i have a 93 z28 it has long tubes 3" ory pipe bullet muffler k&n cold air intake and a elbow want to up it to 24 pound injectors and 1.6 roller rockers but i was told i probly need a tune but my car is obd 1 and only takes a chip i live in central miss and knlw noone that does this sort of thing .............. and what exactly is these free mods i here about i am new to the car world always had trucks thanks for any help

 

well youn dont have any need for bigger injectors but if you do get them you will need to tune the car.

you should really get one anyways with your lt's and ory.

 

You can have your PCM sent out for a mail order tune. PCMforless, MadZ28, etc. They all do that. You tell them what you would like to accomplish and what you need and they will flash your PCM and mail it back. As for the free mods here is a site that outlines the general ones http://www.lt1howto.com/articles/lt1freemods.htm

 

thanks for the advice but i was told you couldnt send off the pcm of the 93 electric system was told id have to have a chip burnt i wish there was somebody i could call and talk to about it

 

For a 93 tune they use a chip and carrier that is plugged inbetween the stock chip and ECM. This chip contains the new programing, in effect overriding the stock chip.

So when you request a tune the tuner will initailly send you the chip with the new tune+carrier. you open you ECM, remove you stock chip and install it on the carrier (that also contains the new program chip), then plug that assembly into your ECM and this is how the stock tune is modified. If you require the tune to be adjusted/changed you send the chip back and the tuner will reprogram it. You don't actually send then you computer like with a 94+ ECM.

 

^^^^well that prity much sums it up right there. Just send fill out the sheet w/ your mods and pay and you should be good to go. I've had best luck w/ Pcmforless mail order tune. 24lb injectors are not needed for a bolt on car, if anything get yourself a new 255lb fuel pump.