RomRaider

hey there guys.

I've been out of it for abit as I moved to brissy and new job ect. cars still running great on the stage 1 tune but I'm getting my exhaust done when I get back from holidays. x force tv kit so looking foward too the stage 2. is it much more noticable? I remember on my old liberty you could feel the difference and that was just a na 2L.

as far as not making more power up high goes. the td04 is used on the old 2L engines and its not even really that big for them so on the 2.5 It's pretty tiny. once the 2.5 gets in the higher rev range the engine itself starts sucking in more air then the turbo can produce therefore it can't make boost at the higher rev ranges.

I've been looking at Bf52s which are used in the 09+ which is the sti turbo made to fit on our car so its a direct bolt on no nods needed and makes 195 kw stock on the 09 cause it boosts up higher. kw is tq * rpm so the higher your tq is later the higher your kw is. thats how a Honda s2k can make 180 or something with only 200nm cause it revs to 9k

VF52 is not the same as the STi VF48 but yes, it is a good turbo VF52 holds boost for longer thus higher peak power It also can run more boost for more midrange torque

I agree with what you are saying but more power or kw doesn't mean a quicker car. Having a fatter torque band over more of the gear (rpm) is what makes your car quicker, not mention better to drive. A lot of people tune just to try and get a high peak power figure which is cool.if that's what your in to, but I would instead tune to get a big power band with a smaller turbo like a vf52. I have seen good 12 second quarter miles with our cars with a good vf52 setup.

You will love stage 2, so much more power than stock or stage 1. Get a good Cai as well like a process West or make one that only sucks cold air and you will get an extra gain from that. Some people say not to go Cai, but you can feel and measure the difference, as long its sucking cold air and not getting a lot of heat soke.

Aftermarket tmic makes a good gain as well and just bolts straight on, take about 10 minutes to change.

I have a new Rom I will put up soon, it's just a revised version of my last one which has been made a little more power and its tables have been refined.

yeah that exactly right depends what your tuning for. you can throw a huge turbo on and get heaps of power in the last 1000 rpm which would look good on paper but horrible to drive.

our turbo is too small though. I think a vf52 would be perfect size it still spools up prett
y quickly but hold the boost a lot longer.

Full boost at 2700rpm from a well tuned VF52 setup Extremely broad torque output, gives a massive surge of power as well

No way?

In what gear?

Or is it all in the avcs?

When could a well tuned VF43 or VF48 expect full boost?
edit: btw what do you mean by full boost? I would say 1.4 bar (20 psi), sounds right?



Cheers,
Patrick

AVCS + the turbo design itself in 4th gear. They can be tuned for lightning fast response but it is really easy to strangle them up if the WGDC or cam timing is wrong

Getting turbo back Xforce exhuast done tomorrow, pretty excited. Does anyone know where i can find a guide on AVCS i cant find much info on it, i know the basics, but how do you tune it?

Ok so i got a XForce TBE and running the stage 2 map. I got abit of knock at 6200 rpm and 2G load so trying to fix that. And im hitting pretty high boost, over boosting abit, it spikes at 20 psi :O It really feels nice and free flowing though.

And ive been doing abit of reading has anyone tried adding some AVCS in the late rpms?

You do not want ANY AVCS overlap as you approach peak power on such a small turbo. The TD04 exhaust turbine back pressure will have power drop off and cause issues with poor cylinder fill.

20psi on a TD04 is not advisable, they should be on 18psi peak bleeding back to no higher than 13.2psi by 6000rpm

Oh yeah i can understand that because on a bigger turbo you will have more then enough boost there to flush out the cylinder.

And why no more then 18? is it working the little turbo too hard? At only low rpms it shouldn't be too bad, i understand its out of its efficiency range however the guides ive read say that the inter cooler solves that anyway.

Check g/sec of airflow between 18psi and 20psi. They flow similar air, just one wont take as much timing

What other mods do you have?

On my 3" turbo xs i have never seen fine learning knock above 3500K rpm on these rom's. and its only ever the minimum amount at about 3000Rpm in the mid load range 1.6 - 2. I'll put a reminder in my phone to upload my newest rom, i keep meaning to put it up but forget to do it.

I have found that 17.8 PSI target boost is the highest you should go on our setup as any higher doesn't yield any performance gains and is just blowing hotter air. There is gains to be made leaning the fuel a bit up high espesically if you have a aftermarket TMIC.

Also played with AVCS but like throttlehappy said after about 3500 RPM adding AVCS is going to have negative effects, you can add more down lower if you want to try and spool quicker, but you lose power in the process and is pointless on our turbos. If you have a turbo that spools later like a VF52 you can tune AVCS to make it spool quicker by adding extra AVCS in the spool sections of the tables. This worked well when i was stage 1 but after putting a TBE on it was pointless on this turbo(TD04).

The CAI makes a difference as well, try the Process west cai or any one that sucks only cold air, you need to rescale your maf though but its worth it even just for driveablity, its much more responsive and hits boost quicker. The sound is a bit much for somepeople though. (took my wife a while to get used to it )

I'm buying a TMIC and vf52 soon, that should be fun to tune. Anyone else wish to upgrade to vf52 with me??

Ive got no other mods yet apart from that K&N air filter you had too. Im planning on getting a CIA and new intercooler, i actually have a greddy front mount my friend gave me but dont have any of the piping or connections and will have to remove my front bumper ect.. so i dunno.

And yeah ive done abit of reading up on the AVCS and all clear now, i was abit confused with something else ive read. I bought a awsome book about turbos and tuning them, however there is alot of stuff that is specific to this car that im still yet to learn.

Also they couldnt put my heat shield back on so i bought some insuation stuff of ebay however ive read that putting it directly on the turbo which will keep heat in and increase power but obviously reduce the life of the turbo if not allowed to cool so either need to come up with another solution or get a turbo timer.

if you still have your stock heat shield you can put it back on, u just need to trim the back and leave off all the extra rubbish that was going down the dump pipe.

I have mine on and it works well, i might wrap the lower portion of the dump pipe when i have time.