Shaun

The power from a turbo is based on airflow through the compressor in to the engine and back out of the exhaust turbine. Porting a wastegate won't improve that power, but may effect the boost control.

Your uprated (stronger - higher crack pressure) actuator, allowing the potential of more boost at the top end could have an effect on power.

Ask Bob!

Regardless of this, your car made what it made so you obviously have a good overall set-up!

ScoobyDoo69

iTrader: (17)

It doesn't look like it's holding much more boost than a normal VF35 though up top?

Shaun

That is not the be all and end all. It is not all about boost.... we have no idea how much ignition is wound in to the map and perhaps his engine set-up is able to take that little bit more than usual.

ScoobyDoo69

iTrader: (17)

That's what I'm getting at, the porting would not allow more air, but the actuator would make it hold boost better. But what I'm saying is that at his peak power he's not making more boost than a normal VF35 running 330bhp, it would seem that this engine is taking a lot of advance. But even still, my VF35 with 20% meth doesn't make that power figure with a lot of advance, and similar boost..
I don't disbelieve the figures, but surely something else has been done to the turbo for it to flow more air at 1.4bar than a conventional VF35?

davedipster

A new turbo for my 2003sti-ppp is on hold now!
Can I get a safe 360hp 360ftlb from just a remap?

dipster

ScoobyDoo69

iTrader: (17)

The bhp but not the torque

aXeL

Well why don't we see if the results can be re-produced. I had a chat with S4U and we'll see what the tweaks indicated do for mine. If it works, great. If not then I still have an MD321T sitting in a box.

Big 'D'

I have already reproduced the results 3 times lol

I also understand very well how the turbo works.

Right lets see if I can put this down right in words:

1. I ported the wastegate to get rid of boost creep.
2. This worked but gave me lazy spool as the area of the wastegate cover plate layed bare to the exhaust gas in the turbine is increased due to the larger port meaning the wastegate spring is working harder to act against pressure from within the turbine housing.
3. Fixed the lazy spool by fitting an uprated actuator rated on my turbo at 1.0bar, this not only allows the turbo to spool quicker due to preventing any wastegate creep it allows for better boost hold/control top end.
4. The reason the boost is the way it is on the graph is down to me setting it that way on the Apexi, I could get it to hold much further through the rev range but I want my turbo and engine to last as it is a daily drive and I cannot afford to replace bits ***** nilly, as it is seems very safe.

Now how it all works (this is just an educated guess as to what is going on), on the std turbo the wastegate port is tiny by comarison to what mine is so when you are at full boost at the top end with the wastegate open you are allowing better gas flow through the wastegate than what you would see on the std turbo, from what I can understand of this the faster you can get the hot gasses away from the cylinders the cooler you are running your engine and then yes you can add more ignition as a result, so as I see it porting the wastegate on your turbo does actually improve your power output but you need to offset the increase in port size with an uprated actuator.

I have my flak jacket on ready now

Cheers Iain

aXeL

Really? I must've missed that in the chain. So you done this to three different STIs with VF35s and got good results each time?

TonyBurns

iTrader: (3)

I think Shaun said what I was thinking, eliminating the boost creep means you hold better boost, maybe a built in safety feature? you never know.
My only other issue would be if the impellar blades were up to the increase in temps, not sure if these are just ceramic coated or titanium....

Tony

Big 'D'

One Sti and two MY00 Turbo 2000s both running VF35s with ported wastegates and uprated actuators and both ran 350+, Bob was not expecting either cars to make above 330bhp, one of them ran 367bhp on his road dyno, the other was a little det happy and even with less ignition than the other car still made 355bhp which alone was 20-30bhp higher than Bob expected to see. So I am happy that the porting works, I would also like to point out that the porting on the other cars was carried out by the owners not me but even still the results speak for themselves.

I have another V3 Sti currently awaiting mapping with an almost identical setup to mine and a MY01 WRX with the same treatment but running an Sti TMIC to come yet so we should see some more results very soon

Cheers Iain

Big 'D'

As already said am I actually running the VF35 any harder than I would be if it were standard or have I actually taken some strain off of it by allowing better gas flow top end? I think the porting makes the turbine housing way more efficient. The std VF35 would have probably self destucted by now if I had not spotted the boost creep when I did so I am quite happy with the results and the safer boost.



Cheers Iain

aXeL

Well in that case, very well done sir!

Now forgive me for asking if you've already mentioned it (Am both excited and knackered - long day!) could you let me know the part details on the actuator please?

Interestingly, some time ago Turbo Dynamics gave me a quote to do the whole works, except the actuator, on my VF35 for £105 but they didn't think it would do much for it which is why I went out and bought a larger turbo. However if I can even get merely close to yours, I'll be very happy.... At least till I buy my next car anyway....

Big 'D'

What other mods do you have and what model is your car?

Cheers Iain

scoobyboy1

iTrader: (16)

Congratulations, great result on a VF35!!! There is always going to be doubters, but ive seen some mad results from impreza's over the years, Like a turbo 2000 with the standard TD04 get 12,7 quarter mile time over and over at santa pod!!! also saw a guy with a UK blobeye STi with the standard VF35 make 380bhp on Powerstation rolling road day!!!

Maybe there are some good vf35's out there, Just hope mine is one of them.
Done the porting to the wastegate and exhaust side to a couple of VF35's I have had, but not had them on the rolling road, But both my cars have had the standard 440cc injectors, so I think fuelling would be my main problem getting a higher bhp numbers, But quite tempted throwing a uprated actuator on and some 550cc injectors after your result!!

What actuator did you use????

DaveBeck

iTrader: (12)

Outstanding results.

I only made 311 on a ported vf35 lol

DaveBeck

iTrader: (12)

Outstanding results.

I only made 311 on a ported vf35 lol

Big 'D'

Mine is not ported as such, only the wastegate is ported not the housing.

Cheers Iain

ScoobyDoo69

iTrader: (17)

Is there a reason why you haven't answered anyone mentioning the actuator?

Big 'D'

It makes a huge difference with the uprated actuator especially spool, I used the Forge adjustable actuator its the VF34 one on the website. If running a frontmount you will need the red spring and if a top mount the blue spring will do with a bit of rod length tweaking, I set all of mine to 1.0 bar actuator pressure.

Cheers Iain

Big 'D'

None, just waiting to see what mods people were running before I answered, the type of intercooler setup has a huge effect on what spring rating to use thats all

Cheers Iain

beef-on-the-bone

iTrader: (5)

would these applying principals work on any turbo????

Big 'D'

My gut instinct says yes, based on the more gas you can flow topend = more bhp.

Cheers Iain

Big 'D'

Just thought of a better way of explaining this,

Think about it the exhaust gas passing through a turbo can go 2 ways, through the turbine housing which spools up your turbo and out the wastegate which usually just controls your peak boost output by bypassing the turbine. Now to increase gas flow you can do a few things:

1. Increase the size of the turbine housing, this increases gas flow but introduces lag, basically any increase in internal exhaust volume pre turbine increases lag/spool time.

2. Port the turbine inlet, this will speed up gas flow into the turbine and aid spool but gains will be restricted by the size of the turbine housing and wastegate port size.

3. Increase the wastegate port size, allows for ellimination of boost creep but also allows for better gas flow top end on boost with the wastegate open. Minimal effect on turbo spool especially if mated with an uprated actuator.

4. Combine 2 and 3 and the output could be even greater, I will do this myself and dyno the car at the end of the month to see if any gains are apparent.

Cheers Iain

davedipster

Saving up for a md500 series, don't want my vf35 turning into a grenade!

dipster

Big 'D'

Fair enough, neither do I as its my daily drive, I am very confident that after 2 years of playing with this turbo that I am heading in the right direction

Cheers Iain

dabow

iTrader: (19)

anything is posable, polishing & porting can/will deliver more power, has done for years. turbos even more so

may be in the next couple of year, we'll be buying uprated turbos from this guy. it happens
acouple of years ago, there was no way to properly map the early classics
then esl came and proved it.

i say, let the guy have his moment, his motor gave a very good figure.
after building my own engine, and getting a good figure my self
being told id get a low bhp with my spec, & proving some wrong

its a buzz, nowing you did that.

Big 'D'

Thanks mate, its a huge buzz alright

Cheers Iain

dabow

iTrader: (19)

the way my set up is, sounds great.
thats becouse i've made changers here and there.
with a cat, and a completly standard td05 i got 341bhp and 338lbft torque
and using an esl live map board. porting one of the older td05's could release alot more power. but dont properly know how to do so didnt bother

Big 'D'

Huge pat on the back for that one fella nice figures esp with a cat thrown in

Cheers Iain