Is it possible???

[Babz]

Hey guys. I have a 1991 Corolla ae-92 with a red top non-tvis small port 134hp 4age in it. i just wanted to know if it is possible to turbo this using the standard ECU?? Just maybe changing the injectors for bigger ones, putting on a better fuel pump and slapping on a fuel pressure regulator. Any help would be highly appreciated Cheers

[thespud]

Not really. I was chatting to one of my mechanic buddies about this on the weekend. His brother wants to turbo his Redtop.

Apparently - according to him, the MAP sensor in them runs off negative pressure in the manifold (Air sucking = negative pressure). As soon as you add any sort of forced induction, you introduce the concept of positive pressure to the system. So the MAP will possibly confuse the ECU if it gets positive pressure.

In saying that though, he seems to think that the only real difference between the GE and GZE is not the ECU - But rather what you stated and the internals.

So in other words, it should be possible, but you wont be able to run very much boost at all. Maybe 4psi due to the limitations of the weaker interals, higher compression ratio and the fuel map in the ECU and the MAP readings not being able to go above a certain level...

[freakinbox]

the 2 best 4age engine for forced induction are the 4agze and the 20v silver top, since the black top has weaker internals

[Babz]

So the 20valve with 10.5 compression ratio has stronger internals then th red top 16valve with 10.3 compression ratio?????

[freakinbox]

not sure if the internals are better than the 16v but out of the 2 20v engines the silvertop has the stronger internals

[toyotaspeed90]

ok.... the US motors are not map based....

if you want to turbo, you can use the stock ECU.... i would suggest larger injectors and a hobbs pressure switch to use pressure to turn on the CSI..... then the AFM needs to be installed in FRONT of the turbo.... that way it's reading negative pressure rather than boost

[Flashmn]

AFM doesnt read pressure, MAP does, AFM reads the amount of air flowing past it. it can thus be either in front or after, doesnt matter as the amount of air will be the same.

You can compensate for boost pressure using an FMU which raises the fuel pressure with a 1.x:1 ratio in refrence to boost.

[Babz]

Ive never actually heard of anyone mounting the AFM after the turbo. But does any one know if it is possible to mount the MAP sensor before the turbo??? So its always reading negative pressure?? Any ideas would be appreciated. Cheers

[REN69]

BTW it's 130hp IF that. Just run an aftermarket system dude.. why pussyfoot it when you can just go all out.

[thespud]

Originally Posted by Babz

Ive never actually heard of anyone mounting the AFM after the turbo. But does any one know if it is possible to mount the MAP sensor before the turbo??? So its always reading negative pressure?? Any ideas would be appreciated. Cheers

That may be possible...

[Babz]

Yea ok some sites say its 130hp anf the others say its 134hp but it doesnt realy matter as it all depends on how its been looked after over the years. for all i could have 140hp or even 100hp. LOL. I dont wana go all out as its my daily driver. I just wana slap in a tiny turbo, boost a couple of pounds and gain a couple of HP. Ive got a project. I have a 84 Carina and so il let uz know when its finished. T- series engines have alot of potential, Just a clue. As for this thread So far i understand that its possible to turbo a 4age with the standard ECU So im off to get my manifold made and do some trial and error, cheers ppl. Peace

[89yotarollagts]

u guys need to do some research !

http://forums.club4ag.com/topic.asp?TOPIC_ID=137557

http://forums.club4ag.com/topic.asp?TOPIC_ID=106146

[aaron7]

Originally Posted by freakinbox

not sure if the internals are better than the 16v but out of the 2 20v engines the silvertop has the stronger internals

The 20v silvertop doesn't have better internals than the blacktop, just lower compression. And don't try and run more than 6psi or so on the silvertop unless you feel like wasting a perfectly good motor.

[punter]

Originally Posted by aaron7

The 20v silvertop doesn't have better internals than the blacktop

The silvertop shares its rods with the ae101 GZE, these rods are big and f#$%ing strong, the blacktop has the smallest 4age rods and therefore the weakest.

Originally Posted by aaron7

And don't try and run more than 6psi or so on the silvertop unless you feel like wasting a perfectly good motor.

That ^^ is true.

Here in NZ people have turboed the stock bluetop on a standard map ECU, this setup works fin to 5psi.

As said above you AFM setup makes life alot easier.

[freakinbox]

yea the black top has lighter internals to help it get more power. and thats why I said the silvertop is better for forced induction .