Leaning out...

[spardikis]

Hey guys, new to this turbo thing so im not to sure about something..

Here is just an example based on gettin the question answerd... cheers

Guy A has an evo or honda or what ever and wants to raise boost, surely its not as easy as just puttin in a boost gauge and a boost tap... what about fuel?? How do u stop ur car from leaning out and then blowing up while raising boost on a stock car with out a full tune???

cheers guys

[Scandrew]

Usually stock management will try to do it's best to provide safe mixtures via a MAF. Extra boost = extra airflow = higher voltage from maf = ecu pumps more fuel in. That's if it's all on a stock setup. Though if you have aftermarket management it's probably most optimum and safest to get a tune done after turning the boost up.

[saxman]

our cars don't use a maf, they use a map.


With an ecu set up(which you should be using with a turbo... there is absolutely no good reason not to), you can up the boost to however high you have the ecu tuned for. Going higher means the ecu won't provide more fuel.

the stock honda ecu won't worth with boost at all, so that issue still needs to be addressed regardless of if you're going to up the boost or not.

[spardikis]

umm i was more interested in what it would do to and EVO 1 that I just picked up in New Zealand while i was on holiday

[yourfather]

well, it's like anything in life, you push something too hard without the proper support structures and everything, and eventually it will blow up.

it's like building a house, you gotta have a good foundation for your house, otherwise, everything on top of it ends up being a big pile of crap!

[GSI-PSI]

boost it like that and youll blow ya engine SIMPLE

[Slow96GSR]

Lean mixes can melt things!!! If you have good injectors and a adjustable fuel pressure regulator and if it's a good turbo kit, you will be fine for 1-2 pounds more. But I bet you want to take that stock 8-10 psi and go to say 15-20 psi? You need a engine management system or a VFAC setup. I would not boost the turbo until you are ready to tune the car, and I would do it on a dyno. But that's me.

[saxman]

no, you don't need a vafc set up... increasing fueling for higher boost without any conrol over timing is a VERY bad idea


vafcs are good for one thing... being pretty little gauges

[yourfather]

and they do it well!

[Slow96GSR]

no, you don't need a vafc set up... increasing fueling for higher boost without any conrol over timing is a VERY bad idea


vafcs are good for one thing... being pretty little gauges

You would be wrong the Apexi V-AFC is a fuel controller. It doesn't do timming. You can get one that also does the VTEC timing but not any more than that.

Read here! (http://www.apexi-usa.com/product_electronics_detail.asp?id=201&pageNum=1)

Oh V-AFC = VTEC-AIR FUEL CONTROL

[saxman]

You would be wrong the Apexi V-AFC is a fuel controller. It doesn't do timming. You can get one that also does the VTEC timing but not any more than that.

Read here! (http://www.apexi-usa.com/product_electronics_detail.asp?id=201&pageNum=1)

Oh V-AFC = VTEC-AIR FUEL CONTROL

um... I think you need to re read my post...

[yourfather]

what he said is:

you need something that can adjust timing

It's a Vtec- Air and Fuel Controller...

VTEC timing isnt Ignition timing, only camshaft engagement timing.

Therefore, it isnt useful,

Therefore it is a pretty gauge.

didnt mention the V-AFC being able to do anything but fuel and vtec engagement.

[spardikis]

I was just chattin to a mate who rides in nissans and he said that the MAF sensor
(in the evo)will adjust the fuel to the level of boost up to maybe 14 or 15psi. basically more air = more fuel. He also said that it wouldnt be a problem as long as it didnt start pinking. Also have a mate with a STI and another who has a Legacy and both have increased boost to this level 14 psi with no problems>??

Im guessing that a boosted honda is different?

[bennyBear]

very different mate, purely because honda's were released N/A. Therefore all of the air fuel mixtures, timing etc are set to run a Naturally Aspirated engine.

Whacking a turbo kit on a honda engine without a tune & ecu is like giving a blind man a rubix cube, it wont know what the f&^% to do with it!!!! (nuff said)

Evo's, Liberty's (some) and STI's all come from the factory with turbo'd engines. Therefore, the factory ecu is created with this in mind, and knows how to run a turbo setup!!

Cranking the boost up on a factory turbo car *can* be done safely as long as you dont go crazy (i.e 6psi - 18psi!!) as the factory ecu can compensate for this to a reasonable extent!

Enjoy your car mate, they r fun stuff!!!!

Benny.

[spardikis]

Yeah thats what i thought... prob still give it a tune eventually..
cheers.

now just got to sell my Mint yellow 00 ITR