ptc92rs

I've gathered the info, parts and equipment. Now all I need is a good starting point to minimize the pain. I have seen discussion that the spark curves between auto and manual vehicles are quite different. So ... Just to get me in the right ball park so that I am not swinging a baseball bat at volleyballs, can someone please help me determine a good .bin to use as a starting point for my setup? My current prom (ID#571) is for a 92 or 93 Z28 350tpi Auto. I have a 92 rs 350tpi Man. 1) Was this a production setup? if so 2) Would it be worth a few years to my life to find this .bin and use it as a starting point? if so 3) Does anyone have / is willing to, donate this .bin to an aprehensive first timer? Wish me LUCK!!!!!!

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'92 RS LT1350 Big Mouth TPI 5spd 2.73 lmtd slp Daily Driver with "ISSUES"

leirch

Start with a 92 305tpi 5speed chip with the same gear ratio. I'm at work and can't look up the broadcast number right now.. So a search I think I actually asked for that a while back.

Grim Reaper

I am a bit confused about your signature "92 LT1350 TPI"???

Do you mean an LT1 Gen II block with a TPI? Also, there were no stock 350 TPIs with a 5 speed.

What ECM are you running? You should read your Memcal to see what's inside the BIN. I have a funny feeling it may be a 305 Memcal.

Momar

I believe that there may have been a few 350 tpis with 5 speed. This combination being very minimal. It was very rare. It required radio delete, ac delete, and maybe some other stuff. This is just what I have read. I am not sure what years these were produced but I think that they also had a special swinging fuel pickup and some other special stuff. I am not totaly sure that these existed and I doubt you have one and dont know it. Just something I read about. Does your sticker on the underside of the hood say it is a 305 or 350. This could at least tell you if it was the engine or transmission that was swapped. Hope this helped.

Benjamin A. Brohez

Momar

Hold on. Your car is an RS right. I think that the ones I read about were IROCS but I dont really know. Also did the RS have to have the B4C option to have the 350 tpi?

Hunter Motorsports

Oh PLEASE don't start with more wives tales about factory 350-5-speed ThirdGens.

We have been down that road too many times on this site. Trust me - do a search if you must.

As far as the PROM issue goes - did your car start life as an RS ? Is the computer from the RS ? What ECM do you have, and what is the 4-letter code on the PROM?

Until we get this information it will be impossible to offer any helpfull advice. PROM I.D. from a scan is not very helpfull. You need the ECM service number and the 4-letter code off the PROM itself.

More details about the engine also. Exactly what is it? What heads? What cam? What compression ratio? What intake? Small differences in any one of these areas can mean big changes fir an S.D. car.
Details - please.

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Karl Hunter
Hunter Motorsports
Vancouver, B.C. CANADA

ptc92rs

Maybe I should start from the beginning. This car is definately Frankinstien himself. It started life as a 305TBI (92RS). The original moron put this Big Mouth 350TPI system on the 305 and tried to splice into the original wireing harness (car only had 15k original miles). Confused, he sold it(gave it away). The next owner had his hands full. He replaced the entire wireing harness with a new GM 92 Z28 350TPI harness, then installed a 305TPI chip. Of course other small things like the gas tank (to change the fuel pump) also had to be changed. At this point the car would run but not verry good. Then I bought(very cheap)the car with 40k miles. By 60k the engine was shot. Excessive fuel washed the cylinder walls, ruined the rings, kept the oil diluted, and essentially wore everything out. At this point it seemed the cheapest thing to do was to swap the block to a 350(as apposed to reworking the 305 block AND trying to configure the TPI to work properly with a 305). So I found an LT1 with 5k miles(Stock 350 roller eng. from a 93 Buick Roadmaster including heads,10:1 CR), put my intake on it, and bought a GM chip for a 92? or 93? Z28 350TPI auto, I can't remember wich. It runs "OK" and gets 23-29 MPG(HONESTLY). But I still have many drivability problems, and it has definite power loss at different RPM/Speed/Load areas(I'm guessing this is due partly to the chip being for an auto and the car having a 5spd). You can accelerate at a steady TPS and you can feel the power coming and going. I also have spark or fuel knock in various areas(I think its lean). Runs VERY good in open loop then craps out in closed loop or as engine gets hot, not sure wich one. So basically I bought all this tuning equipment determined to make this car run right if it's the last thing I do(and might be). One of the things I need is a starting point .bin that is relatively close to avoid a first-timer anurism. I did a 30min. data record the other day on the way to work and the Int./Blm. is all over the place. I'm sure PE is different for auto vs. man and this may be partly why. If I've left out any needed info, just ask.
Thanks for any time and help.

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'92 RS LT1350 Big Mouth TPI 5spd 2.73 lmtd slp Daily Driver with "ISSUES"

[This message has been edited by ptc92rs (edited October 10, 2001).]

leirch

Are you sure thats an LT1?
As far as I know, you couldn't fit the stock tpi intake on an LT1 block due to reverse flow and the intake bolt pattern being different.
It sounds as if its a SBC gen 1 block with the tpi setup on it. What size injectors do you have??

I'm assuming its a 730ecm, I would start by having an extra memcal to erase and rewrite on to test new bins. Then start with a 92 305 5spd bin, you can find one at diy-efi.org on the gmecm ftp server. Once you get the 92 305 5spd bin you should be able to change the injector size, and cubes for the 350 motor. I tried the use a 350auto chip on a manual.. Its just so much easer tuning the fuel/spark tables(which you have to do anyways) rather than trying to get a 350auto chip to actual like a manual tranny was behind it and still having to tune the fuel/spark tables.


Brendan

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1987 IROC-Z L98,SR,EB 6085's,LPE 219/219 Cam, Crane 1.6RR, EB TPI Base, 58mm TB, Stock T5, 30lb SVO, AFPR, K&N, EB TES, Catco Cat, 3" Borla Cat-Back, Accel cap,rotor,distro/other crap, Aluminum DS, 94 Disk Rear, Adjustable Prop Valve, Precision 3.73 Gears, Weld in Sub-Frame Connectors, Hotchkis LCA's, KYB Shocks/Struts, Poly Bushings all over the place, Moog Upper/Lower Ball joints and Tie Rods ends/Idler Arm, Big stereo, 730SD Conversion.

To see the ROC, Check out the webpage Here

ptc92rs

It is very possible that you are right about the block. This is my first GM, I have previously been a dedicated ford guy, I was told it was an LT1 so I assumed it was. Clears that up. I have extra memcals both 27c256 and at29c256. The ECM says it's OEM and: number 7-7730 calibration code 0398mc . I also looked at the memcal and here's the number: AUJP16151348 How would I determine the size of the injectors?

Hunter Motorsports

Definately NOT an LT1.
LT1 (look alike) engines started in the Caprice/Roadmaster in 1994. So the engine you have would have started life as a TBI engine, and it may not even be a 350. To be sure, you need to check the casting on the block on the back of the block right behind the drivers side cylinder head. It will say 5.0LG for a 305 or 5.7LG for a 350.

The PROM you have is for a 1992 350 auto Camaro. If the engine is basically stock, and if it is a 350, and if there are no other underlying problems, then the car should run pretty good under most conditions. The problem is that you do not know what is really there for components: injectors, knock sensor, etc. In order to even begin a meeningfull tuning procedure for this car you have to be sure you have all the right pieces. Which knock sensor is in the block? What size are the injectors? is the engine REALLY a 350? And I gaurantee that if it was out of a Roadmaster it will NOT have 10:1 compression. It will very likely have vane port heads and be like 8.5:1 What you need to do is get ALL the facts straight. If you dont know what injectors are in there, then check the part number on them, or at the worst buy a new set. If you dont know what knock sensor is there then just put a new one in. Change the oxygen sensor too, as it is important to have a properly functioning O2 sensor for accurate PROM tuning.

Having a "frankenstein" car like this can be a real nightmare at the best of times. This may be a project that is a bit over a beginners head - no offense - but I have seen experianced "tuners" get confused at simpler projects. I am not saying that you cannot accomplish your goal of getting this car to run properly, but it is going to require alot of time and paitence.

Do some more fact finding on the car and let us know what you come up with.

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Karl Hunter
Hunter Motorsports
Vancouver, B.C. CANADA

N8MAN1068

it is very possible to put a tpi on an lt1, and an lt1 intake on a previously tpi block.

i have an lt1 tpi, and man it has some torque.....either way takes a bunch of work, patience, band aides, and beer.

Dyno Don

iTrader: (7)

The AUJP is a '92 "350" auto but it isn't the best to start with for a 5-sd, I know I tried it. Get a AXXD it is a '91 "305" 5sp and is a good starting place, then use your scanner and adjust accordingly. If you don't have access to that bin let me know and I will e-mail it to you. I did one for my "350" with an LT-1 cam but I don't have it anymore.
Don>>>

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Chronologically challenged. But still kicking!
'92 CAMARO RS
305 TBI 5/spd (now TPI)
B4C Alt.
Cam change:TRW 198/210 ,450/.460 114 LSA
Stock TBI manifolds
'85 IROC Ex.
14.94-92.00 mph
SPDC base and "350" Vortec coming soon!
'69 camaro-BB/Lenco,1050 dominators, /Pump Gas/no drugs 8.97-150+/3200lbs.
SoCal Thirdgen F-Bodies

Dyno Don

iTrader: (7)

The AUJP is a '92 "350" auto but it isn't the best to start with for a 5-sd, I know I tried it. Get a AXXD it is a '91 "305" 5sp and is a good starting place, then use your scanner and adjust accordingly. If you don't have access to that bin let me know and I will e-mail it to you. I did one for my "350" with an LT-1 cam but I don't have it anymore.
Don>>>

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Chronologically challenged. But still kicking!
'92 CAMARO RS
305 TBI 5/spd (now TPI)
B4C Alt.
Cam change:TRW 198/210 ,450/.460 114 LSA
Stock TBI manifolds
'85 IROC Ex.
14.94-92.00 mph
SPDC base and "350" Vortec coming soon!
'69 camaro-BB/Lenco,1050 dominators, /Pump Gas/no drugs 8.97-150+/3200lbs.
SoCal Thirdgen F-Bodies