Nistune Forums

Hmmmmmm. That's a bit weird that the 10psi spring gives unlimited boost. Even if the WG doesn't flow as much as it should up top, you should still see 10psi down low. Was your top port open to atmosphere??? Try carefully feeding compressed air into the WG lower port and see at what pressure the valv...

OK, that tells me your WG flow isn't ideal but it's good enough if you're happy with 17psi up top. Yes a 4psi spring is gonna make it feel pretty lazy for sure. Can you fit a stiffer spring? 12 or 14psi spring would be nice - and then just run spring pressure for now. Nothing worse than trying to tu...

OK, best you do some really basic tests. So first you need to work out if your WG is capable of bypassing enough exhaust gas to control boost. I've only done this on internal WG systems as external systems tend to work better. With IWG you just remove the actuator from the WG flap arm and go for a d...

I usually just add a bit of fuel in the "Enrich Throttle" tables. SR20 enrich at high temp.JPG You may be able to pull timing by adding a few degrees to the whole "After Start Timing Adv" table and then taking the same amount from the entire IGN map. Then remove the same amount i...

Yes that's right - we're just trying to match the numbers of what the ECU reports to what is on the timing marks. Nissan's procedure is just trying to make timing sit at 15 degrees. But if you know what the ECU is commanding then it doesn't matter if it's 15 degrees, or 10 or 3 or whatever. As long ...

Yeah I guess that WG is a bit on the small side. Should still be OK though if the plumbing is good. I assume you're triggering the timing light from a spark plug lead fitted temporarily between no. 1 coil and the spark plug? That's the only reliable way to do it. Assuming your light is triggering re...

Just be sooooooper careful if you're playing with boost and not sure about timing. You'll break it very easily if you mess up. I'd recommend only loading it up long enough to get a feel for what's going on. If your timing is being reported at 3 degrees then set it to 3. It just means your idle speed...

It's only if the plumbing to the WG is poorly designed that you'll get that uncontrolled boost. Normally a 14 lb spring will give approx 14psi boost.

Google "wastegate priority". It's basically about ensuring that the exhaust gas has a nice easy path to the wastegate.

PL

I have seen ext WG's leak a bit - presumably around the shaft. There's no seal, so it probably makes sense. Int WG's are different - and they will usually seal 100%. So I wouldn't be too concerned about that. But if you can supply enough air to make the WG just crack open then that's your effective ...

Yeah you definitely need the boost sensor in the correct location or you can get some terrible problems just as you open the throttle. I learned this the hard way. Yes they self learn but no real need to clear it. Just drive it. It's only a small trim anyway. You won't see timing change in NIStune w...

Does this cause any driveability issues? If not then I wouldn't worry about it.

Could also be something to do with AFR sensor in tailpipe. Never ideal. Best in a dedicated fitting in the down pipe.

PL

Aaaah good to hear! :) It's always good practice to replace them but in reality I usually have a good look at them (pref with eyeglass or some sort of magnifying aid) and if they look OK I re-use them. Never had a problem. Check that they are free of splits and have a nice round cross-section. If th...

Yeah fair enough. Those EV14's look good. You can often tell just from the price. If it's too cheap then beware. Genuine Bosch EV14 or ID injectors always perform well. Things to look for are "hi-flowed" and "matched set". It's been common practice for people to take small inject...

Well you know how the saying goes "If it seems too good to be true then it probably is". They smell of Chinesium to me... We were getting them locally off eBay (Australia). Some guy had a connection to one of the local tuners and was flogging off genuine used sets for $AU200 - $AU300 a set...

Injector choice for NEO engines is easy these days. Just get a set of used R35 GTR injectors from one of the places in your area that tunes R35's. These are 570cc and an exact fit - including connectors. So no mods needed to anything. They are a modern injector so they have 12 holes in the end - giv...