Steve

cant see why it wouldnt run - how it runs will be dependant on the grind of the cams (lobe centre angle/separation etc).

sounds nice Sly, shame the cat is hurting. I saw a comparison in '21st Century Performance' a book by Julain Edgar, and he came to the same conclusion as you - high flow cats dont flow that high. will be good to see the results with a higher flow cat fitted. What ATS are describing to you is compressor surge, which is a pretty violent sort of thing to happen, and would be accompanied with violent boost fluctuations and a feeling that the car is hesitating/loosing power? is that what you are getting, or am I missing something? congrats again, the R&D, whilst consuming time and money, can be pretty rewarding - and if nothing else, helps others going down a similar path to you:)

sorry this is a day late, but happy birthday big fella - hope it was a good one you old bugga:)

T-man, it should last well past 1pm - takes a bit of time to get the cars up and down plus do the run. Busky, he monitors AFRs during each run, so yeah, you will be able to see where they are.

Hmm, not sure, Matt??? Hope work sorts itself out - if not, come to the dyno day and console yourself with a sausage - I'll make sure I buy coles ones:)

321 so you still good to bring the BBQ?

thanks Matt, I just had a look at the previous dyno on you thread, and the bottom end and midrange looks alot different, certainly feels different. also, to appease one of our mods:) ***Please Note**** Dyno Day is on the 6th of March. T-man, you still good for bringing the BBQ? Enrico, you still good with the TV? Also, does anyone have esky space for some sausages? or perhaps I can just put them in the sun to pre-cook?

Smaller turbine housing - boost will come in earlier, but the downside is they wont have the top end of a larger housing - due to the additional back pressure. Also, with a smaller housing, it is more difficult to control how the boost hits, its either on or off - the net result of this is you would have to turn your boost down to drive on the street safely, and prevent unplanned lane changing. The boost pressure where a turbo is efficient is dictated by the compressor. Buggered if I know how a turbo can be rated at 550hp with 3 different rears, unless they rate at the smallest sized housing - which means the larger ones have the potential to make more. Real world example, I had a 0.61 housing on 3037, boost came in so hard, at around 3000rpm, that the back end would step out at light throttle even in 4th gear and doing around 100kph. Not so bad if you want it to, but not so good in traffic. I am not sure about top end, but the turbo did make 256rwkw at 1 bar with an quick tune. same turbo with 0.87, 1.2 bar (17.4lbs) at just under 4000rpm. The car pulls pretty hard from around 3500-3700, so around 500 or so rpm more lag (after changing to a higher flowing exhaust). I have 22lbs set all day, and can control the boost with the accellerator pedal. turbo now makes around 285 at 17lbs and 321 at 22lbs (around 1.6bar). I much prefer the 0.87 housing. Much more lag though would be a bit too much IMHO. If you want my recommendation for a 3040, I would say go the 0.87. Merli had a 3040 with 0.87 turbine AR on his R33, it would be worth asking him what he thinks too. Steve

absolutely whatsisname, if you really want to beat me all you need to do is turn my boost down when I am not looking, then remove my hand controller - dont even have to bodge figures - or, you could just block off my CAI intake pipe during the run:) that should do it.

thanks guys Robo's yep standard internals DVS33T, I think there is a bit more to be had from the 3040, best to keep an eye on B-man's results, and you will be able to tell B-man, yeah they are killer turbos. I am not sure if the way it comes on boost is a difference between the turbos, quite possibly, but also it may make a difference that I have stock internals, AF ratios are appropriately rich around there (mid 11s) and the timing is somewhat conservative - just to be on the safe side. Clint32, not sure, I really didnt want to go any further, cos I am chicken, and dont want to rebuild. Didnt a top secret GTR make around 700kw with two of these? But then again, they would have had porting, matchported bits, bigger cams, 2.8L bottom end etc. Boost comes in alot earlier, and top end seems to be breathing better with the upgrades (compare the dyno on whatsisnames rebuild thread in the SA section). Driveability is greatly inproved - chalk and cheese. I am not sure how it will go at 1.8, but it did spike to 1.89 this arvo, and lit up the tyres at 120ks (using 2 way diff), in a controlled environment of course:) Benm, it really isnt too bad on tyres, as long as you keep away from WOT, but you can regulate the boost very easily with the right foot RNS11Z, it goes funny cos the biggest wastegate spring I could get my hands on is rated at 0.72bar, and I am running 1.6bar - the poor old solenoid has a bit of trouble keeping the boost nice and smooth up there as far as I can work out. It dips as the wastegate opens, then goes up and down as the boost fluctuates a little, around 1-2 lbs. I could probably spend more money getting another spring made, and redynoing, but I am quite happy the way it is. Besides, this gives me the option of turning the boost down for a lazy 225oddkw at 12lbs, for when the wife is driving:)

Just got my car dynoed after making adjustments that I thought were holding it back. Mods, injectors, fuel pump, 256/264cams, trust plenum, hybrid cooler, power fc with boost control, 40mm ext gate, custom manifold, K&N pod with CAI and enclosed box and a HKS 1.6mm metal head gasket to drop CR to 8.6:1, adj HKS exh cam gear plus driveline and sus mods but they dont really pertain here the car made 321rwkw at 22psi, 1.2bar at 4000rpm. whilst the boost comes on a bit savage, it is easy to control with the throttle, so loss of traction is an option. it has around 5psi at 3000rpm, and around 10 at 3500, then turbo starts pulling really hard. after retarding by 4 deg on exhaust, I picked up around 15kw in the mid range with no loss in power anywhere else. due to some fantastic tuning by Shaun of Boost Worx here in adeliade, off boost driveability is pretty awesome. The car just wants to go:) comparing to the dyno of my car with stock turbo and 200rwkw, at 80kph I now have around 15kw less, at 100kph, they are even, then it just gets better for the new turbo Big thanks too, to James of D1 Garage, for all his advice and help getting parts.

it was interesting. although I got a higher figure than matt, he has up to an extra 60kw midrange (shaun overlayed matts dyno) - but 500rpm later (or there abouts) the tables turn. car feels so much stronger bottom end, light throttle cruise and coming on to boost. He doesn nice work (shaun). Should have listened to you earlier Lachlan:)

Car got dynoed today, I am ready:p had a chat to shaun at the same time, he said he will be able to keep a track of the cars, and print out dynos at the end with a 4 or 5 different cars on it, so we can see comparisons of mods and the resultant power output. should be a fun day, and give us a great resource for people wanting to mod, so they can see what sort of difference to expect from upgrades:)

Joel, if you go the smallest housing, you will most probably either spend alot of time going sideways in the traffic, or alot of time driving around with low boost

393Nm, thats some healthy torque.

230hp, if at the wheels is around 170kw and not too bad for the mods you have. The engine makes 250bhp stock. sorry I am not too familiar with torque in ftlbs, so I really cant comment on that one:) Just remeber though, that if you run in a lower gear than 4th, there is greater mechanical advantage. Torque, being a function of power and rpm, will therefore be higher - dont know if you took that into account?

more like for once:)

think they actually go down to 0.61, as all the hks GT30s use the same turbine housing.

www.d1garage.com have a couple of toda lightweight flywheels to suit RB for around $350

only good if he does back to back runs with and without it though.

Hmm, did anyone else here notice Dean has been asking questions on the performance forum about how to use tolulene?

Sprung dean, dyno day coming up and who goes shopping for tolulene???

nice work B-man, got turbo specs? it certainly hits pretty bloody hard, will be good to see the final tune results.

Ngk

cant wait to see that, hope it goes well.