[mkiv] Lost substantial amount of power

[Jake]

Alright, I think I found the cause for power loss on my Supra.
As someone already suggested, its the ambient temperature, how wierd it may 
sound.
I was normally driving at 77 to 86F when I had low power, but yesterday I 
drove at about 42-50F. The difference was HUGE. The car pulled like mad 
again, so that I actually got a little scared at times, since I wasnt used 
to so much power anymore. I would guess it was at least 30-40 HP more than 
before.
Ive had my car for 8 years now, and also noticed power loss on very hot 
weater before, but it was never this bad.

Now, I changed my stock intercooler just before I got that power loss, 
because my old one was completely clogged up with insects, dirt, etc. I 
bought a used one, which still looked very good. So actually I should have 
much less problems with high intake temperature.
But why is it worse now? :(

Is it really normal to lose so much power to ambient temperature? What can I 
do to counter it?
A FMIC would be the last option for me, since I would have to get a custom 
one done due to the european active spoiler taking up space.

Thanks

Jake
94TT 6SPD

----- Original Message ----- 
From: "George Datuashvili" <gdatuashvili at gmail.com>
To: "The MKIV.com National Mailing List" <mkiv at mkiv.com>
Sent: Saturday, 15 September, 2007 21:16
Subject: Re: [mkiv] Lost substantial amount of power


> I don't think it's old cat.
> When was the lat time you changed the fuel filter?
>
> Some more ideas:
> - spark plugs
> - coil packs
> - bad fuel pump
> - bad fuel (try different gas station & brand)
> - boost leak (where exactly is your sensor mounted that shows 1.1bar?)
> - conspiracy theory (porschas you raced have more power than owners
> disclosed)
>
>
>
> On 9/15/07, Jake <JakeGrafton at gmx.de> wrote:
>>
>> Hi guys,
>> it looks like my Supra has lost quite some power recently. I didnt really
>> notice it until I was only dead-even with several 325 HP Porsches. I 
>> should
>> have owned them bad.
>> Now, the turbos are boosting fine, the engine runs smooth, is not even
>> burning much oil and everything else seems to be in order. I am running
>> 1.1 bar with the stock cats installed right now. But I was able to beat
>> Porsches like that before with this setup.
>> So what could be the problem? I heard it could be either caused by a 
>> dirty
>> fuel filter, a bad MAF or a defective cat. Is that true?
>> All 3 possibilities could very well be the cause. In the last few weeks I
>> have been running my car very, very often with low fuel. That could mean 
>> a
>> dirty fuel filter, IIRC.
>>
>> I have also used a Blitz SUS air filter, which wasnt cleaning the air 
>> very
>> good (there was slight dirt inside the intake pipes, so the MAF could be
>> faulty from all this dirt.
>>
>> And last but not least my cat is very old. It has seen lots of use and
>> high EGTs so it could also be that its defective, also because my EGCV
>> failed a few months ago (it got replaced a few weeks before I noticed the
>> loss in power).
>>
>> The question now is, how do I test the MAF for normal function? Where is
>> the fuel filter located and how do I see if its dirty or not?
>>
>> Anyone know any other possible causes that could steal me like 30-60 HP?
>>
>> Thanks a lot in advance!
>>
>> Jake
>> 94TT
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