hhh1234

iTrader: (17)

alrigth guys i thinking uf upgrading turbos on my 99 rb5. just wanting to know whats what. as there are to many td, vf, and so on. i dont want silly power prob looking to get 300 - 340 bhp. ive currently got full exhaust induction kit and ecutek remap. ive been offered a vf34

DJ_Jon

iTrader: (7)

I've got a VF28, but VF34/35/22/23 will all fit & do the job, it just depends on what driving characteristics you want.

New_scooby_04

iTrader: (4)

How much are you being asked to pay for the 34?

Just that the VF35 can often be had for considerably cheaper, it's a quicker spooling turbo, but doesn't quite have as much at the top end (we're only talking in the region 10-15 bhp though.

I have one on mine and it produces 320bhp with sub optimal cooling, when the FMIC is on there, should be around 340.

Great little turbo!

Ns04

Tidgy

dont think thats quite right mate, the vf34 compensates for the slower spool due to larger exhust housing by being roller bearing.

spool rate wise theres nothing between the two, the reason the vf35 tends to be preferd over the vf34 is the cost

hhh1234

iTrader: (17)

hes looking around 350 its only done 100miles and virtually new. is the 34 slow at spooling up compaired to standard turbo then.

jd5217

buy it!

Tidgy

its slower compared to the td04 cos its a bigger more capable turbo, but not by huge amounts

and £350 for genuin vf34 thast done 100 miles then bite his arm off

New_scooby_04

iTrader: (4)

Yes it is, but IIRC Andy F listed turbos in order of speed of response and it was Td04, VF35, VF34, Td05 etc.... Probably not much in it between the two turbos in either response of top end TBH. Both can get to 340-350 with the right supporting mods (although the 34 seems to do it more often) both will spool well.

If I understand it correctly the benefits of roller bearing turbos only start to get really appreciable when you start talking BIG turbos

Would be interesting to get an objective comparison from the mappers, if that's possible.

Ns04

New_scooby_04

iTrader: (4)

Yep, I'd say so too....though I'm a bit dubious about whether its genuine TBH

jd5217

why only 100 miles?

OLLIeRB5

spotted this vf34 myself jonny, but the budget wouldnt stretch.

just bought myself a vf23 this morning.. once again blowing my budget wide wide open for the 2nd time this week

sadly i`ve still a remap to get which yours already has

hhh1234

iTrader: (17)

dont know why its only got 100 miles on here. he got it new for 550 if thats sounda about right. so would it be a gd upgrade what should you look for on turbos to know its in gd nick

Tidgy

£550 is agoing rate, i paid £750 ish, but that included fitting.

so its prob not far off the mark at £350

andythejock01wrx

Don't think that's true - have seen mappers on here in the past say that the VF34 has a little more power, the VF35 a little lower spool. True that there's not a huge difference though.

Tidgy

duno, when i bought mine was told what i just said, as you say i don't think theres much in it at all tbh.

think mine and ns04's spool more or less at same point

ditchmyster

iTrader: (7)

iv'e got a vf34 no fmic and currently running 321bhp every one iv'e spoken to says it's the best turbo in it's class and thats because it ball bearing which means it spools faster and is considered to be better quality and in theory more robust. now im no expert and it was already on the car when i bougth it! i was also told that i could get £400 for it all day long! so £350 is a good price providing it's a genuine one..

Tidgy

mines running 340bhp and sppoling to 1 bar at roughly 3300, then full boost by 3600

New_scooby_04

iTrader: (4)

It's give and take mate. Ball bearing helps spool, but it has a bigger exhaust housing than the 35 which has a tiny p15 one. Couldn't tell you about the quality, but I'm about to remove the dump valve on mine, so if it throws a compressor blade soon after I'll consider myself wiser............................................a nd get a Td05 18G

Ns04

Unfortunately, I don't have the boost plot against rpm for my car, so can't offer data for comparison. Sorry! I'll ask Bob for the data when I get the car remapped by him next week. I can tell you that at 2500rpm in 4th it goes and at around 3000 rpm it really goes!!! In terms of response it feels like the std unmapped Td04

I stand to be corrected here, but I seem to recall from my last mapping session, 1 bar was about 2800 rpm, but I was concentrating on the road!

Tidgy

lol

jasonius

iTrader: (1)

4th gear with fully warmed exhaust/turbo my VF35 hits 1bar @2800-2900 and 1.5 by 3300-3400..

My TD04 used to make 1bar @ 2700 and peak 1.5bar @ 3200 by comparison.

Saying that, yours might not have been making it's best boost profile on the dyno, most don't..! Have you compared it to boost/rpm on the road..?

Tidgy

no mate, seems to come onto full boost (on the defi), bt lower down than shown on the graph.

hhh1234

iTrader: (17)

So if i get a vf 34 is it just a bolt on mod or will things need to be changed like injectors.

New_scooby_04

iTrader: (4)

Getting the turbo by itself will do you no good. You need supporting mods.

Minimum I would suggest is:

Decat/sports cat exhaust (must have)
Uprated fuel pump (must have)
Ported and wrapped headers (good idea for better spool and more power)
Uprated turbo hoses (good idea, std ones can split under increased boost)
Revert to std airbox and Uprated panel filter (Good idea)
3 port boost soleniod (Not always necessary, but figure on needing it)
Turbo...well, duh
and a remap (must have)

It's what I did and got 319bhp and 316ft lbs torque measured on deltadash on a day with 30 degees ambient temp. Read about my conversion here:

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

At this point you'll be knocking around the limit of your injectors and cooling.

Ns04

hhh1234

iTrader: (17)

well like ive said at start ive got remap, full exhaust and induction kit. so really its uprated fuel pump,& TURBO. i gather id would be a gd idea to get the map tweaked again once mods fitted.

Tidgy

the turbo will prob make it a whole new map iirc

mike799

[QUOTE=New_scooby_04

Minimum I would suggest is:

Decat/sports cat exhaust (must have)
Uprated fuel pump (must have)
Ported and wrapped headers (good idea for better spool and more power)
Uprated turbo hoses (good idea, std ones can split under increased boost)
Revert to std airbox and Uprated panel filter (Good idea)
3 port boost soleniod (Not always necessary, but figure on needing it)
Turbo...well, duh
and a remap (must have)

It's what I did and got 319bhp and 316ft lbs torque measured on deltadash on a day with 30 degees ambient temp. Read about my conversion here:

Ns04[/QUOTE]

ns04
great readup on your upgrade,very similar to my setup,what boost are you running on those figures.

thanks mike

New_scooby_04

iTrader: (4)

Mike IIRC from Bob 1.35 peak, 1.3 hold and 1.25 right at the top end.

Will be getting an FMIC, bigger injectors and an AVCR fitted and mapped next week.

BTW to the OP, yep, new turbo means map tweak, deffo!

jasonius

iTrader: (1)

Actually re-tested my VF35 today and according to my Defi's it hit's 1bar @2900 and peaks +1.5bar @3100..!

This is 4th (5sp) with hot turbo/exh system. This is the first time I've checked it since fitting a turbo blanket last year, so explains the improvement..