Jump to content
SAU Community

Recommended Posts

All good man just having a friendly dig.. :thumbsup: Back on topic...

Fair enough... was a bit cheeky though! ;) I am a bit of a nerd especially when I don't know something, come hell or high water I want to know exactly what and how happens.

To rob82 my comments were more to suggest that an internal wastegate creates more back pressure on the exhaust side. I also think you answered your own question as well... why would you have a large frame single turbo on a small capacity engine with small cams? Engine would choke before the turbocharger even came into its own.

  • Replies 81
  • Created
  • Last Reply

Top Posters In This Topic

Fair enough... was a bit cheeky though! ;) I am a bit of a nerd especially when I don't know something, come hell or high water I want to know exactly what and how happens.

To rob82 my comments were more to suggest that an internal wastegate creates more back pressure on the exhaust side. I also think you answered your own question as well... why would you have a large frame single turbo on a small capacity engine with small cams? Engine would choke before the turbocharger even came into its own.

I honestly think that most internal wastegated turbo would cause less flow disruption/diversion at the point of gating than most externally gated setups. Hence the exhuast backpressure would be less for the same size turbo with an internal gate vs external gate.

Also I was just trying to point out before that if response is the goal massive cams are not the go.

No better example of this than ole mate Marko really.

About time you did, everyone will benefit.

I mean you supposedly asked for a tune without a midrange...

And are firmly on the big cam bandwagon this month:

Yet only 2 months ago you come out with this?

Says it all really. :rolleyes:

i am not prepared to go into detail of my old engine setup as it is not my business to share this intell, however, i will tell you that the engine is running 100kw less - case closed.

my cam choice has ALWAYS been chosen by my tuner - not what i read on the internet from a computer warrior. for example, would someone who has built many rb's (i.e. CRD, RIPS, Red R Racing, Hi Octane) carry more weight than a someone like yourself or me for that matter? stop kidding yourself...how many engines have you built ash & how many combinations have u personally tried?

i have had this thread reviewed (not disclosing name) i am sure you will keep following me around as its blatantly obvious, please stop trolling and posting off topic as this is not the 1st time.

thank you & sorry guys

I honestly think that most internal wastegated turbo would cause less flow disruption/diversion at the point of gating than most externally gated setups. Hence the exhuast backpressure would be less for the same size turbo with an internal gate vs external gate.

Also I was just trying to point out before that if response is the goal massive cams are not the go.

Sorry mate you are wrong there on your first paragraph.

Yes, you want response choose small turbos like HKS GT-SS or N1 upgrade (which means high exhaust manifold back pressure) and chosing short duration camshafts with little or no overlap.

Sorry mate you are wrong there on your first paragraph.

Yes, you want response choose small turbos like HKS GT-SS or N1 upgrade (which means high exhaust manifold back pressure) and chosing short duration camshafts with little or no overlap.

Can you explain why I am wrong.

I dont think you understand what I am saying - try reading my post again.

Under the assumption that the external wastegate is vented to atmosphere your theory is incorrect.

Arguing with you is like masturbating with a cheese grater - slighty amusing but mostly painful!

WTF are you talking about.

  • 2 weeks later...

Real world data. Rb26 at 86.5 bore, stock stroke, all steel internals (endurance spec build, probably overkill, but I hate failures), Tomei 280 degree 10.8 mm lift cams, Tomei cooling channel pistons at stock CR, Motec M800 ecu, stock TB's, stock CR, mildly ported head, all manifolds port aligned, stock ported cast manifolds, NO AFM's, MAP / Throttle based but with 4D mapping, stock elbows, -10 turbos, 3 inch ultra quiet exhaust (98Db at 2/3 max rpm static), 850 CC injectors off single 044 pump, in a GTS-T RWD shell. 1.2 bar boot. Motec shows absolute, not gauge pressure. mikey whatsisname speaks a lot of sense, IMHO.

http://www.gatesgarth.com/datalog.png

In car with basic data overlay from same track day:

Manually synched to video, so a tad out, sorry.

I want to try the bigger -10 turbine housings. Car is a pussy cat on the road, no shuffle at all, totally pleasant off boost and at cruise. Would benefit from a less restrictive exhaust system, exhaust manifold pressure V boost pressure ratio is not brilliant, but here in the UK noise is a major issue. Car runs from the roadside pump Shell V power, no det, no issues.

Edited by Chris Wilson

I think your throttle % mapping is a bit out, highest it gets too is 65% or so whilst the 'bar' is maxed?

5500rpm in second @ full noise before 1.2bar. Maybe you need 290 cams as well to bring them on @ 4500rpm like some around here have claimed :rolleyes:

Pity the data cuts out half way through the video man, it was just looking to get interesting :(

Yes, I am just trying this manual data overlay app (Race Render, it's me, not the app as such, it's trickier than I imagined...), I am beginning to wonder just how far from synched this is, take it with a pinch of salt, but you get the basic idea. Just shut one eye ;) Automagical synching is available from Motec, but the bank manager is dubious about its merits this month ;)

I am in the UK, but try and keep an eye on all the Skyline sites. Cheers. I may have another go at doing a better synch. I have sold my Go Pro Hero camera and for next season will either get the Motec stuff if they come good on their intent to offer a higher resolution camera setup, or buy a camera that time stamps the video. The GPS data channels have a GPS time function, so tying up the two should be far easier then. Cheers.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now



  • Similar Content

  • Latest Posts

    • I have been being VERY quiet about what you're alluding to, as it is something that ticks me off... The number of cars from factory that run coil overs is HUGE! Most of them these days do... The other part that annoys me, is people saying "Well all the incabin adjustable suspension is illegal by blah blah blah"... If that's the case, then why can I buy a car brand new that can do it if, FULL STOP in cabin adjustable suspension is illegal...   Also, I could just chuck some aftermarket shocks in my car, throw the stock springs on, after my blue slip, dump my super low springs back in. Same shock and spring style setup... Hell, they could also be the same colour springs etc.     I'm voting, BlueSlipper didn't want to touch the above car for some reason. Whether it be some sort of bias against the car, the owner, them maybe having previously done dodgy shit and now they're being super careful in case they get slapped in the face by the Gumbyment again... Find a new blueslip place.   And can confirm as you had said, yes there are holy bibles of vehicle heights, and all sorts of other suspension stuff. Heck your run of the mill mechanic, and tyre shop has access to all of that stuff. It's how they do wheel alignments...
    • Funny story Heading to Sydney this morning on the HWY there was some slow traffic, so I gave it the beans and midway through my overtaking "power run" I lost all power It seems that I missed a hose clamp,  and the MAF and filter went WiFi To make this more problematic, the little tool kit that lives in the boot, is sitting in the sun room at Goulburn......LOL Luckily for me I found a bit of steel on the side of the road that could be used like a rusty and bent flat head screw driver to tighten it up enough that it got me into Sydney, it is now all tight like a tiger with the aid of a 8mm socket Note to self: Use my brain and double check stuff, and always keep that little tool kit in the car for when I have a brain fart
    • Oh, and as for everyone with their fuel economy changes, I switch between E10 and 98 in the company car. Even do when I had personal cars that could run on E10. You know what changed my fuel economy in any noticeable way? How I drove, and where I drove. Otherwise, say on full tanks of just back and forth from work only (So same trips, same sort of traffic), couldn't notice a difference that I can correlate to the type of fuel in use. In the current vehicle, that's over 42L of USABLE fuel. While 98 is all "more energy dense", it also has higher knock resistance as it takes more energy to get it to ignite too. The longer hydrocarbons, typically more tightly bound. So running the same ignition map, can also produce less power, if there isn't enough time to get it all burnt through properly, as yep, the flame propagation speed is different from lower octane fuel to higher (Higher has a lower flame propagation, due to the more tightly bound and harder to self ignite funs. This is also typically where, a vehicle that is designed purely to run on 91 (Whether it be E10 or normal 91) usually sees absolutely no real world difference in fuel economy for the normal man, woman, or dog.
    • We've got some servos around me that have 91 with E10, 91 (no E10), 95, and 98. At those stations the change from 91 E10 to 91, is typically around 8c/L.   But lets not get started on the price of fuel in Oz. It's ridiculous. All the service stations around me, bar one, the price of fuel has been over the $2 mark per litre for the cheapest, 98 being around $2.45. That one service station is a CostCo, fuel from it comes from the same refineries, and makes no pitstops, it runs great, including the 98. In fact, I've had no issues on CostCo fuel, but plenty of issues at other stations!. The CostCo fuel, was $1.65 roughly this week for 94 with E10. $1.88 for 98. Servos directly across from it, $2.10 for 91 E10, and $2.48 for 98. The part I had to laugh at? If I drive multiple HOURS away from Brisbane, say out near Nanango, or Kingaroy, or even out to Goondiwindi, the price of their fuel, is the same as what it is at the CostCo... Oh, and that BP servo at Goondiwindi is HUGE and goes through epic turnover of fuel, so it's not sitting there for weeks going to shit. And what blows me away, my mate is one of the people who drives the Fuel Tanker all around QLD, delivering to all those places. At the same company his previous role was doing the "local haul" deliveries... Same truck, same driver, same pickup point it all comes from. So you tell me, how the hell it is 60c/L CHEAPER for fuel, when nearly all else is equal, except they require a B-Double to drive half a day out of Brisbane, and half a day back, every second day, compared to the delivery that can be under 30 minutes drive from the fuel pickup point... Not to mention, go five blocks down the road, and Ampol to Ampol will vary 30c/L... And I've had this conversation with my mate... The way it's priced, is just typical, pure and utter rubbish... He also does runs from Brisbane, to all over QLD, down to Newcastle, Sydney, Nowra, Melbourne, Geelong, and even out to parts of the NT depending on the companies needs. His main stuff is all the longer distance away from home for a few days at a time, then when he's back, he loves to just pickup extra shifts wherever he can in whichever truck, hence all the weird different places.   Oh, as for getting E10 into all the fuels in Australia... It was very quickly highlighted, that we don't have enough biomass available to use to make E10 sustainably like they require, and it would dramatically cut into our, and the worlds food chain supply...   I vote we all just start running on liquid methane gas... Plenty of that just getting tapped off at tips from underground decay... (Note, this is pure just stupid commenting. I could very easily highlight the reasons its not a good idea especially on scale...)
    • Am I correct in assuming that the R35's are getting the classic skyline haircut off the odometer?  Quick search on carsales, there are 33 08 and 09 GTR's for sale, only 2 of them have more then 100,000km's on them (116,075 and 110,000 respectively).  And somehow there are about 25 for sale with around 60,000kms? Looks like the classic skyline haircut to me =/
×
×
  • Create New...