Which turbo

[gavo]

Am gonna be rebuilding me engine this week and now have 2 turbo's 1 td05 and a td04 am i right in thinking that the td05 would be the best 1 to stick back on??

[bob]

Am gonna be rebuilding me engine this week and now have 2 turbo's 1 td05 and a td04 am i right in thinking that the td05 would be the best 1 to stick back on??

I would...:wink:
See

http://www.andyforrestperformance.co.uk/16307.html

[gavo]

cheers Bob will have a good read.

[scoobyDAZZA]

td05 for more power but a bit of lag
td04 less power but no lag

i'd go with the 05 tbh

[Agent Smith]

AndyF TD05/20G :love0030:

[Agent Smith]

hows it goin Gav??

[Olly P]

If you don't want much more than 280bhp the TD04 will be less laggy than the TD05. If you want more than that the 04 won't manage it.
The TD05/20g is a hybrid and personally I think its too laggy for a 2 litre.
The VF series of turbo's are roller bearing so have good spool up but can still produce high figures (depending on which one you get.) Best of both worlds.

[Agent Smith]

i dont find the 20G too laggy, spools up nice and holds boost really well all the way to the redline.

http://stevef.myphotoalbum.com/view_photo.php?set_albumName=album12&id=WRC_385_jpg

[Olly P]

I think we need to clarify what "laggy" means.
Any gap between planting the throttle and getting the "thump" in the back, is lag.
All turbo charged cars suffer from it to some extent.
Tis a nice graph by the way and the 20g's ability to produce consistently high figures is not in question.
But would you not agree that a car which uses more than half the available revs to reach peak torque, is laggy?
I had a TD05 running 285bhp and I was getting nailed time and time again in convoy with similarly (and less) powered cars on TD04's.
My advice would be to use the smallest turbo possible which is capable of making the power you require.
What turbo and power figures did you have before the 20g? And has it made the car more of less driveable since putting the 20g on?
A friend of mine races in the Castle Combe saloon car championship and was advised to get the 18g variant as it was felt that the 20g would be too laggy (Pavlo, Zen perfromance)
How does everyone else gauge lag? Would be interesting to see peoples ideas on what they believe makes a car laggy or not.
I think it means different things to different people.

[Agent Smith]

previously running 351bhp on the VF35, but it ran out of steam.

will post previous graph in a moment.

http://stevef.myphotoalbum.com/view_photo.php?set_albumName=album12&id=WRC_351_dyno

previous level of tuning

[Neil G]

I think we need to clarify what "laggy" means.
Any gap between planting the throttle and getting the "thump" in the back, is lag.
All turbo charged cars suffer from it to some extent.
Tis a nice graph by the way and the 20g's ability to produce consistently high figures is not in question.
But would you not agree that a car which uses more than half the available revs to reach peak torque, is laggy?
I had a TD05 running 285bhp and I was getting nailed time and time again in convoy with similarly (and less) powered cars on TD04's.
My advice would be to use the smallest turbo possible which is capable of making the power you require.
What turbo and power figures did you have before the 20g? And has it made the car more of less driveable since putting the 20g on?
A friend of mine races in the Castle Combe saloon car championship and was advised to get the 18g variant as it was felt that the 20g would be too laggy (Pavlo, Zen perfromance)
How does everyone else gauge lag? Would be interesting to see peoples ideas on what they believe makes a car laggy or not.
I think it means different things to different people.

I have to agree with you Olly

I thought my old WRX with a TD05 was laggy and got outrun by TD04 cars in twisty sections of road..my car needed much more road/revs to get in it's stride.

It wasn't helped by a leaking exhaust system I'm sure but it was very gutless at low rpm

[bob]

I see your power is now coming in 600 rpm later with the 20g.. This will be the same as Olly and me.. his power comes in about 500 sooner. but mine hangs on to power that bit longer. Just a question of a bit of lag and more power. (20g) or less lag instant power but less top end.(TD04)
For just around town the TD04 will provide good instant power but when it comes to track or strip the 20g will be what you want as the revs do not ever go below the 4000 rpm.


I have to agree with you Olly

I thought my old WRX with a TD05 was laggy and got outrun by TD04 cars in twisty sections of road..my car needed much more road/revs to get in it's stride.

It wasn't helped by a leaking exhaust system I'm sure but it was very gutless at low rpm

To high a gear Neil....:smile: Larger turbo keep the rev's up.

[Agent Smith]

driving locally the car very rarely gets on power as only 35mph speed limit here :sad-smiley-046:

the joys of the 6speed gearbox bob

[Neil G]

Cheers for the tips Bob...bit late now:hysterical:

Never really felt the car was that driveable but, like I said the exhaust lekage may have had something to do with it.

I've now got 170-80 bhp to play with and no turbo....great:hysterical:

TBH i'm no great driver anyway so it's nice and easy

[scoobyDAZZA]

agree with olly on this 1

IMO a 280bhp with td04 would be quicker than a 300bhp with a td05,or at least feel quicker

i've been contemplating dropping my power from 348 ish to 325 by using a td04 hybrid , the 1 that andyF makes/sells . i've asked him of his thoughts,he says it will be slower 0-60 and quarter mile as i can easily keep the vf34 in the 'power band' but i'd hit full boost at 2600 rpm with the td04 hybrid instead of 3300 with the vf34 , also i want to lose the BOV which isn't recommended with a vf34 but i could with a td series turbo . so reckoning is the car would actually feel faster and would be quicker round haynes, with less 1st gear crunching
:lol:

[gavo]

Well think i may stick with the 05 thanks for all your input though,It's coming together Ed very slowly found that it had just cracked the edge of no4 piston has'nt damaged the bore which is good but have also found that 2 inlet valve springs on the opposite side need changing so hopefully will all be done by the weekend.:cool: :bananarock:

[Agent Smith]

sweet as mate,think i'm free most of the week...shout if you need any help.....

[gavo]

yeah will do if im up and running on saturday will give ya a bell and come over to exmouth.

[Agent Smith]

you'd best be!!!!...

[wrx r special]

I'm running about 340bhp on an IHI VF22 which is slightly bigger than your VF35 (don't know why they do their numbers backwards). My lag is no more than an STI with a TD04. Lag is more to do with the volume between the turbo and the butterfly. Large intercooler and big piping may give big power but the turbo has to fill it all before you get full boost. Also the uppipe can effect lag. With a big bore you may get better gas flow but the velocity is reduced and thus creates lag. There are a few more reasons but im driving in traffic so can't type much more. lol

[Olly P]

Do you have a Dyno graph?

[wrx r special]

Will get a proper one when I do my fiddling and fettling. I'm looking to get about 400bhp with this turbo and will. I'm sure it could give more but that would be pushing the underbonnet heat boundaries.
When you say the TD04 limits you to 280bhp its not the turbo that can't provide the boost, its the heat it creates! Lorries have smaller turbo's than mine producing up to 4 bar because they can have massive intercoolers and such like.