JBR under car piping video.
- Thread starter Faeker
- Start date
PoonFlavoredTang
Greenie N00B Member
They are both based off a Garrett turbine wheel. In fact the HTA3586 is exactly a GT35r exhaust wheel. If I remember correctly the BNRs4 is the GT30r exhaust wheel. @JgamB potentially could elaborate more on that.
The BNR also uses a smaller A/R on the hotside, which should spool faster. Although, the compressor wheels are different. The most notable one being cast vs billet. I would imagine the hotside would be more important to spool though.
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It's pretty simple for me: GT3076s spool faster than GT35s. A BNR S4 is a GT3076 "lite," with smaller wheels/housings. I realize it's not DBB, but if anything, I think it'd be faster than a regular GT3076, let alone any GT35-framed turbo. But my logic may be failing miserably...
PoonFlavoredTang
Greenie N00B Member
SnailD had an S4 spooling by 3,600 in CO alititude, IIRC.
Faeker
Greenie N00B Member
Can't over science what's already factual. Look at their specific specs.
BNR S4.
PoonFlavoredTang
Greenie N00B Member
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Looks steeper than mine a bit. Probably Rob don't want to granade my stock block lol.
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PoonFlavoredTang
Greenie N00B Member
The BNR is right with it. 20psi @3407rpms according to the log.
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It looks steeper b/c of the scale.
I got surprised with the spooling time. Very very close with the S3, but with a robust top end. I cant wait to finish tuning this thing. Winter its a bish.
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Stock block. Finkle takes care of the tuning. Goals are 380whp. I might do a pop and drop later this year.
Mikey
Greenie N00B Member
Gotcha, was hoping you had a built block so we could compare, especially for the price of the S4.
Now that's more like it. The old graph showed 20psi by like 4,000. This seems much more reasonable and what I expected based on the specs of the S4 in comparison to a regular GT3076. What's your altitude in NC, BTW? Bang-for-the-buck wise, that's hard to beat. I'm sure @Mikey 's HTA3076 has waaaaaayy more top-end, though. He pulls trains on my S3 and is easily at 500+whp.
Fortunately, I've had much better luck with my Synapse. Love it and holds like a champ
Not apples to apples, but here's my S3 vs. a GT2876r (pretty sure we both would've spooled earlier if we went WOT sooner). I don't think the JBR piping is negatively impacting my spool at all. My ramp-up is nearly that of a K04:
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That hose should hold... I would put a coil like they do with Diesel boost tube to keep that expansion in check.
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PoonFlavoredTang
Greenie N00B Member
Now that's more like it. The old graph showed 20psi by like 4,000. This seems much more reasonable and what I expected based on the specs of the S4 in comparison to a regular GT3076. What's your altitude in NC, BTW? Bang-for-the-buck wise, that's hard to beat. I'm sure @Mikey 's HTA3076 has waaaaaayy more top-end, though. He pulls trains on my S3 and is easily at 500+whp.
Fortunately, I've had much better luck with my Synapse. Love it and holds like a champ
Not apples to apples, but here's my S3 vs. a GT2876r (pretty sure we both would've spooled earlier if we went WOT sooner). I don't think the JBR piping is negatively impacting my spool at all. My ramp-up is nearly that of a K04:
View attachment 394
What you were noticing was the phenomena between 3rd and 4th gear spool times.
Oh, the other graph was from 3rd? Yep, that'll definitely make it take longer, haha.
WetzMS3
Greenie N00B Member
I'm kind of lost as to why you guys are comparing logs and spool at all, let alone on different setups.
Isn't the real issue and largest concern of this development, potential catastrophic failure of the silicone piping? I don't recall reduced spool even being an advertised benefit of this kit, could be wrong there. However, a couple hundred RPM of spool makes no difference either way if the risk of the piping failing altogether is remotely possible. Pop a coupler on the side of the road or at the track, its fairly easy to fix. Blow a hole in the entire cold or hot side silicone piping, and you need a tow.
I think the real question here is, what was the point of failure when tested? What kind of longevity tests have been done and under what conditions? If it has actually been proven that this repeated flexing does not reduce the lifespan or add stress to the silicone, then by all means worry about a couple hundred rpm worth of spool.
I may have missed something in all of this.
Isn't the real issue and largest concern of this development, potential catastrophic failure of the silicone piping? I don't recall reduced spool even being an advertised benefit of this kit, could be wrong there. However, a couple hundred RPM of spool makes no difference either way if the risk of the piping failing altogether is remotely possible. Pop a coupler on the side of the road or at the track, its fairly easy to fix. Blow a hole in the entire cold or hot side silicone piping, and you need a tow.
I think the real question here is, what was the point of failure when tested? What kind of longevity tests have been done and under what conditions? If it has actually been proven that this repeated flexing does not reduce the lifespan or add stress to the silicone, then by all means worry about a couple hundred rpm worth of spool.
I may have missed something in all of this.