nuclear_z Posted January 13, 2009 Posted January 13, 2009 Well, whilst it is no major achievement, my goal of having 200rwhp was achieved today without even leaning on the engine! I took my car down to Screaming Performance where we sorted some base timing issues and fixed the location of the MAP sensor... For some silly reason the car has a 3BAR MAP sensor > I cant imagine running 3 BAR > all it does is reduce the amount of fine tuning we were able to do... We then spent ages pulling heaps of fuel out of the maps in the computer... Ended up with a very nice flat 14.7:1 off boost and 13:1 on boost.... The car now drives much nicer, being able to remain in gear right down to 1000rpm before down changing or coming to a stop. I can also pull from 1000rpm in every gear! Made over 550NM of torque at 3700rpm and 150rwkw or 202rwhp at 4000rpm... I will get the print out and post asap. Also had the exhaust noise checked. Without the silencer in its bum it was 101db and with it 93db - under the limit The silencer killed 15rwhp SO I think I am going to get rid of the stupid cannon on the arse and fit a nice muffler.... Quote
Zeddophile Posted January 13, 2009 Posted January 13, 2009 For some silly reason the car has a 3BAR MAP sensor > I cant imagine running 3 BAR > all it does is reduce the amount of fine tuning we were able to do.. 3 bar will work for 30psi of boost, which while large, is forseeable. Realistically 25 psi would be a better max with that MAP sensor, as it leaves some headroom so it doesn't go out of range. The thing to remember about map sensors is that the first bar is atmospheric pressure. So when you turn the ignition on, it will read 1 bar (depending on altitude), and any time you are on fully open throttle in a naturally aspirated car it reads 1 bar. I don't understand why it reduces the fine tuning ability though? What ecu is it running? Either way, congrats on the 200! So much fun to be in a light car with that amount of power coming out the back, isn't it.... I still get a big silly grin every time I nail it. Although you very quickly get used to it, and think "just a little more." Quote
nuclear_z Posted January 13, 2009 Author Posted January 13, 2009 3 bar will work for 30psi of boost, which while large, is forseeable. Realistically 25 psi would be a better max with that MAP sensor, as it leaves some headroom so it doesn't go out of range. The thing to remember about map sensors is that the first bar is atmospheric pressure. So when you turn the ignition on, it will read 1 bar (depending on altitude), and any time you are on fully open throttle in a naturally aspirated car it reads 1 bar. I don't understand why it reduces the fine tuning ability though? What ecu is it running? Either way, congrats on the 200! So much fun to be in a light car with that amount of power coming out the back, isn't it.... I still get a big silly grin every time I nail it. Although you very quickly get used to it, and think "just a little more." Few thoughts. I am running a Haltech F9s 1. The reason a 3BAR MAP sensor reduces clarity of tuning is that given that each range tuning map has 16 levels of input, each level's width is greater because its has a larger amount of pressure to divide. I hope my explanation makes sense. 2. With the current engine, I cannot in any way imagine 20psi let alone 30psi... I think with a host of improvements to the piping, the air intake and other small jobs I will make more power... I need to find myself a factory airbox off something that will fit down the cold side of the engine.... I was seeing intake temps of 65oC due to the poor positioning of the pod filter... Quote
dazzed Posted January 13, 2009 Posted January 13, 2009 13.1 on boost thats very lean isnt it ,wont the engine ping and detonate it self at that a/f ratio are you sure these figures are right, it just dosnt seem right to me Quote
sco_aus Posted January 14, 2009 Posted January 14, 2009 550nm is very impressive, good work mate. Quote
stevo_gj Posted January 14, 2009 Posted January 14, 2009 Also had the exhaust noise checked. Without the silencer in its bum it was 101db and with it 93db - under the limit The silencer killed 15rwhp SO I think I am going to get rid of the stupid cannon on the arse and fit a nice muffler.... Silencer? Like a little valve that you can switch on/off to kill the exhaust noise? I've heard something about adjustable exhaust valves in Skylines, is this the same thing? Is your goal is to have reasonable exhaust noise so that you can still get full power when your driving in quiet streets? Quote
Zeddophile Posted January 14, 2009 Posted January 14, 2009 1. The reason a 3BAR MAP sensor reduces clarity of tuning is that given that each range tuning map has 16 levels of input, each level's width is greater because its has a larger amount of pressure to divide. I hope my explanation makes sense. Ah, okay - I just checked out the software for your ecu, and now I understand the issue.... With my ecu you can change the MAP values that the fuel map is referenced against - so imagine you can set those MAP values along the bottom of your load site to whatever you wanted, say set the low end to 20 kpa, and the high end to 150kpa, and then space the values in between however you wish, including uneven increments. However thats not possible with your ecu Which software do you run with the F9s? If its the same as an F9, the version I downloaded allows you to change the amount of load sites up to a max of 32 for each rpm range, which gives you one roughly every 9kpa instead of every 18kpa (you said you had 16 load sites?).... Could be worth a look? I couldn't find any mention of an F9s on the haltech site, so I'm not sure which software it actually uses. Quote
nuclear_z Posted January 14, 2009 Author Posted January 14, 2009 13.1 on boost thats very lean isnt it ,wont the engine ping and detonate it self at that a/f ratio are you sure these figures are right, it just dosnt seem right to me I'll post the afr's as soon as I get off my backside and get the print out. 13:1 on boost is quite aggressive tuning I agree. Its mostly a transitional thing. It goes to 12:1 when it reaches max boost of 8psi or so... Silencer? Like a little valve that you can switch on/off to kill the exhaust noise? I've heard something about adjustable exhaust valves in Skylines, is this the same thing? Is your goal is to have reasonable exhaust noise so that you can still get full power when your driving in quiet streets? Not planning on putting a valve in, like the Varex system... I call it the butt-plug.... its basically a big restrictor.... has to be bolted in the cannon and restricts the amount of flow coming out, therefore noise I am planning on putting either a proper 3inch muffler or a 2 1/2 inch one... THe gas velocity should be good then as it will have cooled off a bit by the time it gets there. Ah, okay - I just checked out the software for your ecu, and now I understand the issue.... With my ecu you can change the MAP values that the fuel map is referenced against - so imagine you can set those MAP values along the bottom of your load site to whatever you wanted, say set the low end to 20 kpa, and the high end to 150kpa, and then space the values in between however you wish, including uneven increments. However thats not possible with your ecu Which software do you run with the F9s? If its the same as an F9, the version I downloaded allows you to change the amount of load sites up to a max of 32 for each rpm range, which gives you one roughly every 9kpa instead of every 18kpa (you said you had 16 load sites?).... Could be worth a look? I couldn't find any mention of an F9s on the haltech site, so I'm not sure which software it actually uses. I'm running E6s software... Its, well OK. It does the job well enough, cold start is fine.... its just an older system with less features than say my Greddy Emanage Ultimate I have in my Skyline. Currently I dont think I am going to play with it all that much. I want to get the damn thing engineered first... Quote
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