DChan415

Is there anyone out there running 850cc primary injectors with the PFC and not running way too rich at idle???

I'm thinking about going back to 550's....

I'm not sure if its the street port or the 850's thats causing the rich idle that wont go under 900rpms.

Benjamin

My street port won' allow it to idle smoothly until it's at 1100rpm.

I'd also like to know about the 850's as primaries.

-BN

abflug-t78

i had 550 and 1600 with t78

i had very bad and lean transition time because of the difference in injectors....

i went to 850 pri...set it to 65% and .04 and car idles fine...transition time is better... this is a must have for single turbo...

the secondary larger injector is needed but your on the primary when you romp your foot down and you could run lean until sec kicks in....

give and take.. go 850 pri

SPOautos

Well, I'm running 850's with those settings and I'm rich as hell lol

Are you guys running o2 feedback? maybe this is the difference, I think the guys getting a decent idle are still running O2 feed back, I need to hook mine back up and check this.

STEPHEN

smacho7

Rotoary Performance is setting mine up with 850 primaries right now ... They will tune it too.

I pick it up in a week ... I'll have something to say after that ..

twokrx7

iTrader: (1)

SPOautos,

Running O2 f/b may require that the O2 pump be functional and feeding through the manifold, upstream of the O2 sensor. All of this stuff has been removed from my car and O2 f/b, when turned on, will try to engage at idle ... rpms bouncing all over the place.