turbo question
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Elder User
Joined: Jan 2004
Posts: 748
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From: Afton NY
turbo question
the 95 i just bought. the guy i got it from said he put a bigger turbo on it. it does not sound like my 94 at all. it sound like my dads 01 ps. when the ebpv is closed its much more distinct sound and loud. is the 01 turbo bigger? how can i check?
Hotshot
Joined: Oct 2003
Posts: 17,799
Likes: 104
From: Ashland City, TN
The NBS PSD's have a very similar turbo, Bigger? Slightly.
TP38 is the OBS turbo, and the GTP38 is the NBS turbo.
Different AR on the parts, but the inducer wheel is the same size, so in that sense, no its not a bigger turbo.
Does it have a waste gate on it? thats an easy way to tell if its an SD turbo along with the garret markings on the intake.
TP38 is the OBS turbo, and the GTP38 is the NBS turbo.
Different AR on the parts, but the inducer wheel is the same size, so in that sense, no its not a bigger turbo.
Does it have a waste gate on it? thats an easy way to tell if its an SD turbo along with the garret markings on the intake.
Hotshot
Joined: Jul 2003
Posts: 12,177
Likes: 40
From: Newport, WA
The NBS PSD's have a very similar turbo, Bigger? Slightly.
TP38 is the OBS turbo, and the GTP38 is the NBS turbo.
Different AR on the parts, but the inducer wheel is the same size, so in that sense, no its not a bigger turbo.
Does it have a waste gate on it? thats an easy way to tell if its an SD turbo along with the garret markings on the intake.
TP38 is the OBS turbo, and the GTP38 is the NBS turbo.
Different AR on the parts, but the inducer wheel is the same size, so in that sense, no its not a bigger turbo.
Does it have a waste gate on it? thats an easy way to tell if its an SD turbo along with the garret markings on the intake.
The A/R ratios are the same on the compressor side, but the late SD turbo is physically larger. The turbine A/R is different on the SD turbo because its a gated turbo.
Is the collector a V-band or a flange? The stock turbo on our trucks uses a T4 flange. The SD's use a V-band.
Hotshot
Joined: Jun 2007
Posts: 10,008
Likes: 7
From: Austin, TX
Can you post a picture of your turbo??? the SD turbo has a larger compressor housing and smaller turbine housing. Do they perform better?? IMO, no they don't. The compressor wheels are the same size, but the OBS wheel is the better wheel design b/c the SD wheel surges. Even the van turbos seem to have a tendancy to surge sometimes.
Hotshot
Joined: Jul 2003
Posts: 12,177
Likes: 40
From: Newport, WA
The SD wheel moves more air than the OBS wheel, which is why it ends up surging. The only thing an SD turbo has over an OBS turbo is spool time. My E99 truck (especially after it was tuned) could get the turbo lit pretty fast. My 96 with basically the same motor as my E99 is a laggy pig.
Hotshot
Joined: Jul 2003
Posts: 12,177
Likes: 40
From: Newport, WA
That little wastegated turbine housing on the SD spins up pretty quick, even with just AB's pushing it.
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Junior User
Joined: Jan 2010
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Ill attest to the quick spool of the stage 1 OBS. Spools instantly to be honest!!!!
Great setup...I kind of miss it
Great setup...I kind of miss it
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Hotshot
Joined: Jun 2007
Posts: 10,008
Likes: 7
From: Austin, TX
Mine used to spool almost instantly, but now it takes a few seconds for it to spool and when it spools it spools slowly up to full boost instead of going straight from 8psi up to 30+ in less than 1/2 a second it now takes a few seconds to finally get up to 25psi. LOL. Worn out turbo, boost leaks... Gotta love it.
Hotshot
Joined: Jun 2007
Posts: 10,008
Likes: 7
From: Austin, TX
Hmmm... I have some H11 headstuds here, some built heads, DI 3" aluminum intake plenums, and a Murff T-4 kit.. I'm close. Just need a turbo right? LOL
Hotshot
Joined: Jul 2003
Posts: 12,177
Likes: 40
From: Newport, WA
