Urgent Gcg Stage 1 Turbo Question

[silver gts-t]

  nF said:

this is a good read

got a gcg hi-flow rb25 turbo going on my r32 now

other mods include 550cc injectors and powerfc and the usual kinda shit

i'll watch this thread and post results when/if i get them

<{POST_SNAPBACK}>

our cars sound similar apart from PFC, would be good to see the differance

[nF]

its being tuned right now

should have results in a day or 2

[Waldo]

man my engine must be buggered or sumthin...i have a high flowed turbo (not a GCG) but loooks exactly like it, and im only making 245rwhp and thats with tomei cams and 14psi and power fc....anybody know wat could be my prob?can i have a buggered head gasket? or could it be the rings?

[predator]

wind it up the boost to 18psi or so.. it's probably the only way you'll get power out of it.. then it will be laggy and possibly kill an old engine. Sounds similar situation to my highflow rb25 (its running 16psi at the moment).. not the best match for rb20.

[grim32]

  Waldo said:

man my engine must be buggered or sumthin...i have a high flowed turbo (not a GCG) but loooks exactly like it, and im only making 245rwhp and thats with tomei cams and 14psi and power fc....anybody know wat could be my prob?can i have a buggered head gasket? or could it be the rings?

<{POST_SNAPBACK}>

i wish i had that, ive got 253hp@22psi. RB20 hybrid, exhaust housing too small. new turbo here i come.........

[nF]

18psi should be safe for most rb20s

it helps force the air in

your case is very odd waldo, cause tomei poncams i was looking at doing down the track

[Waldo]

yeah i still dont know wat it is, i have been checking all the vacuum lines for leaks, the only thing i havent checked is pluggin up the stock bov and putting big bolt clamps on the cooler piping

[silver gts-t]

my cars booked in for jan 9th, so we can compare more results

[nF]

ok i made 190rwkw at ~14psi which isn't *too* shabby to be honest

no boost controller

need a decent one to hold that can ~18psi

[silver gts-t]

  nF said:

ok i made 190rwkw at ~14psi which isn't *too* shabby to be honest

no boost controller

need a decent one to hold that can ~18psi

<{POST_SNAPBACK}>

post up a graph, and other mods..

[predator]

sounds similar to mine..

nf: I think you'll make maybe 20% more power with raising the boost another 4psi or so... so thats quite a good result if you ask me.

may as well post up my chart as a point of comparison.

16psi on highflow rb25 turbo (rb20 actuator), k&n panel filter, 3" exhaust right thru, highflow cat, hybrid cheap front mount 450x300x75, turbotech boost valve, SAFC.. So seeing as mine is AUTO, and non-powerfc seems about in range with nF above by taking 20-30% off.

I don't think there was any temperature correction put in for the 32 degree day.. non-shootout .. So allowing 10-15%.. mine is about 150rwkw on any other dyno (probably feels about 150rwkw too).

A fair bit of blowby at 16psi exhibited in my engine, whereas was none at 12psi... so any more isn't a good idea in mine at the moment.

[nF]

sorry don't have a scanner or camera here so i'll try describe

also graph doesn't have RPMs so someone might have to convert

in 3rd gear, peak power at 114km/h, made full boost by 82km

graph is a nice curve too

mods that are important:

- split dump

- splitfires

- iridium plugs

- k&n pod

- 3 inch full exhaust with a hi-flow cat (crowbar brand)

- the turbo is r33 gcg hiflow with i think the r32 actuator

- 550x100x76 intercooler