I had an issue with my car, the motor developed a knock after its last pass. took it out and the trust bearing was gone. the crank was pushed forward and the crank lobe was starting to rub the main cap. it showed no signs of detonation on the pistons, and the heads had not pushed any water.
the motor is a 6.0 iron block, weisco 8.1:1 pistons, 6.0 heads. i have an 88mm turbo, i did not have a two step when i broke it. trans is a T400, rear is a moser 9". it was running around 11psi of boost. i ran the car about 10 times without an issue on the old 10 bolt.
i installed the 9" and went to the track use the T-brake. i spooled it at 50% throttle to about 1-2psi and launched. the car pulled great.
next pass i stood on the t-brake longer and had it floored for about 7-10 second, the boost shot to 10psi and i launched, the car instantly smoked the tires and then developed a knock after driving to the pits.
Anyone know if it was my fault or what caused this. the machinist said he thinks i ballooned the converter. the converter is a pro edge and andre is going to freshen it up. Since i have purchases a two step to help the launch.
7-10 seconds is a lifetime on the t brake,you should be able to come up on boost in a second or 2 at the most on the brake.there are several things you can do to make it spool faster.
But that def killed your converter and it then killed you thrust.Some converter brands are worse than others when it come to beating out the thrust.ATI has one of the best when it come to thrust issues on a turbo car.
__________________ www.virginiaspeed.comcustom engines for street or race,tuning,installs,fabrication. check our our online store-i'm adding new products every day http://shop.virginiaspeed.com/main.sc757-468-5101 1979 Z28 Outlaw 10.5-670bbc twin promod 94's Crew Chief,engine builder,tuner of Phil Thomas's
LSX powered Mustang"The Renegade" 7.29, 198mph-best 1/8 et.4.70 @ 164mph 315 radials at 3275lbs
7-10 seconds is a lifetime on the t brake,you should be able to come up on boost in a second or 2 at the most on the brake.there are several things you can do to make it spool faster.
But that def killed your converter and it then killed you thrust.Some converter brands are worse than others when it come to beating out the thrust.ATI has one of the best when it come to thrust issues on a turbo car.
i just checked the video of the run, it was around 3-5 seconds but it was to the floor with no 2 step. would that still of toasted the converter?
Yes that could have done it, that is a lot of time to build heat and the torque you were making at 10psi was enough to do it. Could have been a long time coming but that finished it off.
I may have posted this in a different post of yours but here it is again...
Foe every SECOND you are on the trans brake, you add 30-50* of heat to the fluid. So average trans operating temp is 125*-200*, add another 90-250*!!!!
That trans needs to be checked too. Converter might need more then just a freshening, like the front pump cover and housing might be toast. I would definitely go over it with a fine tooth comb.
t400s are also pretty viscious about pushing the converter forward from what I've read...
__________________ 1999 Pewter T/A | Just another slow drag radial car (see here) Virginia Speed 366ci LS2 + big turbo (the little block that could) | 7.99 @ 177.8 (1.36)
Virginia Speed 388ci LS2 + bigger turbo | In Progress
Special Thanks to TheOutlaw1, Phil99vette, Shawn @ Va Speed and MADMAN for all their help
__________________ www.virginiaspeed.comcustom engines for street or race,tuning,installs,fabrication. check our our online store-i'm adding new products every day http://shop.virginiaspeed.com/main.sc757-468-5101 1979 Z28 Outlaw 10.5-670bbc twin promod 94's Crew Chief,engine builder,tuner of Phil Thomas's
LSX powered Mustang"The Renegade" 7.29, 198mph-best 1/8 et.4.70 @ 164mph 315 radials at 3275lbs
i have a hughes flex plate, i was using the adapter for the t400 converter to ls1 flex. im going to have the ls1 snout put on now. what do you mean by water cooled system?
i have a hughes flex plate, i was using the adapter for the t400 converter to ls1 flex. im going to have the ls1 snout put on now. what do you mean by water cooled system?
if you have an A2W intercooler, some put their trans cooler in the water to help pull heat out of the tranny fluid.
__________________ 1999 Pewter T/A | Just another slow drag radial car (see here) Virginia Speed 366ci LS2 + big turbo (the little block that could) | 7.99 @ 177.8 (1.36)
Virginia Speed 388ci LS2 + bigger turbo | In Progress
Special Thanks to TheOutlaw1, Phil99vette, Shawn @ Va Speed and MADMAN for all their help
Probably ballooned the converter. This is one of the reasons why pro racers have spent a lot of time figuring out how to bring up the rpms in a max effort turbo car without burning up transmissions and converters.
t400s are also pretty viscious about pushing the converter forward from what I've read...
psi is too high. It will/can cause this very problem. There are several cures for this.
Here's but 1 thread about this problem. Several of the tranny builders have thier own methods.. This is the 1 I use, from Don Wang. http://www.turbobuick.com/forums/tra...t-bearing.html
i have a hughes flex plate, i was using the adapter for the t400 converter to ls1 flex. im going to have the ls1 snout put on now. what do you mean by water cooled system?
In simple terms, you put your trans cooler in a box and run ice water around it. Most do it with air to water systems, but you can do it with air to air. Cheap insurance. YOu never know when someone is going to try and burn you down on the line.
the trans builder said the converter was not ballooned. what could cause this to happen. can the converter get pushed and not balloon?
once again,alot of its in the converter design,i know the way the stator is made has alot to do with it.One other thing is how much pressure the trans is pushing into the converter.
__________________ www.virginiaspeed.comcustom engines for street or race,tuning,installs,fabrication. check our our online store-i'm adding new products every day http://shop.virginiaspeed.com/main.sc757-468-5101 1979 Z28 Outlaw 10.5-670bbc twin promod 94's Crew Chief,engine builder,tuner of Phil Thomas's
LSX powered Mustang"The Renegade" 7.29, 198mph-best 1/8 et.4.70 @ 164mph 315 radials at 3275lbs
once again,alot of its in the converter design,i know the way the stator is made has alot to do with it.One other thing is how much pressure the trans is pushing into the converter.
im going to restrict the feed down to 7/64", over on the buick site most agree that will help with the high pressure issue
Thrust bearing worn? what causes it. 
| In Progress
Converter charge.. 
