.40 car going down on it, but have been told don't make it public.

I can tell you what I was told though, it's a BMF.
 
Posts: 9398 | Location: Madeira Beach Fl. | Registered: June 12, 2018Reply With QuoteReport This Post
DRR Pro
Picture of rusty
posted Hide Post
4.29 in super comp it will be like a rocket when stop goes off


honesty is the best policy,insanity is a better deffense
1.036, 6.16@ 224

 
Posts: 1428 | Location: texas | Registered: February 17, 2006Reply With QuoteReport This Post
DRR Pro
Picture of TORQIN
posted Hide Post
quote:
Originally posted by Mike Rietow:
Big Bubba radial 2.0 looks pretty cool too, I think.

I have a video of a 4.40 car going down on it, but have been told don't make it public.

I can tell you what I was told though, it's a BMF.


Good news! Hopefully they hold air
 
Posts: 1754 | Location: Houston, Tx. | Registered: November 27, 2008Reply With QuoteReport This Post
DRR Trophy
Picture of DragRaceSolutions.com
posted Hide Post
LOL - I got 4.56's !




Home of Collector Tethers ~ Just-N-Time Buttons & Drag Race Solutions products

www.DragRaceSolutions.com
Sales@DragRaceSolutions.com
 
Posts: 85 | Location: Tennessee, U.S.A. | Registered: July 22, 2013Reply With QuoteReport This Post
DRR Elite
posted Hide Post
So does a good friend of mine.

Scott…KNOWS and there ain’t nothing slow about my dragster!
 
Posts: 13522 | Location: NJ | Registered: August 20, 2000Reply With QuoteReport This Post



DRR Pro
posted Hide Post
quote:
Originally posted by DragRaceSolutions.com:
LOL - I got 4.56's !
Well you’ll be taking TIMING out of it….if you plan on 4.20’s
 
Posts: 1268 | Location: USA | Registered: December 04, 2008Reply With QuoteReport This Post
DRR S/Pro
Picture of Lenny5160
posted Hide Post
I've been running 33.5" tires with a 4.11 forever. I'm switching to 34.5" tires this season and debated moving to 4.29 at the same time, but I'm going to stick with the 4.11 to start.

If I was 1/8 mile bracket racing, it would be a no-brainer to go up with the gear but I'm primarily running 1/4 mile Super Comp. Currently coming off the stop in Low gear and shifting/trapping both at 7500 with a conventional 632.


Tony Leonard
 
Posts: 3183 | Location: Inver Grove Heights, MN | Registered: March 18, 2004Reply With QuoteReport This Post
DRR Pro
Picture of TORQIN
posted Hide Post
quote:
Originally posted by WHOMPWHOMP:
quote:
Originally posted by DragRaceSolutions.com:
LOL - I got 4.56's !
Well you’ll be taking TIMING out of it….if you plan on 4.20’s


I think Scott has a 1.58 low gear set in trans? Could get away without pulling timing?

Even the 4.11 gear requires pulling timing at times going:

.987
2.739
4.225
165.10

Btw the engine that ran this in Cory's dragster 2 months ago is currently for sale...(cheap plug)
 
Posts: 1754 | Location: Houston, Tx. | Registered: November 27, 2008Reply With QuoteReport This Post
DRR Pro
Picture of rusty
posted Hide Post
i ran 4.44 nascar pullouts for a while worked really well for 1/8 and super comp


honesty is the best policy,insanity is a better deffense
1.036, 6.16@ 224

 
Posts: 1428 | Location: texas | Registered: February 17, 2006Reply With QuoteReport This Post
DRR Pro
posted Hide Post
quote:
Originally posted by TORQIN:
quote:
Originally posted by WHOMPWHOMP:
quote:
Originally posted by DragRaceSolutions.com:
LOL - I got 4.56's !
Well you’ll be taking TIMING out of it….if you plan on 4.20’s


I think Scott has a 1.58 low gear set in trans? Could get away without pulling timing?

Even the 4.11 gear requires pulling timing at times going:

.987
2.739
4.225
165.10

Btw the engine that ran this in Cory's dragster 2 months ago is currently for sale...(cheap plug)
No wonder his stuff wouldn’t run lol…lol…
 
Posts: 1268 | Location: USA | Registered: December 04, 2008Reply With QuoteReport This Post
DRR Pro
posted Hide Post
quote:
Originally posted by TORQIN:
quote:
Originally posted by WHOMPWHOMP:
quote:
Originally posted by DragRaceSolutions.com:
LOL - I got 4.56's !
Well you’ll be taking TIMING out of it….if you plan on 4.20’s


I think Scott has a 1.58 low gear set in trans? Could get away without pulling timing?

Even the 4.11 gear requires pulling timing at times going:

.987
2.739
4.225
165.10

Btw the engine that ran this in Cory's dragster 2 months ago is currently for sale...(cheap plug)
For sure
 
Posts: 1268 | Location: USA | Registered: December 04, 2008Reply With QuoteReport This Post
  Powered by Social Strata Page 1 2 3 4 5  
 

DragRaceResults.Com    Bracket Talk    Bracket Talk Forum  Hop To Forum Categories  Tech Talk - by Abruzzi    615 SR20 - 4.11 or 4.29

© DragRaceResults.com 2024