Conversion from carburator to throttle body - PeachParts Mercedes-Benz Forum

t walgamuth · #1 10-08-2018, 07:59 AM

HI. I'm having trouble with the Edelbrock on the Cobra. It's fine when just tooling around town and so forth but on the autocross course when turning left and right and accelerating and decelerating it creates a lean miss making the car pretty much undrivable.

Just wondering how hard it is to put in a throttle body system? For starters I assume a new fuel pump is in order.

P.C. · #2 10-08-2018, 10:53 AM

Quote:

Originally Posted by t walgamuth

HI. I'm having trouble with the Edelbrock on the Cobra. It's fine when just tooling around town and so forth but on the autocross course when turning left and right and accelerating and decelerating it creates a lean miss making the car pretty much undrivable.

Just wondering how hard it is to put in a throttle body system? For starters I assume a new fuel pump is in order.

Which generation Chevy small block is this?

t walgamuth · #3 10-08-2018, 11:14 AM

I'm not sure. First I suspect. It is pushrods for sure.

Dubyagee · #4 10-08-2018, 11:19 AM

Holley sniper efi

P.C. · #5 10-08-2018, 11:24 AM

From the ad for the Cobra:

427 cu in motor with 550 HP.

Features include:

- Rodeck 350 alluminum block.
- Billet Crank by Scat Cranks (41/8" bore x 4" stroke)
- Connecting rods - Track Lite by Manley. Ross custom pistons.
- Compression ratio of 10.2 to 1
- Aluminum 210cc cylinder heads by Air Flow Reasearch
- Solid Roller cams by Crower, Jesel Rocker Arm Shafts and Cam Drive kit
- Jones Front Pulleys
- 4 Weber 48 ida' Carbs
- Intake Manifold by Pierce Manifolds

t walgamuth · #6 10-08-2018, 02:03 PM

Yes. I have a copy of that too.

P.C. · #7 10-08-2018, 02:26 PM

Well I hope so!

(Point being that some of these specs may influence fuel injection system choice and sizing.)

t walgamuth · #8 10-08-2018, 05:02 PM

Yes. Thanks!

Mxfrank · #9 10-08-2018, 07:27 PM

Quote:

Originally Posted by t walgamuth

HI. I'm having trouble with the Edelbrock on the Cobra. It's fine when just tooling around town and so forth but on the autocross course when turning left and right and accelerating and decelerating it creates a lean miss making the car pretty much undrivable.

Just wondering how hard it is to put in a throttle body system? For starters I assume a new fuel pump is in order.

Is the float height adjusted properly?

t walgamuth · #10 10-08-2018, 08:04 PM

I don't know. Trouble is it runs fine if I'm not autocrossing, also ran fine at Winchester speedway. I can adjust all I want but until I can run it hard around corners I won't know if it is right or not.

iwrock · #11 10-08-2018, 10:15 PM

https://www.holley.com/products/fuel_systems/fuel_injection/terminator_efi/terminator_4bbl_tbi_kits/

There's a few companies that make EFI kits that swap in place of a carbureator, though I think you may have to swap your intake manifold for one that has a single carb.

iwrock · #12 10-08-2018, 10:17 PM

Just add a fuel system kit and away you go.

https://www.holley.com/products/fuel_systems/fuel_injection/terminator_efi/fuel_system_kits/

t walgamuth · #13 10-09-2018, 06:34 AM

That looks pretty good! Thanks iwrock!

t walgamuth · #14 10-15-2018, 04:41 PM

I just ordered one of the Holley TBI setups.

Tony H · #15 10-16-2018, 12:44 AM

As I intend to use an aftermarket EFI and ignition on my 5.6 project I had read everything I can find about them. I will be interested in your feedback. What fuel pump are you going to use? Will your Cobra accommodate an in tank fuel pump?