Hutch ????

[jrsfast84]

on a th400 w/reverse valve body,w/brake, can i kill the car to save the motor, pull the paracute, and go back threw the gears from 3rd to neutral, without hurting the trans. thanks

[Hutch]

Its really bad practice, there is a possibility depending on what speed you click off the motor and neutral the trans of having a failure. If you have to shut the motor off at least get the car way down in speed before you move that shifter from 3rd. Every time I hear of a car being neutralled there is usually a problem that shows up in the trans sooner than later.

Take care ,Hutch

[jrsfast84]

Its really bad practice, there is a possibility depending on what speed you click off the motor and neutral the trans of having a failure. If you have to shut the motor off at least get the car way down in speed before you move that shifter from 3rd. Every time I hear of a car being neutralled there is usually a problem that shows up in the trans sooner than later.

Take care ,Hutchthe reason i asked is because at my local track there's a short shut down and i lose oil pressure, clicking the car off at 148mph. motor is still turning, and then pulling the chute, could that hurt the motor worse,then moving from 3rd to get to neutral. thanks.

[Jim Monson]

I click mine off all the time. Just kill the ignition. Leave the fan and water pumps running. I put a powerglide in neutral once at top end. All I can say is that scatter shields work!

[Tuff Guy]

I click mine off all the time. Just kill the ignition. Leave the fan and water pumps running. I put a powerglide in neutral once at top end. All I can say is that scatter shields work!

Monson - You are going to get Hutch mad w/bad advice

Turbo 400 NEVER nuetral & NEVER kill the engine !!!!!

Really not recomended w/glides either,but still lots of people do it .

I very strongly recomend against it no matter w/anyone says.

Ride it down in high gear.

[jrsfast84]

I click mine off all the time. Just kill the ignition. Leave the fan and water pumps running. I put a powerglide in neutral once at top end. All I can say is that scatter shields work!

Monson - You are going to get Hutch mad w/bad advice

Turbo 400 NEVER nuetral & NEVER kill the engine !!!!!

Really not recomended w/glides either,but still lots of people do it .

I very strongly recomend against it no matter w/anyone says.

Ride it down in high gear.with the chute out, would that hurt the motor worse then not using the chute. if oil pressure says " 0 " that tells me no oil getting pumped. that sounds like sooner or later something going to go. thanks.

[Jim Monson]

Got's to read da plugs. That means cut it clean going through the traps. I've tried to hurt Hutch's tans and had no success. I'll keep shutting it off at top end.

[Monty Mikho]

JR, you may want to look into installing oil drain backs from the heads to the pan. Also look into revising the oil drain back in the valley area. Are you using restictors in the motor? If it is going to zero at the shut down area it may mean you are running out of oil before then or sucking air at top end. Try adding an addition quart of oil to the motor and see if it helps. If it does you will need to make some mods to oil drain backs. Otherwise look at the oil pick up height, around the mounting point of the pick up for cracks or leaks or the oil pan trap door. Even with zero oil pressure while the motor is off will not do the damage it would under power..

[Hutch]

You may want to consider an oil accumulator, it will help maintain oil pressure during shutdown. If the oil pressure falls instantly to zero at the hit of the chute I would look at the oil pan baffles to make sure they are functioning properly.
If you have to: make the pass, pull the chutes wait till you see the oil pressure dropping ,then shut off the motor ,at least you have slowed way down and are decelerating quickly and are likely down to 60 mph or so. Neutraling or shutting down right at the traps is a bad deal.

Hope this helps ,Hutch

[Hutch]

Monson, Read the plugs? I thought you were doing that at the end of the season , not every pass.
Be careful with that neutral deal.

[Jim Monson]

I don't put it in neutral any more. Not after the explosion. But, if I pull the chute, let it slow down a little, and kill it, I get a good plug read. If I idle around the corner it throws a little crap on the plugs. Makes them harder to read.

I do not do this all of the time. If I'm not reading plugs I'll idle around the corner, then shut the motor off. I keep the water pump and fan running so I don't boil the water in the heads. After I pick up the chute I start the car back up and drive to the scales. Driving back seems to cool the trans down. Must be that neato tranny cooler you helped me design Hutch. :-D

[Six_Shooter]

Just curios, what happens when you put the tanny in nuetral at high speed that damages them?

[Monty Mikho]

You have EFI.. Put 8 more degrees of timing in it and tune to 15 to 1 air fuel ratio under 3000 RPM.. Plugs will look newer than they came outta the box.. Not sure if it works on a turbo car but it worked nice on a nitrous deal.. :D

[85Camaro]

This has always seem to be a debate with what to do and in what order after shutdown. When taking a plug reading, I have always let off of the throttle and then killed the ignition system(I hear to shut off the fuel pump on a EFI engine) then slowed the car down.

I don't see any problem in shutting the motor off but I'm no expert, can someone explain why shutting the engine off after a pass is bad? Thanks

[Jim Monson]

Hutch can explain it better but I locked up the band and threw the adjuster out of the case. Literaly scattered the transmission case.

Monty, I'll start taking tuning advice from you when you start going faster than me. :smt064

[Six_Shooter]

Just to clarify, when you guys aresaying sit's bad to put the tranny in nuetral at high speed, does it matter if the engine is running or not?

[Hutch]

Its pretty simple, when you throw a trans in neutral at speed parts internally are acelerated , if you now shut off the motor ,they are accelerated even faster because now you have the driveshaft as the input to the trans. If the part that is being caused to spin faster than normal reaches its burst speed (usually around 10-14K rpm) it will explode and they go off like a bomb. This happens either at the starting line or at the finish line, depending on the cicumstances.

This was also covered in this thread: http://yellowbullet.com/v-web/bulletin/bb/viewtopic.php?t=3925

Hope this helps ,Hutch

[Six_Shooter]

I'm really starting to think I should keep my manual. :lol:

Thanks Hutch.

Now is there anyway to help prevent this from happening? The problems that occur when traction is lost? Are there parts that will sustain these high speeds?