Harey

I find it hard to come to that conclusion just by looking at those 2 dyno sheets. The powers are basically identical (using hp=kw*1.3) and its is very hard to compare the response of either as they are very different plots. The single is zoomed out so much and with speed at the bottom, the twins graph is too zoomed in and with rpm on the horizontal axis. I probably sound like a whinger, it is excellent info, I am just finding it hard to compare those two thats all.

The pipe that goes from your afm to your turbo, replace that with a metal pipe.

Hmmm just had a quick think about this. What other cars are you comparing it to? Do they use less revs? If they use less revs then, they are actually producing more torque to make the same power. The higher torque figure could be what makes them feel more 'wow'. Torque = 5252 * HP / RPM

I have heard a few people say that the single turbos hit harder than the twins. Are you sure the twin turbos compare exactly in size to the single? I mean air is air? Do they both have even quality of exhaust manifolds etc. Would -10s compare more to a T04Z instead of your -5s?

Oh oh looks like the consensus is convert to big single turbo, the missus is definitely not going to like this one!

Yup but to me it sounds like hes after a rush (bigger top end) more than a responsive setup.

I know what your getting at, the comment he made was misleading. HP = Torque x RPM ÷ 5252 So torque and power are proportional. More power means more torque at the same rpm. Given that we are talking about the same engines we can disregard the rpm part of the equation.

I agree, get it running as is. Heaps of stock RB25s making big power. Keep the money if you do have troubles one day and then build it if it breaks. Awesome project BTW!

So what turbo do you recommend on a stock RB25? You seem to have just disagreed with all of them.

DONT DO IT!!! Then you will have the same problem as Turbo Dave because then anything less than that wont feel fast anymore!

Ash, I think you misunderstood. He just wants SAU to hold the money in the meantime. If he doesnt get the required amount of money X number of months before the day then he cancels it. The only concern was where to hold the money in the meantime. There is no risk on SAU, just the holding of the money.

I like it! Then sell the N1 turbos and spend the $ on more mods

Sounds great, I would be interested!

If the wife doesnt like the sound of upgrading to Garrett turbos, I am not sure if she will like the sound of that! hahaha

His location says NZ so I am pretty sure they are not required by law to run a catalytic converter. As everyone has said, bigger the better, the type of muffler will determine most of the sound. 3" minimum. But yeah guy is still a tool, my 3" exhaust is super quiet. Depends on the mufflers

Hahaha I bet From reading about what you think of the N1s, -7s will just give you more response but not much more top end. You wont get much more of a 'thrill'. I think you should go the -5s. It sounds like your all about the rush and perception of a fast car. -9s are a great overall solution but it sounds like you dont track your car and want the max straight line thrill. It must be hard to get a car to give you the thrill of a big bike. Info from PaulR33's signature: Garrett 2860R-7's 0.42a/r (60.0mm) compressor 0.64a/r rear (HKS GT-SS equiv) = 300 to 330rwkw range Garrett 2860R-9's 0.42a/r (59.4mm) compressor 0.64a/r rear (HKS GT-SS equiv) = 300 to 330rwkw range Garrett 2860R-5's 0.60a/r compressor 0.64a/r rear (HKS 2530 Equiv) = 360 to 420rwkw range Garrett 2871R-10's 0.60a/r compressor 0.64a/r rear (HKS GT-RS Equiv) = 440rwkw to 500rwkw

From the always perfect wikipedia (all are curb weights): R32 GTR: 1430kg R32 GTR V Spec: 1480kg R33 GTR: 1540kg R33 GTR V Spec: 1550kg R34 GTR: 1540kg R34 GTR V Spec: 1560kg

I would also add that its the 'change in torque' that gives you that holy crap feeling. So a turbo with more lag will have a greater change in torque and give you more of a rush. Some people like the responsive linear fast track car sort of power and some people like the nothing nothing oh holy crraaaappp feeling. I think its personal and what you use the car for. I remember someone on this forum posting about going for a ride in the corvette ZR1, he said it felt quick but not mind blowing until he looked down at the speed. A car with constant torque will be very fast and be better at achieving traction but tends to not give that 'rush' feeling.

Simple answer no you cannot get -5s to be as responsive as the -9. They are a bigger turbo. Saving $400 in the scheme of things is quite minor, I would prefer to pay $400 more to have the correct setup you are after. Paulr33's signature: Skyline GTR Twin Turbo - Garrett turbocharger equivalent models Garrett 2860R-7's 0.42a/r (60.0mm) compressor 0.64a/r rear (HKS GT-SS equiv) = 300 to 330rwkw range Garrett 2860R-9's 0.42a/r (59.4mm) compressor 0.64a/r rear (HKS GT-SS equiv) = 300 to 330rwkw range Garrett 2860R-5's 0.60a/r compressor 0.64a/r rear (HKS 2530 Equiv) = 360 to 420rwkw range Garrett 2871R-10's 0.60a/r compressor 0.64a/r rear (HKS GT-RS Equiv) = 440rwkw to 500rwkw

+1 Well said.

$270 for a metal substrate 3" cat sounds great to me. Yeah I think they are definitely worth changing on most cars.

Oh woops yeah full traction in second gear. Only if I redline it and then dump the clutch in second do I get a little bit of wheelspin haha Not dumping the clutch on launch, but slipping the clutch for a smooth launch. Yep super happy its just soo smooth!

Thanks guys so the Bosch ones are better then the siemens then? And the bosch fit straight it to an R34 GTT? Link to Bosch ones: http://cgi.ebay.com.au/EV14-90LB-BOSCH-FUE...=item53ddd4121d I was looking at these Siemens ones: http://cgi.ebay.com.au/SIEMENS-840CC-DEKA-...rts_Accessories

If I launched with 4,000rpm while slipping the clutch for a smooth launch would result in wheelspin but good movement. Anything more was heavy wheelspin and I would have to backoff to get the car moving. I did get the tyres up to temperature before doing this. Also a very smooth road. If your about quick takeoffs on the street with a rwd then i think you should stop at ~200rwkw. If your more after second gear plus runs then keep going in power. I am sure with more power you could just launch with less throttle and still get away ok but i doubt you would beat the 1st gear of a std turbod car. I expected more too! I thought i could just give it hell on a launch and the tyres would laugh at my power.

Yes it is richer which is fine but what about the lower octane content possibly meaning too much ignition timing.