LowFreq

Either today or tomorrow I'll be replacing my secondary injectors with 720cc injectors. I'm going to need to drive about 45 miles to get to a place where I can dyno tune it. Will driving on the upgraded injectors prior to tuning be a problem? I've also got an SAFC and 3rd gen fuel pump.
TIA

rxse7en

I "believe" the 88s were High Impedance and if so, you'll to put the 10 watt, 10 ohm resistors inline for each injector.

http://www.rotaryresurrection.com/injector.html

B

LowFreq

Thanks for the info and instructions. My injectors came with the resistors so I'll be installing them as well. I was wondering if there would be any problems driving it with the new injectors un-tuned.

Sesshoumaru

iTrader: (1)

just check with a multimeter and if everything is ok you should be fine

worst case scenerio is you run pig rich when they open up.

NZConvertible

To run with 720cc/min secondary injectors, set all corrections above 3800rpm to -24%. This will make the ECU inject the same amount of fuel at it would with stock injectors, and the engine will run completely normally.

rxse7en

At -24% he'd be running ~550ccs, will this be a problem with his hybrid turbo?

OverDriven

I might be totally wrong here, but if you have an upgraded turbo, you better have 720 primaries and secondaries. How much boost are you running?

-Joe

gsracer

As far as I can tell from his post, he's just running 720 secondaries, not 720's all around. So, you'd set the correction factor to -13 percent above 3800 rpms.

When there is no need for the extra fuel, why waste it? The safc has a high and low map. On the high map the correction factor would be different depending on how much fuel he needs to inject.

This is a good idea, pre 3800 rpms on stock 550 injectors can be a deadly zone under high load.

LowFreq

Stock primaries, and I'm installing 720 secondaries.
Right now I'm running 12 lbs of boost. Been that way on the stock injectors(all 4 of them) for the past 2 years of so. At peak boost, my A/F meter is always fairly deep into the green(rich).

NZConvertible

So why are you upgrading the injectors? Do you have further plans?

LowFreq

FMIC going in this week probably. I'm researching water injection-so I may go that route as well.