Rb25/vg30 Hi-flow Turbo: Results/comparison

[SECURITY]

wow. thats the second one that ive heard of to go in the same way. what a suprise. whos one is next, do you think?

[Turk]

Turk,

Most likely a dump pipe design issue.

yeah dont know man, been given all sorts of reasons like the flow is too good hence the spike

and was advised to add octane boost to stop pinging

could be cams

hasnt been a simple upgrade solution like i was informed in the begining, bolt off bolt on 50rwkw good story

I should have gone for the HKS GTRS option would have cost me roughly the same after havein all the problems with the highflow

[R33GOD]

R33GOD

Why limit yourself because of a faulty product?

Not saying that Slide turbos are bad/faulty, as i have had good experiences with Aaron (Slide). Sometimes shit happens and one or two go bad; i know i am in the technology trade. But when you get the replacement unit, don't hold back, it should be good to at least 16-18psi, if it fails then ask for a refund.

I know that my high-flow turbo ran out of puff at anything over 16psi (ie: the increase in rwkw did not justify the increase in boost). And with my level of head work, the turbo was limited to 270rwkw. On a std head, i would not expect to see over a genuine 250'ish rwkw.

i dont know why but i just get put off. i just dont want it to break again. being bush bearing and all.

i just cant afford having my car off the road again. so il drop the boost to keep it safer

[Al]

Just realised i started this thread in Nov '05.

Back then i stated; "Hopefully this set-up will last approx 12 months, then the bottom end will be treated to forgies....". It actually lasted 16 months and dropped compression in cyl #3 at a Calder Park track meet

Now i'm doing a whole lot more than just forgies .

Funny how your words come back to haunt you.

So i'll state: Hopefully the new setup will last 30 faultless, hassle free, years

[Sambo33]

what caused the engine to fail??

[Al]

Numerous track, motorkhana, drag and cruise days, 7yrs of hard driving. A fair bit of punishment and high temp/stress events.

Honestly; when the piston was removed we barely found the fault. 4 hairline cracks between the ring lands, that's it. No melting, detonation, missing bits, etc. Bores, bearings, rods, crank, etc were still in perfect condition and the head of the damaged piston was unmarked. So the conclusion was fatigue.

[Sambo33]

wow, thats not too bad!

mine did all 6 ringlands

[Sambo33]

here is my recent dyno, (keeping with the topic) ive just had a rb25 highflow with the vg30 exhaust housing, also a nismo fuel reg and z32 afm.

Edited November 14, 2007 by Sambo33

[Al]

wow, thats not too bad!

mine did all 6 ringlands

See that's were i am a little disappointed: i farked up an engine but have nothing to show for it, i have no bragging rights!

You stating "mine did ALL 6 ringlands" has a bit of cred; or better yet "kicked a leg out of bed".

I can't even fark up an engine properly . Funny thing is, on 5.5 cyl the car still felt strong, Driving home, after the race, i gave it a squirt in 2nd gear (to 100km/h) and thought all was good, and the oil out the filter was just massive blow-by. The next morning, when it took almost ten minutes and endless cranks to start, was my first indication something was wrong. Compression went something like: 158, 160, 83, 161,159,160. Yet when the power came on, i had no smoke and the car almost felt as strong as usual.

Barely justifies a $15K conversion/build

[Sambo33]

lol, i see your point, better to kill it good than something small requiring a rebuild. its fairly disheartening at the time, but in the end its good to know you now have an engine that can cope with the extra kw

it is funny too, when my compression was down the car still pulled hard and felt like nothing was wrong.. execpt for the oil cloud blocking my rear view and filling up my 1L catch can in one good 4th gear boost

Edited November 14, 2007 by Sambo33

[Tangles]

wow. thats the second one that ive heard of to go in the same way. what a suprise. whos one is next, do you think?

lol probably mine; its now officially been one year since I received it and installed it.

out of warranty FTL

but still, a warranty on a turbo is a good deal for sure

[MZTRBO]

Al i take it your not using another hi-flow with that 15k build..

What build route did you go?

Its still good to see that these little hi-flows last a while, Im acutally holding back on chucking on the gt30 because of the hi-flows potential..

Just a run down..I made 235rwkw on 10-12psi with exhaust,fmic,rb20 actuator and SAFC..thats about it without getting to technical.

[MZTRBO]

Tangles, what combo of hi-flow do you have..

And how has it been treated over the last year?

Cheers

[Al]

Al i take it your not using another hi-flow with that 15k build..

What build route did you go?

Its still good to see that these little hi-flows last a while, Im acutally holding back on chucking on the gt30 because of the hi-flows potential..

Just a run down..I made 235rwkw on 10-12psi with exhaust,fmic,rb20 actuator and SAFC..thats about it without getting to technical.

As mentioned earlier, i dumped sold the Hi-flow for a HKS GTRS, only to find (at a later date) that my exhaust was the main reason for the lag. But that hi-flow is now in a friend's R34 GTT, and it's still going strong, making 270rwkw@15psi.

The build is very extensive as it's being prep'ed for motorkhana and track work

The key parts:

- rb30det conversion (built to rev to 8000rpm)

- GReddy plenum

- Tuned length, high mount, ext manifold

- Garrett GT3076R (GT30R) [smallest turbo recommended for the engine]

The end result should be about 300-330rwkw@20psi, with better response than a hi-flow turbo

[Turk]

Cubes, any recomendations to a dump pipe

Turk,

Most likely a dump pipe design issue.

[MZTRBO]

Turk,

Is the dump pipe a split dump design...i.e . seperate pipe for wastegate.

I have a split dump design on the 33 with the hi-flow and it seems to work a treat. It plumbs back in at the bottom of the dump where it bends to go to the cat.

[MZTRBO]

As mentioned earlier, i dumped sold the Hi-flow for a HKS GTRS, only to find (at a later date) that my exhaust was the main reason for the lag. But that hi-flow is now in a friend's R34 GTT, and it's still going strong, making 270rwkw@15psi.

The build is very extensive as it's being prep'ed for motorkhana and track work

The key parts:

- rb30det conversion (built to rev to 8000rpm)

- GReddy plenum

- Tuned length, high mount, ext manifold

- Garrett GT3076R (GT30R) [smallest turbo recommended for the engine]

The end result should be about 300-330rwkw@20psi, with better response than a hi-flow turbo

yeh Al i did see that post earlier, its great to see the turbo still going strong and at a very respectiful power figure still.

Your build sounds awesome, good luck with traction. Though it sounds like the turbo will be very progressive and im sure you have concentrated on the suspension..so good luck with it all.

Cheers

[Al]

Suspension sorted

But still think there may be an issue with traction

Time will tell; if too tail happy, i have already started to consider the GT35R, with external gate.

[Turk]

thanks

Turk,

Is the dump pipe a split dump design...i.e . seperate pipe for wastegate.

I have a split dump design on the 33 with the hi-flow and it seems to work a treat. It plumbs back in at the bottom of the dump where it bends to go to the cat.

[Turk]

Turk,

Is the dump pipe a split dump design...i.e . seperate pipe for wastegate.

I have a split dump design on the 33 with the hi-flow and it seems to work a treat. It plumbs back in at the bottom of the dump where it bends to go to the cat.

Is there certain brand for this dump pipe I heard the Just Jap one is shite it apparently doesn't fit right