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Location:
London
Registered:
January 2004
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 Supra TT MK4 turbo problem - help!
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Mon, 12 January 2004 10:55
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I am from the UK and have a '93 (MK4) Supra turbo auto Japanese import.
I *think* I may have a problem, but would really appreciate some input because I haven't had the car that long.
The problem is: sometimes when I kickdown from 3rd to 2nd (and
occasionally from 2nd to 1st) the second turbo won't kick in until the next gear shift (e.g. going from 3 - 2, the 2nd turbo doesn't open up 'til the box shifts me back into 3rd after going all the way to the redline in 2nd).
This only seems to happen when I kick down and the revs are above the 4000 where the 2nd turbo opens. If I kickdown and the resultant revs are, say, 3500, the turbo will open up fine at 4000.
Other than this, the car runs absolutely fine.
Any help would be great, there aren't many mechanics around who
genuinely know what they are talking about - as I am sure Supra owners out there will appreciate!
Nick
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Location:
Brisbane
Registered:
May 2002
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Re: Supra TT MK4 turbo problem - help!
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Mon, 12 January 2004 11:25
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Yeah, mine used to do this occasionally before I did the TTC mod. The sequential system seems to get confused sometimes, especially if you've upped the boost and/or installed a big exhaust. Basically live with it or go TTC!
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Location:
London
Registered:
January 2004
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 Re: Supra TT MK4 turbo problem - help!
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Mon, 12 January 2004 11:39
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Trouble is that it happens almost every time I use kickdown! I'm sure it can't be right 
I have seen a couple of posts before which suggest the tranny is slipping - resulting in not enough engine load for the turbo to kick in, but it just doesn't feel like it is slipping.
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Location:
Sydney
Registered:
March 2003
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Re: Supra TT MK4 turbo problem - help!
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Tue, 13 January 2004 04:13
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| nicopolous wrote on Mon, 12 January 2004 22:39 |
Trouble is that it happens almost every time I use kickdown! I'm sure it can't be right
I have seen a couple of posts before which suggest the tranny is slipping - resulting in not enough engine load for the turbo to kick in, but it just doesn't feel like it is slipping.
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Check all the vacuum lines going to the sequential control valves, there are 4 of the things from memory, plus the reservoir tank under the intake manifold, infront of the starter motor - if this is leaking it will cause problems with the sequential system.
If it's doing it everytime then there is something going on - the stock system can be fooled but for it happen everytime there is something more going on.
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