drakesnow

Might be a silly question but just an intriguing topic for me. Regarding a standard recirc valve on my classic v4 type r....I'm currently mapped mafless esl and running a front mount if that helps.

Is there an actual point where the standard recirc is no longer any good?

Is that dependent on boost or any other fators in your map/tune? (I am looking for at slightly bigger turbo/more boost etc)

Is there a point where you need to run a vent to atmosphere dump valve setup or a "dv delete" and get rid of it all together?

I thought this could be for reasons of spring strength or maybe possible turbo damage via compressor surge- or even something in overall efficiency of the system.

I had heard you could maybe even just turn the standard recirc around and that this was good up to 2 bar of boost?

alcazar

iTrader: (2)

Mine runs a Forge recirc valve, recommended by my mapper.

drakesnow

Good info but need to know what i can get away with on my standard one as getting mapped tuesday!!

drakesnow

Bump would really like some thoughts on this

gc8-r

iTrader: (21)

What power are you after....
As standard one must be good for 350....
And as above if you want to change fit a forge etc
And get a hard spring fitted...

mickywrx

iTrader: (29)

Buy new though.... unlike me.

gc8-r

iTrader: (21)

Ya definitely buy new... unlike our micky... lol

CREWJ

It will come down to pressure more than power. You can get good power without upping the boost pressure.

alcazar

iTrader: (2)

I'd not go above 1.3 bar.
But don't go above 1.5 bar on stock headbolts.

drakesnow

Yeah I agree crew j , I am currently running 342 @ 1.4 bar of boost on the vf24 and it runs excellent.

One source suggested up to 1.5 bar on the standard part...so your thoughts Alcazar would seem correct.

I'd probably not look to run more than 1.5 bar on Tuesday on what is basically a hybrid 20g- the ST420 turbo.

Might just be able to get away with it then!

drakesnow

Oh and --Targeting 400 bhp on vpower only gc8-r!

gc8-r

iTrader: (21)

For piece of mind I'd just change it for a good.....
And I mean good re circ valve a forge or equivalent...
Cheap ones are cheap for a reason.. there ****..!!!!

And don't go for crazy boost.. let the engine do some of the work first at least then you will get a good kick about 3-4k
Mine runs 1.5 bar and is a bit quick to spool and runs out of steam quick..
Maybe as said 1.0-1.2 unless you want mental 0-60 speed

gc8-r

iTrader: (21)

P.s
Type-r,s love the little vf24 with good boost
Take it to 330-350 hp and see how you get on....
Then change a few ratios on g.box or go six speed.

RoyPinhey

Wind a vf28 up and get 350ish with next to no lag

drakesnow

Hay all,

I appreciate all the advice- after having spoken with Dunacan Graham (my mapper) he advised just bung both pipes and away we went. Apparently if I am mapped this way its just fine. Certainly some of the older vf series and stuff he said can't take it but he said with my current setup it will not cause any long term damage.

We ran my car at SRR at about 1.5 bar for a conservative tune. 385 bhp on the st420 turbo I swapped on. And that was done with my diff clicked up most of the way (it was suggested this is the best way to dyno the DCCD type r's??) I think with the diff all the way back and open it makes slightly more power even so. Plus my tyres were under inflated a bit at the time lol!

Having had the chance to finally test it last night the thing is a real animal on the road now, feels nearer 400!

Indeed as you say I had been previously running the vf24 and it was just fantastic making 341 bhp @ at just shy of 1.4 bar.

But this new turbo (which is based off a 20g, got it from a pal) just pulls and pulls. Really well mapped and just doesn't seem to run out whatsoever and pretty good spool as well to be honest. And the "DV delete"setup just sounds insane!