Opinions On My Tune Gtx3076

[AngryRB]

Car was tuned today, mods are in sig, The spring used was not enough to go above 15psi so will have to return next thursday to up the boost to 18psi

On the road it pulls hard once it hits the midrange, after being used to 200kw, its taking a bit to get used to lol. Hopefully with 18psi it will see 290-300kw.

whats peoples opinions?

[scotty nm35]

Tell them to turn the smoothing down, it looks like its wound right up.

With 19-20psi you should get around 300, I made 335 at around 19psi on e85 with the 76.

[AngryRB]

what is smoothing? it was responding well to boost, started at 210kw at like 10psi, then 250with 14psi so seems a good gain from a few psi,

600NM of torque is pretty good with 15psi ?? its very smooth delivery though, was hoping for a bit more anger in its delivery.

[Don Dada]

Looks good so far.

Put a 1bar spring in the gate, it will bring it on faster and give your controller less work to do

Oh...and next time get rpm on the sheet pls

Edited May 31, 2012 by Don Dada

[AngryRB]

yeah i asked about that, i dont think that dyno is set up for it and was going to be a hassle to adjust, but 120kph is about 3800rpm ,

I bought the wastgate second hand so all i have is a box of springs that arnt labelled, gate was too hot to do a swap.

Edited May 31, 2012 by SliverS2

[AngryRB]

Went back today for some more boost, amazing what a few psi can do, the car is alot more responsive and fries the rears with ease in second gear, lol

Apparently it wouldnt handle too much timing compared to others so maybe some carbon build up in the motor , i was hoping for an easy 300kw but im very happy with how it drives.

Edited June 7, 2012 by SliverS2

[scotty nm35]

Needs moar boost, get some ethanol or water/meth into it.

[AngryRB]

yeah i know, it reacted so well to just 3psi, maybe for xmas ill get E85

[AngryRB]

after opinions on wether it would be good idea to go down to a 0.63housing and add meth injection, the power seems a little bit late and not aggressive enough, did i just select the wrong turbo? or is E85 my answer, i dont really want to sacrifice reliability or rebuild the engine, just after more aggressive power and to hit the 300kw mark..

[methz]

on that boost u should be hitting around 290-300kw from a normal 3076r... with a gtx well your power is fairly average.. i dont think its the turbo causing problems...

[KiwiRS4T]

Have you tried more boost?

[wolverine]

Wrong turbo if you want aggresive power IMO.

Maybe 0.63 and E85 will liven it up but what is the point of the GTX compressor then?

Still waiting to see a result from a GTX that seems a step up from what was already available.

[Mitcho_7]

What rpm are you hitting full boost on? I'm on my phone at the moment so I can't really see the graphs that well...

Wmi/e85 if you can get it could be worth a try, but is that going to give you more response which I assume is what you are after? The .63 rear and e85/wmi will keep you up around the same sort of top end I would think but I'm no expert.

I remember reading about Matt from nistune' r34 gtt making around 290rwkw or possibly more running a gtx3071 in .63 on pulp with poncams.

The thread is over on the nistune forums, but from what i remember reading his car has always made more power than expected from the mods he did.

Edited June 10, 2012 by Mitcho_7

[Dale FZ1]

The .63 rear and e85/wmi will keep you up around the same sort of top end I would think but I'm no expert.

I experienced Mafia's 0.63 + WMI setup. Stronger than mine with 0.87 on pump 98 from 3-4000, but also you could feel the torque rolling off above 6200-ish where mine with the larger housing kept pulling to 7200.

Honestly IMO this result with a 0.8 housing on GT30xx at 19psi is entirely respectable and typical of what power figure to expect. +10kW would be nice but it's within range. The whole GT/GTX thing isn't worth wasting time on. Flow maps shows that the GTX only has a flow advantage at higher PR (boost).

For a more "aggressive" delivery simply lift the head and turbo setup, and install on a RB30 bottom end. Much more impressive day-to-day.

Alternatively, check the existing setup over for integrity, and wind boost up to 22-24psi with the controller setup for the most aggressive rate of boost build that you can. If it fries tyres now, then your local fitters will be seeing you on a monthly basis after that.

Can I suggest forget chasing more power, more power, and target more traction/drive with what you have?

[scotty nm35]

after opinions on wether it would be good idea to go down to a 0.63housing and add meth injection, the power seems a little bit late and not aggressive enough, did i just select the wrong turbo? or is E85 my answer, i dont really want to sacrifice reliability or rebuild the engine, just after more aggressive power and to hit the 300kw mark..

Is yours internal or external gate? Perhaps the wastegate isn't set up correctly or doesn't have enough spring to hold back the manifold pressure? That would make it come on very slow and progressively build boost like on your graph.

[Mitcho_7]

Is yours internal or external gate?

Pretty sure it's external gate

[scotty nm35]

If it is, do you have a mac valve? You need to feed boost pressure onto the top port on the wastegate until your controller switches it to the lower port. Which spring did you get and what is the lowest boost pressure you can run?

[AngryRB]

Have you tried more boost?

KiwiRS4T-The tuner said that he has reached the limits on the 98fuel, he added just one degree more timing and it went from 278 to 285 but he said the knock was climbing too much so for safety he took it back a degree to 278, also said there might be some carbon build up inside because some rb25's can put more timing into them.

Mitcho_7- full boost looks like 4400rpm 18psi, but when its set to 15psi it takes till like 5000rpm to get there,

DaleFZ1- I wouldnt mind rebuilding a strong Rb30 bottem end if it were straight forward swap but reading the rb30/25 looks like it gets expensive very quick.

Scotty- Its external gate, 44mm tial comming off exhaust housing, The tuner set it up, it has one hose going in top and one hose at the bottem, looks like theres heaps of duty to bring it on early, will double check though

The tuner tried all the springs like 5 of them, the low boost setting is .8bar so whatever that spring is .

What would be best/cheapist option for earlier and more aggressive response/power? RB30bottem end? water meth?E85? Housing swap? low mount aftermarket exhaust manifold?

Edited June 10, 2012 by SliverS2

[AngryRB]

Also the boost controller has high setting of 1.2bar and a flat duty cycle of 67%,

should i raise this to 90% for the first 3000rpm, maybe that will make a difference?

[Mitcho_7]

KiwiRS4T-The tuner said there might be some carbon build up inside because some rb25's can put more timing into them.

WMI can help with cleaning that off from what i have seen and as an added bonus you get more power!

If you go WMI, keep a copy of your current tune so you can revert back to it later on if you decide to ditch the WMI. That way you dont have to pay for another tune.

Edited June 11, 2012 by Mitcho_7