New info about the hiccup - SRT Forums

esteinmaier · 12-04-2007, 10:06 AM

OK, guys. I've nailed down a little more info.

Symptoms:
Hiccup at arbitrary RPMs, more common at certain VE points as well as RPM.
Aftermarket tach running off of the coil pack wiring dives during hiccups, leading me to believe it's spark related, not fuel related.

New info:
I recently switched to Low-Z injectors. 1680cc to be exact. I haven't tested them with a multimeter yet, so I don't know the exact impedance. Changing to these injectors has increased the frequency of the occurance dramatically, to the point that it's difficult to drive the car. Tach still dives during hiccups. I have played with the opening times, as well as current limits quite a bit, and changing either variable does not change the frequency of these events.

Still running MS1, V3, Boost Junkie's most recent NGC code. No high-res.

Shawn, does this info help you look for the problem?

boost junkie · 12-04-2007, 01:38 PM

It sounds exactly like the tach spike issue that affect every other MS out there. It's usually caused by poor grounds or other electrical noise.

esteinmaier · 12-04-2007, 03:10 PM

So it makes sense that it would happen more after changing over to low-z injectors?

boost junkie · 12-04-2007, 03:25 PM

Indeed it does. There's a lot more load on the board with low-Z injectors. I strongly suggest getting the PWM board or using a resistor box.

CASPERAMC · 12-05-2007, 07:05 AM

i swapped to srt stg 1 instead of my stock 19lbers and i havent had a hiccup yet, which is pretty nice. the car is still not fully tuned yet, so i dont want to speak too early

Floyd · 12-06-2007, 01:28 PM

SRT S1's are low impedance right? I always get confused on that...

boost junkie · 12-06-2007, 03:53 PM

Just about all OEM injectors are high-impedance nowadays...

Floyd · 12-07-2007, 06:13 AM

Ok so im understanding everything im reading...
S1's are highs but since I have the V3 board with the flyback board I dont need anything else but to hook them up. Im assuming I have to run the high res code too huh?

boost junkie · 12-07-2007, 12:42 PM

You don't need anything special to run high-impedance injectors. You don't have to run the high res code either. However, it will run better with it.

Floyd · 12-07-2007, 12:51 PM

Ok so im going to look into how to load a new code and all. Im still new to all this but once I do it once im good to go.