680cc injectors too much for just SAFC?

Lionel Hutz · 01-08-2005, 05:34 PM

I can get 680cc injectors for about $100 less than some 650cc ones from slowboyracing. I have a SAFC and I'm wondering if injectors that flow this much will give me trouble.
Thanks.

ALLBoostAWD · 01-08-2005, 06:15 PM

If you have an SAFC and you understand how it works, you can run 680's. You have the capability to add or remove fuel when ever you want. Just remember it is always better to run to rich than to lean.

nukefission · 01-08-2005, 06:27 PM

You can get away with it. Many have done so.

Ideally you'd want some compensation for the injectors coded into your ECU. This does away with the need to take so much signal out with the AFC. Taking out enough signal sufficient for 680s will bump the timing advance up too much when you're trying to tune it. Get compensation via dsmchips/keydiver and you won't have that problem.

4G63-GST · 01-10-2005, 08:30 PM

I ran 780cc injectors on a 50 trim tuning with SAFC with no problems. I also had a charged air AFPR, rewired walbro 255, & palmpilot w/datalogging.

Mirage2LTurbo · 01-10-2005, 09:07 PM

Have you ever heard of the search feature? I ran 750's and have seen 880's idled and tuned just fine.