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have a 87 monte carlo, has 92 TPI set up, ( i think)
using GM 1227730 ecu,
is a T56,
383, SBC, with Lingenfelter /Accel super ram.
runs and drives ok, but cruise. steady rpm, is not nice,
on the side of the ecu is marked, hand written C1432 JSB
looking for info on chip or should I do ostrich 2.0 ( which is foreign to me)
and while I'm seeking info, throttle is very stiff ( single cable) the only spring I see is on the TB,
is there a softer spring made? or way to mod this one?
THZ
most guys would just get a G1 and a chip, and a cheap programmer, the thing is it MUST have been already tuned or it would barely run at all, so you might want to open it up and see if that stuff is already in there. the chip itself may be marked which would be a good starting point. you might already have a flash chip so all you have to do is buy a programmerQuote:
looking for info on chip or should I do ostrich 2.0 ( which is foreign to me)
a typical cause of that is the timing advance being totally out to lunch in cruise range, which is a good reason to invest in an ostrich, as that kind of thing is certainly a tune-by-feel and trial and error thing, which for a first time tuner would be much easier to do by you sitting in the passenger seat with a laptop, and a friend driving in the problem range.Quote:
runs and drives ok, but cruise. steady rpm, is not nice
the way i usually correct timing errors in cruising range is identify the problem range (isolate to a particular RPM, MAP, TPS, temperature range, whatever), drop like 4-5 degrees of timing in the problem area to see if it gets better. if it gets worse, try going the other way and adding 4-5 degrees instead. then try a bit more until you notice no difference, stop and smooth out that part of the timing table a bit. this doesn't require an emulator, but does require opening your ecm and reprogramming the chip a half dozen times at least.
even with a fairly heavy spring, the throttle should be pretty soft. don't go and mess with the spring tension of the stock throttle body. your cable is probably sticky, or just badly routed. try disconnecting it from the throttle body and see if it's smooth or not. you should try wicking some oil down it or get a new cable. i like lokar cables for tpi, they're shiny and goodQuote:
and while I'm seeking info, throttle is very stiff ( single cable) the only spring I see is on the TB,
is there a softer spring made? or way to mod this one?
another thing with your throttle body is the throttle shaft gets pretty sticky, especially on antique aftermarket throttle bodies. you can just get some penetrating oil and spray it from the inside of the TB when it's warm, and open and close the plates a bit, it should get better.
thanks, I'll look at dirty TB 1st,
Attachment 16968
throttle cable seems straight shot,
not much straight about that. look at the angle it's pulling your throttle linkage at (would get worse as the throttle opens). i bet the friction is all where the inner cable exits the outer through that metal tip.
GM ECU 1227730 was used on several General Motors cars in the late 1980s and early 1990s, including the Chevrolet Corvette and Camaro. The chip used in this ECU is known as "memcal".
The specific memcal used in your ECU may vary depending on the specific application and modifications made to your car. Without more information, it is difficult to determine the exact catalog number of the memcal that is currently installed.
There are several aftermarket companies that make replacement memcals for the GM 1227730 ECU. These replacement memocals can offer improved performance and control over standard programming. Companies making replacement memos for GM 1227730:
Tuned Port Injection Specialties (TPIS)
Racetronix
Wester's Garage
Street & Performance
Moates.net.
To find the right chip for you, you'll need to consult with representatives from these companies. Good luck.
First, this thread is nearly two years old. Second, Moates went out of business. Third, the thing about checking the existing memcal was already covered by steveo in the very first reply.