To Cam Or Not

[R TUNE]

Im a bit confused.

I get some people telling me thier is no real need to fitt after market cams on a turbo engine then other say thier is.

Just wont to know would i be better off just using adj cam gears to change the power band or should i go after market cam?

power aim is no more then 200rwkw as the car is a street car and mainly enters drift and motakana so response and low/midrange touqre is what i am after.

my current modds are

RB20DET

3" split dump pipe and front pipe

3" catback exhasut

45v2 turbo at 14psi (RB25DET series 2)

last dyno run was done at 5 psi (tunner did know how to set the boost controller(a bleed type)) so power was 146rwkw.

the one thing i have noticed is that it is laggy up till 4-4.5k and then it goes. the car does need a tune but would i beinifit from a set of cams in this situation.

[JnJ]

you will benefit from a set of cams but you'll need a tune, you can't just drop them in w/o having it tuned.

[zebra]

No gain to be had by fitting bigger cams with a standard turbo (or in your case a smidge bigger than standard).

Cam gears yes.

[want_33]

same dillema im in, im making about 340hp now but want to bump up to the 400ish mark, getting a fresh head made up for me now, changing to forward facing plenum, swapping my cam gears into the new head and looking at some 276 (or 272 cant remember) and with a tune im hopinh to make that extra 60hp

im making about 18psi by about 4-4.5 with a tdo6 25g so your setup sounds a bit laggy?

[R TUNE]

Should have mention i live in darwin were temps are generly 33deg, but yes the car does need a tune, and it is auto.

Ive included the dyno graph in its current state (ecepet PSI was at 5-6 when this was run and i have pumped it up to 14)

Edited October 27, 2010 by R TUNE

[zebra]

Save the money on cams and get a tune, much better $/HP ration there.

[R TUNE]

so cam gears and tune it is

[bubba]

That's rather abnormally laggy for a 25 turbo on a 20.. I had a series 1 25 turbo on my RB20 and that was making 12psi by 3500rpm..

[R TUNE]

Yea i know, i think the auto and the warm weather (and tune) are to blame.

as it feels alot more responsive when the tem is around 25 deg compared to 30 deg.

[ORIGIN]

Ive got Hks 272's im mine and there awsome best thing i ever did...

Mods are

KKR480 with 30mm gate

HKS 272 cams with cam gears (some china brand but they still do the job)

stock computer running 10 - 12psi

walbro fuel pump

cams definetly made this setup cracks the gate at 4500rpm, same setup on my brothers car without cams 5200rpm so they make a big difference and keeps making power all the way to 7500 and past it... (but not game enough on standard internals)

[bubba]

  R TUNE said:

Yea i know, i think the auto and the warm weather (and tune) are to blame.

as it feels alot more responsive when the tem is around 25 deg compared to 30 deg.

Sounds like you need a FMIC and a retune.

  ORIGIN said:

Ive got Hks 272's im mine and there awsome best thing i ever did...

Mods are

KKR480 with 30mm gate

HKS 272 cams with cam gears (some china brand but they still do the job)

stock computer running 10 - 12psi

walbro fuel pump

cams definetly made this setup cracks the gate at 4500rpm, same setup on my brothers car without cams 5200rpm so they make a big difference and keeps making power all the way to 7500 and past it... (but not game enough on standard internals)

Get a tune.

[ORIGIN]

bubba yes a tune is in the works i just need to get motivated, ive had my laptop hookup to it with nistune and it is running very well (safe) no detonation what so ever well thats according to the standard ecu anyway.... but it does need a tune just not badly :-p