Another Power Fc Question

[linxus40]

right now my car hits full boost at about 5.5K which is very annoying on a rb20, this is using a retuned stock ecu. would it be possible to make it boost faster by changing the maps with a pfc. if so how much quicker is posible? 4K 3K....

[t_revz]

right now my car hits full boost at about 5.5K which is very annoying on a rb20, this is using a retuned stock ecu.  would it be possible to make it boost faster by changing the maps with a pfc.  if so how much quicker is posible? 4K 3K....

<{POST_SNAPBACK}>

how high is the boost set? electronic boost contollers are the way to go.

[benl1981]

Maybe if you get an electronic boost controller or a pressure relief valve to eliminate wategate creep. The ECU isn't going to help much. Maybe a bigger dump pipe will help (if you have standard now). Maybe you need a more responsive turbo.. An rb25 turbo or HKS one I would think would hit 9-10 pis by about 3500rpm. Depends what gear your in I guess

Edited November 13, 2005 by benl1981

[carl h]

is this a std rb20?

if so you should have almost if not full boost by 3k.......

whats the setup, that will help the guess work along.

[Nathan_G1]

What turbo are you running? if its hitting full boost around 5.5k sounds like a trust turbo or big garrett....

[R31Nismoid]

how high is the boost set? electronic boost contollers are the way to go.

hardly. very much over-rated

I've never used one on any of my setups.

anyhow, simply changing ECU is not going to make your turbo spool 1500rpm earlier.

Thats dreaming. Unless you have a weak actuator or something mechanically related then you've pretty much got what everone elese with an RB20 has.

[Spook's_Skyline]

my rb25 hits full boost at about 3000rpm with the standard turbo

moves along quite nicely

[paulr33]

post a list of your mods so we can diag a little easier what the problem / reason may be

[linxus40]

ok a quick list of mods first

3" full exhaust including dump, 15psi, hybrid ebc, fmic, turbo was on car when imported but it looks big and has an external wastegate, rebic computer controlling 2 extra injectors in the manifold, remaped ecu with the car dynoed at 196rwkw before fmic as installed.

if not the ecu what would be the best option without spending an arm and a leg for faster spool up.

ps i dont want to change the turbo.

[paulr33]

well the first cuplrit unfortunately will be the turbocharger. the stocker turbo on the rb20 doesnt exactly come on at like 2000rpm, more so like 4000rpm so changing to a bigger one, especially an external wastegated unit is only going to amplify the lag factor.

do you know what size/mode/unit the turbocharger is? if you do its not going to help but at least you will know some more about it. perhas you could sell or swap it with someone who has an rb25 hiflow instead. that should come on quicker and give similar power output. does it have any markings or numbers/model info placard on the housing?

[paulr33]

sorry this is not to be confused that an external gate turbo makes more lag, its just usually external gate turbo's are 500hp plus. so a t04, gt30, td06 etc so they are big suckers and will be laggy as all hell. even similar turbo on an rb25 is fairly laggy compared to the stocker unit

[linxus40]

ive had a few people say it looks like a t03 or a t04 but it has no visable markings that would make it identifyable.

[paulr33]

even if you do know what model / combo it probably doesn't help you much other than you know what model it is. i dont see there is a great deal you can do to fix? cams etc may help bring it on a little but certainly not the the amount you expect, aka 4000rpm ish ?