Hey just got my BNR stage 3 and currently have a stock turbo on the car. The car is modded with a cosmo fuel pump and an hks f-con for fuel. has intake exhaust, blah blah the regular stuff too. Just don't have my 720cc injectors yet (still need to find some cheap enough, or maybe the 680cc form a gsl-se or w/e they are called) The current turbo will creep to 15 psi, so I haven't floored it in a good while (I really want to ) This BNR stage 3 has a ported wastegate and all that good stuff The wastegate rod thing has 12 psi written on it so I'll assume that limits the minimum peak boost to 12 psi? It looks adjustable though..Anyways I'm going auto crossing this weekend (Saturday, see norcal section) Think I would be safe to put the Stage 3 on the car before then? With the current turbo I'm afraid to floor it because it has bearing play and I don't want the boost creep to end up maxing out the injectors....or w/e you call it when the engine doesn't get enough fuel for higher boost and the engine goes pop (thats bad ...) Oh I have an HKS EVC ..or boost controller as I call it..will that be able to lower the boost to 10 psi?...eh just want to know if I should put the turbo on before autocross

 

Boost controllers cant lower boost, only bring it up and or ( if electronic ) control the gain ( when the wastegate opens )

I wouldnt put on the turbo just yet, invest in a nice set of 720's for sure.

 

Put it on..

 

mixed responses....>< My only concern is that the stock turbo will creep to 15psi wich is dangerous with the stock injectors. The stage 3 has a ported wastegate so I should be able to keep boost down a bit I think (12psi like the thing has writtten on it?), but someone mentioned that the bigger turbo pushes more cfm and maybe be even worse for my car.

 

I say put it on. Just be careful. Watch your boost levels and control your throttle.

 

if i get the chance then it's going on I guess since I never floor it now nothing will change when I don't floor it with the upgrade. Is 12 psi too much for the 550cc? Cuz if it is controlled to 12 psi Im going to floor it a bit more

 

well think of it like this 12psi on a bigger turbo is flowing more CFMs than 12psi on smaller turbo.

 

yeah I was taking that into consideration, but I dunno how to calculate it: which is harder on the injectors, big turbo @ lower psi or smaller turbo at higher psi, since they have different cfm rates.

 

I built a motor for a friend of mine about a year ago that is running at 19.6 psi with stock turbo, stock injectors, stock fuel pump, ported wastegate, street ported (intake & exhaust), ported exhaust manifold (removed twin scrolling) with factory 2mm 3 piece apex seals. So far it has been running this way with no problems! It is a daily driver but I can assure you he doesn’t abuse it at 19.6 psi every day. He defiantly needs to buy an external wastegate to minimize boost creep and that way the boost controller can be utilized for what it was bought for.

 

with those mods, you shouldn't even run 550cc's as it is on a stock turbo at 12psi.

Sure you can, but it's a risk. I wouldn't put the turbo on until u get some 720+cc injectors.

 

just buy some injectors and you won't have a problem

 

you could probley run some 820's and run 1 bar with a EBC and port the wastegate

 

haha I wish i could keep the stock turbo down at 7psi but it creeps like hell. I can be light on the gas at the auto cross...not tryin to set a record or ne thing :P just waitin for a reply that knows whether the stock turbo creeping to 15 psi or the upgraded that shouldnt go higher than 12 psi is harder on the injectors. trying to pick the lesser of the two evils haha

-edit: yeah I AM buying injectors, but its pointless until my standalone comes in Then I will run 720cc or maybe 890cc and boost 1 bar sometimes. But for this weekend I cant use anything but stockers =/

 

hmmm responses died, so tomorrow the turbo should be getting thrown on...maybe even today

 

the gsl se has 680s?

 

don't put the turbo on until you change the injectors....that way you know for sure that you're gonna get enough fuel....

 

two of them!

 

yeah man, i have no experience with BNR turbos yet so if you can't limit it to 10 PSI or less i would really be a bit leary of putting it on just yet.

 

How long was the turn-around on the turbo?

 

he bought it off a forum member, another local to me (cosmoTT) sent his off to BNR and i think the turnaround for his stage 4 is 3 weeks.

 

Personally, I wouldnt run that upgraded turbo above 8 PSI with your setup, just keep it off the car until you buy injectors and upgrade the fuel pump at a minimum. At least this way you'll be gettig more uncontrolled fuel, the standalone will just be a bonus when you get it. Do it right once, or do it cheaply 5 times. Contact BNR if you're considering throwing it on with stock parts..

 

And you, you're a moron to allow your friend to boost the stock turbo to 19.6 PSI, it's out of it's efficiency range and is a ticking time bomb. All its doing is flowing hot air, and its even worse without an upgraded fuel system. Tell him to port his wastegate..

 

yeah you will need larger injectors also the 12psi I believe is what it is set at. the wastegate actuator arm can be adgusted (sp) so that the pre load on the wastegate spring is tighter thus making the boost increas as well as spool time.

 

Ahhh I'll wait.. I already have the cosmo fuel pump..just waitin for some cash to order my damn injectors....then everything will be perfect...except when I have to wait even longer to get cash for the stupid fmic. Either way I guess at the auto cross I'll have to be gentle on the throttle thatsucks for someone like me with a heavy *** right foot.)

 

yea its best you don't put on the turbo i have a 89 t2 and i dont go over 12psi since i dont have fuel upgrades with that turbo you would definitly need bigger injectors and i would think you would need a FMIC also before you put a bigger turbo on