Re: New Member here

["nacelp" <nacelp@bright.net>]

Try the archives here, and at DIY_EFI for Crossfire, 747, and Programming
101.  BTW my 84 Firebird with a similiar engine to yours runs mid 13's with
sway bars street tires leaving from idle, muffled etc.
Grumpy

> I spent about a week reading your archives and was impressed, not only at
> the wealth of knowledge but also that there seem to be plenty if not the
> majority of you that are TBI fans and gurus. I was psyched! Im running a
> combination that I thought was a little unusual till I saw what some of
you
> guys are doing. The car is an 89 Firebird (pic:
> http://www.geocities.com/pipeline/6249/crosslace.jpg  )
> the mods and specs are as follows:
> 305 .030 over (310 ci)
> 1 11/16 GM TBI unit with all the mods that I detailed in the
> www.thirdgen.org ultimate TBI articles
> Turbocity TBI to 4bbl manifold adapter
> Edelbrock Torker II single plane intake manifold
> '86 #416 305 H.O. Cyl heads, fully ported and exhausts polished, crane
> springs & retainers
> S.S.I. Flat tappet camshaft 214/224@.050   .444/.465  112 LSA
> Crane 1.6 ratio rockers elevate lift to .474/.498
> Milodon Crankshaft wiper
> Edelbrock TES full exhaust
> no cat
> no a.i.r. pump or a.i.r. equiptment
> no e.g.r.  (yes i get 32 but its just an annoyance)
> non drop base 14x3 open element with K&N
> accel coil (this one broke the camels back)
> stock 700r4 and stock torque converter
> and 2.73 posi (converter is being swapped for 2500 stall and gears will be
> 3.73 soon)
>
> Pic of the motor: www.geocities.com/pipeline/6249/DSC0001.jpg
>
> and drum roll please.... on the STOCK GM Lo3 chip! In the stock  #746 ecm
(i
> think)
> and it actually runs! Decently I might add.
>
> The base timing however needs to be somewhere north of 15 degrees or it
runs
> like total doodoo with random and frequent intake backfires, usually the
> result off idle rapid throttle opening.
> In addition it doesnt seem to rev to the rpm range one would think the
combo
> was good for. I was expecting 5700 rpms but it seems to kinda just go flat
> at 5000 which is something ive been  struggling with.
> Fuel pressure is at 14 psi, DMM o2 readings are about right on at WOT
except
> the faster I go the richer they are for some odd reason (faster as in
> vehicle speed not engine speed)
>
> I dont have a vacuum gauge but idle return voltage from the MAP is around
> 1.3. I suspect the conclusion the ECM is drawing is that low vacuum+low
> rpm=heavy load so the timing is retarded as a precautionary measure thats
> why i have to run so much base timing. I've tried a 100kohm potentiometer
on
> the map return line in an attempt to knock down the voltage some. The only
> difference I notice with it is when it is adjusted to any real measureable
> degree, it gives me a bad stumble/ off idle lean.  I dont know what the
car
> is doing at 3600 when im supposed to be at full advance. From what I
> understand this ecm doesnt show advance curves either.
>
> Im happy my single plane+Tbi experiment worked out as planned. Even with
the
> big cam, ported heads, and SINGLE PLANE intake manifold on a 305 with
stock
> converter and crap gears i can lay two stripes of 245/50 falken rubber for
> 20 feet or so..
> No vacuum signal to worry about, no soggy low end :)
>  Testing at the local street race spot with the quarter mile marked off
> shows me doing 97 mph crossing the line which i thought wasnt bad
> considering im stuck below 5000
>
> Obviously I want to make this combo work and am a diy kind of guy. So I've
> been doing a bit of research, the cheapest eprom burner I've found is the
> pb-10 at www.needhams.com  as for erasers I havent looked around that
much.
> I also like the software at www.tunercat.com, it seems to be very user
> friendly but you could probably do alot more with the freeware progs. on
> this site I imagine. It also looks like I'm going to have to upgrade to
the
> truck ecm.
> Any suggestions on equiptment or anything else would be great, and I'm
glad
> to be a part of your discussion group now.
>
> My goal is 13.7 in the quarter mile
>
> Best Regards,
> Pablo Morales
>
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