Sub-Subaru

I've been looking at the Andy Forrest performance page to get an idea of what I want to do to my 2004 WRX Impreza and what it is going to cost. I basically either want to go for Level 1 or Level 2 package.

The big step up from level 1 to 2 seems to be the AFP 04-H custom ported hybrid turbo and bigger injectors. It seems that the additional items are going to cost an additional £700ish.

I just wanted to find out from people who have gone for this turbo and effective level of tuning whether you thought it was worth the extra money as opposed to leaving the standard turbo on?

Sub-Subaru

Wow just been reading about VF34 and VF35 and TD05 and really confused. Can anyone recommend the sort of turbo I should be looking at. I am running stock gearbox and not going to be doing much other mods. I just want something quick which can be used as a daily driver so I'm guessing around the 300bhp mark.

the shreksta

iTrader: (20)

Try and get a vf35 along with a decent fuel pump/pink sti injectors and a sti intercooler. Will make between 320 and 350 bhp and the vf35 spools good aswell.decat the up-pipe with a Sti one aswell.

ClassicEddie

Andy forest doesn't do his turbos anymore. Spoke with him last week and his supplier has gone out of business. Shame but your only option is a secondhand AFP04 (you'll be lucky!) or vf35 is probably your best bet

Sub-Subaru

Thanks for the replies. Please can I ask you guys some more questions as I'm trying to get my head around all this. What cars did the VF35 come on? What is the difference between a TD04 and VF35? Is it a good idea to get one secondhand or is that not really worth the risk?

I am going to be looking at doing the exhaust as well. I currently have a stock exhaust except for a Prodrive back box. I want to keep it all legal so from what I gather I need a sports cat downpipe, and then decat upipe to turbo and then straight through centre section?

RS_Matt

I've had a TD04 running 260bhp and a TD05 running 310bhp and they recorded the same 1/4 times. The TD05 is a little more effective if I launch at 5k to eliminate lag.

I found the TD04 (which can hit 280-300 with good supporting mods) could live with anything up to 70mph but the TD05 really came into it's own in 3rd gear onwards. I struggle to live with Clios around town now as the TD05 is pretty laggy.

I think the VF35 will be the best choice of the 3 popular options though it's said that it isn't quite as strong as the TD's.

JGlanzaV

iTrader: (3)

You struggle against Clios?

Maybe the turbo is not the issue here?!?!

RS_Matt

Basically both doing 15mph in 2nd, clio bolts, I floor it nothing happens. Basically I needed to get on power in 1st to carry revs over into 2nd - you know the score kids. When I had the TD04 it would have been game over for little Clio.

A recently fitted sports cat has helped, getting good boost by 4k now where before the car didn't feel lively until 5k.

JGlanzaV

iTrader: (3)

TBH, that is REALLY poor, I am getting full boost by 4.2k on a turbo twice the size of that.... really you should be in 1st that is why the clio is smoking you for a start....

Driving errors aside, Id say you have a problem if you arent getting full boost until 5k, I know people hwo have fitted td05s on a 1.3 starlet and getting full boost at less than 5k!

RS_Matt

I think someone told me once a TD05 can make 400 horses on an EVO. Different set-ups different effects.

I did have a leak on my warped Harvey Smith up-pipe that was sorted when the sports cat was fitted, so that probably exacerbated the lag.

JGlanzaV

iTrader: (3)

Either way, simple maths tells you a 1.3 engine can not flow more gas than a 2.0....

a TD05 20g maybe.... But tbh, wouldnt want one! better turbos out there that give far more driveability, as you are now finding out, should have stuck witht he TD04....

RS_Matt

I thought smaller engines were quicker to rev hence small twin turbos on bigger engines?

My dream now is to drive somebody's TD04 equipped WRX with 295-310 bhp. I bet it feels brutal in the early gears.

JGlanzaV

iTrader: (3)

Yeah, that makes no sense.....

You have no idea of brutal...!

Sub-Subaru

Can someone clarify for me the position with the TD04 and VF35. I basically am running a stock WRX. I am going to change the fuel pump, air filter, exhaust and maybe the plugs.

I posted a topic on here last year and was told that my standard TD04 will struggle to make 275bhp. I therefore thought it would be a good idea to change the turbo and then map it rather than map it with the standard turbo, be disappointed and then fit the turbo and pay to have it mapped again.

I want to make minimum 275 but closer to 300 would be good.

What would people suggest I do?

yabbadoo4

iTrader: (8)

your first idea is probably your best bet bud. an afp hybrid td04 will make 300 bhp and be a very quick spooling turbo with instant pull from low down and wont run out of puff higher up the power band. the vf35 is a good turbo and can make between 320-360 on a good day, but you would need sti pinks and a fmic would be a good idea and of course it will need mapped.

yabbadoo4

iTrader: (8)

there are 2 andy f hybrids for sale on here atm as well.

RS_Matt

Brutal compared to a 225bhp WRX.

RS_Matt

TDO4 will make 300 and has done more, but you'll need a lot of relevant supporting mods to do it. Full decat etc.

It will be on it's edge of efficiency at that power I suspect and could start blowing hot air after just a few pulls. TDO4 tails off at higher revs too which makes it pretty feeble in the higher gears.

Deffo a circa £80 TD05 or £250 VF35 if you are looking for more than something that's just very quick off the mark.

Sub-Subaru

It is quite difficult trying to learn about all this. Would a VF35 spool as quick as a TD04 or TD04 hybrid. I don't mind paying a bit more for a turbo now rather than finding out I want one after mapping.

I don't want to do a full decat because I can't risk any legal issues with it. I will be fitting a sports cat though, fuel pump and would be prepared to go for pink injectors and plugs if necessary. I don't know anything about intercoolers or the cost or difficulty involved in that.

At the moment sometimes my turbo spools up with a good bit of boost and I'm impressed but other times I'm overtaking or something and there is little power there and I'm surprised.

the shreksta

iTrader: (20)

this is my wrx with a vf35 and rcm headers/up-pipe etc

spooled nice and early and with 365ftLbs it pulled hard thru the mid-range too