is andial fuel enrichment required on 3.3 turbo

[fredmeister]

Looking to find the best protection against lean running of 3.3 liter turbo.
What is the best system to install to provide more fuel under higher boost conditions......is the Andial system still the best deal out there......without converting to something other than CIS?
What else can be done to keep CIS but run higher boost...1.0 bar without running into lean trouble?

[iamchappy]

Im going to get slammed for this but they work great, a 911 SC CSV injecting just before throttle body for better atomization, fired by a hobbs pressure switch. you wont go lean. It's what ive been using and it works well and is cheap.

[rsrfan]

Most are now running a modified fuel head from Imagine Auto for high horsepower CIS applications. The head is CNC ported to increase flow up to 15-20 %. Should be good up to about 475-500 crank horsepower, however WUR mods may be necessary.

JP

[DonE]

Originally posted by rsrfan
Most are now running a modified fuel head from Imagine Auto for high horsepower CIS applications. The head is CNC ported to increase flow up to 15-20 %. Should be good up to about 475-500 crank horsepower, however WUR mods may be necessary.

JP

Without modifying the WUR, this mod does nothing for running lean. Its like buying a bigger garden hose, but using the same sprayer.

The WUR controls the amount of fuel going to the injectors by regulating the fuel pressure to the metering plate. By modifying the pressure the WUR provides to the metering plate, you can alter the AFR. If you have a nearly stock, or mildly modified engine, this adjustment will work just fine.

To do this correctly, you must do this on the dyno.

[iamchappy]

Word of advice from Henry, lowering the pressure on the WUR makes it run richer, increasing runs leaner.
Add a micro fueler and run safely rich on boost.

[David]

The safest thing to do would be to install a lamda sensor to check the AFR on boost, even better would be to put it on a dyno and check AFR.

For short bursts of 1 bar boost, you should be OK if you have a larger intercooler. I think the big problem is when you add a bigger turbo or go to the track.

[Henry Schmidt]

The problem with CIS injections is that they tend to go lean at cruise.
Fuel head modifications can not completely reverse this tendency.
The problem is that turbulent air creates more lift on the fuel metering plate than smooth air.
On medium to hard acceleration the air moving the plate is turbulent and when you cruise the engine (even under boost) the air flow goes laminar and the plate settles making it run lean. If you don't compensate for this situation you will encounter lean running at cruise.
A lose loop system with O2 sensor and some sort of boost enrichment are, (I believe) necessary to completely control this phenomenon.