Whats the longest I should be on the brake?Please help!

TurboTA · 08-26-2008, 02:54 PM

I have a turbo car sbc single turbo. The converter I have is way to tight on the bottom and only revs to 2400rpms on the brake. It will build five pounds of boost in like 10 secs on the brake but then it fights the converter and bogs down the motor untill it get to around 4000rpm. It leaves like a dog on 5 pounds.

I can get it to build 10 pounds of boost but then it is on the brake for 20 secs. It leaves good then though.

I have talked to my converter builder and he is going to restall the converter but I want go racing this weekend before the restall. If I stay on it that long (20secs for two or three passes with time in between to cool the trans and a fluid change) will I for sure burn up the trans. I am going to take fresh fluid out and change it once while I'm out there at the track and also put fresh fluid in before I go.

Horndog · 08-26-2008, 04:16 PM

Hell of a gamble imo.

If you decide to gamble, be sure to also take with you a couple of those small squirel cage blowers that you can get at Home Depot or Lowes and a good generator. You'll need to blow ambient air on the trans pan and converter after each pass to take heat out.

Good luck.

mrdragster1970 · 08-26-2008, 04:39 PM

.

As short as possible. As mentioned, you are going to repeatedly put a bunch of heat in the trans.
You are not doing the life of your fluid much of a favor. Good luck.

.

JustinOlson · 08-26-2008, 06:43 PM

Throw a little 50 shot at it on the brake. That will get it spooled instantly

Hutch · 08-27-2008, 02:52 AM

Quote:

Originally Posted by TurboTA

I have a turbo car sbc single turbo. The converter I have is way to tight on the bottom and only revs to 2400rpms on the brake. It will build five pounds of boost in like 10 secs on the brake but then it fights the converter and bogs down the motor untill it get to around 4000rpm. It leaves like a dog on 5 pounds.

I can get it to build 10 pounds of boost but then it is on the brake for 20 secs. It leaves good then though.

I have talked to my converter builder and he is going to restall the converter but I want go racing this weekend before the restall. If I stay on it that long (20secs for two or three passes with time in between to cool the trans and a fluid change) will I for sure burn up the trans. I am going to take fresh fluid out and change it once while I'm out there at the track and also put fresh fluid in before I go.

If you spool that car for 20 seconds then make a pass , you will have cooler output temperature of over 450 degrees and the trans will be ready to catch fire.
I would not recommend you even try this in fear of you catching on fire , wrecking the car and/or someone else.
Its not worth it just to make a pass.

Hutch

RBPOWER · 08-27-2008, 05:34 AM

my transmition man is on my case if I stay on the brake for more than five secs or so

WardRacing408 · 08-27-2008, 03:59 PM

Have you exhausted all efforts in attempt to build more boost quicker while staging the car...3 step, retarded timing, ?

Beyond · 08-27-2008, 04:20 PM

Somebody post that pic of Turbo Todd's fireball at Tulsa to help make the point here...

Horndog · 08-27-2008, 07:05 PM

Was this a tranny oil fire ?

Beyond · 08-27-2008, 07:12 PM

Yup, a huge one - looked like a Jet Dragster when they are show boating..

Horndog · 08-27-2008, 07:21 PM

Damn !!!

TwinT66 · 08-27-2008, 09:58 PM

here is my video.I was way to long on the brake

:http://videos.streetfire.net/video/g...opi_128313.htm

Tony

JUICED96Z · 08-28-2008, 01:52 AM

Quote:

Originally Posted by TwinT66

here is my video.I was way to long on the brake

:http://videos.streetfire.net/video/g...opi_128313.htm

Tony

Loovvveedd the dune buggy HAHAHA

Yeah don't stay on the brake that long....

john@ATI · 08-28-2008, 03:46 PM

the converter is acting like a dyno loading the motor , only 1/3 of the fliud goes to the cooler. I have watched people set on the brake way too long trying to biuld boost and kill the converter. This is one of the reasons for a steel stator, the aluminum stator would melt out of the converter (aluminum melts at 1150). we only like to see 5 seconds on the converter. Back when small blocks ruled and big turbos were the norm. fires we every round once you had a steel stator you could set on the break till it melted the seal out of the front pump, then a big fire. now days with the tuning ability and the use of bigger cube motors biulding boost doesnt seem to be much of a problem.

Beyond · 08-28-2008, 03:54 PM

Another thing to note is that regular ATF has a low flashpoint, between 320 and 375 degrees in most brands.

08-26-2008, 02:54 PM	#1
TurboTA Junior Member Launchin Join Date: Nov 2006 Posts: 314	I have a turbo car sbc single turbo. The converter I have is way to tight on the bottom and only revs to 2400rpms on the brake. It will build five pounds of boost in like 10 secs on the brake but then it fights the converter and bogs down the motor untill it get to around 4000rpm. It leaves like a dog on 5 pounds. I can get it to build 10 pounds of boost but then it is on the brake for 20 secs. It leaves good then though. I have talked to my converter builder and he is going to restall the converter but I want go racing this weekend before the restall. If I stay on it that long (20secs for two or three passes with time in between to cool the trans and a fluid change) will I for sure burn up the trans. I am going to take fresh fluid out and change it once while I'm out there at the track and also put fresh fluid in before I go. Last edited by TurboTA; 08-26-2008 at 02:55 PM.

08-26-2008, 04:16 PM	#2
Horndog Senior Member Smoked Another SBC Join Date: Nov 2007 Location: Terre Haute, Indiana Posts: 11,139	Hell of a gamble imo. If you decide to gamble, be sure to also take with you a couple of those small squirel cage blowers that you can get at Home Depot or Lowes and a good generator. You'll need to blow ambient air on the trans pan and converter after each pass to take heat out. Good luck. __________________ Jim Horner If you don't stand for something, you will follow anything... Quoted by FDR Government by organized money is just as dangerous as government by organized mob. Quoted by JoDon All you need to know is that there are no leaders left ... and that seems to apply to both politics and business. Politics has been dumbed down to high school level popularity contests, and business is looking for the next get rich quick scheme.

08-26-2008, 04:39 PM	#3
mrdragster1970 A/PM 368E T/S 368E Smoked another BBC Join Date: Jan 2008 Location: Chicago, far SW suburbs Posts: 3,414	. As short as possible. As mentioned, you are going to repeatedly put a bunch of heat in the trans. You are not doing the life of your fluid much of a favor. Good luck. . __________________ Used BBC-Dragrace-Trucks-Trailers 4 sale, personally listed items only. Parts For Sale "Testing-Kind of boring, No N2O, only 1.10's 60 footers" Click here to see Video . Pictures of '70 1/2 Rally Sport Photo's For my babies, we will always remember. In memory of Chris Costa, you will never meet a nicer guy. I will never forget your kindness, when I needed it.

08-27-2008, 05:34 AM	#6
RBPOWER Junior Member Spooled up Join Date: Jun 2007 Location: Tallahassee, Fl. Posts: 103	my transmition man is on my case if I stay on the brake for more than five secs or so __________________ Tallahasse, FL.

08-27-2008, 04:20 PM	#8
Beyond Member Pullin gears Join Date: Mar 2005 Location: Kansas Posts: 637	Somebody post that pic of Turbo Todd's fireball at Tulsa to help make the point here... __________________ Find me @ Dragstuff.com - JohnHeard.com - Bey.com

08-26-2008, 06:43 PM	#4
JustinOlson Junior Member Launchin Join Date: Dec 2007 Posts: 318	Throw a little 50 shot at it on the brake. That will get it spooled instantly

08-27-2008, 03:59 PM	#7
WardRacing408 Junior Member Launchin Join Date: Feb 2008 Location: Regina, SK, Canada Posts: 338	Have you exhausted all efforts in attempt to build more boost quicker while staging the car...3 step, retarded timing, ?

08-27-2008, 07:05 PM	#9
Horndog Senior Member Smoked Another SBC Join Date: Nov 2007 Location: Terre Haute, Indiana Posts: 11,139	Was this a tranny oil fire ? __________________ Jim Horner If you don't stand for something, you will follow anything... Quoted by FDR Government by organized money is just as dangerous as government by organized mob. Quoted by JoDon All you need to know is that there are no leaders left ... and that seems to apply to both politics and business. Politics has been dumbed down to high school level popularity contests, and business is looking for the next get rich quick scheme.

08-27-2008, 07:12 PM	#10
Beyond Member Pullin gears Join Date: Mar 2005 Location: Kansas Posts: 637	Yup, a huge one - looked like a Jet Dragster when they are show boating.. __________________ Find me @ Dragstuff.com - JohnHeard.com - Bey.com

08-27-2008, 07:21 PM	#11
Horndog Senior Member Smoked Another SBC Join Date: Nov 2007 Location: Terre Haute, Indiana Posts: 11,139	Damn !!! __________________ Jim Horner If you don't stand for something, you will follow anything... Quoted by FDR Government by organized money is just as dangerous as government by organized mob. Quoted by JoDon All you need to know is that there are no leaders left ... and that seems to apply to both politics and business. Politics has been dumbed down to high school level popularity contests, and business is looking for the next get rich quick scheme.

08-27-2008, 09:58 PM	#12
TwinT66 Junior Member Pre-Staged Join Date: Sep 2007 Location: Swansea Ma Posts: 73	here is my video.I was way to long on the brake :http://videos.streetfire.net/video/g...opi_128313.htm Tony

08-28-2008, 03:46 PM	#14
john@ATI Junior Member Burnout box Join Date: Jan 2008 Posts: 47	the converter is acting like a dyno loading the motor , only 1/3 of the fliud goes to the cooler. I have watched people set on the brake way too long trying to biuld boost and kill the converter. This is one of the reasons for a steel stator, the aluminum stator would melt out of the converter (aluminum melts at 1150). we only like to see 5 seconds on the converter. Back when small blocks ruled and big turbos were the norm. fires we every round once you had a steel stator you could set on the break till it melted the seal out of the front pump, then a big fire. now days with the tuning ability and the use of bigger cube motors biulding boost doesnt seem to be much of a problem.

08-28-2008, 03:54 PM	#15
Beyond Member Pullin gears Join Date: Mar 2005 Location: Kansas Posts: 637	Another thing to note is that regular ATF has a low flashpoint, between 320 and 375 degrees in most brands. __________________ Find me @ Dragstuff.com - JohnHeard.com - Bey.com

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