What power is the TD04 standard wrx turbo good for? Just out of interest?

 

280

 

Another for 280.

Any more takers ?

 

280 is the average, have got one sitting in my garage that made 295 on PE rollers (was a cold winters day though)

 

So i do need to upgrade then. Ok thanks for your help guys!

 

Depends what you want.

If you're after more than 300 then yes you'll need a bigger turbo, however, remember there will be a trade off between response/lag, so bigger isn't always best.

For instance, a well mapped TD04 with usual mods may 'only' give you around 280 as said, but the response and spool characteristics will be excellent. You will miss this when going bigger, especially on the road where it's the most important factor IMHO..!

Save the money and spend it on other areas (if not already done) such as handling and brakes..

You'll end up with a far more 'effective' fast road car by reducing these bottlenecks and balanced mods.

As an example, I'm waiting for some AP 4 pots to be fitted (been on back order, should be here next week..) and in the meantime my brakes are becoming seriously sh@gged. So much so that I can't use the 340odd BHP I'm running without having some brown trouser moments. A milk float would pi55 all over me at the moment.. . Even before they became so worn, the uprated pads with decent fluid and braided hoses were definately the weak point, hence this upgrade..

Power is nothing without control as they say..!

 

I am working on my own project, and working to prove that a td04 can run 300bhp with supporting mods.. It can be done.

 

It can be done, but you will be wringing it's neck to do so.

 

296 is about as much as you'll get frrm a TD04 on a set of "acurate" rollers.

Managed that a while ago on some DD Rollers with fairly average air temps.

 

DD ?

 

I believe tracktive made 305bhp on a td04 running 05ron fuel and a lot of torque on their classic, which was in jap performance mag, serious mods though..

 

309.4 here on a 54 plate car and 322lbft of torque on a DD dyno with Optimax in the tank..Harry it is possible but requires the best supporting mods (Nothing with Ebay written on the tin....lol) and a good map...


This path does make for an effortless drive much like driving a 2.5 with instant power available from 2500rpm...It all depends on your driving style and the rev band you require to operate in as to whether to go this route or not..If you like to just punch up through the box from low down and change early this would be great , if you prefer to rev the nuts off it then I would switch the turbo to a VF34 or 35 and make the most of what they have to offer further up...

 

wow look at that torque come in!!

thats like 1K lower than mine on a td05!

 

Im after 300+ Bhp but want some reliablility from the engine too so think i will upgrade to either a TD05 16g or more than likly a VF34 as these spool up quicker so i have been told, therfore will reduce lag?

Thanks for the advice guys!

 

Would choose the VF34 over the TD0516g every time...Think you are making the right choice there Harry and best of luck....

 

Spool threshold and lag slightly different mate.

Spool threshold: point in the rev range where the turbo starts to produce meaningful boost: folks usually ask at what point 1bar is developed.

Lag: delay in response to throttle application

VF34 would be better than Td05 in both respects I'd imagine. My experience is with the VF35 which has better spool characteristics than the VF34, but looses out a little in top end power.

Ns04

 

Am i making the correct choice in going for the VF34 then, bearing in mind my target is only 300 - 320bhp??

 

If spool is your priority then it might be having a word with Andy F about one of his TD04 hybrids.

ns04

 

Yup, that's what i went with. Basically a sacrifice of some possible power compared to the other turbos mentioned in exchange for excellent responsiveness & driveability.

 

Hmmm. Without looking at a TD04 compressor map, I'd speculate that although a TD04 may be able to make 300bhp, you'll be caning the **** off it to achieve that figure, whereas a TD05 is just cruising right there.

 

your right, but while your turbo spools up, my td04 has made you a dot in my rear view mirror. Just kidding, but possible. It all comes down to the early boost. Most people love it.

 

with a tdo4 up at the 300bhp mark (if it made it) the intake temps would be getting quite high i imagine,I would go for the upgraded turbo,this way you would at least have more to play with when you had got used to the 320bhp you have.

 

they will hit 300 safley (if running front mount) but not many car actually reach that

 

With the amount of money spent to acheive those numbers with supporting mods with a TD04, you'd probably spend less money upgrading the turbo and running a fairly safe 320bhp.

There're always decent VF35's going second hand for reasonable money for example and to be honest spool isn't a lot different anyway. Once you get buzzing there's very little lag through the gears.

If the spool really concerns you then you can always get your mapper to put in more ignition advance in the mid range and take away from the top end. This would increase peak torque a little but would reduce peak bhp as a trade off but make it very drivable.

 

VF35? Theres too many bloody trubo's out there to choose from....

Ok, after reading your comments above, im after a reliable turbo thats going to be happy with 320BHP as i may want to add more toys to the car in the future and wont want to be splashing out on another turbo then. The differences in the spool up time mentioned above wouldnt really affect me too much i think, suppose id lake to have the acceleration over the top end speed, as surely thats better for track days etc, when you need the power to be there coming out of corners etc....

Sounds to me like the VF turbos would be better than the TD05's as they spool up quicker but what benefits does the VF35 have over the VF34? Im gunna have to make a decision this week and wanna make sure its the right one.

The VF 34 is on the bugeye STi's if i am correct??

 

Both will achieve 320 with the appropriate suporting mods.


VF35 slightly better spool
VF34 slightly more top end.

Not much in it.

Ns04

 

VF34 came on JDM V7 STI RA's, the normal STI had VF30's.

VF34 is basically a VF30 with Rollerbearing.

VF35 is basically a VF30 with a smaller P15 exhaust housing, (VF30+34's have a P18 exhaust housing)

VF35 will spool faster than the other two, but loose out on the top end power, probably about 20-30bhp less than the VF34 (with the same supporting mods)

So for what you require i'd say a VF35 would be your best bet BTW i run a VF34 on mine.

 

My suggestion is you try a couple of scoobs with these turbo's as you WILL miss the response of the TD04, even with a well mapped VF35..! You soon adapt to the different driving style very quickly, however there are some who never do and regret the upgrade..!

IMHO (obviously based on my VF35 WRX) it's definitely a step in the right direction. The car is so much stronger, pulling all the way to the redline, if you're not careful hitting the limiter..! As said, once it's spinning (1bar ~2800/peak 1.5bar ~3200) the acceleration through the gears is phenomenal, with no lag between gearchanges..

If you're around the midlands at anytime, you're welcome to have a blast in my VF35 WRX..

See "view my scoob" for full spec..

 

Is that offer open to all Scoobynet regulars Jason ?

 

Where does the AFP4H TD04 hybrid rank in this discussion ? I was lead to believe it was a good WRX upgrade to maintain the low spoolup characteristics of the TD04.

AndyForrestPerformance

I'm sure there are other TD04 hybrid models around too or is AFP the only source ?