Timing control yes/no ??

[andrewb70]

Do they all allow you to tune the timing control also? And do they work with or without a timing controlled distributor?

Yes, the point of having the EFI system controlling the timing is that you can program what timing you want based on RPM and load (vacuum). Here is a link to the Holley Sniper system instructions. Ignition is covered starting on page 25.

http://documents.holley.com/199r11031r.pdf

Andrew

[a67]

Do they all allow you to tune the timing control also? And do they work with or without a timing controlled distributor?

There are some systems that have a fixed non-user tune-able timing MAPs. Off hand I don't recall which ones they are.

Bob.

[a67]

What distributor did you use for the Pontiac V8? I've heard the 301 turbo distys can be made to work.

Push comes to shove, can use the bottom of the distributor that matches the block, and the top of a Chevy distributor. The bodies can be welded together. Need to take into account the inner shaft length.

I know a guy that did this for a 455 Olds engine.

Bob.

[andrewb70]

Push comes to shove, can use the bottom of the distributor that matches the block, and the top of a Chevy distributor. The bodies can be welded together. Need to take into account the inner shaft length.

I know a guy that did this for a 455 Olds engine.

Bob.

I am pretty sure that GM went to HEI ignition on all engines around 76-77, so there are HEI distributors available for Pontiac engines.

This should work with some minor modification as described in the Holley Sniper instructions.

https://www.rockauto.com/en/moreinfo...250581&jsn=397

Andrew

[a67]

I am pretty sure that GM went to HEI ignition on all engines around 76-77, so there are HEI distributors available for Pontiac engines.

This should work with some minor modification as described in the Holley Sniper instructions.

https://www.rockauto.com/en/moreinfo...250581&jsn=397

Andrew

That works for the Holley Sniper system, but that distributor is not a computer controlled unit. Many EFI systems require a computer controlled ignition control module (ICM).

Bob.

[andrewb70]

That works for the Holley Sniper system, but that distributor is not a computer controlled unit. Many EFI systems require a computer controlled ignition control module (ICM).

Bob.

I'd be curious to see what other EFI systems you're talking about.

Andrew

[a67]

There are many, any of the GM systems that drive a DIS or distributor. These include systems offered by Howell, Dynamic EFI, and Affordable fuel injection (AFI). The mega/micro Squirt systems, and the user tuneable FAST systems.

I am sure that there are others, just don't have the time to research it.

Bob.

{edit: did discover that the Haltech GM systems also require a computer controlled distributor.}

[andrewb70]

There are many, any of the GM systems that drive a DIS or distributor. These include systems offered by Howell, Dynamic EFI, and Affordable fuel injection (AFI). The mega/micro Squirt systems, and the user tuneable FAST systems.

I am sure that there are others, just don't have the time to research it.

Bob.

I looked these up briefly. None of them offer a built in wideband O2 sensor. Why would anyone buy these?

Andrew

[a67]

I looked these up briefly. None of them offer a built in wideband O2 sensor. Why would anyone buy these?

Andrew

Cost?

The FAST systems do. Besides, getting the fueling in line is easy. And if the system is always learning from the WB, what happens when the controller or sensor goes bad?

I could ask the same question about fuel only EFI systems. Why buy one when spark timing is more important?

The difficult part is getting the spark timing correct. Not only at WOT, but for street driven vehicles it is important for drive-ability.

Bob.

[andrewb70]

The Holley Sniper is under $1000. Once the fuel tuning is done, it is advisable to limit the O2 compensation to a small amount in case if sensor failure.

Timing is not automatically adjusted, but it's not rocket surgery to get it right in most hot rod applications.

Andrew

[a67]

You need to broaden your view on why folks buy other systems. Such as, will the Sniper work on a TPI system? Others require a system that supports emission controls. I know I do which completely eliminates the Sniper as a viable system.

Bob.

[andrewb70]

The Sniper is an "all in one package." It is meant as a carburetor replacement system, and includes all the hardware, ecu, 3.5" touch screen, and wideband. Tuning can be done with the touch screen or with free software that runs on a laptop. Tuning can also be done "live." Personally, I am not a fan of any throttle body system, but it is better than a carburetor, assuming there is a way to tune it.

To each their own. I understand that people have different ideas of what they want and need.

Andrew

[railroad bob]

My project uses a 4.6L DOHC modular motor. This engine does not use a distributor, rather it has crank and cam sensors for timing, and individual coils for each cylinder.
Does anyone have experience using EFI with a similar motor?

I have been considering a FiTech sytem, but their tech says I would need to use a coil pack driver.
The EFI would gather a tach signal and run fuel only.

Are all the after market EFI systems configured similarly?

I don't really want to pay for feature I can't use.
Is there a system that runs fuel only, and that I can use with a turbo also.

Thanks...

[andrewb70]

My project uses a 4.6L DOHC modular motor. This engine does not use a distributor, rather it has crank and cam sensors for timing, and individual coils for each cylinder.
Does anyone have experience using EFI with a similar motor?

I have been considering a FiTech sytem, but their tech says I would need to use a coil pack driver.
The EFI would gather a tach signal and run fuel only.

Are all the after market EFI systems configured similarly?

I don't really want to pay for feature I can't use.
Is there a system that runs fuel only, and that I can use with a turbo also.

Thanks...

You will definitely want timing control with a turbo!!!

The Holley HP will do what you want it to do and way more.

Andrew

[railroad bob]

Thanks Andrew, I'll research that system...