Which should I go with GTX2863, 2530, or 2860-5

[frakzz]

said they need to run over 1000 km without boost

[No Crust Racing]

Well I'll give you one thing, you;re not wasting any time.

I don't think new turbos need a break in period, they either work or they dont. 

Post results when you have them

 

[Mick_o]

What Dan said^^^ 

Turbo's dont need a run in. Just make sure you unplug your coil packs and turn the motor over for a while to push the oil through to the bearings so they don't spin up dry when the car is started ?

[frakzz]

presetting aem

sard 800cc
1.7 = inj duty 64% (hks 2510)  1bar (34%)
1.2 = inj duty 80% (gtx2860) 1bar (45%)

gtx2860
2500 0.22 
3000 0.36 
3500 0.56 
4000 0.76 
4500 0.9 
5000 1.07 
5500 1.15 
5600 1.2 
6000 1.2 
6000 1.26 

hks 2510
2800 0.3 
3400 0.5 
4000 0.7 
4500 1 
5300 1.5 
6100 1.7

slightly larger lag on sensations
Need a slit gear that reduces the lag
  advance intake and exhaust => more low-RPM power, less high-RPM power

[frakzz]

3500 rpm begins to feel boost

 

2510

gtx28

Edited October 9, 2017 by frakzz

[No Crust Racing]

Cool story. 

 

Show us a dyno graph of each with power/boost. 

 

[Dose Pipe Sutututu]

1.2bar at 5600rpm.. That's not really remarkable to be honest.

[Mick_o]

Ohhhh dear! Is this where i say i told you so??? ?

[Dose Pipe Sutututu]

When a basic Hypergear turbo, low mounted on a stock modded manifold is making 1.8bar at 4200rpm you start to wonder

[discopotato03]

I thought it was by now ancient history , the GTRS was a better replacement for the "GT2540R" and ditto the GTSS (-9) for the "GT2510R" . None of these are perfect but the -9 sounds pretty good for the power it was intended for .

The inaptly named GT2530R is really what's now known as a GT2860R with a specific 63 trim compressor wheel .

GTR twins are a PITA with late GTX compressor wheels because they were designed to work with a port shrouded compressor housing . 

The Holy Grail is probably a single twin scroll EFR and at a guess the 7670 would please most sane users .

Has anyone ever used one on the rare HKS cast low mount 26 manifold ? 

[Lithium]

11 hours ago, discopotato03 said:

I thought it was by now ancient history , the GTRS was a better replacement for the "GT2540R" and ditto the GTSS (-9) for the "GT2510R" . None of these are perfect but the -9 sounds pretty good for the power it was intended for .

The inaptly named GT2530R is really what's now known as a GT2860R with a specific 63 trim compressor wheel .

GTR twins are a PITA with late GTX compressor wheels because they were designed to work with a port shrouded compressor housing . 

The Holy Grail is probably a single twin scroll EFR and at a guess the 7670 would please most sane users .

Has anyone ever used one on the rare HKS cast low mount 26 manifold ? 

Not that I know of, however a lad I know is currently doing an EFR7670 with the .92a/r twin scroll hotside on a tubular twin scroll manifold on an RB26 with basic cam upgrade... was running N1 turbos previously.

[frakzz]

in the winter I will do porting, adjust the split gears, will put 272 shafts, then go to dyno

[Mick_o]

19 minutes ago, frakzz said:

in the winter I will do porting, adjust the split gears, will put 272 shafts, then go to dyno

So you aren't going to share the current results? 

[r32-25t]

No one ever shows a result that makes them wrong or if they do they fudge it to make them look like the hero 

[Dose Pipe Sutututu]

The only time I think twins would truly work is if they were both mounted on proper manifolds, externally gated x2, intercooler x2, plenum x2 (1-3 & 4-6). That way there's no turbulence or turbos "fighting" to push into one cooler pipe/core.

By that time, effort and money you're better off with a big fat modern twin scroll single.

[No Crust Racing]

272 cams are a very poor match for that combo, just sayin... 

[GD51LA]

-5s! while there maybe some newer tech out there these are proven too work well, 330-370 dependent on health and supporting mods
had them on 34 gtr, no real lag (as reving past 5k was always the case

[frakzz]

On 16.10.2017 at 3:26 AM, ActionDan said:

272 cams are a very poor match for that combo, just sayin... 

Which shafts are better?

[No Crust Racing]

What is your goal?

The turbo combo had already made the car a little more laggy.

Adding big cams will make that worse, and to be clear 272 cams on a stock 2.6L is a big cam.

Testing shows nothing beats the stock cams for response (248) but that you can gain a bit of midrange without sacrificing too much response with Tomei type R or type A (250 and 256).

Duration is only a small part of it though, lift will help response and bigger lift needs valve springs. Ramp rate will also help it feel not as lazy, but aggressive ramp needs valve springs as well.

I used Kelford 264 after reading lots of reviews about the Tomei having soft ramp rates.

I've got strong torque from just under 4k rpm to redline, but my car has a few other mods to help and I run e85.

I'd suggest you talk to Kelford Cams, Camtech or Clive Cams about your whole setup, current results and your desired goals.

[frakzz]

solenoid rsp 100%, ofs 100% (Full boost)

3000, os 12.6, boost 0.3, ign 35
3500, os 12.12, boost 0.5, ign 32
4000, os 12.24 boost 0.7, ign 27
4500, os 11.44 boost 0.84, ign 25
5000, os 11.44, boost 1.01, ign 23
5500, os 11.55, boost 1.17, ign 21
6000, os 11.27, boost 1.26, ign 20
6500, os 10.75, boost 1.29, ign 18
7000, os 10.35, boost 1.25, ign 19
7300, os 9.8, boost 1.33, ign 18

rb26 can not rotate these turbines anymore. What can I do to fix this?