fuel setup/tuning q's

[theycallmedalgo]

sorry for posting twice but i have 2 seperate issues i need help on.

Currently i am running a walboro 255 with a corvette maf or mas i forget which it is, but its a rough tune and i believe the car is running rich.

im getting a logger this week and want to have an efficiently running automobile that is somewhat good on gas.

what im thinking for a solution is to get an afpr, along with safc for tuning. Would i need anything else besides the afpr, and safc to tune my car?

i have heard that i will need an eprom ecu to hook up the safc, is this true? does my car have an eprom ecu?

i searched on this many times but have not encountered what im looking for, if someone could point me in the right direction with this issue i have that would be great.

 

[awdtalontsi1992]

Lets start with the first reason why the car is running rich. The 255 pump you have is overrunning the stock FPR. I would get an AFPR to fix that first problem.

After that you should be able to use the MAFT to get a good rough tune. The logger will be a help in your tuning. I would recommend you get a Wideband O2 to help with this also.

Now....if you get the SAFC you don't need a chip to use it. It will hook into the wiring and adjust your fuel using the stock computer. If however you go with injectors bigger than 650cc than a chip is a good idea to keep the SAFC from screwing up the ignition timing. Anything 650cc or below you don't need a chip for. Good luck.

 

[Midnight DSM]

To know if your ECU is EPROM you will have to check inside your ECU to know for sure whether or not it is eprom. On the outside of your ecu there is a code that will look like one of the codes below. You are not guaranteed to have an EPROM ECU with these codes but it is more likely.




MD128623 MD128625 MD145902* MD145903* MD165529*
MD165530 MD165531* MD165532* MD166260* MD166261
MD166262* MD166263* MD193293 MD193294 MD193295
MD193296* MD193297* MD193298* MD193299* MD193300*
MD304482* MD304483 MD304484* MD304485

*Possibly, but not guaranteed to be an EPROM model.

 

[want_a_gsx]

http://www.tmo.com/howto/ecu1g/checkeprom.htm

scroll down to the bottom of the page and look at the picture. when you open up your ECU compare the pics with it. if it has the little black chip circled in red (in that link) then its eprom.

 

[theycallmedalgo]

thanks for the replies

how would i be able to tune with the maft? i dont really understand how i could tune with just that and a logger. also, ive heard that a wideband o2 is a huge waste of money, but im not sure

what would be the best/cheapest route in order to tune my car? i wont be going with bigger injectors or trying to make more power.

on another note, is running a smic wiht my current setup really bad? im thinking about getting a fmic and then painting it black in order to avoid unwanted attention.

sorry for the length i appreciate all the help

EDIT: also, the previous owner told me the timing is at 8:2 as oppose to 9:1..not sure if that matters just putting it out there

 

[Gromit]

thanks for the replies

how would i be able to tune with the maft? i dont really understand how i could tune with just that and a logger. also, ive heard that a wideband o2 is a huge waste of money, but im not sure

what would be the best/cheapest route in order to tune my car? i wont be going with bigger injectors or trying to make more power.

on another note, is running a smic wiht my current setup really bad? im thinking about getting a fmic and then painting it black in order to avoid unwanted attention.

sorry for the length i appreciate all the help

EDIT: also, the previous owner told me the timing is at 8:2 as oppose to 9:1..not sure if that matters just putting it out there

There seems to be a lot of mixed up info here. First off, if you have a GM MAF & MAFT, go here to learn how to use & tune with it:

http://www.fullthrottletech.com/

A logger & the MAFT, as mentioned by awdtalontsi1992 will let you tune the car. A wideband O2 would also be a big plus - they are not a waste of money. You are probably thinking of the A/F gauges, commonly referred to as "Blinky Light Shows" - those are a complete waste of money. The wideband O2 will tell you what your A/F ratio is at all times - far more accurate & useful for tuning than using just the narrowband O2 sensor you already have on the car.

Second, you really need the AFPR with the 255 lph pump - without it your idle & low-throttle tune will be junk & it'll be almost impossible to dial in your fuel trims.

Third, if you're running a Big 16G, upgraded pump, & upgraded MAF, you're going to working your stock injectors pretty hard if you want to use that turbo to its potential - you might want to consider 550's at a minimum. You can keep the stock 450's, but make sure you use a logger to check your duty cycles.

Fourth, but perhaps most importantly, if you just got this car make sure you do all the proper basic maintenance before bothering to try & tune. Boost leak test, plugs, wires, fluids, filters, belts etc. - check it all.

I wouldn't worry about the stock SMIC right now. Get everything else up to speed before you consider upgrading to an FMIC.

You do not need an EPROM ECU to use a SAFC. An EPROM ECU is only necessary if you want to run DSMLink or install a custom chip.

Lastly, the 8:2 ratio vs. 9:1 ratio the previous owner told you about is the compression, not the timing. You have non-stock pistons so you have a different compression ratio. Your base timing, which should be at 5* BTDC, should be checked with a timing light as part of your basic maintenance. Spend some time reading at this site to learn a lot about the terminology & factory specs:

http://members.shaw.ca/costall/1000Q/

Hope this gets you started on the right track.

 

[syclone]

I just want to reinnerate what was said above.
an o2 gauge (blinking light) will tell you if you are lean or rich and that is it, not much help.

however,,

a wide band o2 gauge is a great and wonderfull thing, one of the best tuning tools out there. it tells you in real time exactly how rich or lean you are running it will tell you your air/fuel mixture is 11 to 1 or 12.2 to 1 or 10.8 to 1 etc. the exact air fuel ratio
as it reads WIDE BAND.

I can't see tuning without one myself, I have the PLX devises R500 and love it.

Jamie Sanders

 

[theycallmedalgo]

wow thank you guys, your very helpful and informative. now i know where to start.

i know running a 255 without a fpr is bad and i will get a fpr as soon as possible.

thanks for clearing that up about the compression haha

i do believe i have a 2003 corvette (gm right?)MAF so that will eliminate the need for an safc correct?

i will gladly pick up a wideband 02 but they seem utterly expensive, like 300? if its worth it though ill have no problem picking it up.

also, i believe that the car has 550's in it but i will find out asap.

thanks again, im goign to do some research now

 

[syclone]

I am unsure with the MAF, I think you would still need an SAFC, I dont know much about the SAFC, I went the DSMlink/wideband route right from the start since I knew that to get the performance I wanted I would have to upgrade eventually anyway. better to buy the right parts the first time.
as for the wideband, if you plan on upgrading things more in the future, and having to retune the engine more than one or two times or want to get a near perfect tune for performance, I think it would be a wise investment.

 

[theycallmedalgo]

I am unsure with the MAF, I think you would still need an SAFC, I dont know much about the SAFC, I went the DSMlink/wideband route right from the start since I knew that to get the performance I wanted I would have to upgrade eventually anyway. better to buy the right parts the first time.
as for the wideband, if you plan on upgrading things more in the future, and having to retune the engine more than one or two times or want to get a near perfect tune for performance, I think it would be a wise investment.

if your from arkansas why are you in the tri state?

anywho, i think ill be good with the maf and wideband o2 if i do in fact posess the correct maf. or i might need the safc idk