Real world TPI hp gains

[Jim Pearl]

One of the reasons why this is\was done on Late Model Mustangs was to 
richen the mixture. As was stated below going too cold would never allow 
the computer to get out of warm-up mode and didn't help much. Other than 
simply trying to richen the mixture I've not heard of any other benefit 
except possibly cooler intake temps (ha!). All in all on the Mustang at 
least it's not worth much and is a Band-Aid...

----------
>From: 	John T Stein[SMTP:JSTEIN at dpc2.hdos.hac.com]
Sent: 	Monday, February 26, 1996 5:33 AM
To: 	diy_efi at coulomb.eng.ohio-state.edu
Subject: 	Re: Real world TPI hp gains

> Date:          Wed, 21 Feb 1996 07:39:47 -0800
> From:          jzalesny at ix.netcom.com (JimZ -92' AWD Tsi )
> Subject:       Re: Real world TPI hp gains
> To:            diy_efi at coulomb.eng.ohio-state.edu
> Reply-to:      diy_efi at coulomb.eng.ohio-state.edu

> You wrote:
> >
> >Decreasing inlet air temp(and intake manifold temp) will increase 
horsepower
> >with no other changes, assuming the ECM is allowed to adjust 
accordingly.
> >Has any one dyno tested a '89 350 TPI engine and then changed only the
> >thermostat (195 to 150) and removed the hot coolant going to the 
throttle
> >body to see the net 'real world' torque increase?
> >GMD
>
> On a a large number of EFI vehicles (if equipped)the ECU will never 
switch over
> to closed loop mode due to the low coolant temp.  The bypassing of the 
throttle
> body will work and give more power.
>
> JimZ
>
Jim (or anyone else for that matter),

Has anyone done any QUANTITATIVE testing of this effect??  I've been
hearing of the benefits of going to a colder thermostat, or NO
thermostat for that matter, since the '60s -- but nobody has ever mentioned
controlled testing.  Does one see gains of 10% HP, 1%,  1e-6 ???

John




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