Hello/Beat that dead horse again! clarification

[Mike Rolica]

Mike Rolica
EXT. 260
 :-)


	-----Original Message-----
	From:	BluVette [SMTP:bluvette at scarcorvette.com]
	Sent:	Saturday, October 30, 1999 10:37 AM
	To:	gmecm at efi332.eng.ohio-state.edu
	Subject:	Re: Hello/Beat that dead horse again! clarification

	OK guys, let me reword the original message and clear up a few
points along
	the way.

	I designed and built and engine. I designed the cam. ACCORDING tot
he CAM
	GRINDER and HIS computer, that cam is good for 600-650 HP, with all
other
	factors taken into consideration such as heads and the rest of the
	modifications done. *I* limited the engine with 30# injectors, so if
there
	was any possibility of the stock computer, with a chip in it that
has
	already been modified for the supercharger.  I'm a mechanic, not an
	electronics engineer. Please, whenever possible, put your replies
into
	laymens terms, and that would help a bunch!  :o) Thanks.
	Now, back to my original problem. When the engine hits 5400 rpms, it
just
	stops. I was told on another list that the computer limits the rpm's
at 5400
	on a stock L-98 enine in 1989. BEFORE the modifications, with only
the
	supercharger, it did the same thing. I really need to spin this
engine up to
	at least 6000....so, does the computer limit the rpm's at 5400 
	Not true, I run 89 calb on 355 l98
	Are you running stock runners/ intake?  L98's do not make much power
after 54-5500.  They actual drop off like a stone.  What are the cam specs?
	Any thing more than a 219 @ 50.. you are wasting your money trust
me.  If you want to build a TPI, Build it to enhance it's existing better
characteristics. I.e.  Throttle response, low end torque.  Trying to better
it's pitfalls n you are wasting money and playing a loosing game.  If you
want power up top, well go to bigger intake tubes and intake as well as
bigger intake plenum,  or shorter runners.  But with this you loose the
throttle response and low end torque and end up getting something like an
LT1  Notice the LT! Make lotsof hp way up but Throttle response and low
torque sucks compared to l98.  And visually you can see, intake tract is a
lot shorter, tubes slightly bigger and volume of intake plenum bigger.  My
cam goes flat when Tpi intake setup dies off,
	I make 385hp @ 5500... 210 @ 6000  But I make over 400 ft-lbs at
2400 - 5000 with a peak of 460 at 3800.   And throttle snap that will make
you neck hurt.   Try a shorter duration cam with lots of lift.  Try to get
the valves to open as fast as possible.  I.e I run 265 adv dur  218@ 50 and
.520 lift.  
	I have done lots of testing research on tpi.   Can answer some of
your question and maybe point you in the right direction.  


	or is
	something else doing it?  It did it with the old stock injectors,
and i
	would have thought that the engine would lean out at a higher rpm
with the
	new 30# injectors.
	Next problem is the idle. It is hunting between 500-700 rpms. The
cam is on
	the radical side, along with custom made full roller 1.6:1 rockers.
I HAVE
	to raise the idle up to about 800-850 rpms, as it dies right now
when coming
	to a stop about 1/2 the time, especially when the engine has been
running at
	WOT, and then letting off the gas, it dies almost immedatly.
	I'ts your Maf... You just may have to live with it... Or go map

	I am sure that there are other factors to take into consideration
that I may
	not be aware of as of yet. The engine is also equiped with
water/alcohol
	injection, just ahead of the throttle body to help eliminate
detonation, and
	that combined with the lowered compression ratio has done a GREAT
job, and
	no knock or detonation is apparent, even under full boost
conditions, so I
	don't *think* that the advance curves need to be played with any
more than
	they may have already been altered by the custom chip that is
already in
	place.

	Someone on the list suggested swapping out the computer with one
from a
	turbo GM car. Good idea, but, just HOW would I go about this, and is
it
	compatable with an 89 Corvette onboard systems already in place?

	Inquiring minds want to know :o)

	Thanks to everyon that has been involved in this thread to this
point,
	pleasae be patient and I will get up to speed.   TIA!
	-Barrett
	SCAR Corvette & Performance
	1010 W. Hwy 131, Clarksville, IN  47129
	(812) 941-0839
	bluvette at scarcorvette.com
	www.scarcorvette.com