Why not boost the ETA?

[donesoldout]

heres some pics of the turbo/intercooler.

[u3b3rg33k]

Awesome! Pics?

I have been gathering parts slowly for the i head swap, and have several turbos at my shop, all in due time...

not sure if anyone was still interested, but i have a turbo e

What people don't realize is that when you apply more air to an engine (boost), you are raising the effective compression (compression the engine sees while running).

So, if we have a 9:1SCR and add, let's say, 6psi over atmosphere, it translates to about 12.7:1 effective compression. You are still pounding the same ammount of air in that cylinder as a 8.5:1 motor at 7.5psi - although I am simplifying this, you get the point; cam, porting, chamber shape can all have effet on the outcome.

Let's discuss,

-John

No. Wrong Wrong Wrong. Do not say things that - you'll confuse people.
6 psig on a 9:1 engine is NOTHING LIKE an N/A 12.7:1 engine.

Compression ratio is not related to manifold pressure. It is very much related to static compression ratio and valve timing.

For example, miller cycle engines hold the intake valve open until the piston is half way up, allowing them to run a 14:1 expansion ratio, while only having an effective 7:1 compression ratio (as half the charge has been pushed back into the intake manifold).

[ForcedFirebird]

not sure if anyone was still interested, but i have a turbo e

Awesome! Pics?

I have been gathering parts slowly for the i head swap, and have several turbos at my shop, all in due time...

[donesoldout]

not sure if anyone was still interested, but i have a turbo e

[Danny]

hey Danny did do the F.I. setup yourself...if so...do you have a built thread...

Look at all threads made by me.

Its called the ultimate budget build.

[eur04lif3]

I run 7psi on my 10.5:1 m42.

hey Danny did do the F.I. setup yourself...if so...do you have a built thread...

[ForcedFirebird]

I made this thread a long time ago, and my plans have changed for the car, so I doubt you will be seeing my eta boosted as it is. Once I get around to swapping in the GM ECM, then I will be putting the 885 top end on and then maybe boosting that (I have all the parts, just saving to buy all the gaskets etc, and need a new timing belt while I'm in there).

As far as the cam bearings and using the double springs, I could have sworn I have seen people here that drilled the oil passages in the head to use the other three journals to convert the eta head to 7 bearings.

You are absolutely correct on the airflow equaling power. We all know that an engine needs to be somewhere around 14.7 for idle/cruise etc and when in power enrichment, we need to be somewhere around 12.5. Since the AFR requirement from gasoline and diesel is the same, the you have to derive that equal airflow from either engine will make the same power.

When one thinks that a diesel is moving more air because of more compression, this is correct, but when you are running at 1/2 of the RPM's and 2x as much compression, you are still going to flow the same amount of volume.

The reason a diesel and a gasoline turbo generally looks so different is because with high compression the exhaust gasses will have a higher volume, but because of the less RPM's, a lower velocity. This is why a gasoline turbo tends to have a small turbine housing in comparison to the compressor whereas a diesel turbo tends to have a turbine as large or larger than the compressor.

The eta would be a tough to make a choice of a turbo. With the lower compression of the gasoline, yet semi-lower RPM's like a diesel, one would probably have to try a few different turbos to find one that was optimal.

[eta]

A 130 hp diesel draw the same ammount of air as a 130 hp petrol motor. Flow of air determines power not boost revs e.t.c. More revs only makes more power if their is the air flow at those higher rpm's.

A boosted eta would be nice. A smallish turbo (I wonder if the 524/324td kit would work, it may be to small though) should give the required air flow or the engine. Which one would take some looking at compressor maps of different turbines. It would retain good off boost torque and when the wategate opens their should be a good surge of torque. It won't last long like in a diesel. I imagine it will be all out of ideas above 4000 rpm. So it won't be a racer that will out drag a corvette but it could make a very usable daily driver.

Putting i springs in an eta head with the eta manifold is foolish. The i springs would allow it to spin at higher rpm's but cam wear could be an issue due to the 4 bearing cam and the manifold/head does not flow well at high rpm's. That is why the optimium shifting point on a eta motor is about 4500 rpm (on 10.2 CR motors should be similar though on your 9:1 CR motors).

FI on an eta please do it. I want to but I have porject already.

[nando]

Oh so you're saying a diesel is stupid to turbo for the same reason..?

are you going to pull a boat with your eta turbo?

no?

then shut up.

[Kerrath]

dont diesel motors flow more air than gasoline motors? like 10x the ammount? so lower revs on a diesel motor would be like higher revs on a gasoline motor?

No. Are you sure you're not thinking compression? Diesels typically have 2 or more times as high compression as an average gasoline engine. But I'm quite sure they don't draw more air. In fact, since they usually operate in lower RPM ranges than gasoline engines, they would draw less air since the volume of the engine times RPM is lower than in a gasoline engine.

Take that with a grain of salt, I'm a doctor not an engineer.

[mikegar]

Oh so you're saying a diesel is stupid to turbo for the same reason..?

dont diesel motors flow more air than gasoline motors? like 10x the ammount? so lower revs on a diesel motor would be like higher revs on a gasoline motor?

[itsbrokeagain]

Oh so you're saying a diesel is stupid to turbo for the same reason..?

haha pwned...

[JdmEuroNorth]

No... The reason its stupid to boost a eta engine is revs... HP is calculated (TQ x RPM)/5252 and if you arent spinning very many RPMs you aren't going to be making much power... also the head doesnt flow very well compared to an i...

Oh so you're saying a diesel is stupid to turbo for the same reason..?

[gothguy70]

Can i get upgraded valve springs and cam to swap into my 2.7?and what/where best sorce?I could prob get cheaper than buying just the head.
This car is my DD and should really leave it alone but it's just such a fun car.Just runs out of rpm's too soon.A friend offered it to me for $400 and I grabbed it to tinker with.Has turned ito great car.would just like some more power.It had issues with the ds and csb.also the axles.that's all good now.

[Kingb]

the i engines are 2.5l and the eta's are 2.7l. I am guessing you are wanting to put the i head on the eta. You'll need the head, intake, harness and DME. Or you can just swap the whole motor for an easy upgrade without tearing into the motor. There is more to this, I have never done it myself.