trevsjwood

iTrader: (2)

To quote Delta Dash figures alongside RR results just adds to any uncertainty.

Big 'D'

If you say so , I am going off Bobs word/experience really not the figures, I for one think that counts for alot

Cheers Iain

trevsjwood

iTrader: (2)

Can't argue with that, he looks after the mapping on my car.
Trev

Anders_WR1

iTrader: (8)

What's the difference on wastegate size between VF34 with P18 hot side and the VF35 with P15? The VF34 usually makes slightly more peak power than VF35 because of the P18 housing, but not this much more.

Anders

Big 'D'

And mine mate, I did not mean to sound rude either.

Cheers Iain

Big 'D'

At the end of the day its all about gas flow top end, if you are talking turbine housings ie P15,P18 and P20, the larger the housing the better the gas flow is top end which in simple terms = more power potential but will increase lag, what I have done is find a way (not saying I am the first) of increasing gas flow of a turbo top end without increasing the turbine housing size, this allows for better top end power without sapping spool.

Cheers Iain

Bob Rawle

The VF35 runs a P15 turbine housing, the right porting drastically improves the air flow and also balances the exhaust to input gas velocity and volume.

As Iain mentioned when I installed and mapped his Simtek my butt dyno said 370 ish.

But it isn't your normal VF35, and also Iain has put together a mod combination on his STi 3 that really compliments the engine and the ecu.

Iain sent me the graphs yesterday hot off the press but I have yet to look in detail as I was mapping until late evening yesterday and also all day today.

The high IT figure obviously skews the plot but as has been mentioned by Martyn who operates a DD rolling road himself the impact is relatively small.

Including iain's three cars have been tuned using this mod, for each vehicle the total mod combinations were different, Ian's has always been the best of the three but the other two are chasing his heels.

My replacement engine is getting close to going in the car (project has ended up going from short engine to virtually a complete long engine hence the delays) and its my view that I should be able to see 400 bhp from my VF43 using a similar approach, if nothing else it will be great fun trying.

So well done Iain, as already mentioned by a few posters its not always necessary to change what you have already to get good results, and the response of this car is in twin scroll league.

cheers

bob

Big 'D'

Well I was not expecting that one Bob, thank you very much

Twin scroll indeed well I never

Cheers Iain

prodriverules

iTrader: (52)

What is the mod combination then Bob?cheers

Big 'D'

Nothing more than what I have quoted already

Cheers Iain

prodriverules

iTrader: (52)

How far from maxed are the injectors at that figure Iain?

feckdeamon

iTrader: (1)

Great result 'D'!

Are you intending to offer this modification as a service or would you care to share some pics of your porting?

Big 'D'

I would have thought no where near to be honest, they should see me well into the 400bhp margin and as mentioned before its not like I am running huge boost or really straining the turbo. Bob would have the exact duty details etc but I would guess they have a fair bit more to go.

Cheers Iain

Big 'D'

Happy to do both to be honest but as each car is different the setup for each individual car may vary.

Cheers Iain

aXeL

2005 STI 2.0lt PPP, last of the Blobs!
Ported the exhaust manifold, up-pipe (Venturi version), intercooler Y-pipe, throttle body.
CDF Racing lightweight pulley set with under-drive pulleys
GGR induction kit with custom insulated air feed.
Front subframe removed
And remapped 50-60 times.

Big 'D'

As you are running with the std Sti top mount I would use the VF34 Forge Actuator with the blue spring as this should allow you to achieve the 1.0 bar base pressure I have been using. If you dont mind me asking what power do you have now and what intake and exhaust you are using?

Cheers Iain

Myles

iTrader: (40)

Just trawled through this thread on return from my hols! Iain is doing the same thing to my vf35, porting standard headers, and fitting the forge actuator I won for a steal! Once I get the funds together for the remap, I will post up the results.

dabow

iTrader: (19)

same to you mate, keep it up.
you may work out you can release even more power from the slightly smaller charges out there.

as alot say out there, its all a learning curve with these cars

Big 'D'

Out of interest axel, is your wastegate not ported yet and have you checked your turbo for boost creep? I mean simply connecting a pipe from the turbo outlet to the wastegate actuator (bypassing the solenoid basically) and going out for a wide open throttle run in 3rd and 4th from about 3000rpm in each of these gears to see what the boost does. I believe all 35s boost creep on a full decat so its worth checking, as an example I fitted an Apexi Avcr to a mates 02 UK Sti a while back which had been mapped with full decat etc, when I was out setting it up for him I first did a base pressure run with the apexi set to off and the turbo made 1.4 bar and was still climbing up to me backing off the accelerator, he had been running the car without a boost gauge so he would never have been aware there was an issue, boost creep means you have zero control over the turbo and it will drive itself past any predetermined boost settings on your map/boost controller so its not safe to run a turbo in this condition.

Cheers Iain

Big 'D'

Welcome back mate, ready when you are really

Cheers Iain

aXeL

Haven't touched my Turbo at all yet. Also had Duncan from Racingdynamics go through my setup including the boost levels. So far it's fine and no boost creep at present. The car hasn't been dyno'd. Duncan estimates about 320ish currently.

The intake is a GGR induction kit mounted in an insulated cavity to keep hot air away from it but still fed from the front rather than the wing.

BTW when you say a 'forge' actuator, is that a brand a or type of actuator - since I know nothing about actuators except what they do!

Big 'D'

Do you have a boost gauge fitted?

I am not doubting Duncan but I have yet to see a std 35 on a full decat that does not creep.

The car I mentioned above had also been mapped etc and no boost creep was spotted but it was there alright.

Forge is the make of the actuator mate

Cheers Iain

aXeL

Yeah, Duncan didn't use a boost gauge. Don't ask me how he checked. He does have a good rep so I'm inclined to trust him. I'm guessing one can tell by reading the absolute manifold pressure sensor when data logging. However, assuming that my car too suffers from boost creep, will porting the wastegate and using a better actuator help to reduce the effect?

BTW it's not a full decat as it's the pro-drive setup. I have no center cat but still have the high-flow down-pipe cat, sorry should have mentioned that earlier.

Lewak

iTrader: (1)

Well while on Hols up north and having aread on this I now can't wait to get mine down to bobs and see what is what.

Good work Iain

Will Give you a ring soon about popping round on monday afternoon to do the swap


Cheers

Dave

Big 'D'

You should not have the boost creep on the Prodrive exhaust setup mate so that should be fine. But out of interest though as you do have a highflow cat and no centre cat I would be interested to see how the VF35 behaves would you be happy to see what the turbo base pressure is and if it is indeed holding and not creeping?

Again I am not doubting Duncan at all I just know that on a full decat it will creep like a bitch so there is a slight chance that on your setup that creep may also be present only due to the fact that it is more free flowing than the std exhaust and yes the only way to fix this is by porting the wastegate.

Cheers Iain

ZEN Performance

Most don't creep. I would say one in 20 vf35 cars with full decats I've mapped have crept. The APS 3.5" exhaust is well known to make them creep REAL bad, one (now defunct) tuner had a habit of slapping one of those on, raising the boost cut and letting it rip for 370hp of uncontrolled boost creeping fun, but it did sell them APS exhausts!

Big 'D'

Thats funny as all of the ones I have seen did creep with full decat exhausts, must have been just sheer luck that I found a load that were creeping then I guess.

Besides its far better to be safe than sorry I guess, I would check

Here are 3 examples of cars that had definate boost creep from the VF35

My own car V3 Sti, with std headers and full 2.5" decat and FMIC = huge boost creep
A MY02 Sti UK with full 2.5" post turbo decat and std headers and TMIC = huge boost creep
A MY00 UK T2000 full decat, FMIC and harveys headers = huge boost creep

These are just 3 examples there are more and others that I have helped with the issue over the phone and net too so it is a very common issue and is not restricted to any particular model of scoob or exhaust size, if you have a VF35 fitted and have a full decat I would defo check it for boost creep.


Cheers Iain

aXeL

I think it's safe to say that when the car goes in, there's no harm in getting the boost checked properly

I'm also thinking I might get all the turbo work done to the 321T as well. I've been told it will make little difference to a 'T' but then that's what I was told about the VF35 too and look how all of yours turned out!

Big 'D'

No harm at all mate, I wish that you could all have a sit in my car and see how well the little 35 pulls it would surprise alot of you I think. As Bob rightly mentioned earlier each car will have its own compliment of mods as each owner is different in ideas etc so the outcome from each car will be totally different, all I know that is if the VF35s fitted to the cars that Bob has mapped recently had been std (unported wastegates) they would not have made the power that they did. You were probably told that porting the turbo would make little difference but I have not ported mine only opened the wastegate out and fitted a stronger actuator, I will try a mild porting of the turbine inlet to see if there is any further improvement .

Cheers Iain

aXeL

You mean you haven't already?! I was under the impression you've a porting fetish and an aversion to right angles.



Does this get you hot?