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Jun 28, 2006 6:25:23 PM

CF: Rennteam Moderator; Loc: Florida , United States; Posts: 1113, Gallery; Registered on: Mar 30, 2003; Reply to: Bending

Re: 500 miles Review

Quote:
(this is why rally cars have anti-lag systems to prevent the lost of boost during gear changes)

There's no loss of pressure when changing gears with the Tip gearbox since it preboosts between gearchanges.

This is not possible with the manual gearbox, hence the slower acceleration times.

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Jun 28, 2006 6:47:29 PM

eclou: Veteran; Loc: Texas , United States; Posts: 1182, Gallery; Registered on: Jun 4, 2006; Reply to: CF

Re: 500 miles Review

Quote:
CF said:

Quote:
(this is why rally cars have anti-lag systems to prevent the lost of boost during gear changes)

There's no loss of pressure when changing gears with the Tip gearbox since it preboosts between gearchanges.

This is not possible with the manual gearbox, hence the slower acceleration times.

This statement of yours makes no sense. When any turbo car under load undergoes a gear change, the recirculating valve (blow-off valve) dumps the pressurized intake charge back upstream of the turbo compressor to help build spool back up. It has nothing to do with the type of transmission.

The tip/autos on a turbo car have the advantage of a torque converter which will basically store energy the way a flywheel does during shift changes, and allow enough slip/stall to get the motor into the torque band more rapidly.

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Jun 28, 2006 6:49:01 PM

CF: Rennteam Moderator; Loc: Florida , United States; Posts: 1113, Gallery; Registered on: Mar 30, 2003; Reply to: eclou

Re: 500 miles Review

Read the Product Information Guide.

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Jun 28, 2006 6:50:16 PM

manu: Junior; Loc: spain; Posts: 56, Gallery; Registered on: Jan 7, 2005; Reply to: CF

Re: 500 miles Review

Quote:
CF said:

Quote:
(this is why rally cars have anti-lag systems to prevent the lost of boost during gear changes)

There's no loss of pressure when changing gears with the Tip gearbox since it preboosts between gearchanges.

This is not possible with the manual gearbox, hence the slower acceleration times.

This is not related to the gearbox, it's related to porsche profit.

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Jun 28, 2006 7:36:51 PM

trip: Expert; Loc: Bay Area California , United States; Posts: 1691, Gallery; Registered on: Jan 11, 2006; Reply to: CF

Re: 500 miles Review

Quote:
CF said:

Quote:
(this is why rally cars have anti-lag systems to prevent the lost of boost during gear changes)

There's no loss of pressure when changing gears with the Tip gearbox since it preboosts between gearchanges.

This is not possible with the manual gearbox, hence the slower acceleration times.

Couldn't the use of double clutching during upshifts "pre-boost" the turbos?

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Jun 28, 2006 8:15:45 PM

Grant: Rennteam VIP; Loc: Denver, CO , United States; Posts: 12588, Gallery; Registered on: Aug 21, 2002; Reply to: trip

Re: 500 miles Review

Quote:
trip said:Couldn't the use of double clutching during upshifts "pre-boost" the turbos?

No, because blipping the throttle in neutral (or with the clutch pressed while in gear) does not put the engine under any load, so there is virtually no exhaust flow...

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Jun 28, 2006 8:33:22 PM

trip: Expert; Loc: Bay Area California , United States; Posts: 1691, Gallery; Registered on: Jan 11, 2006; Reply to: Grant

Re: 500 miles Review

Really? In neutral no engine load? Huh, well thanks for clarifying.

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Jun 28, 2006 8:40:09 PM

Crash: Rennteam VIP; Loc: Never been to , Antarctica; Posts: 8287, Gallery; Registered on: Oct 17, 2002; Reply to: trip

Re: 500 miles Review

Quote:
trip said:
Really? In neutral no engine load? Huh, well thanks for clarifying.

Really. The engine doesn't need to move anything but its parts, so the load is negligible.

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Jun 28, 2006 8:48:14 PM

trip: Expert; Loc: Bay Area California , United States; Posts: 1691, Gallery; Registered on: Jan 11, 2006; Reply to: Crash

Re: 500 miles Review

So then how does the tiptronic preboost the engine between shifts if there is negligible load? Does it have to do with the torque converter?

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