Turbo Aveo Project trouble

[zaq_b21]

Sorry if I am repeating an old topic here but here it goes...

I've got a stock eclipse turbo , blow off valve , and small intercooler , I was wondering what else I needed to get this project underway.

I already have a sandwich type plate in mind for mounting this turbo to the stock manifold.

I was going to buy an oil sandwhich plate for the oil lines.

I was also going to get a manual boost controller.

I already have a super afc II from apexi but, I have no clue how to wire it to an Aveo.

I was wondering if I needed bigger injectors and or fuel pump for this project as well ?

I only plan on running around 5 - 7 pounds of boost ...

Thanks in advance for your help

[MMamdouh]

piping and hoses.... you need charge pipes, vacuum lines, coolant lines and oil lines

i don't know if that turbo got built in wastegate or not so if it doesn't then you got one more item to buy

bigger injectors and rising rate fuel pressure regulator are recommended... for the mentioned level of boost i don't think you need a bigger fuel pump

exhaust system will be custom made for this project with appropriate pipe size... i recon 2.5" is your max diameter given the level of boost you are running

gauges... basically you will need boost gauge and oil pressure gauge, an A/F meter is a good idea but an exhaust gas temp gauge is way better and you can use it for tuning the engine after the turbo

this is all what i can think about for now... i am sure the guys will add anything i forgot

MMamdouh

[PrecisionBoost]

Well.... the biggest thing I see missing is a turbo manifold.

You can get away without larger injectors but you will really be pushing the fuel pressure high to get the additional fuel out of stock injectors.... another simple alternative is to buy a throttle body spacer plate that has an additional injector installed.... which is then controlled by a small programable fuel computer.

If you increase injector size your fuel mileage will go to hell and your stock computer will push way too much fuel at idle resulting in a number of issues such as fouling the plugs....

You can get away without an intercooler as GM's 2.0L 8V ran just fine on 7psi of factory boost without intercooler..... but I would highly recommend a water/methanol injection system if you decide you don't want the additional costs and headaches of installing an intercooler.

The SAFCII is easy enough to install.... I did it on an Optra5 which uses the same basic system as the Aveo.

Keep in mind that all the SAFCII does is change the MAP signal going to the ECU to try and fool it into thinking it needs more fuel.

The SAFCII can only be used for fine tuning of the fuel.... you will have to get the car on a dyno and have the Air/Fuel checked as you adjust a Rising Rate Fuel Pressure Regulator.

If you use the SAFCII to make big jumps you can throw out the ignition advance and cause engine significant engine knock.... which will freak out your ECU and it will retard timing and throw error codes.

Also keep in mind you have to figure out a way to block the boost going to the factory MAP sensor as could potentially break at 7psi of boost.

Ideally a check valve has to be used... personally I wouldn't recommend a cheap one from the local autoparts store as they have a slight offset and do not return to vacuum operation right away.

I would recommend the "missing link" from Synapse Engineering as it equalizes pressure immediately.

In the end there are a number of issues to overcome.... personally I think the turbo manifold is the biggest one if someone doesn't already make a manifold for the AVEO

[exist3nce]

I would recommend the "missing link" from Synapse Engineering as it equalizes pressure immediately.

I bought the missing link to try it out. I was very disappointed. Its true the MAP sensor never saw any boost (verified with OBD2 scantool), but there was a delay through the missing link when the vacuum signal would change causing delay in fueling and timing adjustments from the stock ECU. The delay was small (probably less than 1/2 a second) but it was very noticeable and annoying while driving. I took it out after 1 day, its for sale if anyone wants it.

[PrecisionBoost]

I bought the missing link to try it out. I was very disappointed. Its true the MAP sensor never saw any boost (verified with OBD2 scantool), but there was a delay through the missing link when the vacuum signal would change causing delay in fueling and timing adjustments from the stock ECU. The delay was small (probably less than 1/2 a second) but it was very noticeable and annoying while driving. I took it out after 1 day, its for sale if anyone wants it.

Really? That is odd, it was designed to be superior to the standard check valves in the sense that it has a smooth transition from boost to vacuum

That is to say in a plain old check valve there is both a delay and an offset, that is to say you need a certain amount of vacuum to re-open the check valve.

What you get for MAP values is 0PSI for a half second and a quick jump to 8 PSI of vacuum.

The missing link is suppose to create a smooth transition during that same period so you get a gradual transition from 0PSI boost to 8PSI of vacuum.


It should be noted that an electronic map clamp is fine for keeping the ECU happy but it does not prevent damage to the MAP sensor.

In this particular case the boost is low, so it is theoretically possible to use an electronic MAP clamp without a check valve.... but I'd guess 5-7 PSI is really getting close to the limit of a standard 1 Bar MAP sensor with respect to breaking pressure.

Personally I don't know the exact pressure our GM MAP sensors will break, it could be 3 PSI of boost or 20 PSI

I do have a spare 1BAR MAP sensor.... so perhaps I will try it out but the results won't be perfect as the "one time" breaking pressure will be higher than repeated pressure pulses.

The one time is like taking a plastic ruler and applying lots of force until it snaps.

In the real world it would be more like taking the ruler to the point where it bends fairly hard, letting off and doing it again, then repeating it thousands of times.

That is to say both tests would break the ruler but the force required to do so would be less in the second test when compared to the first test.


Existance.... what are you using now in order to block the MAP sensor from damage and keep the ECU from seeing boost ?

[exist3nce]

Existance.... what are you using now in order to block the MAP sensor from damage and keep the ECU from seeing boost ?

Its a small custom made piece with 2 OEM toyota check valves which have very low cracking pressure mounted on a piece of aluminum. The check valves vent the boost pressure to the atmosphere.

MAPandCheckValves.jpg

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[PrecisionBoost]

The design posted will save the MAP sensor and bleed off boost as opposed to block it ( so MAP will not see 7psi.... probably closer to 1 PSI which is fine for ECU's and MAP )

I guess the biggest difference is that most factory check valves are cheap plastic units that can crack under higher temperatures.

The typcial plastic valves will also have a hard time with large boost levels ( can actually break apart internally )


I belive the Missing link is simply an aluminum caseing with stainless balls and springs ( similar to that of a PVC check valve )

This makes it impervious to temperature, has next to zero wear and is capable of taking very high boost levels ( think I read 40psi somewhere )

It's also better looking than having a couple of plastic check valves.


For most low boost applications two check valves like Existance showed will work.... as long as you ensure that the check valves are kept away from heat sources such as the turbo manifold.

Perhaps Existance can give the part numbers for the toyota check valves and price if he has it.

[exist3nce]

Perhaps Existance can give the part numbers for the toyota check valves and price if he has it.

Sorry to say I have neither of those. The check valves my shop had lying around in their "misc" stuff. All I know is that they came stock on some mid 90's camrys. I can take a picture of them it if anyone is interested.

[Nemasys]

I just cheked out the site for the missing link, they seem to have a few models, maybe Ex chose the wrong model? If theyre as good as PrecisionBoost says shouldnt it work fine?

[PrecisionBoost]

Not sure why his shop had issues with the missing link and delay.... they seem very knowledgeable so I doubt they picked the wrong model.... mostly the models are for fitment as opposed to the actual design.... which is really quite simple.

Perhaps the one he got was not functioning correctly and one of the valves was sticky.... who knows.