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Tech Talk Technical Discussion About The Nissan 240SX and Nissan Z Cars |
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09-15-2008, 06:03 PM | #451 |
Zilvia Junkie
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You haven't talked to someone that has been running it for very long then.
Ethanol is extremely corrosive, and as such, wreaks havoc on major fuel system components. Unless you are ready to change every single piece of the fuel delivery system from cell to injector o-rings, you will experience parts failures that could potentially lead to engine failure due to lean condition. I'm not saying it isn't a decent race fuel. I'm not saying it doesn't make good power and show remarkable qualities. I am saying As a major petro-based, commuter fuel substitute it's absolutely moronic, but thats another discussion for another thread. I'm also saying that it will cause problems and headaches not found when using traditional race fuels. |
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09-15-2008, 06:28 PM | #452 | |
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09-17-2008, 08:41 PM | #454 |
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72 lb/min injectors convert to about 755 cc/min using the conversion factor of 10.5 cc/min to every lb/min.
At that flow rate and for an average duty cycle, you will be fine for supporting the 2871. Now the guys here with actual injector duty cycle datalogging experience during tuning sessions would be able to tell you exact numbers with boost levels/engine loading etc. IIRC, top feed injectors will need an aftermarket fuel rail, not sure if the OEM can be modified to accommodate. Enjoy the turb! |
09-18-2008, 11:59 AM | #455 | ||
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72lbers are plenty for 2871r cars, and even most 30r guys. And as you stated, they will require a top feed fuel rail. Remember, with MSD 72lbers you will need to use resisters for proper impedence. Not a big deal, but just a must. FWIW: RC now offers larger 72lbers in the correct impedence for us as well. Quote:
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09-18-2008, 12:17 PM | #456 |
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does anyone have any input on GT3076 (T25 style flange w/ internal wastegate) compared to the GT2871. I just sold my S13 to a friend and built the motor with a T25 flanged GT3076 .63ar. It pulls good, but it's only on stock cams and running 7 psi because of boost controller issues at the moment.
I now have an S14 project and am thinking about using the 2871 for it. Just wanted to know if anyone has used the very uncommon T25 flanged 3076 |
09-18-2008, 01:30 PM | #457 | |
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Let me say this about his setup; never having personally felt the power from a properly tuned 2871 on a redtop and only having a T28 @ 16 psi on mine, his 3076 @ 23 psi was SCARY quick . From my short experience in his S14, full boost came on by 4000 or before (can't remember tach was moving too quick) and never stopped until he shut it down at somewhere around I dunno 120 or so. |
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09-18-2008, 03:09 PM | #458 |
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I really don't like the idea of the 3076 on a t2 based setup. Seems very unbalanced, and almost to much little flow to take advantage of it.
The 2871r .64 is the perfect street T2 based turbo. If you want more power, go top mount and take it's advantages along with the 30r for some big boy power.
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09-18-2008, 05:31 PM | #460 |
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i have one on my sr. only running 10-14 psi the avc-r wasnt set up completely. YouTube - IDAHOTUNER 130? MPH 240sx sr20det gt2871r .64
this was before the suspension was softend up to make it bearable.
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09-18-2008, 09:45 PM | #461 |
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Just got back from my tune on e85. Good jesus!
Redtop, GT2871R .64, 740cc, Tomei 256 poncams, PFC and all the normal bolt ons. At 20psi: 383whp 373wtq At 4000rpm I am making just shy of 360wtq. Previous #'s on 91 octane pump at 15psi were 311whp and 290wtq. I'll post up my sheet later tonight. |
09-19-2008, 12:01 AM | #462 |
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that is awesome man. great numbers.
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09-19-2008, 12:04 AM | #463 |
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Been a good bit now since I got dynoed and I've blew my motor up....Don't ask long story, but back on Feb 20th of this year I dynoed 337whp/295wtq on 17lbs with an 11.2 afr across the board on 93 octane pump gas.
my setup was GT2871R .64a/r S13 SR Redtop Brian Crower 264cams Brian Crower Valve springs and Ti Retainers Cometic headgasket ARP HeadStuds Adjustable FPR STI 550CC injectors Z32 MAF Stock intake and exhaust mani stock turbo elbow 3" dp and exhaust FMIC etc... |
09-19-2008, 12:05 AM | #464 |
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those are high numbers! where's the dyno sheet? What dyno was this on? (1cleans13)
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09-19-2008, 12:16 AM | #465 | |
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Quote:
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09-19-2008, 01:16 AM | #466 | |
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I'll list my specs again for reference: Redtop - stock internals & headgasket GT2871R .64 740cc Tomei's Tomei 256/256 Poncams Z32 MAF HKS FMIC HKS SSQV Greddy Turbo Elbow Blitz Downpipe Megan Test Pipe Apexi GT Spec Exhaust Stock intake & exhaust manifolds P2M RAS Walbro 255lph Koyo Rad + FAL Electric Fans R32 VLSD Competition Clutch Street Disc + 11lb Flywheel Power FC tuned on E85 @ 20psi Best of all, daily driven w/AC + PS Last edited by 1cleanS13; 09-21-2008 at 10:51 PM.. |
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09-19-2008, 02:00 PM | #467 |
Leaky Injector
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This was 3rd gear run. 4th gear was 360. Does my tq seem low?
rods pistons 8.5/1 .5mm over bc stage II 264 in/ex cams springs retainers RAS greddy IM gt2871r .64 740cc injectors enthalpy tune z32 maf |
09-22-2008, 08:28 AM | #468 | |
Zilvia FREAK!
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Quote:
Was this an S13 or S14 SR ?
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09-22-2008, 05:44 PM | #469 |
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What is your base timing set at? Maybe those BC cams need a bit of degreeing to get them to make some good power?
Damn you and your E85! Great torque numbers man, i'm so glad to finally see some more serious 2871r cars coming around
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09-22-2008, 06:16 PM | #471 |
Zilvia Junkie
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oh yeah? where is your proof?
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09-22-2008, 06:36 PM | #472 |
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09-22-2008, 10:25 PM | #473 | |
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I looked thru this entire thread and still can't find another SR dyno with similar mods (which I consider mine are pretty mild) making the insane torque mine made. I dunno if its the E85 or what, but almost 360wtq at about 4-4100 is crazy! I can't wait to get some slicks and hit up the 1/4 for shits and giggles. I'm guessing mid/high 11s. Full interior, AC, PS and stereo system |
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09-23-2008, 11:08 AM | #476 |
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Osmo...buddy of mine warned me against using BC cams simply because of how much adjustment he had to make with cam gears to get them back within spec after he installed them. I remember him saying they were on the order of a double digits worth of degrees off just on the intake side. Try searching some on here for others who might have had the same problem with BC cams. We want to see over 300 ft lb next time you post!
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09-23-2008, 11:24 AM | #477 | |
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The s13 is pretty much where I want it. I never wanted to get that extreme with it. Just some crazy rims on stock body and a decent motor set up. I'll still drive it a few times a week. |
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09-23-2008, 11:24 AM | #478 |
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Just for my own comparison.-- How does a gt28rs compare to the gt2871?-- I have an RS and im wanting around 325hp and not much more than a bar of boost. From what i can tell the 2871 is capable of more HP than a RS they are just built differently. Any ideas??
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09-23-2008, 01:27 PM | #479 | ||||
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The big thing I gotta stress though is proper cam selection. Ironic how you and I have quality aftermarket cams (Tomei and JWT) and we both make Mack Truck torque (well, ya know haha). Good parts will always make good power with the least amount of concern. You and I have pretty 'basic' cars, and both make good power. You always could be making some of that torque through tuning on the e85. It resists detonation more than pump gas, thus allowing a 'bit' more timing to be jammed in. Quote:
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One advantage of the 28RS IMO is that it has slightly better 'off throttle' response, but not much. The disco potato is THE perfect FWD street car turbo. For kicks: My cars graphed overlayed on my buddies Sentra graph His Sentra: 28RS .86, extrude honed. GTiR manifold (extrude and swain), 40mm gate welded on. GTiR J pipe (extruded) and 3" exhaust. S3 cams, stock manifold, 50lb/cobra maf program, etc etc.
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09-23-2008, 01:58 PM | #480 |
Leaky Injector
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A smidge off topic but we dynoed my friends s14 with blacktop. He made 272whp and not to positive on the torque but it was made on a 28rs on 15psi with a v-mount set up. It just has a downpipe back exhaust and blitz sus intake. Stock fpr, stock 370's, stock ecu getting as rich is 9.3:1 at a few points!!! Not too bad for 5,200 ft. elevation.
We recently put on a gt2871r with the .64 and is to be getting dynoed soon and tuned finally. |
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