Some SR20DET Questions

[U WERE MINE]

hahah prank.. squizz ownzzzz ure ass

[PranK]

Originally posted by Squizz

I was being a smarty-pants PranK old chum, I didn't want to make this public already but here's what's on my car...

1991 180SX turbo

5 speed

Black

68,000 kms

HKS Camshafts

GReddy T518Z turbo

Stainless exhaust manifold

GReddy heavy duty actuator

Airpod

TRUST racing intercooler

GTR fuel pump

Upgraded injectors

Nismo fuel pressure regulator

Full exhaust with TRUST front pipe

Kaaz LSD

OS Giken twin plate clutch

Lightened OS flywheel

Upgraded S14 brake calipers and rotors

4 point rear roll cage

Tuned CPU

BLITZ boost controller

TEIN fully adjustable racing suspension

17" mags (different front and rear)

Recaro Drivers seat

Nardi Steering Wheel

Razo Pedals

And heaps of Gauges

I just SpankeD-a-PranK...:lol: :lol: :burnout:

ok "chum"... you win this time... but you are buying yours ALREADY DONE!! which is CHEATING!! :headbang:

give me 6 more months, stickman.. :uh-huh:

[Squizz]

:upurs: It's not cheating, it's cheap. Big difference :shake:

[Squizz]

Oh, and just think what I could do in those 6 months, Jesus-man.

[PranK]

i'll give YOU jesus-man when a smack yo ass with a lightening bolt!!

(lets take this to the wasteland?)

[Zer0]

Prank - did you get any info or prices on turbo's yet?

Also perhaps someone can give some more details about what turbos are on the S14 and S15 and their differences?

eg S14 has a T28

I thought that the S15 had a T28BB but someone posted that it has a GT2530?

Does the T28 on the S14 have ceramic wheels or steel or something else? Likewise for the other models? What is the best value turbo upgrade and roughly what would it cost? eg Hiflow the stock turbo with steel wheels costs? S15 turbo costs? is it worth hi-flowing a S15 turbo? etc.

[NIZ180]

just to answer some of your questions

The S14 T28 came out with both ball-bearing and non ball bearing and only ever has steel wheels.

The S15 turbo is a BB unit and rated at about 280HP

Best upgrade i would recommend is the Ray Hall special rated at 350HP or if you want a bit more go the -0032 CHRA good for 400HP

[Zer0]

You know roughly what they cost so that I have an idea?

[NIZ180]

Ray Hall Special for $2200

400HP GT25 for $2500

www.turbofast.com.au

You could probably get them cheaper if you shop around. I'm about to go get prices from one of the turbo shops down the road from my work so i will keep you posted.

[PranK]

zer0,

i haven't spoken to him yet, but shuld be ~ $1300 for a rebuilt GTiR turbs.

Christian

[Zer0]

hmmm... Sounds okay. What kind of power are these good for?

[NIZ180]

Was sorting through my docs and found this and thought it would help. Was originally posted by Rob Cadle (Garrett Engineer) on the SE-r list ions ago.

Article originally posted to Nissan SE-R list by Rob Cadle

Turbo Sizing and potential output

OEM:

S13 SR20DET: T-25, 60 trim 56mm BCI-1 compressor, 53.8mm 62 trim

T-25 turbine, .64 A/R turbine housing. Journal

bearings.

S14 SR20DET: T-28, 60 trim 60 mm BCI-1 compressor in T-04B housing,

62 trim 53.8mm T-25 turbine. .64 A/R turbine housing.

Ball bearing center section.

S15 SR20DET: Same as S14, but with Inco turbine wheel (instead of

GMR), cast divider wall between turbine discharge and

wastegate.

Pulsar GTi-R: T-28, 60 trim 60 mm BCI-1 compressor in standard T-3

housing. 79 trim 53.8mm Inco T-250 turbine wheel .86

A/R turbine housing. Journal bearings.

BB SR20DET: T-25. Basically, the same as the S13 Silvia.

HKS:

GT2510: T-28, 63 trim 60 mm BCI-1 compressor in T-04B housing.

62 trim 53.8mm T-25 turbine. .64 A/R turbine housing.

ball bearing center section.

GT2530: T-28, 63 trim 60 mm BCI-1 compressor in T-04B housing.

76 trim 53.8mm NS-111 turbine. .64 A/R turbine housing.

Ball bearing center section.

GT2540: 46 trim 76.2mm BCI-8 compressor in T-04E housing. 76 trim

53.8mm NS111 turbine. .64 A/R turbine housing. Ball

bearing center section.

GT2835: I believe that the following is the spec for this, but I could be

wrong:

48,52, or 56 trim 71mm BCI-18C compressor in T-04E housing.

84 or 90 trim UHP turbine cut down from 60mm to 56.5 mm.

.64 or .86 A/R turbine housing. BB center section.

GT3037: 48,52, or 56 trim 76.2mm BCI-18C compressor in T-04E housing.

84 trim 60mm UHP turbine. .61, .73, .89, and 1.06 A/R

turbine housing. Ball bearing center section.

Turbonetics:

Super 60 T-3: This could be about anything, but is usually a 65 trim

60mm BCI-1 compressor wheel in either a standard T-3

or a T-04B compressor housing, with a 62 trim 58.x mm

T-3 turbine wheel in a .49 A/R turbine housing.

Stage 3 T3/T-04E hybrid turbo. 40-60 trim 76mm BCI-4 or BCI-8

compressor wheel in T-04E housing. 76 trim 65 mm T31

turbine in .49-.82 A/R housing.

Stage 5 T3/T-04E hybrid turbo. 40-60 trim 76mm BCI-4 or BCI-8

compressor wheel in T-04E housing. 76 trim 72 mm T350

turbine in .63 or .82 A/R housing.

Now, my opinions:

Stock:

The T-25 seems to be OK up to around 1 bar of boost with a 3" exhaust and no

cat. This can support about 240 whp with no cat. With a cat, I would run

no more than 10-12 psi. Expect about 220 whp.

The S14 T-28 spools really nice, but has the same tiny turbine as the T-25.

It can't support much more hp. I'd say 240-260 or so wheel hp max. You can

get more power by running more boost, buy you do so at the risk of breaking

things.

GTi-R T-28 is a really good turbo. I think that it is better if you lose

the T-3 compressor housing and get a housing off of the S14. This is a big

improvment. With the T-04B compressor housing, the GTi-R turbo can support

about 16 psi and 280+ wheel hp. Makes pretty good boost by 3500 RPM, too.

HKS:

GT2510 is expensive and only has marginally better performance than the

Bluebird and S13/14 standard turbos. Yes, it has better transient response

because it is ball bearing, but it's not like a stock journal bearing T25 is

a spool dog. I would personally buy something else first. I don't think

you will be able to measure any improvment over a standard S14 turbo with

this one, and it costs a *LOT* more.

GT2530: This is a pretty good turbo, but I don't understand why HKS won't

offer it with the larger .86 A/R turbine housing. This with the larger

turbine housing will outperform a GTi-R turbo. This should be good for 300

whp and good response from 3000 RPM on up.

GT2540: IMO, this turbo is a big piece of shit. This is my opinion as I

haven't tried one. But, looking at the maps, it looks like a pile of shit.

I have heard annecdotal evidance from people I respect that it works pretty

well, but I wouldn't put one my car and find out. There is too big of a

size mismatch between the 53.8mm turbine and the 76mm compressor. Also, it

is insane to run a .64A/R on the turbine given the flow capacity of the

compressor. This turbine and this compressor are both really good on their

own, but they are worthless together. Total mismatch. Save your money.

GT2835: If this turbo is actually what I described above (check to make sure

before you buy), this should be a pretty good turbo. Get the 56 trim

compressor wheel and the 90 trim turbine wheel with a .86 A/R turbine

housing. This should make good boost by 3500 RPM and should support 375-400

or so wheel hp.

GT3037: This is the mother load of turbos. Get the 52 trim compressor and

.73 A/R turbine housing for good streetability and ~400-425 or so whp. Get

the 56 trim compressor and .89 A/R turbine housing is you can live with a

little more lag and want ~475+ hp.

Turbonetics:

Straight T3 is an OK 2.0L turbo. Gets good boost about 3k RPM, will make

about 250-275 whp. Cost and installation is the same as other, larger

turbos, though, so I'd just rather go bigger and take 500 RPM later

response.

Stage 3 T3/T04E hybrid. Get the 50 trim compressor wheel, and only the 50

trim compressor wheel. Get the .63 A/R turbine housing for boost response

by 3500 RPM. This will support about 320 whp. Get the .82 A/R turbine

housing is you can live with full boost ~800 RPM later. This will support

~400 whp.

Stage 5 T3/T-04E hybrid. Only run the .82 A/R turbine housing. If you want

less lag, get a smaller wheel. Run the 60 trim compressor wheel. Don't run

a 60-1 wheel (shit) or the smaller trim T-04E wheels. This turbo will

support about 475-525 whp (don't know on the top end--we haven't maxed one

out yet!). Expect soggy boost repsonse below 4500-5000 RPM.

As an aside, many of the HKS turbos are available from INCON for

significantly less money. They are also a little more flexible about

housing configuration. The guys at INCON disagree with me typically when it

comes to matching on small displacment motors. In fact, many people do. You

can take or leave my advice. Please don't contact me and say "person x at

company y told me the turbo you spec'd is no good and this other one is

better". I have heard it all before. Those turbos are what I recommend,

and you can either listen to me or listen to them. I don't want to play a

game of 'he said/she said'.

Rob