Help me understand HP potential of S vs TT

Mike@GTM

Lag and boost threshold aren't the same thing. Having a turbo with negligible lag doesn't equate to a turbo that runs out of breath by 4k rpm. Our Stage 1 Twin Turbo Kit is proof of that. Yes, it spools quick, and yes, it starts building boost when you so much as breathe on the gas pedal, but it still pulls all the way to redline. They aren't tiny housings, but they aren't ginormous either.

There are other positive displacement superchargers as well (Twin Screw and Eaton's new TVS) that are more efficient than the old Roots blowers, but packaging on this platform makes it difficult without extensive modification to the hood. Also, due to packaging, most positive displacement superchargers are limited to water/air intercoolers that are prone to heat soak.

Cylinder pressure is cylinder pressure and cylinder pressure directly correlates to torque. Too much of it (regardless of rpm) is a bad thing. Having a responsive turbo system that makes good mid-range torque is no worse than a laggy turbo system that makes the same amount of torque later in the rpm band. The other aspect is tuning. Tuning, tuning, tuning.

There is nothing wrong with wanting a responsive setup. Cars that run on road courses or autox really benefit from having responsive setups since the throttle is easier to modulate on corner exit...especially with rear wheel drive cars. Not everyone is a showboating street racer that wants to have the biggest horsepower numbers on the block. For some people, response is an important factor in their decision on what type of forced induction they choose.

Boosted Performance

[QUOTE=Mike@GTM;2164021]Lag and boost threshold aren't the same thing. Having a turbo with negligible lag doesn't equate to a turbo that runs out of breath by 4k rpm. Our Stage 1 Twin Turbo Kit is proof of that. Yes, it spools quick, and yes, it starts building boost when you so much as breathe on the gas pedal, but it still pulls all the way to redline. They aren't tiny housings, but they aren't ginormous either. [/QUTE]

I am aware of that, but the OP is looking for a "no lag system". Most of the time guys refer to lag when going from say 2k rpm all the way to 7.5k. Of course the there will be lag.



Also something I already know. I used to build s/c kits using the Eaton M62 head units..(the positive displacement should have been in a bracket ^^up there)..I am well aware of the positive and negative attributes of these superchargers, as well as spatial constraints with the VQ.



Yes, I understand that. Maybe the OP needs to explain what he means by "zero lag", as it is different IMO than responsive turbo sytem. I am basing my statements on the fact that he built a twin charged VQ35, with the small Eatom M62 kit from Stillen and the PL GT35R kit. The purpose of that build, was to get boost by 2,000rpm (as I do remember reading it on the other forum). Hence me interpreting this inquiry as low RPM boost where cylinder pressure is extended over a longer period of time due to the low RPM's.

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TopgunZ

Yes. I did have the stillen and loved the POP in the throttle but of course frowned after that. Added the pl kit and it was fun. But wanted more so took off the stillen so I could have more safe power. Now looking at 370 kits I'm looking for a turbo system that has blip of the throttle response as close to a positive displacement sc as I can get.

I guess I like my power as close to on tap as possible. If there was a properly designed tvs for this id chop up my hood however badly it needed it.

Drove a vortech 350 at 400hp and wasn't impressed. Not into centrifugals.