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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 02-21-2007, 02:40 PM   #1
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Default 300zx turboes

I found a website online that sells oem turbos from all sorts of cars. I was looking at getting a t25 from a twin turbo 300zx to fit on my megan racing manifold and dp. The turbos are in good shape but they are not rebuilt and are about $199 without shipping. But there are options like left or right side. Does this matter and both turbos are the same size right? Sorry about this being a nissan question but was wondering if anybodyt knew.
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Old 02-21-2007, 03:51 PM   #2
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More important is that I don't believe the Nissan T25 will fit the DSM flanged Megan Racing stuff.
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Old 02-21-2007, 04:43 PM   #3
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I'm not sure but I think the t25's from the 300zx's are pretty smalll. You're better off with one from a sr20.
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Old 02-21-2007, 05:12 PM   #4
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I am running a T25 from a Nissan 300zx...

Depending upon your goals, it maybe too small...

The only difference I am aware of on L/R side is the clocking of the comp housing...
It fits my HKS manifold just fine
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Old 02-21-2007, 07:59 PM   #5
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Heh heh, sorry I found this amusing.

Im a Nissan guy and im in between projects. I was looking at getting a miata and therefore lurking around to scope out the community. I just had to respond to this post, as I feel I can set a few things strait.

The T25 off of the 300zxTT and the s13 (91-98) SR20det's are identical. A T25 is a T25, right? Now, im more if an inline motor guy and i hate all things "V", but im pretty sure the left and right turbos from the 300zx's are the same; the right side turbo is mounted 180deg, if that makes and sense.

All Nissans (past 91) and thier turbos respectivly use a standard flange. T3 or T4 I believe. Im not sure what, say the Greddy turbo kit would use, but front what Ive read in the last few minutes on this forum it sounds like Mitsubishi-type IHI turbos. I honestly dont know anything about them (i stay away from Mitsu's), but i do know if aftermarket turbo manifold manufactures copy Greddy, then no, yould need to have a T3 flange welded on. It's realy not too big a task though.

I wouldnt bother with a T25 though. If your going to go through all the trouble of building a turbo kit for a nissan turbo, then look into the later ball bearing turbos found on the S14/S15 Silvia SR20dets or the GTi-R (RNN14) Pulsar SR20det turbos. They are dual ball-bearing and are the basic turbo upgrade for us SR guys. A stock motor with an S15 turbo is capable of over 325hp without too much trouble. A bit much for a Miata, but you get the idea A T25 (which is non-ball bearing) tops out at about 250 on an SR. Once again, im not certain of what that means to a 1.6/1.8 Roadster engine, but its a good reference.

Good luck,
Joe
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Old 02-21-2007, 08:06 PM   #6
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the megan racing manifolds use a standard 16g flange and will not take a nissan turbo, by any means that i am aware of.
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Old 02-21-2007, 08:12 PM   #7
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300zx downpipe flange is diff, and is T2 flanged, I have one.
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Old 02-21-2007, 11:48 PM   #8
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Quote:
Originally Posted by SilviaivliS View Post
A T25 is a T25, right?
Wooah Cowboy!
First, a T25 is not a T25. There are about a dozen common flavors. You are correct about the s13 and 300zx sharing the same A/R's of .48/.49. The S14 jumped up to .80/.64. I think they share the same compressor housings, but the turbine housings on the 300zx are funky 3-bolts outlets.

Since there weren't any USDM turbo motors except the 300zxTT past '91, I'm assuming you're talking about JDM SR20det and CA18det motors when you refer to "all Nissan's". Every stock Nissan turbo I've ever seen that didn't come on a late model 300zx used a Standard square T25 turbine inlet and standard 5-bolt turbine oultet... which is nothing like a T3 or T4. The early late '80's 300zx single turbo's were also .48/.49 but used the standard flanges, not the funky 3-bolts of the later gen.

I was running the .48/.49 version for awhile and saw 167rwhp at 18psi with crappy tuning and a slipping clutch. I'm sure that 220-240rwhp is achievable with that turbo and proper tuning... maybe a pinch more. I have yet to fire up my .80/.64 (this weekend hopefully) but imagine the tradeoff will a couple hundred rps's worth of spool, but more air per psi... we'll see how she runs in a couple of days.

The best place to find a .48/.49 CHRA/wheels is in the 2G DSM. They're available in working condition on half-a-dozen forums for about $150 but have the Mitsu turbine housing and will work with the Megan stuff. The SR20det .80/.64's are a little more expensive and you'll be better off forking over the dough for a Begi manifold. Try DSMtrader.com or sr20forums.com for turbos depending on your route.

I/we have found around here that a drawback to a stock T25 is that the internal wastegate port is small and causes boost control problems... either creep or overshoot... and needs to be ported (which is pretty easy and all the DSM guys do it) to flow well.
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Old 02-22-2007, 10:30 AM   #9
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Quote:
Originally Posted by SilviaivliS View Post
All Nissans (past 91) and thier turbos respectivly use a standard flange. T3 or T4 I believe.
?????

All of the sr20 turbos have a t2 flange, I don't think Nissan has used a T3 flange since the z31 turbo.
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Old 02-22-2007, 10:38 AM   #10
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the 300zx on my 1.6 on a 3 inch exhaust spools quick as ****. i can hear my turbo constantly at any speed over 60 working hard.
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