Jump to content
SAU Community

Recommended Posts

Hi All,

Going to be putting a front mount in the stagea some time this week :thumbsup: Just wondering if the boost pressure will change at all after installing a frount mount? As I dont have a gauge or anything to check with. Im running stock boost but will be getting a electronic boost controller in the next few weeks :( thinking of a Greddy Profec B spec 2. By the way car is stock, so will be going from the side mounted cooler to a frount mount.

thanks in advance,

chris

i was running 7ish psi with just a 3" cat back and pod.

once i put a 3" stainless steel dump/frontpipe and 3" hi flow cat, boost went to around 8.5psi

then front mount shifted boost to around 9.5psi (maybe a wee bit more )

I would suspect no change on a stock level car.

The factory cooler really isnt "that" bad of a restriction in the factory setting.

Obviously more boost, larger turbo etc then there are benefits there :thumbsup:

Best way to check is to do a before and after dyno.

I never did on my R33, but after a full 3" split dump, decat and HKS catback, and R34 side mount, the dyno boost reading was showing 11.2psi on stock solenoid. No bleed valves or anything.

Will be doing FMIC when i get back from the states so would be interesting to see if i get an increase too.

Suck it up, dyno before and after and let us all know :thumbsup:

Guys, please forgive my ignorance, but i don't get why boost increases. Logically speaking, if you increase the volume (by using a larger intercooler), shouldn't pressure go down? Please enlighten me :thumbsup:

front mount tends to have better flow capacity (as in flow rate) than stock one so you get less pressure drop across the core.

that's why you see more boost at the plenum.

increase in volume may give more lag, depends on flow capacity.

i agree as above..

and lag can also be created by the length of intercooler piping..

wrx seem to get more lag wen fitting a large fmic...

skylines dont get this problem..and if u think u are getting lag, its becoz u need more boost!! :banana:

Ok, i think i understand now :). So the volume increase, in a closed system, would lower the pressure - but the increased rate of flow actually compensates for that increased volume to the point where across the system, the total pressure of air going to the engine increases...

So, how is the flow rate measured, i assume cfm or something. Anyone know what the standard intercooler (on an R33) flow rate is?

Mmm not sure that's how I would put it.

I'd like to think the flow rate increases with larger cross sectional area in intercooler pipes and/or core - whichever is the smallest and lag increases with the total volume of the entire intake system, post turbo.

this is probably overly simplified and the construction of the pipe/bends and core would have substantial influence over it.

of course there would be frictional pressure drop along the length of I/C pipes and the cooler itself.

so, I'd would say a system with a cooler with shorter length across end tanks and shortest possible piping would be best for flow for a given cooler core area and I/C pipe diameter.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • No-one in Aus/NZ would pay that much, because they remember when a turbo Skyline/Silvia was a cheap but awesome alternative to the mediocre shit sold here locally at the time. I'm sure over in USA there are enough trust fund kids who will have their R34 GTR, whatever the cost
    • I am stuck with enthusiast and very unhappy, even though Lumley, Shannons and Famous are all options, they all require a lock up garage, and my situation (basically a walled off compound from the street) is insufficient because the car is under a carport. I'm confident to resolve the situation I need to build a roller door with fascia in-front of my roller gate which is a solid opaque metal rolling gate. In any other universe moving the roller door 2 meters in-front of the garage door would still constitute the same amount of security but oh no. My insurance rates suck to the point of when I joined a market research for Enthusiast they were all surprised that I paid about 2-3x what other people were paying with Enthusiast when I asked them why their rates were so high. If I lie about having a garage, I save like $10 a month with enthusiast. (It's about $2600 p.a for 5000km of driving for a very unsustainable agreed value). Lumley has terrible reviews but @Duncan made me consider calling them when renew time came up - but their horrible reviews plus Christmas time made me... forget.
    • Not far. If all you want to do is know that they will reciprocate and move oil around a tiny bit, then a metre or so is all you need. Half metre fore and aft is enough.
    • That's the spirit!
    • It's fine. Basically if it has seized (eg due to moisture/rust in the bores) it will either break free on the starter or it won't turn....then you'll know it is freed up If it turns and doesn't start (reasonably likely) you will need to troubleshoot but most likely issue is a seized injector from moisture; same if it starts but missfires. Anything else could have happened (eg mice nibbling electricals) but the only way to find out is to close your eyes and hit the key I'd also change the fuel filter again after a few minutes of running as it may catch a heap of crap on first start
×
×
  • Create New...