I need a way!!!!

[89 tercel racer]

I got a 91 corolla gts coupe and i was wondering if there was anyway to maybe bypass the map sensor. Or what is the 7 pins on the map sensor for. See my plan was to put a turbocharger on my car, but the map sensor really limits that. If there is a way other than buying an ECU system please let me know. Thanx

[punter]

No you can't bypass the map sensor, you ECU need that to run the motor, I've seen a few cheap (read dodgey) turbo setups that just replace the 1 bar map sensor form an N/A motor with a compatable 2 bar sensor form a turbo car.

The one I saw used a 3sgte MAP sensor in place of a 4AFE one, and the car seemed to run alright, quite rich but alright.

Unless you know what your doing, or don't care if your car blows up don't try this.

The fact that you asked on this forum suggests to me that you don't know what you doing, so don't try it.

If i was to turbo a 4age, the first thing I would get would be a aftermarket ECU, its the only real way to do it.

[toyotaspeed90]

you can't bypass your MAP SENSOR because you DON'T HAVE A MAP SENSOR

getting around the AFM in a turbo setup is simple.... put the afm pre-turbo. otherwise the afm will freak out & send the wrong signal to the ecu when it registers boost

going turbo w/o an ecu to properly control it is doable (i was going to do it in my 86 mr2 before i sold it) but not a wise idea. You would need (at the very least) larger injectors, an adjustable FPR, and then have your CSI on a switch to turn on during boost (either a manual switch in the car or use a hobbs pressure switch)

either way, that's the cheap way to do it - depending on what you spend on injectors it can be quite spendy unless you REALLY know what you're doing

[punter]

Originally Posted by toyotaspeed90

you can't bypass your MAP SENSOR because you DON'T HAVE A MAP SENSOR

Hmmm... is that a UDM thing all AE92's i've seen are MAP,

Yea AFM is easier to mess with.

[toyotaspeed90]

map is easier to deal with - worst case scenario you would need a higher reading map sensor (they're usually rated in bar). but that i know of, most toyota map sensors read 15psi or lower boost just fine

yes, all usdm ae92 GTS's (and ae86 gts's) and ae82 gts's and aw11's were AFM based. NOT MAP BASED.

the ONLY (and few/rare) map based 4age's that were US bound were some of the 92 geo prizm gsi's

[REN69]

Not true... the Prizm GSi's were AFM based also.. that was a rumour someone started before, that the Prizm's were MAP sensored in the US when in fact they weren't.

As rare as they are, here's proof.

[toyotaspeed90]

um, all 88-91 gsi's are afm yes. however, some (and this is a very few amount) of 1992 gsi's actually are map based. I personally haven't seen one, but some oldschoolers over on mr2oc.com have seen a couple in the past 10 years or so.

[89 tercel racer]

Originally Posted by toyotaspeed90

you can't bypass your MAP SENSOR because you DON'T HAVE A MAP SENSOR

getting around the AFM in a turbo setup is simple.... put the afm pre-turbo. otherwise the afm will freak out & send the wrong signal to the ecu when it registers boost

The AFM works with suction so if I put the AFM pre turbo then what would be sucking it. The gate inside the AFM would not move. The car would not run very good.

Also someone told me that the AFM can handle a small amount of boost somewhere around 10 pounds or so is this right. And they said the computer is a "learning" ECU is there such a thing.

[Flashmn]

The AFM works with suction so if I put the AFM pre turbo then what would be sucking it

The turbo?

I'm gonna give you some advice, put down the tools and just stop, take your car to someone who knows what he's doing, since you obviously dont.
However if you want to learn, buy books, such as corky bells maximum boost and start reading.

[VooDoo]

you can bleed air going to the MAP sensor... its not the best option but it works.

[toyotaspeed90]

^^ it isn't a map based car we're talking about

and yes, unless you're an absolute idiot and install the afm backwards, putting the afm pre-turbo is the ONLY way to get a stock 4age ecu to run boost.