Quote:
Originally Posted by bryce
personally, i think the whole "upgraded twins with different turbo manifolds" is not worth it.
*it will be more costly than a big single turbo
*more points of failure or points where issues can arise, from twice the turbo's, twice the downpipes, twice the oil/coolant lines, twice the wastegates, etc.
*single turbo will be more efficient. log manifolds suck and are not as efficient as a properly designed tubular manifold. the upgraded twins will have higher exhaust back-pressure, resulting in higher IAT's, less power, etc.
*you're going to have just as much lag and boost response as the single turbo kit
*a properly sized, single turbo on the n54 won't lag much worse than stock turbo's, as illustrated by FBIS and vishnu's recent threads. look a the dyno's, especially the ones with the stock dyno over-layed onto the single turbo dyno
*twin turbo's will produce much higher torque, which will kill transmissions, axles, etc faster. a single turbo will have more hp than tq, as shown by vishnu's work. twin turbo upgrade will run more torque than vishnu's kit. personally, i wouldn't want more than 500 ft-lbs to the wheels, like the single turbo kit runs
*i'm not just basing this just off vishnu's kit. they're the first with real, quantifiable results. others will fall in over time. a single turbo is better for the n54, all things considered.
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Regarding the transmission in my case. My DCT will be strenghtened by SSP clutch discs and oil pan will be replaced as well with larger alu one.
During desing, our preferences were:
1, twin-scroll turbine house turbo (like BW EFR) or
two new single-scroll turbo (each for 3 cylinder). I have choosed the second way.
2, One single-scroll turbo is not an option for me, i would not use one big single-scroll on an I6 n54, which does not mean, that somebody cannot fit it and use it.
There are different PATH walk, every PATH has advantages and disadvantages compared to each other.
Laszlo