Opinions On My Tune Gtx3076

[scotty nm35]

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?

The cheapest option for more aggressive power is to fix the issues you have currently, this should be a wild ride already but it looks to be very flat. Can you get pictures of various parts starting with the rear housing and wastegate/controller setup? 5k is very late for that boost, I had 20psi by 4k on my GTX3076 .82.

It almost sounds like you have a boost leak, have you had your intake plugged and pressure tested?

With the Tial you can run multiple springs and now the low end is tuned you should be able to get the gate to hold 18psi using the 11 and 7psi springs, that should help a little. Who welded the vband to the rear housing? Did they make sure it didn't warp?

[wolverine]

^^ agreed, get the most of the gear you have before you spend on replacing/changing parts.

[Mitcho_7]

Could a restriction somewhere be causing the slow boost pick up?

[scotty nm35]

Of course, a blocked cat/collapsed muffler would make it very flat also but dropping the exhaust is the first thing I would have done, while it was still on the dyno.

What is the intake like?

[AngryRB]

The cheapest option for more aggressive power is to fix the issues you have currently, this should be a wild ride already but it looks to be very flat. Can you get pictures of various parts starting with the rear housing and wastegate/controller setup? 5k is very late for that boost, I had 20psi by 4k on my GTX3076 .82.

It almost sounds like you have a boost leak, have you had your intake plugged and pressure tested?

With the Tial you can run multiple springs and now the low end is tuned you should be able to get the gate to hold 18psi using the 11 and 7psi springs, that should help a little. Who welded the vband to the rear housing? Did they make sure it didn't warp?

the intake pipe was done by myself, welded a 45degree 4inch pipe to a 3inch reducer and hasnt been tested, it does have a very lumpy idle and slight jerking at 2000rpm which the tuner says its the cams after playing around with fuel and ignition at those points,

ERD welded the external pipe to the housing, it must be a 11psi spring in there cause low setting is 0.85 and high is 1.2bar

[AngryRB]

the only part of the exhaust that hasnt been taken off/replaced is the resonator, it was a 3 1/2inch jap catback, i took off the silencer muffler and put on xforce 3inch, and custom dump by ERD and 100cell cat from ERD too, looks 3 1/2inch too

but it was easily gaining kw's with each degree of timing , like 7kw each degree so dont think the resonator would be holding it back, but maybe.

[scotty nm35]

I guess if the setup is fine and it's just that the compression is too high then a quick tune on E85 would prove it.

That way you would have both maps also so you could swap between them.

[AngryRB]

so that means buying more injectors and pump doesnt it?

was reading mafia's water/meth thread, he managed to increase the timing like 7degrees more, so that would be a solid 40kw's plus and only need a small tank of it compared to a full tank of E85, seems like a win win situation,

maybe tune on water/meth with 20-22psi and hope for a solid 320kw ( stock internals ) , hopefully the boost would come on atleast 500rpm sooner and quicker..

[GTScotT]

Ive only had a quick gander here, but i get the feeling the issue is more pressure in the exhaust than there is the intake.

youve hung the gate off the housing so it cant possibly be that, its more likely to be the flow character of the accumulation of parts.

be it myself, id run a few tests looking for leaks or restrictions but then id probably tap a hole into the exhaust somewhere (probably the spacer plate between the turbo and manifold) then see what sort of pressure ur getting out of there. I bet theres more pressure pre turbine than there is in the intake by a long shot.

if thats what id found, id be ordering a highmount with no gate port and modding the gate pipe angle off that rear housing.

[AngryRB]

Ive only had a quick gander here, but i get the feeling the issue is more pressure in the exhaust than there is the intake.

youve hung the gate off the housing so it cant possibly be that, its more likely to be the flow character of the accumulation of parts.

be it myself, id run a few tests looking for leaks or restrictions but then id probably tap a hole into the exhaust somewhere (probably the spacer plate between the turbo and manifold) then see what sort of pressure ur getting out of there. I bet theres more pressure pre turbine than there is in the intake by a long shot.

if thats what id found, id be ordering a highmount with no gate port and modding the gate pipe angle off that rear housing.

Had to read this 3times to understand , i think your saying the exhaust manifold is restricting the turbo from boosting properly is that right?

if the engine didnt have carbon in it it maybe have made 290ish which would of been closer to normal wouldnt it? but doesnt explain the slow boost curve.

Edited June 11, 2012 by SliverS2

[scotty nm35]

but doesnt explain the slow boost curve.

That's the main issue, are you sure its coming on that late? You should be able to spin up a gt35 before that... Find a big hill and ramp 4th gear up it with someone else watching the boost? First and second will always take longer to spool.

[AngryRB]

well i can feel the the car starting to pull a bit even low down, even off boost its not that sluggish if you know what i mean, its just so smooth rather than breaking loose at the rear that i expected with a gt30 and 280ish kw,

really needs like 4500rpm and 5000rpm to really wake up, second wakes up about 4500rpm with going sideways a bit but like i said, its not as crazy as i think it should be, the tuner also said its good but it a bit of a late turbo.

[scotty nm35]

Considering the compressor can probably flow 400kw of course it will be late coming on, but it should still be hitting 20psi by around 4k with the .82. There are countless reasons it may be late spooling but if you work through them you should be able to achieve that. Don't drop back to the .63, you are better off swapping the whole turbo for a gt3071 imo If you feel its too laggy.

[AngryRB]

4000rpm would be ok if it got crazy , i think ill try replacing the resonator, all the clamps with heavy duty ones, adjust boost controller, then water/meth...

if im only after 320kw should i replace the compressor with the gt compressor???

[AngryRB]

have a short video of the dyno when it made 260kw if it helps any lol http://youtu.be/j8_WSDNQX6Q

[WYTSKY]

the pics you have of your gate look identical to mine.

I know exactly how you feel - when I first got the car tuned I thought it would be an absolute monster and you'd get that massive kick in the guts.

It wasn't, it felt very progressive - very useable power, but not that holy sh*t feeling I was after. I was keen on response so went the .63

this is it here using the gate with a 15psi spring and a simple bleed valve ...

then I went back with just a gizzmo ms-ibc and it made a massive difference. 3 grand full boost. in first it hits probably about 4,200-4,500 (so quick can't even watch it) second about 4... etc....

- comparing to yours you can see the .82 housing really making a difference in the top end where mine starts choking. But compare a kw figure... ie 140kws on yours takes to about 4100, vs about 3400 on mine, thats where the lower torque starts pushing you back in the seat.

with 20-21psi on the above dyno I got 296kw with a little detonation so I asked to take it back to 18-19.

It still isn't that lightswitch power but it is actually faster then others with those on/off turbo setups... more area under the curve is more power for tarmac.

I know you have the bigger exhaust housing but it still looks a little lazy. I also noticed on your second post up of your boost that it looks a little wavy, that could be the result of an issue?

I have also considered water meth, spoke to mafia as there is no e85 around this side of Melbourne yet. I would do it but at the moment the car is my daily and there are more important things going on, but when I want more power i'll be going straight to that.

[Don Dada]

Are you using a single spring in the gate?

I suggest upping low boost to 1bar using a combination of two springs, as tial recommends two springs for this size turbo....This should definitely bring on boost earlier

At what rpm was the 285kw made?....I hate speed based graphs

[AngryRB]

thats a dam good power curve, you have like 45kws more at 4000rpm

i think ill play with the boost controller tomorrow to see if it can be brought on earlier, seems like such a big job and $$ to go to a 0.63, maybe the GTX just needs alot more boost and water/meth to kick it up the arse...

[AngryRB]

Are you using a single spring in the gate?

I suggest upping low boost to 1bar using a combination of two springs, as tial recommends two springs for this size turbo....This should definitely bring on boost earlier

At what rpm was the 285kw made?....I hate speed based graphs

it would be 6600rpm, what springs would you use then? theres some big diameter springs and narrow ones in the box, i think theres only one in the tial, i didnt put them in myself but the tuner must of used one id say.

[AngryRB]

if there is a lot of carbon build up,( stock computer with R&R for 170 000kms) then would this be enough that the timing had to be wound back say 2-3degrees? and would that mean less power and response in the whole rev range? cause that would make sense, but if others are making 300kw with 18psi how clean would there motors be?

Edited June 11, 2012 by SliverS2