Toyspeed.org.nz Message Board

by **rwd_mayhem** » Mon Mar 14, 2005 9:15 pm

in a 1990 celica sr, when im in neutral and tap the brakes repeatidly fast the revs go up - do u know why? does your car do it? go try it now!

im just curious - it doesnt really matter.

Carina AA63 · by **kingcorolla** » Mon Mar 14, 2005 9:41 pm

yea normal.

just the brake booster relieving vaccum in the manifold, put bluntly.

by **rwd_mayhem** » Tue Mar 15, 2005 8:18 pm

then why dont some cars do it?

by **Dr-X** » Tue Mar 15, 2005 9:36 pm

In some cases, the booster doesnt create enough vacuum to be noticable, or the ECU is quickly able to compensate accurately for it. You'll find on some cars the revs go up, on the revs go down, and on some they dont move, depending on how well the ECU reacts, if at all. It also depends on how much vacuum you're creating - perhaps some boosters dont create as much vacuum as others??

by **rwd_mayhem** » Tue Mar 15, 2005 9:50 pm

what about old cars that dont have an ecu - my te71 the revs go up, but in a 3k ke30 it doesnt do anything.

by **Spannergal** » Wed Mar 16, 2005 12:26 pm

Dr-X wrote:In some cases, the booster doesnt create enough vacuum to be noticable, or the ECU is quickly able to compensate accurately for it. You'll find on some cars the revs go up, on the revs go down, and on some they dont move, depending on how well the ECU reacts, if at all. It also depends on how much vacuum you're creating - perhaps some boosters dont create as much vacuum as others??

could you reread what Dr-X had to say as I'm fairly confident its in what he said

by **Lloyd** » Wed Mar 16, 2005 6:57 pm

And does the KE30 actually have a brake booster?

Details of car here · by **AE85coupe** » Wed Mar 16, 2005 9:41 pm

haha they do but its dam small and crap

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