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View Full Version : 720cc ideal


lbaron
08-11-2004, 09:31 PM
I just installed some 720cc injectors and a walbro 255hp in my 91 gst. The car starts up fine but the ideal is horrible. When I come to a stop and push in the clutch the car will stall 99% of the time. What is the most cost efficient way to correct this problem?
XakEp
08-11-2004, 09:59 PM
Get an adjustable fuel pressure regulator.
fusionsport
08-11-2004, 10:26 PM
why do you need the 720s? pull them out, drop the boost down, and drive the car until you can afford the supporting mods. If you are running a huge-ish turbo and just have to have the 720s, drop a MAFT on the car and save your pennies until you can afford proper EMS
sbiggi
08-12-2004, 12:42 AM
do you even have a AFC?
game-hunter
08-12-2004, 12:55 AM
You should get a fuel pressure gauge, adjustable fuel pressure regulator and a ECU chip made for those injectors to properly compensate for the longer deadtime and flow. You could get by without the ECU chip if you had a SAFC or MAFT but they'll only mask the problem since they don't properly compensate for injector deadtime. To compensate for the deadtime you need a modded ECU chip, Dsmlink or EMS. Really though if you weren't maxing out your old injectors there's no reason to upgrade.
lbaron
08-12-2004, 11:33 AM
I do have a old safc, the kind with the five knobs on front, but it doesn't seem to help out at all. I got the bigger injectors because I got them for 235 dollars and couldn't pass up that deal. I have a Evo 16g with 18 psi so I figured it was time to upgrade to something bigger.
Hal
08-12-2004, 01:08 PM
Calculate your adjust percentage as (450 / 720) - 1 for a adjust of -37.5%

Hal
lbaron
08-12-2004, 04:14 PM
would one of the chips from dsmchips.com help out with this problem? I might go that route. And if so where would be a good place in denver to get my ecu socketed?
Van
08-12-2004, 07:55 PM
Yeah, talk to Jeff at dsmchips.com. That is one easy solution. I have one. Awesome product, awesome customer service, big bang for the buck as far as driveability and correcting for the timing issues, etc.

I'd suggest that you ask for a chip that also has the phantom knock code in it. Just trust me on that one, you want it.