tbi chip

[seniorbear69]

HI i have a complete 305 tbi set up engine,harnes ecu etc etc his is from an 88 firebird .if i wos to change the cam in this from the f body roller cam to the truck flat tapett cam will the chip need messing with ? the originalcam is from the 350 from the truck which is listed as a computer controled cam !

 

[Bextreme04]

I'm confused.. 88 Firebird would have been TPI, not TBI right? Are you trying to put a TPI 305 into a truck with a separate truck TBI system retrofitted onto it?

 

[yevgenievich]

88 firebird could be tbi or tpi. For TBI, staying with stock truck cam it should run fine if on 305 motor. For a 350, chip would need to be burned

 

[bucket]

I'd leave in the factory roller cam. 100%, no doubt about it.

 

[yevgenievich]

I am guessing it is 3rd gen fbody tbi to be installed on a truck motor. Injectors are different 305 vs 350 tbi and chip has to match.

 

[bucket]

I am guessing it is 3rd gen fbody tbi to be installed on a truck motor. Injectors are different 305 vs 350 tbi and chip has to match.

If the complete 305 goes in, along with the 305 injectors, the stock 350 chip will work and at least perform ok. I've done the opposite a couple times putting a 350 and injectors in place of a 305, but using the 305 chip. Apparently the fuel curves are similar.

 

[AuroraGirl]

If the complete 305 goes in, along with the 305 injectors, the stock 350 chip will work and at least perform ok. I've done the opposite a couple times putting a 350 and injectors in place of a 305, but using the 305 chip. Apparently the fuel curves are similar.

The year is a big deal to GM PROM chips in at least port injection. A 3800 from 88 and 90(both Ln3 v6) are completely incompatible in at least my situation. The biggest thing I’d ask is there any factory computer integration beyond the engine controls such as a digital display setup In the car. The engine PROM handles all stuff like driver information centers and stuff, and a a computer can go crazy if it doesn’t find the stuff it expects to find for some reason. I only mention this because it is a car. Beings it’s an f body, it might be ok, but just be mindful of some complete compatibility issues that don’t throw codes and also make it run like **** Just in case. I’m guessing v8 would be safe from it that year but you never know

 

[bucket]

The year is a big deal to GM PROM chips in at least port injection. A 3800 from 88 and 90(both Ln3 v6) are completely incompatible in at least my situation. The biggest thing I’d ask is there any factory computer integration beyond the engine controls such as a digital display setup In the car. The engine PROM handles all stuff like driver information centers and stuff, and a a computer can go crazy if it doesn’t find the stuff it expects to find for some reason. I only mention this because it is a car. Beings it’s an f body, it might be ok, but just be mindful of some complete compatibility issues that don’t throw codes and also make it run like **** Just in case. I’m guessing v8 would be safe from it that year but you never know

Right, but in a swap like this, the stock chip for the host vehicle is retained. With the injectors sized properly for the engine, you can get away with using the stock chip. A custom chip would still be a good idea, but it will work without it.

 

[seniorbear69]

thanks im going to fit the complete 305 pan to cleaner with the tbi ecu loom the whole shooting match and see how it goes .after sum reserch the original engine which is toast has a computer compatable cam which is in very good almost new condition with all the lifters.the original engine is a 350 which has been to the moon and back .which has been mesed with befor import to the uk whear she lives with me now.all the bores are oval ,3 difrent desine of piston .if u pore oiol ontop of piston it falls sraight out of the botom .that is how the 305 is in the truck . at moment runing the quadrajet and manifold from the 350 which is about as good as the block it came from .thats why the question about the cam . in the future thear will be an 700r4 joining it .if the original block can be rebuilt then it and the 700r4 and the tbi will live in the bay till then 305 tbi th400 is whot i have .thanks for yore help ,i shall give the 305 withe the roller cam it came with a go

 

[bucket]

Both cams are super duper mild. I bet if you were to look up the specs for lift, duration, etc at the valve they would be in the same ballpark. From a camshaft standpoint, the ECM won't even know the difference.

 

[seniorbear69]

thank you bucket ,im going to run with the pontiac cam to be safe .when i find out if the 350 block is any good i wil look into runing the 350 with tbi but that wont be any time soon thanks again .