Skepticism

3 2860s 1 for each cylinder pair

Hybrid isn't a bad thing if it's done right. Regenerative braking, an electric motor spooling a huge turbo from whatever RPM you want, like some electronic anti-lag, plus extra energy recovery on wastegated gases... that would be next level shit.

Article says as much. Though unclear whether BW itself created it or some other supplier. more info + dyno here http://www.motoiq.com/MagazineArticles/ID/3849/PageID/9105/GTA-Road-Atlanta-teamcanada.aspx

as long as you're on the gas and the rear wheels are slipping otherwise it's understeer city there's a huge learning curve with them

The spec racer ford has a tonne of lift off oversteer. You correct it by getting very slightly on the throttle when you suspect the rear's going to get loose. Basically to get the most out of it, the way to go is either left foot braking + a smidge of accelerator, or just wuss out and brake in a straight line, heh

I raced quite a bit, but got sidetracked by Assetto Corsa which has a few drift cars and tracks. I'm relatively decent in the Star Mazda - usually like 2 seconds off the aliens, however that's good enough to win the occasional race when better drivers aren't around XD I'm slow as shit in the V8s though. Just can't get my head around those vehicles. Understeering shitbuckets.

Update ... no longer after the calipers cause I found another set locally. GLWS

Lol, that sounds fun Agree with softer rear sway. Also if you're not running some toe in at the rear that could be an issue, toe-in will help keep things planted. Changing to mech diff would be the go as well. Particularly if your own VLSD is buggered and doesn't lock any more , a 1.5 way will lock more on decel and reduce oversteer Beyond that I'm pretty sure damping is the next port of call. At least if textbooks and iRacing's physics are accurate, haha :S... Basically if corner exit oversteer isn't a bigger issue, add more front damping. More stable on entry, the cost is less stable on exit. If you're oversteering in both entry and exit then gotta do something else. http://www.ozebiz.com.au/racetech/theory/shocktune1.html

I've tried most ramen in Sydney and I'm pretty sure I've narrowed the best of the best down to two: Manpuku Ramen in Kingsford. Main attraction is that they just do it right - which is probably why it's always filled with Japanese people. Handmade noodles, thick flavourful broth and their recipes are different to the usual generic bullshit that seems to be endemic in Asian food in Australia. Gumshara in Chinatown. It's in a food court off Sussex St (entrance is west off the northenmost arch thingy). Place is hardcore - they let the broth boil in huge steel pots all day until it's basically solid. It's so f**king rich you will be comatose afterwards. I recommend starving yourself all day, then doing leg day at the gym, then ordering the one that comes with a massive spare rib balanced over the bowl.

Dibs on calipers if they're still for sale! PM'd

Thanks for the answer disco Bear in mind that I've got an SR20 - I just thought SAU would be the more interesting place to post this as I've seen a lot of in depth discussion on turbos Upsizing the turbine wheel seems interesting for SRs though, as going for the large T28 housings is a generally a waste of time. Maybe because unlike RBs, SRs make most of their torque in the mid range and fall off quickly, so need a bunch of timing up top to make power - so maybe the SR head limits things and breathing isn't such a huge priority. With bigger housings there's still a power increase, but with substantially worse lag and boost threshhold. Conventional wisdom is that a bigger comp wheel on the same housing will yield similar power with better transient results. Nobody has ever really tested a really small A/R with a bigger wheel before though. I have no idea what would happen. I guess that's my main question.

This has been nagging at me a bit. Apparently Garrett's created a T3, twinscroll 0.61 A/R housing that would presumably go on something like a GTX3067. It seems faaairly undersized (understatement) and makes me wonder what Garrett had in mind. What would its characteristics be like in comparison to a T28 turbine with the .64 a/r housing? Twin scroll aside. I'm not sure how to calculate which housing is actually bigger given the difference of T2/T3 and single/twin scroll, but my guesstimate is that the .61 is actually smaller.

Speed lines should be the same - boost is a function of compressor speed and airflow. so whether the power source driving the comp wheel is a turbine, or the crankshaft directly as in a supercharger, etc shouldn't change anything. it's defined by the aerodynamics of the comp wheel and I guess comp housing The one thing that will change is engine VE.. the smaller housing should take a bit less timing due to being restrictive, so (unless I'm wrong, which wouldn't surprise me) I reckon this would have to be guesstimated when converting the HP to obtain the airflow in lbs/min with the smaller ex housing, a given HP would need slightly more airflow as the VE is lower due to less timing. And the converse for the larger housing. Maybe your calculations already took that into account tho, I dunno! It's pretty easy to work stuff out with tools like Matchbot around otherwise I'd have no idea.

I've seen a couple of tests where the 6258 doesn't really outspool the 6758 despite the smaller wheel and falling off much sooner. IIRC one comparison was on the ART silvia and the other was a Perrin test. Given how fast the 6758 spools it doesnt matter too much, but still, anyone know what the deal is?

As in, do a dyno run with both of them. Will be interesting if the ebay cooler is actually better

please do a back to back

I get the feeling this was a typo.... ? Judging by the general tone of the post + the typo frequency in cobra's posts

dyno readouts of cars with exhaust restrictions are the saddest shit ever. takes forever to spool and no power. even if you can still hit your power goals you'd want to get the thing spooling as early as possible right?

Off topic, but please do a SR20VE build instead. I'd love to see a gazelle with one of those in it.

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Would have thought tuner would have suggested just dropping the exhaust then seeing what happens on the dyno, otherwise too many variables to f**k around with.. dump, cat, mufflers, step downs, whatever. Intercooler could be plausible but I dunno the Blitz SE I wonder whether tuner is right about the housing though.. bear with me on this. Maybe someone more knowledgeable than me can let me know what they think Turbines extract energy out of the exhaust flow by the wheel via a pressure differential before and after the wheel. If there's an exhaust restriction after wheel then the pressure is higher so the difference before and after is less, so the turbine has to work harder to extract the same energy (i.e. spin the compressor to a whatever RPM). So more total exhaust volume would be needed for the same turbine rpm If the wheel needs more flow to get the same RPM due to exhaust, then I'm thinking the demands on the housing is greater so it could become a restriction as a result and you'd hit a brick wall, housing starts glowing etc

Waiting for SR20 results btw

Yep.. I just want a release date :| interesting article btw

Bump for 7163 info

man don't take it to 8psi without an intercooler