Real world TPI hp gains

[Jim Pearl]

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I'm not sure that removing the coolant line from the intake would buy =
you anything. On the Fords (of which I'm more familiar) this was a =
popular thing to do awhile back. However it was quickly realized that =
the "hot" water was being used to cool a hotter area of the intake - the =
EGR. I don't know about the Chevies as much as the Fords but it seems to =
me that the factory wouldn't heat the intake - that they'd be using =
something like that to cool the intake. Do you have EGR - now there's a =
potential source of heat!

As for running too cold - tolerances change with temp. A cold engine =
doesn't atomize the fuel as well (I'm told) and who knows what other =
reasons. Since what you really want is cool intake temps why not make =
sure the air doesn't stay in the intake long enough to heat up? At WOT =
on a decent day and with my intercooler my air temp going into the motor =
has been darn close to ambient, I can't get any better than that and =
this was with 8-10lbs of boost! I do need to get a really accurate gauge =
though - I'm not sure I believe the DFI datalog...

----------
>From: 	George M. Dailey[SMTP:gmd at tecinfo.com]
Sent: 	Tuesday, February 20, 1996 7:19 PM
To: 	diy_efi at coulomb.eng.ohio-state.edu
Cc: 	IMD1 at msn.com
Subject: 	Real world TPI hp gains

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?  What do you guys =
think
about an electronic controlled thermostat on FI cars?  Dial it low for =
fun
in the sun power.  Dial it high when Jack frost is biting your head off. =
=20

It's my understanding that, too low of an engine temp is bad for the =
engine
(long term).
Higher engine temps give better fuel economy and other desirable
characteristics for every day driving.  An electronic controlled =
thermostat
could allow street roders to have the cake and eat it too... if the gain =
is
substantial enough.=20

GMD




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