Has anyone here done the swap RETAINING their TBI system?

If so, how does she run?

 

It ran awful without chip tuning. After you get the chip down, its not too bad. On the stock chip it went 93 mph in the 1/4 mi, but Ive never really had the time to get it running correct since then. Ahhh one day...

 

I have the 350 with Vortec heads, LT4 Hot Cam and using a 454 TBI with . Still waiting for some parts to assemble the motor and drop it in the Camaro. I had a chip made with all the info regarding the engine. It will still need to be fine tuned when I get her running but if the EFI will not work then I will go with my back up plan on using a carb. As Chuck stated, a custom chip will be needed to make your engine run smooth.

 

big difference between a custom chip......and chip tuning.

A custom chip is just some one's best guess. Chip tuing is what you do to tune your vehicle to your particular combo. May I suggest the DIY prom board, and traxions intro to prom burning.

 

I'll be doing that as well. I have the cable and software to datalog once the car is running but still need to get the other equipement to "burn" a chip. I just needed a chip to get me close enough to fire the engine and drive for a while. My 92 Camaro will not be a daily driver since I have 2 othe vehilces to use.

 

The motor I would be doing this to would just require a best guess tune. I am not trying to squeeze hp out of it.

All it needs to do is spin the 38 inch swampers I have on my Blazer and get decent mileage.

Right now it is stock intake/headed, but has a Comp Cam in it, and it doesn't run all that great. It runs good, but needs a tune for the cam.

I am planning on later installing a set of stock Vortec heads on it, with a performer or performer rpm carb intake with an adapter plate (now that I know how much the GM Vortec TBI intake is).

Do you guys think that 350 ft lbs. is obtainable with this setup?:

350 TBI
.425/.440 lift cam with 252/260 duration
Vortec heads
Edelbrock Performer intake
TBI spacer
open element
Stock TBI unit
stock exhaust manifolds
2.5 inch y-pipe exhaust running to a single 3 inch with a CatCo cat and a Flowmaster

Do you guys think this could make about 300 hp and 350 ft lbs?

 

I have a '95 K1500 350 TBI on small 285/75/16s. I'm running a CompCam EX249H, stock everything else. I got somebodys "best guess" and its OK up to 3000/3500 and then its done. I should have done it myself.

If you are not willing to learn how to "burn your own", then a carb and recurved distributor will gain you better results. On the other hand, if you know how to tune a carb and recurve a distributor you already have the basics of tuning, you just have to apply it electronically.

I haven't done it yet, but after driving an '05, 6.0L, 5sp, 4.10s, 4x4, 2500 that couldn't get out of its own way because of "Torque Management".... I think this old TBI truck of mine may have more potential than I think.

 

alot of times, a best bet won't even get ya out of the drivway untill the second third or fourth best guess.