Hi Flow On Rb20

[black_32]

im hvin some trouble with my car its an r32 with an rb20 its got a fmic 3" dump pipe Stock front and cat and a 3.5" cat-back. i recently put a r33 hi flow turbo on. originally i had no boost controller and it would start boostin at bout 3000rpm very slowly till it reached 0.5 bar at a bit after 4000rpm (i think i wasnt payin that much attention) then i put a boost controller on and turned it up a bit and it would start boostin at the same point and very slowly till it got to 4200rpm then comes on very strong but when u change gears it doesnt hold boost very well with the stock turbo it would spin a little into 2nd but not it spins a lot less then lags a bit more before it gets back on power thanks for ur help

[Ronin]

Bigger turbo = more lag. Not much u can do about it. Cams may help abit.

[Hks_12]

Get a 3" front pipe and high flow 3"cat and see what happens.

[Interloper]

I have a R34 GTT highflow and it is heaps laggy even compared to a non highflow GTT turbo. full boost is 4500rpm.

my advice is to get a full exhaust and all supporting mods and get a proper tune using remap stock ecu or PowerFC.

[nF]

got an r33 hi-flow on my r32

fullboost ~4.5k, but once its there its hold on, though i have the same problem on gear changes, flatshift might be the way

i'm planning on loosening up the bov a bit to keep it spooling a bit longer at the moment it just wa-cha-chas

[R31Nismoid]

http://www.skylinesaustralia.com/forums/in...howtopic=103095

this is long, worth the read however

http://www.skylinesaustralia.com/forums/in...showtopic=58229

[BHDave]

You seem to have identical response to mine when i ran a highflow on my rb20. Unfortuanely the shift between 1st and 2nd drops you below the boost threshold (as more than likely you will have the tyres spinning through first) which is something you just cant fix short of installing some form of antilag system.

What should be happening is when you plant it in second it will break traction when boost comes on about 4k. And the 2nd-3rd shift should keep you on boost with minimal lag on the shift. Unfortuantely you have to be on the ball now to drive it quickly, you have to keep the revs up and run it out to redline and your engine will get tired as a result.

[black_32]

well thanks very much for ur help was more hoping i had a prob with the car but oh well just hve to work on a few things

[sky30]

Im running a High-flow on a RB20, with 260 degree 8.8mm lift cams installed it starts boosting at 3000rpm, and makes 15psi at about 3800rpm.

This is alot earlier boost compared to when i had stock cams with the same turbo.

Maybe try some cams with bigger lift to get earlier cylinder filling, or play with some cam gears.

[silver gts-t]

dam....

i thought i was the only one with a highflow on a rb20 that comes on a 4k..

im not spending thousand bucks on cams that will give me 200rpm earlier boost

[black_32]

i know what u mean that $1000 could be spent some where else oh well ill learn to live with it might try muckin round with cam gears

[Oblivion]

hmmm i would like cams, cause it does give a better power delivery, but atm, i would like to ECU, better money there.

a quick question, where did you get those little pics of the skylines, that you make up yourselves??

[sky30]

dam....

i thought i was the only one with a highflow on a rb20 that comes on a 4k..

im not spending thousand bucks on cams that will give me 200rpm earlier boost

<{POST_SNAPBACK}>

It actually starts boosting at 3000rpm, in forth gear it can make full boost as early as 3600rpm. This is atleast 400rpm earlier than the stock cams with this turbo, and the cams only cost me $600 second hand.

The money would be better spent on an ECU if you didnt have one, but once you have and ECU,and all the other basic mods cams are a good option, especially to make the car less laggy, and more streetable.