Is multiport injection worth the extra cost??

[joyridin']

Originally Posted by eschaider

To the OP,

Tony and I are attempting to give you the information you need to avoid throwing good money after bad. Every EFI system that has been identified as doing a good or great job so far has been a speed density system. Like Tony has already said it is an electronic carburetor. If you know what you are doing with carbs you can buy jets and air bleeds waaaay cheaper than a speed density EFI system — and get very comparable results.

If you are unhappy with the behavior of your carbureted fuel delivery system right now and think you will fix the problem with a TBI EFI system because the task of tuning your carbureted engine is a bridge too far, you are fooling yourself thinking that an electronic carburetor (speed density EFI system) will be any easier.

The proper tuning process for the system to produce good drivability and power will be orders of magnitude more difficult than your existing carburetor. In the end you will spend somewhere between $1,000 and $2,000 for tuning and dyno time to tune the engine, depending on the ante at the dyno poker table where you live. That little Tupperware party at the dyno shop will repeat each time you change any of the variables I identified to you earlier, just like on a carbureted engine.

This is one of those upgrades where the penalty tax for cutting corners is extraordinarily high. To use the Knight's Templar quote from the Indian Jones and the Last Crusade movie, "Choose wisely. He did not!" If you didn't see the movie, the he being referred to is a dead Nazi lying on the floor of the cavern housing the many fake grails and the one real Grail. The Nazi chose poorly, he selected a fake grail and paid a high price.

You are Indy and Tony and I are the Knight's Templar. Unlike the Nazi, you won't die if you choose incorrectly — only your check book will.

Choose wisely ...


Ed

People have been using these systems for ages and love them. You also don't need tuning and/or dyno time unless you have a really hefty engine with a pretty large cam.

For a Cobra that isn't driven daily (or even weekly in many cases) with and engine that isn't a killer race engine, these systems work great. Quit trying to lead somebody down a rabbit hole when one doesn't exist.