Rb20det With R34 Rb25det Turbo

[mystery_kid]

so i've just installed an R34 rb25 turbo in my r32gts-t

it's not full boosting until around 4200~rpm

i know it's slightly bigger than the r33 version but shit it's pretty laggy

does this sound right?

Edited April 28, 2010 by mystery_kid

[Trozzle]

define full boost, psi?

supporting mods?

[mad082]

sounds about right for a rb20 lag monster, maybe a touch high. but it comes down to a few things. the boost level you are running as well as the condition of the engine (compression) and other things like the tune.

[mystery_kid]

it's just an r32 with the standard mods, 3" exhaust, pod filter, front mount etc

it's telling me it's hitting 0.7bar so 10psi

it's definitely just after 4000, maybe not 4300.

[Harey]

which gear? boost reponse in rpm varies greatly between gears

[Bunta]

sounds roughly right to me

[mystery_kid]

2nd/3rd

it seems fairly similar for both

as i said 4300 might have been an exageration it's hard to tell exactly cause when it does come on boost you need your eyes on the road cause it goes pretty good once it's there lol

but it's deinfiely not until 4000~ minimum

[bubba]

Sounds about right, Neo turbos have a bigger exhaust housing than normal RB25 turbos and the 25 turbo on my 20 wasn't making 12psi until 3500rpm.

[lachlanw]

as i once read on here . no turbo apart form a stock one is going to do anything on a 20det below 4000

my flat mate has a s13 with rb20det in it . r34 turbo good exhaust shit front mount good fuel pump . it made 190+ kw at the hubs on 11.5 psi . upon looking at the graph its not at full boost untill 4300. its not too bad when combined with the lighter weight of the s13 . car has run an 13.2 on shit tires and low hard adjusties

[mystery_kid]

yeah i'm not too worried

i'll just get used to it and what gears to use

goes pretty good when you give it the berries

[toffy]

cam gears and a tune will help , i thought my kkr430 was laggy but it gets full boost about the same rpm and my other car has a hks 2530 and that hits full boost about 3800 to 4k not tuned properly .

[mystery_kid]

yeah next step will be an apexi safc and a tune

[toffy]

nah don't waste your time with a safc , get the ecu re-mapped by dr drift or whoever does it in your state?

[mystery_kid]

dr drift is a hassle as he's not from qld and i'm not really even sure of anyone else that does it here

with the mods i have an safc will do the job fine imo

[mad082]

scrap the safc. get a nistune. similar money but will give you much better results as you can actually adjust the timing which will actually help you get the boost to come on earlier. all using a safc will do is lean it out a bit and slightly bump up the timing (which is more of a side effect than an actual adjustment).

there will be a few places in brissy that will do it, or if you were to drive up to gympie my mate runs a workshop with a dyno and can do it.

[Bunta]

dr drift is a hassle as he's not from qld and i'm not really even sure of anyone else that does it here

with the mods i have an safc will do the job fine imo

Give EFI performance in Yatala call they do good work with nistunes and pretty cheap too