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Old 08-03-2005, 11:54 PM   #16
Wally
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Quote:
Originally Posted by Oomba
Oh god...fighting urge..to...criticize...aaaah

Critisism is fine, antagonism/sniping is another thing again.
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Old 08-04-2005, 01:20 AM   #17
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Question: Do automatic cars need a blow off valve? I mean when they swithch gears, you keep your foot on the pedal so the throttle is always open. Is it only used when you are accelerating and then let your foot off fast in an auto?
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Old 08-04-2005, 01:38 AM   #18
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I always thought that there would be no gush in an auto as well....until I drove an automatic turbo eclipse...For some reason it gushed when it shifted even though I wasn't letting my foot off the gas...
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Old 08-04-2005, 02:26 AM   #19
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Well if you're going fast and take ur foot off the pedal it will down-rev, making it blow.
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Old 08-04-2005, 02:32 AM   #20
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yes...But I didn't remove my foot from the gas.
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Old 08-04-2005, 02:36 AM   #21
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Quote:
Originally Posted by Zalight
yes...But I didn't remove my foot from the gas.

It still takes time for gears to engage in an auto
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Old 08-04-2005, 07:02 AM   #22
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A couple of car questions

As far as cosmetic improvements (which means looks as opposed to peformance improvements) usually, what people do first is : Wheels and tires, body kits (flared fenders, spoilers, etc), graphics (paint or vinyl), then interior upgrades such as seats, guages, carbon fiber trim pieces, etc. An exhaust system could be considered both cosmetic and performance, because they'll usually put on one of the big'ol "coffee can" mufflers. Get yourself a copy of Import Tuner or Sport Compact Car magazine, and you'll get a bunch of ideas.
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Old 08-04-2005, 12:47 PM   #23
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Quote:
Originally Posted by Zalight
I always thought that there would be no gush in an auto as well....until I drove an automatic turbo eclipse...For some reason it gushed when it shifted even though I wasn't letting my foot off the gas...
In stock form, most automatics are considered luxury items, and so are tuned for smooth shifts, not fast ones. Thus it gently went to the next gear, instead of with no lag. Had the trans been tuned differently, you would have felt a consistent surge of power even during the shift.
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Old 08-04-2005, 12:58 PM   #24
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Quote:
Originally Posted by ChrisV
In stock form, most automatics are considered luxury items, and so are tuned for smooth shifts, not fast ones. Thus it gently went to the next gear, instead of with no lag. Had the trans been tuned differently, you would have felt a consistent surge of power even during the shift.

Hey chris which cars (if any) come with "preformance autos"?
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Old 08-04-2005, 01:35 PM   #25
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Old 08-04-2005, 01:46 PM   #26
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Very few in stock form. Many musclecars had them (for example if you boughta Ford musclecar with te Dragpak in the '60s, the automatic would be tuned firmer. Chrysler did the same with the 727 TorqFlite, as did GM with a number of cars equipped with the TH400). A few more modern cars had automatics that had a "sport mode" that changed the shift pattern, held the trans in gear longer, and changed the internal presures for firmer shifts and les slippage between gears. But none of them are really at the level of the typical aftermarket shift kit, like provided by B&M, TCI, Art Carr, and the like.

The B&M shift kit I put in my perforamnce cars wioth automatics would allow them to shift firmly, but smooth under part throttle, but at full throttle would shift so fast that the cars would bark the tires going into each gear, including overdrive.
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Old 08-11-2005, 10:36 PM   #27
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Chris, But do you know why even automatics need blow off valves when shifting?
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Old 08-11-2005, 10:56 PM   #28
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Quote:
Originally Posted by CarEXPERT
Chris, But do you know why even automatics need blow off valves when shifting?


Because when you go the next gear up, the revs drop. And, you still need a blow off valve or equivalent for if you let off the throttle at any other time, just like a manual.

The difference in the automatic is even though the revs drop into the next gear, the turbo doesn't stop spooling like it does when you let off the gas during a shift with a manual car (even though it bleeds off the excess boost through the BOV)
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Old 08-11-2005, 10:57 PM   #29
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BOVs aren't mandatory.
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Old 08-11-2005, 10:57 PM   #30
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first of i didnt know blow off valves were needed. correct me if im wrong but i thought bov where used to release excess pressure in the turbo in between gears. and if that is basicly correct it doesnt matter if its you switching gears or an automatic transmission doint it its the same thing just a deferent person doing it in a sense. and bovs arent needed. how many turbo cars come stock with bov's, and im not talking expensive concepts
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