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**DONOTDELETE**
06-01-2001, 10:49 AM
A question for all you SR owners out there. I just complete the SR swap and want to explore some turbo upgrade options. The one thing I DON'T want to do is change the factory exhaust manifold... here are the following things I might want to try

1) rebuild current T25 turbo and try to fit a bigger compressor wheel

2) rebuild T25 as above but also add a ball bearing.

3) replace with a bigger turbo, preferably the T3/T4. Only issue here is if it will fit. I heard that the T3/T4 turbos can be made with a T2 mounting surface / flange. Is that possible? Would I run into any clearance problems if I tried to mount a T3/T4 turbo without changing the manifold?

Please excuse my ignorance if these questions sound dumb, I'm not very experienced at all when it comes to turbos... these are my buddies suggestions, but I would rather get some first hand info from the SR owners. Thanks.

Tom.

06-01-2001, 12:22 PM
<BLOCKQUOTE><font size="1" face="Verdana, Arial[/img]quote:</font><HR>Originally posted by webcrawler:

1) rebuild current T25 turbo and try to fit a bigger compressor wheel
<HR></BLOCKQUOTE>

That's an option...you should talk to some turbo rebuilders and see if that's feasible. However, a big limitation of the stock T25 is the turbine side -- it's very small and restrictive.


2) rebuild T25 as above but also add a ball bearing.


You can't just "add" a ball bearing when you rebuild a turbo. You have to replace the entire center section, which is the majority of the turbo's cost anyway.


3) replace with a bigger turbo, preferably the T3/T4. Only issue here is if it will fit. I heard that the T3/T4 turbos can be made with a T2 mounting surface / flange. Is that possible? Would I run into any clearance problems if I tried to mount a T3/T4 turbo without changing the manifold?


I'm not sure if T3/T4's can be made with T25 flanges -- might want to call a turbo place like Turbonetics and ask them. Also, check into HKS' GT-series turbos -- they have a T25 flange, but are ball-bearing and have better flowing compressor and turbine sections. They're pretty expensive though.

Another option is to rig up a J-pipe like this: http://cgi.ebay.com/ebaymotors/aw-cgi/eBayISAPI.dll?ViewItem&item=591757743

You'll need to have new intake piping and a downpipe made, but you can keep the factory manifold, and you can have the J-pipe made for whatever turbo you want to stick on there (T3/T4, or Mitsubishi, etc.).

Asad

NY S13 SR
06-01-2001, 05:36 PM
Heh heh, saw that j-pipe too huh? I wish it was for a T3.... then I'd be bidding on it! Looks like you could maybe have hood clearance problems though.

The easiest upgrade for S13 SR's is to get a S14 ball bearing turbo. Yury says he can hear his spinning down as he walks away from his car. Neat.

Thanks,
__________________________
Jeff Holden

www.heavythrottle.com (http://www.heavythrottle.com)




[This message has been edited by NY S13 SR (edited 06-01-2001).]

**DONOTDELETE**
06-02-2001, 06:34 AM
Just get a T3 flange and weld it on the manifold. Make sure it's TIG welded on, cause MIG welding on cast iron doesn't do a good job.

Mark

**DONOTDELETE**
06-03-2001, 08:32 PM
some place sells an adapter to put a bigger turbo on the stock manifold..but im sorry that i forgot the name.....

also..i have a turbo from an S14 that i wont need....i bought a new one.....

**DONOTDELETE**
06-03-2001, 08:33 PM
just email me at Beaubo334@aol.com

Mav1178
06-03-2001, 09:31 PM
From Rob Cadle of SE-R list.""""""

For the record:

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 ****. This is my opinion as I
haven't tried one. But, looking at the maps, it looks like a pile of ****.
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 (****) 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.

NY S13 SR
06-04-2001, 08:33 AM
Juicy info, thanks man!!!

Jeff
www.heavythrottle.com (http://www.heavythrottle.com)

240sxTurbo
06-04-2001, 09:47 AM
definitely a needed on our end....thanks

Joel Burke

ADAM HUTCHINSON
06-04-2001, 11:59 PM
hi joel...i wanted to thank you for the inspiration on my sohc 240sx turbo project

Mo
06-10-2001, 08:28 AM
I needed that because I am planning to upgrade the turbo when I do S14 engine swap on my truck. I like the way you broke down the HP ranges too. Thanks

3Leater
06-11-2001, 10:12 AM
Anyone have any experince at all with the TS04 turbo?

I was looking over possible compressor maps and found that the TS04 seems to come very close to what I want.

Thinking like a TS04 with a .58 A/R to help it spool faster, what do y'all think?

06-11-2001, 12:57 PM
What's your expected hp range? If you're going with something as big as a TS04, then you're probably looking at ~450ish? In that case...I wouldn't worry about spool, because nothing is going to spool quickly. Your main goal should be to reduce turbine backpressure -- i.e. a big turbine wheel.

Asad

<BLOCKQUOTE><font size="1" face="Verdana, Arial[/img]quote:</font><HR>Originally posted by URNDWAY:
Anyone have any experince at all with the TS04 turbo?

I was looking over possible compressor maps and found that the TS04 seems to come very close to what I want.

Thinking like a TS04 with a .58 A/R to help it spool faster, what do y'all think?<HR></BLOCKQUOTE>