whatsisname

If us lowly non-Motec users are cheap skates what does that make a carbie user! A shoe lace out of one of the cheap "skates"? 'Just havin' a laugh Brad'

H/C....hmmm nice! May as well while the motor's apart Rob, Friday sounds good. I'll see how I go? Out of interest is anyone else going to see JAMIROQUAI on Sat' night? Should be a good night :headbang: :headspin: :Party: :singer:

Same here Allan. I've got Kings 'low' & the front sits slightly higher than the rear. I see this as a good thing! More clearance for the front bar. Even a 1" drop (rear) is enough to require a camber kit if you want decent wear rates & grip off the line/straight line acceleration.

GFX, So the Jaffamobile suffered the dreaded LS1 high oil consumption!? Good to see GMH doing the right thing. It'd be a good time to do a H/C package

This is for those of us that attended the LS1/Skyline dyno day, & saw/heard Martin's Soarer make 281rwkw on stock turbos. I can confirm that they are/were indeed stock unmodified CT12A's (well the one I played with was). More amazing is that the turbo I had a look @ was in pretty damn good condition, considering it would've had a hard life! I still can't believe how well they held up to 3.0bar of boost on the dyno day (ok so I made that bit up )

Exactly! I'm glad someone pointed this out.

I must've missed your URL? No mate I don't have a webpage. I'll get around to setting one up one day. There's actually quite a few well set up GTS25t's, it's just that most of them you never read/see about. mightymax, Sorry to hear of your Microtech woes. Lucky for me I haven't experienced any of your dramas in the months I've been up & running with the LT12. Sly (Allan), G'day mate. Yeah sure I'd be happy to go for a drive provided it's dry!

:lol: :lol: :lol:

I'm in West Melbourne, I'm talkin' faaaaar west, so far in fact that I'm in Adelaide Sorry mate I'm in a silly mood You're welcome to visit me over here though mate.

You "could" go to Melbourne but it'd be better if you came to Adelaide I'm in SA dude! The clubs in Melb' do go off though! Dunno' much about the clubs here? They always seem to have people lining up down the streets to get in! A national meet would be bloody awesome :uh-huh: "If we organise it they will come" You know Tim from RPM was just saying the other day how good it would be to do a "tuners contest" in HPI or Zoom. Each workshop @ the same place/dyno/conditions. They all have the same car for X time, have to set it up with there choice of ECU, tune it, & THEN return it to standard within the time limit! The logistics of it would be tricky but interesting concept none the less! I'd have loved to do a back-to-back comparison. Something for Martin to look into perhaps? It's good to see us SAU guys can have a decent discussion without it turning into a shit fight mate If you're ever in town (Adelaide) look me up. Matt

Sounds like stock ECU commanded timing retard. Except it would be it in all gears not just 4th & 5th. Coil pack? I wouldn't have thought so? As it comes good from 6k onwards. Does it flatspot in the same rev range every time? i.e. it's always ~5k it dies & ~6k it comes on strong again. What mods have been carried out on the engine?

John, I won't spoil it for you (& everyone else) but I thought it was you I saw the other day! You we're lookin' very cool mate Nice colour too :uh-huh: Matt

Sim, G'day mate! Ya' can never have too much A ride in the pram spins out the new addition so she must be blown away by a ride in Skyline! :lol: I'll drop you a line no prob's mate. As you'd know I don't go on ICQ @ all these days, it stuffed up & I've been too lazy to suss it out HKS GT3040 @ 2.0bar "Holy smokes Batman":eek: Azlan, No mate the BOV replacement wasn't to improve performance. Hmmm, actually it was & it wasn't. My stock BOV never leaked (@ 13-14psi it shouldn't either!) but it did have trouble discharging the pressure on closed throttle. In short it wasn't able to dump all the air & therefore caused compressor surge. So on went the GFB "Basic", which actually flows 93.6 CFM compared to the Mach 1/Plumb Back - 54.5, Hybrid/Bovus Maximus - 80.1 & the Mach 2 - 53.3. The Basic is the quietest of this bunch too, less restriction ='s less psshhhhhht (something I prefer). It's also the cheapest! My guess is noise levels sell BOV's The fact that it's a vent to atmo BOV is only due to it's superior flow capabilities, & having a MAP based ECU. Defectable for sure but then so are lots of things! Unless the factory BOV isn't doing its job then I can't see any performance gain in replacing it. It was working fine in my case, it just couldn't dump enough air. Matt

Merli, You're more than welcome to hop on a plane, fly down (stay @ my house if you like, as long as you don't mind a 7wk old baby crying 1/2 the night ) & drive my car to see how poorly the lowly 256 load points feel in terms of all round driveability. I'm dead serious too! :uh-huh: As I said in my "257rwkw" thread, driveability is excellent. I wouldn’t say it if it wasn’t! It "was" a little off factory quality but after some further tuning by Mr HPI himself I'm a very happy camper. Tim from RPM did most of the work (on Freebaggin's tune) he then loaded the maps into mine & went from there. Martin finished it off nicely (FOC too!) As for my analogy, let me try again.... Lets take the most expensive high end home audio (I'm talking' mega quality gear!) It probably has THD, wow & flutter, signal to noise ratio (or whatever the hell they call all that jazz) that's so good it's beyond the ability of the human ear to pick the difference from low spec equipment, sure the top notch gear is great but only your dog will appreciate it I realise 400 is better than 256 (bigger being better & all that) the question is…..how much better!? Other than a possible slight difference in economy (something I personally don't really care about) would you be able to feel a difference on the road? Or see a difference in dyno numbers? A very skilfully & carefully tuned ECU "should" have A/FR's that make for best power & economy irrespective of closed loop. Providing there is temp correction I see no reason this won't be the case. That's not to say that CL doesn't make a difference, just it's not as much as people think. Incidentally Microtech will upgrade to include CL soon. Andrew, That Zoom article (penned by Martin some time ago) also shows the Microtech range doesn’t have laptop control. It certainly does now. It also 100% does have temperature correction (water/air). These functions allow the ECU to make fine adjustments in relation to air & water temp changes. Thus maintaining a perfect A/FR & idle stability. The air temp function also allows the ECU to control the timing (advancing or retarding) dependent on inlet temp, once again to ensure perfect A/FR’s & maximum safe power. ECU choice is open to soooo many variables arguing one or the other is pointless. Budget Ease of installation Ease of tuning Knowledge of local tuners (unless you’re prepared to travel or have someone come to you) Your set up Required or desirable features (MAP or AFM, logging, auxiliary outputs i.e. thermo fan control / Nitrous control etc.) Even contacts in the business! Ability to revert to standard with ease (such as the PFC) The list can go on! By the way Merli, nice set up & rwkw figure!

I wonder how many people would actually be able to "tell" those extra load points, & a difference in driveability, with a well tuned LT12 vs. PFC equipped car? Ever had a flashy video/stereo that if you we're lucky you used 1/2 of the features? Megs/Sly, The LT12 certainly does have temp correction (air & water). Air temp correction uses a temperature based map that allows more/less fuel depending on inlet air temp. Without it, it just uses the fuel map uncorrected. At the end of the day they both (PFC - LT12) have their respective pros & cons, as do all after market ECU's. We base our individual choices on a number of factors, like price, tuning knowledge, useable features (data logging is damn handy!) intended application, ease of installation & so on. I'm just happy we in OZ have so many quality ECU choices And as I always say - The best ECU in the world is only as good as the person punching in the numbers. I can see this thread degenerating into another ECU war :lol:

Do you mean me or Matt? (Lowth) If you mean Matt, he already has 550's fitted. If you mean me, well, yeah DC to spare is always a good thing.

Thanks Henry

The stock Nissan head gasket has been used in RB25DET's making in excess of 300rwkw. Martin (Donnon) mentioned a motor making 330rwkw on a stock gasket! Detonation will kill them quickly though. The JMS R33 GTS25t still runs standard internals (HKS 1.2mm head gasket & ported head) & has made 308rwkw (1.5bar) And if there's a car likely to be driven HARD it's one driven by Danny! (HPI Aussie drifting videos)

From memory it was ~$1900 plain bearing (well over 2k BB!) Yeah mate it's a straight bolt-on, but it's a very tight fit! They actually had to grind a small area to ensure clearance on the manifold. My turbo is the only area I wish I'd gathered more info on At the time I just asked for a turbo that could make good power without huge boost levels. I was prepared to accept a little extra lag to keep the cost down. When Vince showed me the size difference btw my old turbo & the new one (total size & wheel/housing size) the new one was quite a bit larger. Certainly larger than a high flowed standard turbo. No chance of the original heat shield fitting back on

Jeff, We had a good old chat @ this years Adelaide Autosalon :wavey: Once you've got your tuning sorted you'll be laughing. You've got all the hardware, its just power there for the taking! It's also one very nice looking car mate! I'm all for quick (drag) times, records made to be broken & so on, but I like the idea of knowing what a car can do as is, all day, every day. AIR is set to start street meets this coming weekend (Nov 2-3) but the Extreme Horsepower show is on so I'll wait till a later meet. Matt, See how you go with the 550's mate, if they can flow the horsepower safely your laughing It’s nice to have the extra capacity in reserve though I guess.

Kabab, Yeah it's been a while since that dyno day hey! Thanks mate Yeah like I posted above, AFAIK they're still stock!? It's "possible" to flow @ least 400hp with them on stock fuel pressure. So with a fair whack of additional pressure it "should" be possible. I remember using some basic injector sizing calc's that showed the stock 370cc'ers "can" flow enough for ~420hp @ 100% DC, then add the extra pressure on top. Ahh here it is - A post I made on SDU a while back (contains a quote from Martin) - "Injector sizing is quite a simple rule of thumb. Divide the injector size (in CC) by 5.2 then multiply it by the # of cylinders. This gives you a 90% duty cycle figure for 40psi of fuel pressure." So given the stock GTS25t injectors are 370CC / 5.2 X 6 = 426.9HP @ the crank on 40psi fuel press'. Add an adjustable fuel pressure reg & Bosch 600HP pump, bump up the fuel pressure to 50-55+psi, & you've got potential for 400+HP & duty cycle to spare. Now bump the pressure to 60-65+psi & so on & so on.... The big factor in most cases is the fuel pump isn't able to maintain pressure under the extra load. The Gibson Motorsport GRP A GT-R's ran up to 138psi fuel pressure through Nismo 550's!!! . They used a very impressive supply system to cope (twin systems + a mechanical pump).

Yep that's the one mate Vince is a good bloke, you could do a lot worse. I don't think they've updated their site in a while.

Thanks mate Hmmm? The work email isn't playing the game, might have to send it from home? I'll get it done either way.

Vince Rigoli He did my pump upgrade. He did a very good job & didn't charge like a wounded bull, something that seems rare in Sydney!

Could somebody pls post up my dyno graph for me, thanks Give me an email address & I'll send it on over. J, Thanks mate. Lach', Yeah time to save for those 540's, & then see how it goes @ AIR? See you on the weekend mate. Matt, Yeah I wasn't 100% on the current fuel press' (as Martin & I didn't touch it during the tuning) but after contacting Tim he confirm it @ ~60-65psi. At one stage it was over 70psi, without needing to be that high it ran very rich. The guys @ RPM have pushed 90+psi through standard Japanese import (or local) injectors & they can still handle it! Other local after market injectors have been know to struggle from 80psi onwards. Key factors are - Healthy injectors, & a pump that can cope with the demand placed upon it by running higher than max standard pressure (~50-55psi). That's where pump selection plays a big part. Lee, Your car (once fully tuned) is in another league to mine! 282rwkw untuned, big Apexi turbo, N1 parts, GT-R internals & a 9k rev range - that's 300+rwkw material! Exhaust flow was as unimpeded as possible. nismokid, The LT12 ECU uses its own internal MAP sensor rather than an AFM as per the factory. There are pros & cons with this; a pro is the removal of the AFM in the inlet tract. You can leave it in place if you'd like but it's no longer needed & can cause a restriction. With the AFM gone you can set up a nice custom inlet pipe. You can plug the ECU in no problems but it will need some minor work to install the air temp sensor (nothing difficult or time consuming) The LT12 comes with basic maps (fuel/ign) to get the car going but will need some dyno time to get it running @ it's best. Microtech don't have a web site (to my knowledge?) but if you go to www.horsepowerinabox.com & email the tech (Tim) he will give you all the info you need. Wolf have a GTS25t plug-in ECU soon to hit the market I think? I'm not 100% sure?