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Tech Talk Technical Discussion About The Nissan 240SX and Nissan Z Cars |
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09-27-2010, 02:56 PM | #1681 |
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... just putted my 2871 at 1.4 bar with 1.5 at peak. No problems so far.
Nevertheless, a mhg + studs etc. is going in this winter. 1 bar with a proper tune should no were near a problem. |
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10-04-2010, 02:03 PM | #1682 |
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Just put down 352whp and about 285ftlbs on 16psi. 94 octane
gt2871r .64 tial v band housing custom tubular mani, 740cc nismos,haltech sport 1000 ecu, isis intake mani,jwt 260 cams,cometic mls hg,arp studs. and supporting mods. was on dyno dynamics at a correction of 1.13, All the credit goes to Bill Bowering in Langley BC Canada. For doing an amazing job tuning the car. Dyno Sheets: |
10-04-2010, 02:06 PM | #1683 | |
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10-04-2010, 02:13 PM | #1684 |
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Sorry ya I just added a few things. I have jwt 260 cams. Im happy with the torque timing map is pretty conservative and its a touch on the rich side becuase of the altitude difference that the car often covers this car is a year round dd in interior of BC. Also keep in mind that this is a dyno dynamics on correction of 1.13 dyno jet numbers are usually 13 to 18 percent higher so that may have an affect on the torque number but I am not entirely sure.On another note the dyno was a bit of on gearing the sheet says it stops at 7000 when we were running to 7400.
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10-04-2010, 02:44 PM | #1686 |
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mani works well I gasket matched it and cleaned it up a bit inside becuase it was off but it seams to be working well. I am very pleased with the hp level at 16psi.
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10-04-2010, 02:46 PM | #1687 | |
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So this is correcting to the Dyno jet numbers? So your numbers read closer to dynojet numbers? or does it correct for dynojet numbers so it reads 13-18 percent lower.
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10-04-2010, 03:25 PM | #1688 | |
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10-04-2010, 05:22 PM | #1689 | |
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10-04-2010, 06:26 PM | #1690 |
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Oh if they are corrected then I take back what I said, and will agree with Slider....that does seem 'sorta low' for the dyno. I assume it's a standalone car
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10-04-2010, 09:52 PM | #1692 |
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10-05-2010, 12:15 AM | #1693 |
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Haltech sport 1000 and what makes this seam like a low number? in comparison to what? I have yet to see the same setup. Maybe the combination of a short runner intake mani and small frame turbo?
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10-05-2010, 08:02 AM | #1694 | |
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The two things that stick ouu to me, are the tuning and the tubular exhast manifold...
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10-05-2010, 09:48 AM | #1695 |
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Before you start posting in this thread, did you happen the read any previous pages at all. There are a LOT of people running the same setup.... Is it possible the correction is just in HP instead but not the tq curve? Could that be possible cody?
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10-05-2010, 10:10 AM | #1696 |
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I have read the entire thread it is why I switched down to a 28 from 30 and by same as my setup I was referring to turbine housing cams and intake mani. And as to the correction it could be just HP but I would think it would be both
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10-05-2010, 11:18 AM | #1697 | ||
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Honestly though, correcting numbers to 'make' other numbers is kinda lame IMO as it is not ever an exact science, nor does it make any difference in the grand scheme of things (unless trying for some odd internet legend bragging rights which way to many get caught up in) Quote:
Also: Why only to 7000 rpm?
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10-05-2010, 11:41 AM | #1698 |
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Torque curve seams fine to me. The gear ratio was a bit off on the dyno the soft cut was 7400 hard cut is 7700 and the cams plateu at 7500 thats why its there.Every dyno has a correction for many reason this is only 1.13 which is just attempting to make it semi close to dyno jet becuase its what most people are familiar with. Not to make bigger numbers I switched to a smaller turbo to have a power band I enjoy more. I posted this info up here so that other users could just see more gt2871 sr info.Not to prove anything. The car is super fun to drive and stays in boost whenever I want unliek the 30 did.
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10-05-2010, 11:59 AM | #1699 | |
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10-05-2010, 12:04 PM | #1700 |
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On another note roninwon a ways back makes 340 and 260 on 15psi. are you sure it doesnt just look weird in comparison to your dyno sheet cody becuase somehow your car makes a ton of torque. Im jealous not going to lie.
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10-05-2010, 12:10 PM | #1701 | |
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10-05-2010, 07:51 PM | #1703 |
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If you were telling me not to be offended have no worries I'm not. And slider not trying to cut you down but that looks alot more like 290ish than 310. Agreed the gap between my numbers looks a touch larger than most but I think that's due to a short runner intake and a long runner top mount exhaust mani. Regardless I am pleased with the results and will continue to slide around on a daily basis.
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10-05-2010, 10:17 PM | #1704 | |||
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And yes, there is something to be said about how the 28 just makes for a all around better mannered street car, while being just as fun. I hate waiting...28's don't wait ehehe Quote:
Don't take what we say as hate (and It seems your not)...we're just trying to get your setup sorted out in our nerdy little heads to understand it better (in relation to all other 28 setups) Quote:
(and I agree, I don't see the 310 ft lbs either (even after doing reverse math)...i mean 300ish maybe at most, but we may simply be splitting hairs here...
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10-06-2010, 03:40 AM | #1706 |
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As for tuning it was done by a reputable tuner tuning for mbt with knock ears just in case and we then Pulled 2 degrees and richened it up a hair across the board to account for any elevation issues.
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10-06-2010, 07:43 AM | #1707 | |
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Stock flywheel won't effect it that much..in fact it will help load the turbo and create more torque sooner.
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10-06-2010, 08:56 AM | #1708 |
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took my car fora drive yesterday never went over 3000 really, maybe up to 3500 a couple times. but the sr22 spooled the gt2871 .86 to 5 pounds of boost by 3000 in 3rd gear. witha stock manifold exhaust and bc 264 cams, enthalpy tune. greddy intake. deffiently has some low end torque going on. you can just feel it.
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10-07-2010, 07:42 AM | #1709 |
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I'm looking at a car and the guy says this is the set up.
gt2871r turbo with gt3071r internals. turbo compressor .42ar 72 trim, turbine .63ar 62 trim bc 272/272 cams What do you guys think? Are the cams too much for the turbo? |
10-08-2010, 04:15 AM | #1710 | |
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The only difference between a GT3071R 56 Trim and a GT2871R 56 trim is the exhaust wheel and a bigger compressor housing thats interchangeable. 272 Cams will be fine if your upgrading in the future, I got a ride from a member on this board with 272 duration Cams and a S15 T28 and it pulled hard, lag wasnt even much of a difference. |
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