Harey

The wavy part is just certain type of dynos do that I understand. Yeah the poor boost control would be the china manifold. So strange with a quality 2530 engine build with all the good stuff and a nice GT35R and then a cheap ebay china exhaust manifold??

Exactly, thats how it is setup from nissan.

Yeah I know what your saying Tangles, the return flow intercooler seems to drop 10-20rwkw on the setups I have seen. I have had a trust return flow intercooler, then I spent a few bucks on a return flow ARC intercooler. Found it more responsive and Trent said the temps are really good and dont move after continuous dyno runs but it still makes 20rwkw less than the exact same turbo on Staos car with a non return flow intercooler. This power difference was consistent with 2 different turbos that both Stao and I ran. Even the cheaper non return flow intercoolers seem to do quite well from a boost dropping and peak power point of view. Its such a pity cause I have a big focus on having it look standard for the popo

Zero known problems with a factory turbo and only ever 13-14psi. You have now installed a new turbo, new piping, run a higher boost level then ever before. There are countless people that have issues when they first fit a larger turbo. You need to work through these and then you can chuck on whatever turbo you want and get the result you expect. Such problems are intake piping, intercooler piping, intercooler performance, exhaust restrictions, slipping clutch etc.

+1 to this. I have just dropped my car off before at a tuners and picked it up after they closed. Even good tuners will just tune the car as is. If there is a mechanical problem (incorrect sensor, boost leak etc) they will not troubleshoot this as technically you have just asked them for a tune as is. My current tuner is excellent and is happy for you to be there while they tune it. That way when he finds a problem you can help troubleshoot and put importance on finding the fix. Then you can either say look stop the tuning there I will fix the problem and come back or can you please try this. Some tuners wont like you being there, one solution to this is make sure you come down within their opening hours and ask to take the car for a drive before you pay. Then if you find anything tell them straight away, either get them to come with you or get them to drive it in that situation. Repeat this and I know you cant cover everything for example cold start etc. If you discover something else then call them and discuss the issue and bring it back. Most tuners will happily work with you if you have a problem you can show them with the tune but most are forced to keep moving through cars as quickly as possible. It can also be good to tell them what power to expect. You can say if it doesnt make 250kw give me a call and stop the tuning cause something is wrong. Tuning is such a tricky business cause what if they guy spent 20 hours troubleshooting, fixed all the issues, made a solid 250rwkw and then charged you $3k would you be happy then? Prob not. Yeah I know the easy answer is for them to call you and discuss the result but unfortunately it never seems to happen. This is especially the case when you have quite a lot of changes, if you are confident with your setup and are just changing one thing then you can probably just leave them to it. But my advice is work with them as much as possible, tell them what you expect, test it before you pay and take it back when you discover a problem afterwards.

Yup point was though its not a "turbo" back exhaust Exactly, its a sport wagon not a street dragging weapon (in most cases).

+2 to Nismoid and Wolverine to fit custom straight through mufflers as large as you can fit. I also had an 18" x 12" x 8" muffler fitted to the rear of my 34 (3.5" in and out). Its bloody massive but fitted and tucked up in there nicely. Car is super quiet but still sounds good and made good power.

I thought 350Z's had an N/A V6? No offence to the stagea crowd, there are some quick ones around but I am not sure about its selection if you want to beat everything on the road. I see them as a very practical road cars with some decent acceleration and handling.

Geeze mate you have had a rough run there! There is bugger all lag with a stock turbo or an SS1! If you think thats laggy try a bigger turbo. Seems a waste to have awd but a clutch that cant handle any sort of torque. I wonder if your clutch is slipping even under full throttle acceleration in any gear?? I would be replacing the clutch before anyone else tries to tune it.

Yup but your A20/35 would have only weighed 900kg whereas your stagea would weigh 1700kg.

Make sure the cat is 100 cell. If the xforce one is not, get a venom 100 cell cat.

The SS1 does feel like a standard turbo on 20psi if it was efficient and safe there. What made you choose the SS1? Have you driven many small engine turbo jap cars before?

Maybe not double haha but a big improvement to even a modded stock turbo eg:

Something sounds wrong there, mines silky smooth. What power were you making stock? Stock they are like 140-150rwkw. 230rwkw should feel like a big difference.

At 4,000rpm (~110km/h) yours is making 205rwhp and mine 214rwhp. 9rwhp difference At 5,000rpm (~135km/h) yours is making 280rwhp and mine 295rwhp. 15rwhp At 6,000rpm (~160km/h) yours is making 300rwhp and mine 320rwhp. 20rwhp So you can see as the revs rise the restriction has more of an impact. But its not a massive difference either.

And this is after the exhaust mods and the new intercooler, as you can see now I can hold over 17psi to redline (no boost controller). It doesnt make a tonne more power but def feels better. Also my boost is fairly flat up till about 5,500rpm where it drops quite a bit and then flattens out again. Yours is a linear drop straight from where it hits full boost! You can change the turbo to whatever you want but you will still have issues until you sort the issue/s out.

Wow that boost is dropping straight away, something is restricting it. 230rwkw is a bit low for this turbo. Take a look at mine, we did a test before the intercooler as well, as you can see the intercooler was restricting mine. The difference gets towards 5psi as the revs increase. Even with those things sorted I couldnt break 250rwkw so your not that far off either. Its a small super responsive turbo.

Nismo only come in 480cc which is too small imo, especially if you ever want to run E85. The destschwerks are the only option that are truly direct fit. The rest require some form of modification to work.

What page is it? Or can you post it again, I went back 4 or so pages and gave up. The response is phenomenal though yeah? 0-100 street driving is fantastic. Boost is always there even if you in a gear too high. You can also have boost with partial throttle which is fantastic for roads with poor traction and accelerating through corners. Its such a hard thing with a smallish 2.5L engine, once you go any bigger then you have now you will loose response. Do you have anyone in your area that can let you take their car for a quick drive? You will be able to gain more top end but you will loose low down, it all depends on your preference. If you drive it balls out all the time then yeah go a bigger turbo and keep it on the boil but if its a street car driven at sub 50% most of the time then I reckon stay as is.

I have had both on my car with exactly the same mods. They are completely opposite turbos. The ATR43G3 was over 1000rpm less responsive then the SS1, was a HUGE difference. I was able to make 280rwkw with the ATR43G3 and 245rwkw with the SS1. The SS1 is way better for the street, standard turbo like response. I now use E85 fuel and make 280rwkw with the awesome response. On both turbos my boost would drop to 15.5psi no matter what I did, boost controller, wastegate studs etc. I found replacing my intercooler and fixing up the exhaust helped as now boost only drops to 17.5psi. So for me it was other restrictions in the setup that were holding back the boost up top. If you wanted to go bigger I would stick with the SS range, either the SS1PU or the SS2. I thought the ATR43G3 was too laggy for a street rb25. The SS2 is around 3-500rpm more responsive then the ATR43G3.

I did not say a 4" exhaust is only capable of 400rwkw, I am saying once you go over 400rwkw you should be looking at a 4" exhaust as you will most likely get gains.

Yeah its a guide for plumbed in internally gated turbos. It doesnt mean you cant make more than 399rwkw with a 3.5" exhaust or 510rwkw with a 4" exhaust, its a rough guide. So if you are aiming for over 400rwkw then you should look at a 4" exhaust if you are plumbing it back. Yes there are people making 350rwkw on a 3" dump pipe but a lot have 3.5" catbacks. The test is not if you can make the power but how much power you would gain from a larger exhaust, not to mention the release of back pressure and heat. Regarding the 600hp na 5L V8, yes N/A exhausts are completely different. The turbo back exhaust looses nothing by being too big. Theoretically you want the largest exhaust you can fit. Obviously after a certain point for each power level the gains are negligible so you dont bother. But you dont loose anything from going too big.

Nah your right, the less boost you are running the less fuel you will use. But my point is, if you are low on petrol you shouldnt be hitting much boost if any. Does that make sense? Driving off boost, least fuel Driving on low boost, mid fuel Driving on high boost most fuel So if I want to conserve fuel for any reason I just keep it off boost. Flooring it around on low boost will still use plenty of fuel haha

Good point, that does change things. I am just bringing up the issue of exhaust size when talking about a large turbo like a GT35. A turbo which is capable of 400rwkw on 98 fuel. The rough guide on this forum is 3" for 300rwkw, 3.5" for 350rwkw and 4" for 400rwkw. Your right external gate venting to atmosphere wont require as large as an exhaust as an internally gated turbo. I think its just worth a thought when getting a custom exhaust made up. Wont cost much extra to be a size larger and might save you getting it all redone later.

Pretty sure the rb30 making 300rwkw would have had a high flow fuel pump! Know what your saying though you can make enough power from a stock bottom end to do lots of naughty stuff on the street.