scooby-tc

iTrader: (2)

no @ fly

scooby_matt

Something can't be right

scooby-tc

iTrader: (2)

theres nothing wrong with the car,it was mapped on the road not on the rollers and DD rollers tend to be the most accurate.Its more like 370bhp on the road as it holds 1.45 bar to the redline rather than the 1.1 bar it gets on the rollers

Still wouldnt mind knowing where these guys get there bigger figures from though

EddScott

Can I be a PITA and ask if anyone knows about VF29s? Theres not much on SNet about them.

Only ask because theres one available and a fair bit cheaper than the Vf35.

How come theres so many different turbos used in Imprezas?

moto

Yes. Me! I'm very happy with it.

I chose it over a TD05-16G after reading about Andy F's Project WRX in Scooby mag. It showed that although the TD05-16G produced a higher power figure, the TD04 Hybrid covers more ground on the road.

Varboy

have a VF24 myself so agree that it would trounce a TD04 but would it trounce a TD04H in real world situations?

With a 6 spd box I think maybe yes but with the standard 5spd there are times when you are going to get caught at 2.5 - 3k with little boost and smelling the exhaust fumes of the car with the TD04 in front

Varboy

I'm seriously considering going from a VF24 to a TD04H, have you compared your car with someone with similar spec and a TD05?

cookstar

iTrader: (6)

Apart from fuel pump what other mods are necessary to support a 16g?

Are injectors REALLY necessary

moto

Unfortunately not. Would be interesting to try! I only went from what I read in Scooby mag. It showed the TD04H having a good advantage lower in the rev range, which the TD05 never managed to make up.

moto

I went for STI intercooler, decat up pipe, sports cat downpipe, decat centre, back box and fuel pump with my TD04H. I'm on standard bugeye injectors with a FPR.
I'd guess STI injectors would be a necessary on the 16G.

cookstar

iTrader: (6)

I have full decat, STI8 Top mount already.

finchyboy

I have full de-cat sti equal length headers sti pinks and vf35 fitted to my 05 wagon it produced 320 brake 400nm torque at only 1.25 bar (didn't want do over do it on wrx bottom end) down at powerstation in Tewsbury. I bought the VF35 of the fleabay for 200 notes they seems everyone wants V34's and you can pick vf35's up for a song (don't know why because it really is a peach of a turbo) A word of warning though these turbo's are known to suffer from boost creep so maybe an idea if your going that way to get the wastegate ported as i have. Turbo Dynamics did mine for about £45.It's i top turbo that spools almost as quick as a TDO4 and i reckon if i cranked up the boost it would prob push 350bhp.

Floyd

iTrader: (9)

As said previously by others, I have tried both turbos. I've also had a TD04 Hybrid. The VF35 is my pick of the lot. I was going to choose a VF28 but the VF35 is a better all rounder, although it may lose a tiny bit of spool.

I ported my waste gate and ran it on ported headers and a DIY 2.5 exhaust. It made 333bhp at PS with the flatest torque (curve) line I have seen (BRD map). Then I changed it for a TD05 to sort some surge I was experiencing with the large Samco intake pipe that the VF reacted with. The TD05 seems to have just as much 'go' but the lag I am experiencing is unbearable and it doesn't feel as fast in traffic conditions. I also had problems on track with hairpins etc. I would like to RR it before I take it to the next stage just for comparison.

With hindsight I would have stuck with the VF35 as the surge wasn't a problem for me or the turbo - it just sounded wierd and kinda cool!

I considered the VF30 and 34 but they weren't readily available, or cheap and the RR figures I saw for cars that had them didn't justify the effort at all.

F

Neanderthal

iTrader: (6)

Not 'too' bad then. Wouldn't need the decat from the list so if you remove that from the price (hoping you charge £3k for the exhaust ) I might get this done next year

finchyboy

Hi Floyd what does the surging sound like ?

ninjaguppy

if my02 sti is putting out 334/320 on a remap and decat what turbo and ancillaries would be good for me? Ideally id like a quicker spool up and 360/340!! Is that easy?

Floyd

iTrader: (9)

IIRC, part throttle and under load you will get a chuffing noise, which I gather is too much air being being forced into the engine than it can consume/needs. This air then forces its way back through the turbo and creates the noise. If the turbo is weak then I guess the shock loads that this reversal creates may 'upset' it...

It didn't do it under light load or full throttle (mostly).

F

New_scooby_04

iTrader: (4)

I'd be interested in your comments regarding the Td04 vs the VF35 mate. After I'd got my VF35 conversion done and commented that I thought it was a better set up all around then the TD04, low rev performance included, some said that I would have benefitted from significantly better low down response with a TD04H without significant compromise to the mid range/top end power. What's your experience of the two?

Regards,

Ns04

Butty

iTrader: (2)

Here's a comparision between a VF35 at 1.5 bar and a TD04 in PPP guise.


Outputs are in Delta Dash power at wheels, so the PPP is 265hp and the VF35 is 350 hp.
The TD04 torque appears better below 2700 rpm, but I had also a TGVless manifold with the VF35 which influenced its low down torque loss.

This loss is more than made up for the 3500-4500 rpm performance and the waye that power hangs on to the end.

Nick

EddScott

At point roughly does your VF35 spool up? Compared to the TD04 (2500???)

harvey

iTrader: (48)

I think a VF28 and 29 are very similar to answer a previous question and with the right mods, the VF28 can easily achive 350 plus BHP on an STi6 Wagon with all supporting mods.
An average TD05-06 20G should do an easy 380 bhp.
Comparably, an 05-06 18G is around 360 bhp. Spool on both is very similar with the smaller turbo only a smidgen ahead on spool which is contrary to what I expected but this has been proven on several different cars now.
One of my own built TD05-06 20Gs on my 95 WRX Wagon does 420 bhp and there may be a little more to come but that is an exception.

jasonius

iTrader: (1)

What you have to remember about Andys tests were that they were done at low RPM in 3rd (ie ~30 mph iirc). If the tests were done with the car in say 2nd then the results would have been different..

I have to agree that a well mapped/supported VF35 is an excellent combo, however I would like to see a real world comparison against a TD04h.

BTW my VF35 (with similar mods to Andys Project WRX) recently produced 348X333 via DD and by my crude measures is around 1.5 to 2 seconds quicker 60-100 that the mapped TD04 it replaced.. (30-70 is ~0.5 to 1 sec quicker.)

Floyd: didn't realise you previously run a TD04h..

Varboy

the VF35 sounds very interesting.

I currently have a VF24 which to me doesn't spool up as well as I would like it.

Would I get a worthwhile benefit with a VF35?

New_scooby_04

iTrader: (4)

Have a look at this thread mate, particularly the graph.

https://www.scoobynet.com/scoobynet-...xperience.html

NS04

Floyd

iTrader: (9)

350bhp on a VF28 wasn't something I regularly found on the web. Harvey may be able to achieve this easily in his excellent set-ups but when I did my research, I found reports and RR print outs to suggest that the VF28 was a regular 290-320 BHP turbo with supporting mods. The VF35 I found to be regularly in the 310-340BHP range with exceptions either side. The TD05 16g converstions have been anything from 250-350BHP with people reporting good spool that is slightly behing a TD04!!! I did just a swap of the VF35 to a TD05 and found out the difference for myself in the 'real world'.

As for the TD04h, I did have one but I didn't fit it! It was off JB's car and he had experimented extensively with it, as can be searched on SN. I intended to fit it before the VF35 but the VF came up at a good price unexpectedly and my plans changed.

To measure spool, UK 5 speed box, 4th gear flat road, steady 1800rpm with no boost and then floor it. Look at the revs when your boost gauge reads 1bar (you need to be quick!).

F

Andy.F

You may have seen this TD04h curve on the other thread, its the width of the torque curve that makes it so pleasant to drive, the gearbox almost becomes redundant


One thing I have learned about the Impreza however is that what works well on one, doesn't always produce the same results on another. Up until today I would always have chosen a TD05-16G over a VF35for torque and maximum power........then we go and get a stunning result on a VF35 on an Sti9, if I hadn't seen it first hand I would never have believed it. I wont even quote the figure as it will just get shot down

Andy

Gear Head

iTrader: (2)

Oh go on!

cookstar

iTrader: (6)

Go on.

Floyd

iTrader: (9)

Andy, I can't see your picture, just a red cross.
See this https://www.scoobynet.com/4626941-post231.html for my torque 'plateau' with the VF35.

My power was at low boost with the VF35. I had to run 1.4+ to do the same on the TD05 16g. Perhaps you are right Andy and maybe my car just didn't like the TD05. But the comparison is as good as you'll get because the only significant thing that was changed was the turbo (I also added an SX reg).

I had room to up the TD boost further on the 440's and I'm sure the turbo could produce even more power, especially with bigger injectors but it wouldn't have responded any better. This is important to me.

F

Andy.F

Floyd, your torque looked very impressive until I realised was in nm, not lbft. At approx 275lbft it is lower and later arriving than the TD04 above which holds over 300lbft from 3000 - 5500 rpm

note - Even though I just have I don't recommend comparing results on different RR's....slap on wrist to me !