[Mk2] [NA] N/A Running lean, turbo injectors???

[Paulhilluk]

So I have a Rev2 import with no EGR and recently installed a Pipercross foam filter from a friends BMW to it. It's a large filter and you can here how much air is passing through in idle. The engine is running lean and is putting out a fair bit of heat, so rather than finding a normal sized filter like normal people.. I want to add fuel an utilise the extra air..

Has any got any experience with adding Turbo injectors on to an N/A, I will run an adjustable pressure regulator perhaps alongside an AFR meter to keep an eye on things when I am driving.

It's a feasible idea with the parts going for under £100 so I wanted to get some thoughts from you guys first..

[synXero]

I'm not sure your ecu would handle larger injectors well.

I think this might, unfortunately, be the other way round. I suspect your fueling is weak rather than your intake being strong. I haven't heard of a cold air filter making a 3SGE run lean before.

[ashley]

+1 - you can run a 3SGE with no air filter and it won't lean out, sounds like you've either got a dodgy fuel pump, blocked injectors or bad fuel.

Standard ecu with larger injectors would run horribly rich.

[synXero]

Except your MAF sensor will FREAK the f*ck out... I tried.

[ashley]

Just re-read- rev2

Still can't see the air filter being "too good" and causing it to run lean though....

[Paulhilluk]

I knew the 3SGE was good, but no air filter an not leaning out! Don't think I'l be testing that any time soon though.

Looks like the pressure regulator is a good buy and I need to get the volt meter out..

Shame about the ECU not liking bigger injectors..

[ashley]

I knew the 3SGE was good, but no air filter an not leaning out! Don't think I'l be testing that any time soon though.

Looks like the pressure regulator is a good buy and I need to get the volt meter out..

Shame about the ECU not liking bigger injectors..

In fairness it was a rev 3, but why would no air filter make it lean out?? It would be fueling using the MAP sensor...nothing to do with how "good" the engine is.

I don't believe a rev2 would even run lean if you ran with no airfilter, but with an induction tube with the MAF sensor in it. The injectors on the stock NA engine are no where near maxed out, they could certainly cope with the increased air flow with no filter imo....but I'm quite happy to be proven wrong

[synXero]

Stick a Rotrex on it.

THEN it'll lean out

[Paulhilluk]

I knew the 3SGE was good, but no air filter an not leaning out! Don't think I'l be testing that any time soon though.

Looks like the pressure regulator is a good buy and I need to get the volt meter out..

Shame about the ECU not liking bigger injectors..

In fairness it was a rev 3, but why would no air filter make it lean out?? It would be fueling using the MAP sensor...nothing to do with how "good" the engine is.

I don't believe a rev2 would even run lean if you ran with no airfilter, but with an induction tube with the MAF sensor in it. The injectors on the stock NA engine are no where near maxed out, they could certainly cope with the increased air flow with no filter imo....but I'm quite happy to be proven wrong

I did not know how good the standard injectors were, and with TVIS seemingly allowing a larger plenum to increase flow at higher RPM I figured they would be close to on the limit..

Stick a Rotrex on it.

THEN it'll lean out

That's V6 money.. A future project, toy'd with the idea of an Eaton M62 from the Mercedes before I bought the car. Through work I can have stainless inlet manifolds 3D printed in Holland for around £4 CM3 material used by the machine...

[Tedtiler]

Have you confirmed your air /fuel reading?

The stock 3sge setup can't flow enough to lean anything out. If it actually is running lean I'd say your problem lies elsewhere.

The stock ecu just can't run turbo injectors. Probably wouldn't even start let alone run.

[Paulhilluk]

The stock ecu just can't run turbo injectors. Probably wouldn't even start let alone run.

All I needed to know...

I haven't checked the AFR yet, will do this on Saturday while it can be pulled into the garage.

Will look over the injectors and fuel pump also..

Cheers.

[rev3turbo]

just to point out none of the na 3sge engines had MAF sensors.

[Paulhilluk]

[Super_red]

Was going to say my Rev 1 N/A did not have a MAF or TVIS, it had ACIS, the one to shorten the distance from the plenum to the back of the valvet not TVIS, the one to increas port velocities. The Celica had TVIS on the N/A but this was before the MR2 started production, the N/A MR2 started with the generation 2 N/A engine and no TVIS.

I had a stupid ebay cone filter on mine and it didnt lean out. I think the N/A injectors are a different fitment to turbo aswell (certainly the generation 1 N/A had top feed not side feed).

[Marf]

I haven't checked the AFR yet, will do this on Saturday while it can be pulled into the garage.

Got a wideband?

The stock narrrowband O2 sensor will tell you diddly squat about fuelling under load, it doesn't have the ability to tell you anything accurately other than whether you are leaner than 14.7:1, at 14.7:1 or richer than 14.7:1.

[synXero]

just to point out none of the na 3sge engines had MAF sensors.

Beams does. I never fiddled with the intake on my gen3 3SGE so wasn't aware.

[ashley]

I haven't checked the AFR

So why do you think your engine is running lean?