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How does one properly launch an auto by utilizing the torque converter?

I

InlineFive

Diamond Member
How is this done properly? I have a '95 850 Turbo with an automatic transmission.

And yes, I did check with Google first.
 
give enough gas to not break the tires then mash on it.

On the 850 turbo I had way back it was about 3/4 throttle then all the way.
 
Yeah, should be around 3/4 throttle to launch and then just floor it of course

I'd get an 850 Turbo if they made more manuals... it's too bad they don't...
 
Thanks for the fast responses!

One more question, I read that the stall RPM for these cars is at about 2900RPM. Is that the optimal time to release the brake or is it irrelevant?
 
Originally posted by: spidey07
Oh.

Don't be stupid and try to hold the brake while you press the gas.

You'll be limping along sans turbo.
Click to expand...

Do you mean hold the emergency brake?

Basically what I gather is this:

1. Hold down brake pedal.
2. Press gas to build up torque.
3. Release brake and mash gas.
 
Originally posted by: spidey07
Oh.

Don't be stupid and try to hold the brake while you press the gas.

You'll be limping along sans turbo.
Click to expand...

It's a shame you have no idea what you're talking about.

You should powerbrake it somewhat to spool the turbo, basically, press the brake hard, and press the gas SLOWLY until you the car starts overpowering the brakes. When the lighyt goes green, floor it, and release the brake pedal.

<-- Has owned and raced Turbo Buicks (ie Grand National) for over 7 years.

Although this is written for Turbo Buicks - much of it may help you..

http://gnttype.org/techarea/sunday.html
 
Originally posted by: SuperSix
Originally posted by: spidey07
Oh.

Don't be stupid and try to hold the brake while you press the gas.

You'll be limping along sans turbo.
Click to expand...

It's a shame you have no idea what you're talking about.

You should powerbrake it somewhat to spool the turbo, basically, press the brake hard, and press the gas SLOWLY until you the car starts overpowering the brakes. When the lighyt goes green, floor it, and release the brake pedal.

<-- Has owned and raced Turbo Buicks (ie Grand National) for over 7 years.

Although this is written for Turbo Buicks - much of it may help you..

http://gnttype.org/techarea/sunday.html
Click to expand...

Thanks for the clear cut reply. Appreciate it. 🙂
 
Originally posted by: SuperSix
Originally posted by: spidey07
Oh.

Don't be stupid and try to hold the brake while you press the gas.

You'll be limping along sans turbo.
Click to expand...

It's a shame you have no idea what you're talking about.

You should powerbrake it somewhat to spool the turbo, basically, press the brake hard, and press the gas SLOWLY until you the car starts overpowering the brakes. When the lighyt goes green, floor it, and release the brake pedal.

<-- Has owned and raced Turbo Buicks (ie Grand National) for over 7 years.

Although this is written for Turbo Buicks - much of it may help you..

http://gnttype.org/techarea/sunday.html
Click to expand...

Its a shame that I owned that car (850 turbo) and speak from experience and not what you read on the web.

dumbass.

I swear this board is severely flooded with talking out of their ass and what they read on the intarweb.

-edit- sorry. I was a little harsh. We all know that the turbo in the grand national is much, much, much better than what the 850 has.
 
Originally posted by: spidey07
Originally posted by: SuperSix
Originally posted by: spidey07
Oh.

Don't be stupid and try to hold the brake while you press the gas.

You'll be limping along sans turbo.
Click to expand...

It's a shame you have no idea what you're talking about.

You should powerbrake it somewhat to spool the turbo, basically, press the brake hard, and press the gas SLOWLY until you the car starts overpowering the brakes. When the lighyt goes green, floor it, and release the brake pedal.

<-- Has owned and raced Turbo Buicks (ie Grand National) for over 7 years.

Although this is written for Turbo Buicks - much of it may help you..

http://gnttype.org/techarea/sunday.html
Click to expand...

Its a shame that I owned that car (850 turbo) and speak from experience and not what you read on the web.

dumbass.
Click to expand...

spidey...you kill..me...:laugh:
 
Originally posted by: spidey07
Originally posted by: SuperSix
Originally posted by: spidey07
Oh.

Don't be stupid and try to hold the brake while you press the gas.

You'll be limping along sans turbo.
Click to expand...

It's a shame you have no idea what you're talking about.

You should powerbrake it somewhat to spool the turbo, basically, press the brake hard, and press the gas SLOWLY until you the car starts overpowering the brakes. When the lighyt goes green, floor it, and release the brake pedal.

<-- Has owned and raced Turbo Buicks (ie Grand National) for over 7 years.

Although this is written for Turbo Buicks - much of it may help you..

http://gnttype.org/techarea/sunday.html
Click to expand...

Its a shame that I owned that car (850 turbo) and speak from experience and not what you read on the web.

dumbass.

I swear this board is severely flooded with talking out of their ass and what they read on the intarweb.
Click to expand...

It's a shame that both of you jumped to each other's throats so quickly.

Otherwise, I am a little confused by your response about not holding the brake. It seems to me that pressing the brake pedal is essential whilst gently accelerating the engine. Otherwise it seems like a moot point.
 
You won't hurt the turbo at all by holding the brake.

What you _will_ do is generate a _LOT_ of heat in the torque converter (it's not a 2900 RPM stall converter, a 2900 RPM stall converter won't begin pushing the car until 2900 RPM, meaning there would be no creep at idle) and potentially blow out some seals in the transmission. Unless you have messed with the transmission for racing, you should not "power brake" past maybe 1,500 RPM, and even then you should not do it regularly.

ZV

EDIT: The above answer assumes that you want your transmission to last 100,000 miles or more. If you don't mind a 10,000 mile (or less) transmission life, by all means hold the brake on for as long as you like.
 
Originally posted by: PorBleemo
Originally posted by: spidey07
Originally posted by: SuperSix
Originally posted by: spidey07
Oh.

Don't be stupid and try to hold the brake while you press the gas.

You'll be limping along sans turbo.
Click to expand...

It's a shame you have no idea what you're talking about.

You should powerbrake it somewhat to spool the turbo, basically, press the brake hard, and press the gas SLOWLY until you the car starts overpowering the brakes. When the lighyt goes green, floor it, and release the brake pedal.

<-- Has owned and raced Turbo Buicks (ie Grand National) for over 7 years.

Although this is written for Turbo Buicks - much of it may help you..

http://gnttype.org/techarea/sunday.html
Click to expand...

Its a shame that I owned that car (850 turbo) and speak from experience and not what you read on the web.

dumbass.

I swear this board is severely flooded with talking out of their ass and what they read on the intarweb.
Click to expand...

It's a shame that both of you jumped to each other's throats so quickly.

Otherwise, I am a little confused by your response about not holding the brake. It seems to me that pressing the brake pedal is essential whilst gently accelerating the engine. Otherwise it seems like a moot point.
Click to expand...

SuperSix is indeed correct on how to launch on his very nice car that I'm sure he is very familiar with, with a motor/turbo built to run. I love the grand nationals.

The 850 is not such a car.

Try it with your 850. Just make sure you have a cell phone handy when you pop a hose. They are not the same animal. Too much gas on the 850 and POP! No more turbo. At least on mine way back when it was a new car.

You're not really hurting anything, just too much pressure.
 
Originally posted by: spidey07
SuperSix is indeed correct on how to launch on his very nice car that I'm sure he is very familiar with, with a motor/turbo built to run. I love the grand nationals.

The 850 is not such a car.

Try it with your 850. Just make sure you have a cell phone handy when you pop a hose. They are not the same animal. Too much gas on the 850 and POP! No more turbo. At least on mine way back when it was a new car.

You're not really hurting anything, just too much pressure.
Click to expand...
Spidey, unless the boost controller is malfunctioning, the wastegate will open well before boost becomes sufficient to damage the engine. The boost control doesn't care (or know) that the engine is revving against the torque converter, it will still bleed boost once design boost is exceeded. The real danger is overheating the transmission.

ZV
 
Originally posted by: PorBleemo
Thanks for the fast responses!

One more question, I read that the stall RPM for these cars is at about 2900RPM. Is that the optimal time to release the brake or is it irrelevant?
Click to expand...

Yes...but get a higher stall convertor
 
Originally posted by: Zenmervolt
Originally posted by: spidey07
SuperSix is indeed correct on how to launch on his very nice car that I'm sure he is very familiar with, with a motor/turbo built to run. I love the grand nationals.

The 850 is not such a car.

Try it with your 850. Just make sure you have a cell phone handy when you pop a hose. They are not the same animal. Too much gas on the 850 and POP! No more turbo. At least on mine way back when it was a new car.

You're not really hurting anything, just too much pressure.
Click to expand...
Spidey, unless the boost controller is malfunctioning, the wastegate will open well before boost becomes sufficient to damage the engine. The boost control doesn't care (or know) that the engine is revving against the torque converter, it will still bleed boost once design boost is exceeded. The real danger is overheating the transmission.

ZV
Click to expand...

I understand. But i popped many a hose with my 850 turbo when I tried.

Like I said, its first hand experience and maybe something was wrong. From what I 'heard' (meaning heard from the turbo/motor), it didn't waste or bleed. There were many complaints on the 850 from what I remember but I still loved that car.

There was no damage to the motor/turbo. Just blown hoses.
 
Originally posted by: spidey07
I understand. But i popped many a hose with my 850 turbo when I tried.

Like I said, its first hand experience and maybe something was wrong. From what I 'heard' (meaning heard from the turbo/motor), it didn't waste or bleed. There were many complaints on the 850 from what I remember but I still loved that car.

There was no damage to the motor/turbo. Just blown hoses.
Click to expand...
Either overboosting or loose hoses then. I've done the same with the 951. Blew the intake boot off the AFM at 15PSI above atmospheric. I use a bigger clamp now. 😛

ZV
 
boost is boost. It doesn't care if the car is moving or not. The only difference is there won't be air moving across the intercooler so it will heatsoak fairly quick. If you plan to take it to the strip often I would upgrade the tranny cooler.
 
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