About how much would a new ECM cost from a parts shop?How hard are they to install? And also if I was to buy a performance chip for my car,where does the chip go? I know silly questions...but I wont learn if I dont ask...thanks

 

What's your car? They used different ECMs over the years and for different types of induction systems.

For some ECMs, you can use a "cross-reference" list to get the same ECM but from a commonly available car. Getting a 7730 ECM for an L98 F-body is more expensive at a wrecking yard than a 7730 ECM from an early 90s 3.1 V6 Cavalier....even though they are the same ECM.

 

the car i have is an 88 camaro with a 305 TBI but im putting in a 90' TPI 350.

 

Ok i found a price for the 90' 350 ECM..its only $65....i still dont know if i need it or not...no point in spending money that i dont need to spend....Ive got mixed replies..some say yes...some say no....If I am putting a 1990 350 in where an 88 305 TBI use to be...do i need to change the ECM???????PLEASE...someone who positively knows the answer..let me know.thanks

 

Yes, change the ecm. Just make sure you get the right one. Make sure you get one from a 90-92 TPI 350 car (speed density). It will make things easier on you.

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L98, 3.27 9-bolt, Hooker shorty headers, custom 2.5inch Y-pipe, no cat, 3inch 2chamber flowmaster, JET AFPR, Ported MAF, Best ET: 13.86 @100mph. 1.99 60'
17 inch ROH "ZS" wheels. 17x8.5(front) and 17x9.5 (rear). Firestone Firehawk SZ50s. 245/45/zr17s and 275/40/zr17s. T56

On the way... Radar Blue 89 Formula, T56, Ram Jet 430, Ram Air, 17inch ROHs.

 

Maybe I am not reading your post right but if you are asking if you need to switch from a TBI to a TPI ecm for the swap the answer is yes the TBI ecm will not run the TPI

 

What the other's said...TPI uses a completely different ECM from TBI. And SD TPI is different than MAF TPI.