So to reduce lag the only factor I can see is the tune . To get your engine tuned to rev quicker to speed up spool . An EBC decides when to stop turbos from boosting so I dont know how that will do anything for faster spool . Im not EBC expert so obviously something im missing ( I mainly got it coz its fancy ) Where in Sydney is a good place for a tune ?
its because they're "tuned" for this you said it yourself. I'd also assume they'd put in a better fuel regulator.
A EBC does help you spool up faster. Stock waste gates open at 3-4psi, an ebc will keep them shut until you reach your set boost controller pressure and then the solenoid opens. Some EBC's give you control over when the waste gates open slightly and a boost cut off. If you're aiming for 12psi you'd set waste gate pressure to about 7/8psi then over boost protection to 14psi. Some EBC's will also monitor RPM and you can set boost to hold all the way through to redline.
So I have been monitoring this thread but the weekend has been to hectic to reply! But I am getting a general idea of things, so I thank you all for your wisdom. I may just turn my boost down back to 12PSI just to be on the safe side, and chuck it on the dyno in a couple of weeks. Will post graph in here for your viewing pleasure. I also decided to follow the initial advice of Anti. I have installed equal length hoses from the wastegate and the PRP to the boost controller. I /may/ have noticed a slight change in spool time but that is about it (this may just be because I have increased the PSI in the first place). I am still unsure as to how equal length hosing will make a difference, but the money is spent and the work has been done What McLovin was talking about before, the EBC stopping the wastegates from opening early into boost, does an MBC do the same thing?
No. MBC's don't suddenly open the wastegates at the target boost level like a good EBC will do. MBC's open progressively after a certain point. Set that point too high and you get boost spiking. Set it too low and you get more lag, or at least lazier response. A good EBC properly set up will get you up to target boost ASAP and only then will it start to open the wastegates. This is not always good. If your boost is > than your traction, you'll be sideways unexpectedly muchly So you need to set the gain ( wastegate opening curve ) just so, to meet the duty cycle ( boost level ) at the the right point. This shit does my head in at times but I'm mostly onto it Tom, if you're free tomorrow or Monday then come on over. We can plug an ECUtalk module or ConZult equipped PC into your ECU and do a rough check of your injector duty cycle as you crank it up. ( just don't bring whatshisname with you :rofl: ) I'm running an EBC ( Gizzmo MS2 ) plus I have a MBC which can be swapped in pretty quick. You'll get a better idea of your choices if you have a drive of my Zed with both types of controllers. Can also show you the options for routing the boost control lines. Anyone else who wants to come along, feel free
Mick, that would be absolutely awesome! Could I possibly come tomorrow (aka today, Sunday?). Will probably be best that I come alone if we're going to be in my two seater haha. I would very greatly appreciate your help. Also, it'd be nice to catch up and share some tales. What time would suit you? I'll PM you my mobile number as well.
You run out of injectors at 13 PSI. Rule of thumb is not to run the injectors at greater than 85-90% duty cycle which on a stock car is about 13 psi. REGARDLESS OF WHAT INTERCOOLERS OR OTHER MODS YOU HAVE. IGNORE THAT AT YOUR OWN RISK
I had a talk to Turbo Smart I had a talk with Turbo Smart about T piecing the turbo pressure feeds together and then to the boost controller. Hi, Having two different signals tee'd together could potentially have different outcomes. Length of line, flow path of air, and internal parameters of the tee piece can all affect boost control performance. So, it is best to just use one line from one turbocharger. Kind Regards, Richard Shumack ------------------- TURBOSMART Performance Products
Agreed with the above. When tuning my car, my tuner tuned the car to 14 psi and it started to ping slightly, so he knocked it back down to 13.5 without pinging. I made 212.6 rwkw on 13.5 psi and the extra boost to 14psi only made like 215kw, the extra couple of kw would be unnoticeable on the street. Also, my car was only SLIGHTLY pinging at 14, so it's probably unnoticeable. I really doubt you'd be able to feel the difference between 12 and 14 psi on the street with an MBC, so why risk it? Also, to those running more boost with an MBC without a tune, how do you know that your car isn't pinging?
Sarcasm? You realise they make controllers with two solenoids too? One for each turbo, for parallel and sequential setups. In the case if using 1 solenoid/valve they all recommend using 1 turbo as a boost source. Turbo tech the highly praised mbc also recommends blocking off a port. Even the stock setup uses one boost source per wastegate, they're separate left and right solenoids with their own pressure reading. Do whatever you like listen to some if these guys here and run 16-17psi and leave your stock solenoids connected while using a boost controller lol... Forget injector duty cucle, I mean I've logged it but what would I know? So long as you have hectic inter coolers fully sik bro.
With everything that's been said here I really think each car is different. I have spoken to my mechanic, who was working for Nissan when the Zed's were first released, and he thinks two PRP's are the way to go. If one were to spike I wouldn't know, and from my knowledge of the layout of the Z engine (granted, that's very little ) I would need two boost gauges to view both boost levels of each side of the engine? So I wouldn't know if one side was spiking. I'm going to keep the MBC setup I have now until I get an EBC. Pinging itself I think depends on the quality of your fuel, and everything between that and combustion, which is different for each Zed. Only slightly, but it is. This is evident from everyone's different experiences here. I still haven't seen a good reason as to why upgrading SMIC's is a good idea, outside of just upgrading injectors? How does cooler air make a difference?
Increases the density of the air allowing more air to enter the combustion process thereby allowing more fuel thereby allowing more power Ping is not just about fuel, it's about combustion temps, afr's, timing, hot spots in the chamber. There are also two different types of 'ping' commonly referred as the same thing, but they are not. One happens before spark (very destructive), one happens after spark (less destructive initially but over time just as damaging to the engine). The first type results in holes in pistons, the second type results in piston meltdown and seized rings; ie the engine will still run just way down on compression.
Cooler air... Cold air has more oxygen per volume, than warmer air... So yes, larger SMICs do indeed help. But I would only upgrade them if running higher than stock boost levels. For stock boost, I would keep stock intercoolers.
