Rb20 Turbo Upgrade

[Tebie]

hi all,

just after some help on what turbos people here have choosen to upgrade their RB20.

i know people say upgrade to the RB25 turbo but i was wanting more.

i was after something which spools quickly as i am after some quick...

would something like a GT2530/35 be any good???

also what is the standard RB20 turbo?

any info would be sweet.

cheers

[Warpspeed]

Different people have different ideas about how radical they want to go....

An HKS 2530 will spool about the same as the original turbo, but you can run much higher boost because it does not have the problem of the fragile ceramic turbine wheel. The 2530 is also more efficient at higher pressure ratios, and has higher maximum airflow than the original turbo.

The problem is, these 2530 turbos are now getting very old and HKS don't make them anymore. A secondhand one may be worn out or stuffed.

But HKS are about to bring out a brand new replacement for the 2530 which is 2006 state of the art technology, called the GT-ZZ. The dealers do not have them yet, but maybe in a month or two, who knows ???

Latest technology with turbos, is like latest technology with computers, always better and advancing very rapidly as time goes on.

[Tebie]

how much boost can a standard turbo take?

how much more boost will a 2530 turbo take?

[4DoorWhore]

look into a ballbearing unit, spool time eliminated...

GT30 aint bad... 400 hp

[gt-t_r34]

look into a ballbearing unit, spool time eliminated...

GT30 aint bad... 400 hp

hows that work?? are most of the jap brand turbo's ball bearing anyways??

trust aren't there plain bearing i beleive

[WazR32GTSt]

the rb20 is laggy in stock form, there's no denying it

ANY turbo upgrade will increase the lag. you'd be a fool to convince yourself otherwise...

i went the rb25 turbo option to keep it driveable and don't regret it at all..

[Warpspeed]

Not always....

The old design turbos all had a much narrower flow range, so turbo matching was a lot more critical, a little bit too big, and it WOULD be a lag monster. Too small and there would be no top end airflow.

What the latest technology turbos have is a vastly wider flow range, as well as less inertia and a higher overall efficiency.

So you can now fit a larger turbo and get more airflow without losing anything in response or boost threshold. Or you can downsize slightly and get a massive improvement in response and mid range, without losing anything up top. It may not have much extra horsepower to brag about, but it will make a much faster and easier to drive road car.

Don't just think about turbo size, think also about flow range. The latest in turbo technology is always going to beat the older turbo designs in every way.

[nytrda]

Iv got a 2510, it isnt huge but still HAS heaps of lag but it is easy to drive an makes reasonable power

[limpus]

A 2510 is laggy on an rb20? wouldn't the response be just as good with the stocker but capable of much more flow?

[Tebie]

so if the RB20DET is laggy, what causes the lag?

is it because the throttle body is right in the middle of the rocker cover?

so with a front mount is has a long pipe from the cooler to the throttle body?

[nissan_280zx]

the RB20 is laggy because it is a low compression 2L six with tiny exhaust pulses.

[Tebie]

so nothing to do with the positioning of the throttle body and the long cooler pipe?

[WazR32GTSt]

no.

2L capacity = not much exhast gas being produced to spool the turbo at low rpm. this means the turbo comes on slowly

larger capacity engines produce more exhaust gas, thus find it easier to spin the exhaust wheel and can generate boost quicker...

TB has nothing to do with it, and length of cooler pipes makes sweet f*** all difference also.

[jazza08]

mmm.. you will find cooler piping does make a noticeable difference.

A top mount cooler running f**k all piping will seem quiet more responsive and less laggy, where as a large say 3' piping onto a fmic will obviously have more lag as the air has to travel further to get into the motor!

It wont be huge but its noticable!

In regards to the turbo you should get sh*t all lag with a HKS 25/10!

A 25/30 will be more similar to a stock turbo and can flow up to 280rwhp (with supporting mods),

Anything bigger and you really start to notice lag, which wen you run around with a low compression 2l motor isnt the best lol

Edited August 7, 2006 by jazza08

[WazR32GTSt]

so you have noticed this yourself, on your own car?

or are you writing from keyboard experience?

i went from the stock cooler to a larger FMIC with 2.75" piping and noticed no difference in lag. i think and change would be minimal and not noticable...

from my experience, its right in theory but doesn't really translate in the real world...

[jazza08]

Im writing from my mates 180, went from stock cooler on 10psi to fmic with 3' piping and increased lag by afew hundred rpms...

On my car i didnt seem to notice too much difference but my piping is 2.5' so not much bigger than stock

[Haysey]

I noticed a bit of lag since i put my cooler on yesterday, but more top end...

and VL turbo flutter... cho cho cho cho cho love it

Im thinking turbo upgrade too. My theory is best bang for buck, with 25% more flow, better top end and more boost. r33 turbo for $350 is best bang for buck in my eyes. spending over a grand on a turbo for a low teens car dosent appeal to me very much.....

[bbe]

i had stok cooler came on boost mad 2nd gear peelin on boost

went to 3inch mandrel from exhaust technology with hybrid cooler f*k me lag monster but yeh top pulls way harder !

mates cefiro same so yes lag is big issue with cooler pipes

[Tebie]

ok then...

if i got a standard R33 turbo hi-flowed etc could i get it turned into a ball bearing turbo?

or will it remain standard bush bearing/roller bearing?

and would the internal wheel be changed to a steel wheel or stay ceramic?

[jazza08]

GCG will put a ball bearing pack into the turbo, machine it out and put steel wheels in it. Most hi-flows do a similar job, not all use ball bearings tho