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Having recently done a RB box conversion I am looking at doing a flex tune upgrade on my car in the not too distant future. Currently running a nistune with a set of nismo 740cc injectors and a walbro 460 Turbo setup is a precision HP5130 and I am running un1cams +springs Car is currently making 310hp @ the wheels on a "safe" 98 tune I know everyone is going to tell me to throw out the 740s and go top feed etc, however I was wondering if anyone on here has seen how far the Nismo 740s can be pushed on E85 with a bit of help from a fuel pressure regulator ? Not wanting to go top feed I guess the other option is to go some five O 1200cc side feeds which seem to work ok for the SR20 but are rubbish when it comes to RB engines. I'm thinking that Dose pipe might be the man with the most nistune flex experience who is active on the forums so any input would be appreciated
Dose Pipe Sutututu posted a topic in Nissan Silvia (nissansilvia.com)Every once in a while I get a PM regarding E85 setup, tuneability, etc. Best I bang my ramblings into a post Just to give you an idea, I'm just an enthusiast with some tuning knowledge & experience. I mainly just tune my own car and my mates for shits & giggles. To date, have not blown a motor Here goes! Q: Power should never dictate E85, there are so many benefits of E85..I often here people say you're not making 200kW+ why would you want to run E85 for? Let's start off with a few things. Being a 4 banger Nissan motor, they have relatively a longer stroke vs. their bore size.. nothing wrong with that, however this creates loads of torque and hits max VE quite early but also noses over, i.e. torque decays vs. RPM much quicker. Now this means the timing map would have a dip where max torque/where max VE is achieved.. Let's make up some timing values vs. RPM: 3600rpm - 15 4000rpm - 13 4400rpm - 12 4800rpm - 12 5200rpm - 14 5600rpm - 15 6000rpm - 17 See how the timing value drops where max torque is made? now with E85 you have these benefits: slower flame front, i.e.takes longer to ignite - awesome, means you can dial in more timing burns cooler - awesome, means you can dial in more timing and EGT and cylinder temps are low knock resistance, awesome just dial in timing till it makes no more power So let's revisit that timing map again, with E85 you could potentially do this (once again making up timing figures): 3600rpm - 17 4000rpm - 17 4400rpm - 17 4800rpm - 17 5200rpm - 17 5600rpm - 19 6000rpm - 21 So now regardless of power achieved, etc. you've just altered the motor's torque curve.. this also equates to more power before max power is achieved. Your torque curve will drastically look different and not to mention you'll be baking tyres quite easily. Q: I want to convert to E85, but is it really worth it? There's no real cost to going E85, just need to address old crumbly fuel hoses, a decent enough flowing fuel pump & injectors that will flow more fuel. Say if your injector setup is flowing at near max - with E85 you would need around 30~40% more "injector". i.e. 550cc on 98RON you're going to need 715cc+ for E85 thus a good choice would be 740cc Nismos OR just fuark it and convert to top feed 1000cc injectors. However say on your current setup you're only hitting 50% duty cycle on your 550cc injectors then going E85 means you'll just operate them at 80%+ duty cycle.. i.e. happy days! Being old Nissans, I recommend you change your fuel lines to new ones (not necessarily ethanol compatible ones but might as well) just for piece of mind. Also when you first convert I recommend changing your fuel filter every 2/3 tanks for the first few months (if you have a dirty fuel tank). Other than that, convert now and bake tyres!
Hey Can get a set of second hand Type Flex. (the twin tube ones) for $950. Finding it hard to find any reviews about them..especially these ones. Spring rates seem odd..they're 7/7 Background info, after new shocks. Car's to be used on "weekends only" / drift. So not really a daily driver etc.. Other suspension mods are strut braces and also sway bars soon. (whiteline f+r). Was going to get something 8 / 6. Pref in a mono tube.. [EDIT] Blitz ZZ-R, Can't find ANYTHING about them..other then they may be re branded BC's? Tossing up between zz-r and bc br's.. Might just get BC BR's (type RH if it matters) if all else fails.. Anyones 2 cents? Any help would be appreciated