[mkiv] Lost substantial amount of power

[John Cribb]

Jake, if you're sure it's only the ambient temperature change that was
responsible for the power increase, then you might want to consider a M/W
injection kit to keep your intake air temps down.

Other things that could have affected the power are retarded timing due to
low octane fuel or overheating - perhaps with your other work you've reset
the ECU and it's starting over again with fresh learned settings?

But it's true, our motors definitely like the cool weather better than the
hot.

John
'97 APU
'94 BPU

-----Original Message-----
From: mkiv-bounces at mkiv.com [mailto:mkiv-bounces at mkiv.com] On Behalf Of Jake
Sent: Monday, October 22, 2007 5:38 AM
To: The MKIV.com National Mailing List
Subject: Re: [mkiv] Lost substantial amount of power


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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>> Mkiv at mkiv.com
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>>
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