Hello Everyone,

I have a question that has been running in my head for some time and even with some research I couldn't find a descent / accurate answer to it.
So I thought I'd have your opinion in order to finalize this matter.
The question is :
What is the maximum boost that I can run on my Evo 9 EDM ?
The only modifications on my engine are :
1- Wiseco 85.5 Full HD pistons
2- ARP headstuds

The boost is controled by Grimmspeed solenoid

My target is to reach 29 PSI, Can I reach it without breaking the rods ?

Thanks in advance for your opinions.

 

This is a retarded question but yes it is possible if you have proper supporting mods... I ran 33psi.. but it tapered off to 28.5...

 

^agreed. this typically depends on the tuner and most of all the type of fuel used.

 

You should have a power goal, not a boost goal. boost goal is a waste and a bad baseline for building a motor

 

First of all, thank you for your replies.
As for the evaluation of the question probably you won't see it retarded if you look at it from my point of view.
As you've already seen from my quest that my only concern was the rods not the knock nor ....
+ I mentioned that the car is equipped with:
>> Grimmspeed in order for you to know that the boost can be controlled throughout the rev range not set by a manual boost controller
>> Wiseco pistons ......... u know why


I did not set a Bhp target cause I'm a little greedy and wanted to set the boost to 29 PSI and taper it to a less value on High RPM and then take the max BHP/torque it can reach with this boost (specially with the M2 cams and full BBk turbo).
Probably it's a weird way to think but I thought of it in this way.

So I'm gonna rephrase my question:
Will the stock rods of a 9 support 29 PSI of boost or I'm gonna hear a big bang ?

Thanks

 

The stock rods will support 9283472934782397492 psi if they have to, just make sure your torque doesn't exceed ~400 ft/lbs or else they won't be very happy. In fact, some tuners prefer to keep the torque down around 380 to keep everything safe. So that is what you should be looking at.

 

Still a retarded question...

Let me put it this way...you're concerned about what psi the air goes into your engine, but make no mention of the turbo size until your last post. Do you think that 29psi on a stock turbo is the same as 29psi on a BBK Full?

 

Well actually for me I thought it was the same, if it's not, could you please clarify what will be the difference since we are talking "boost" and revs.

 

whoooaaa, the bbk full will absolutely be a different 29 psi compared to a oem evo 9 turbo.

 

Can you be more specific and clarify the difference to me.

Thanks in advance

 

https://www.evolutionm.net/forums/ev...journal-2.html

-read the flow listings, hope this helps. but as the above had said, keep that torque below 400 or else....

 

Let me simplify this for you, imagine you need to fill up a bucket with as much water as you can (total volume of air going into your motor.)


The 'psi' you are referring to is the pressure of the water. Now try filling up that bucket with a squirt gun (stock turbo) vs a garden hose (larger turbo). Even if the pressure of the water coming out of the squirt gun and the garden hose is the same and you can apply constant pressure with the squirt gun, the bucket would be filled a lot quicker with the garden hose.

 

bigger turbo flows more air, means it needs less boost to make the same power