Jump to content
SAU Community

Recommended Posts

My money is on gtsboy

This. I half wanted to weigh in here too, but I'm sticking to my "Try not to care too much about forum conversations" pledge and he has a habit of saying things I am thinking anyway so I get the enjoyment of it without the frustration of writing lots of stuff and finding a lot of it falls on deaf ears, or gets recycled and then regurgitated back to you as though you are being taught something so this works much better for me :)

The whole way this started was comparing like setups anyway, its going kind of off topic anyway - we end up down a path of levels of extrapolation in the comparison getting bigger and bigger and it reaches a point where we may as well say "BLARH my Dad is bigger than yours". If no one else does I'll try and collect some useful data on the SS2 when I get into tuning it.... I kind of wish I still had GT3076R log data on hand, but either way its clear than the boost threshold difference is probably trivial which makes the SS2 a good thing, again because of how convenient it is price and bolt-on wise.

  • Like 1

Yo Lithium, logs attached!

Looks like I get:

1.1bar at ~3600rpm

1.5bar at ~4300rpm

However like I said earlier, my gain is set pretty low

Also here's a virtual dyno print out, not sure how accurate this is either lol

post-22311-0-20871300-1411045124_thumb.png

9-18-2014_2011.xlsx

  • Like 1

Awesome, good data sir! Will check out the xlsx when I get to a computer but that gives a good idea. Very very similar to a GT3076R, solid looking power too :) I know VD had issues with MAP in he past, I assume it still does but still... seeing 3.6 bar on the pressure plot for a stock 25 makes my eyes water haha.

Just confirming, is externally gated?

Cheers for sharing :)

Of course you can!

Just download it, choose the right car/tyre settings and upload your logs.

You'll need to trim the logs though so it's only one WOT run in 3rd or 4th. I tried to upload an entire log and it turned out like a mess lol

I think the 2 conflicting examples of spool of E85 vs petrol goes to the heart of the matter. I am no expert but I thought I'd put my musing in here.

I'm assuming it does indeed come down to heat in the exhaust flow which comes down to comparative AFR during spooling. If tune E85 and petrol to the same lambda during spool then the extra E85 mass at a given lambda will reduce heat in the exhaust compared to the petrol tune and reduce spool. If you tune E85 to a bit leaner during spool then this effect will be minimised and perhaps even allow E85 to bring on boost sooner due to the greater power & heat generated. Since E85 gives a wide sweetspot for MBT then it does allow it to be a bit leaner during ramping up without affecting timing.

^^ This is probably very true.

If you take the freedoms given to you by E85 and run with them, you will almost certainly be able to overcome the cooler exhaust effect.

The reason I said I wasn't going to do the math is that I was sitting in San Fransisco Airport United Lounge between a 6 hour trans con flight and a 15 hour trans Pacific flight. Simply wasn't interested in anything that even seemed remotely like the work I had been doing for the previous 3 weeks. Now that I'm home, and not going to the office this weekend or Monday, I'm still not interested.

Maybe later.

I'm thinking better torque timing in the spool phase but injector performance would play a part here . A big old world injector won't react or probably atomize as well as a modern one so being rich here is probably safer overall .

Ill tell you this

My tune with the ss2

98 = ~355whp @ ~18-22 psi

85 = ~345whp @ 16 psi

The 85 tune has alot more midrange, comes on power alot harder.

Its also faster...proven at racewars.

Ill tell you this

My tune with the ss2

98 = ~355whp @ ~18-22 psi

85 = ~345whp @ 16 psi

The 85 tune has alot more midrange, comes on power alot harder.

Its also faster...proven at racewars.

Do you have the torque graphs? I would be interested to see your torque gains running similar power output, on the same turbo.

Updates on the GTR. 130KMs drive to see Brandon at Brae fabrications. It is now now high mount installed, running one of our 50mm external gate.

car.JPG

enginebaystock.JPG

manifold1.JPG

manifold3.JPG

manifoldback.JPG

Don't know if this is a N1 GTR. Factory turbochargers removed are busing bearing N1s with steel turbine wheels. That explained all the extra power.

stockturbo.JPG

Turbocharger used for this evaluation is our latest billet SL20.5

front.jpg

turboinstalled.JPG

I've heard few people mentioning that the Rb26dett engines are laggier at spooling up the same turbocharger as if it is installed on a Rb25det due to the lack of VCT unit. It didn't feels like the case. Be interested to see what the dyno says and comparison against standard Rb25dets using the same turbocharger on similar setups.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now



  • Similar Content

  • Latest Posts

    • I've heard the Tomei USA head gaskets are decent if you want to o-ring the heads but otherwise not recommended.
    • The 296mm rotors are the R33 turbo brakes. The 310mm rotors are the R34 turbo brakes. The calipers are nearly the same, but not. They're the same caliper but the R34 caliper has longer legs so that it sits out far enough to go over the rotor. The pads are the same for both. When you say, "I bough tsome EBC"....did you just mean pads? Or rotors? 310mm rotors fit under 17" wheels. There may be some wheels without enough clearance though. I can't fit my fingers between the barrel of my wheel and the "corners" of my R34 calipers, but there is plenty of room behind the spokes. This is on Enkei RPF1. You can fit 324mm rotors inside a 17" wheel, but I'd be willing to bet that it would be close to impossible with the Nissan/Sumitomo caliper (using an adapter, of course), because the Sumitomo caliper is fatter than the Brembo caliper that is supposed to go on the 324mm rotors.
    • Hi. Can someone tell me what brakes(and mainly WHERE) can i buy brakes on R34 GTT? I bought some EBC which SHOULD go on my car(i have GT but it has GTT brakes) but it does not fit, Brakes are "too" small(296mm) Are 310mm be good or? I have 17 inch wheel so no "big boys" but for me driving i just need one that fits and i can get here in EU/Czech.
    • Since winter isn't that harsh anymore in Poland, i will definetely drive it 365 days a year 😉. But if the snow hits i will try it for sure and let U know. Only swap i am planning to do is of course R34 GTR front 😍.
    • Hey. Very valuable information about pitwork, I will pay attention when buying any consumable parts 🙏 As for the carpets - I got a handful of information from nengun, from which it appears that indeed the carpets for the driver's side are OEM. They are not able to show me any pictures due to the long chain of different sales entities but after I place the order, as soon as the goods arrive at the nengun warehouse from which they will send the shipment to me they can send me photos and if my purchase differs from OEM I can immediately return it / cancel the purchase. I think I will give it a try 😉. Of course i'll let you know what's what as soon as i get them P.s. I know the topic is not relevant to the thread, but both nengun and amayama have these SICK 😍 trunk room lamps available. Do you know anyone who ordered them? I need to have one in my car
×
×
  • Create New...