This is a great observation for sure !

Given that I am basically riding the wastegate spring on boost control, how much additional power can be extracted from the turbo which perhaps can only flow "X"

Given there are only 5 ways to make more power

1 - Displacement

2 - RPMS

3 - Denisty of charge

4 - VE

5 - Chemical induction e.g. nos, etc

Clearly a head porting falls into the catagory of # 4 or VE enhancement, the issue I guess is what kind of effect the stock head as on VE.

I am assuming that a VE enhancement is of less effect as you reach the air flow limits of a turbo. Also, when you alter one part of the induction or exhuast you may not realize any significant advantage if other areas of the system have a restriction. I look it like a chain - its only as strong as its weakest link. If you have a bottle neck there is a limit to how much VE improvement you can realize.

I note two points. Its interesting to note that Sean and myself (9.5 and 9.4 in the 1/4 mile respectively) are both using the stock head.

Second point is that heads can flow better - or worse - at varying rpm ranges.

Head design and intake design go hand and hand together.

Its interesting to note that Head Games is claiming the same kind of power gains as Headway Performance on the heads.

I may go back and put the Evo back on the dyno at say 30 psi tomorrow before I swap the heads to have a comparision at two boost levels.

Al

 

I am starting to open my mind on this.

Perhaps we need to test it at a lower boost level also.

I may as well do this properly to remove any doubts.

Al

 

The VPRO does not start like an AEM not even close. It starts like the evo does with the stock ecu there is no delayed crank............


Sean

 

I am more than willing to go to McDonalds with you anytime and would love to test the Buschur head

Also - I am very willing to keep an open mind and will comit to run your head on my car this year if it can make more power than the Headway Performance head.

If what I have been told by some customers is correct you do some of the head work for AMS and I have seen their heads work very well on many cars including the famous Sharkbite car which made great power on our dyno

Al

 

Have you tried the crank wheel conversions on the AEM equiped Evos? It works really well.

There is nothing like a good ecu to make the car feel and drive well, the HKS prodcuts are first rate and IMHO their electronics are the best you can buy.

This is why I use the HKS twin fire on my car and can run 56 psi on the stock coils and wires with no problems.

Al

 

wow, thats impressive Al, looks like there really is no need for COP ignition systems based on the info you are posting here.

What plug gaps are you running?

How long have you run the HKS twin fire and the stock coils for ?

 

Al: Is this going to be an actual cylinder head testing event where you try several different manufacturer heads on your current configuration and see which one performs the best on YOUR setup? If so, it would be nice to see the following cylinder heads in your testing:

BR Stage 3
AMS CNC
Headgames
Cosworth

4 very well known and respected companies. Let's see which one performs the best (on YOUR configuration of course ).

 

Good to hear.

I say continue with race fuel, just at a lower boost level to see what she does. It's also not so hard on the car.

Also as a note..

Not wanting to brag or derail the thread..my people often question my dyno numbers.

24psi = 600whp on 94 octane
33psi falling to 31psi = 720whp on VP Q16.

Most 4g63's don't flow like this. I attribute my high power at low boost (on a regular 35r) to supreme head work. It would have taken a good 5 more psi I'm sure to make equal power on a stock head, which puts me inline with alot of "normal" people dyno numbers.

 

Thanks for clearing that up for me Sean

 

I am not doubting that it is possible to do it, but one thing I have noticed is the amount of timing you get out of a set of sparkplugs before they are done. Some of this may be fuel dependent as well, but that wouldnt happen on E85 for instance.

I look forward to your continued testing as well Al. I am currently porting the head for my 2.2 project (like this very night) and decided to check EvoM while eating my chinese. Interesting to say the least

 

I like turtles.

 

Hey Al....Why is there an AEM map sensor on the car? The Vpro uses a Black plastic one.

Care to explain

 

In the world of people with way too much time on their hands trivial pursuits become a form of entertainment.

My thread here is about testing two cylinder heads and quantifying the gains and losses. - PERIOD.

If you have any issues, concerns or other fixations, please feel free to send me a PM or pick up the phone.

To answer your question - the AEM Map and bung was left in place and the HKS Map sensor was installed under the dash into a vac hose that runs inside the car. You'll notice my stock coils and plug wires on there also too if you look closely, no need for any over priced ignition systems.

It was a temporary installation as I was simply trying to work with the product and gain some experience in how it works. I have a long way to go in my education on the product as it is rather unique in many respects.

The unit (the only one we have) belongs to my boss George and will be soon moving to the Bad Bish II which will be up and running again this week OR his '08 STI. I am going to stay with the AEM on my Evo for the time being, the V Pro was just a testing excercise.

 

I didn't think it was as you talked about Testing the Vpro. I'm just trying to get an understanding of how it functions and since I saw the aem sensor still plugged in I was just curious.

The overpriced Ignition system comment was uncalled for but since it was made...I'll issue the challenge ANY day. Our system will out HP the HKS Dli on your combination Hands down...say the word i'm up for the challenge.