
Originally Posted by
DrMerl
Something(s) pretty sweet about the DAZA, a great heat pump! =) Nice to hear there's a mid step with a hybrid to tangle with with some of the street stars before going to a build. Even the stock turbo with all the goodies is spicy enough to play with 95% of the random car encounters, but there's always a bigger fish.
How is the power curve with the larger turbos? While I like the torque of the stock turbo, sometimes it's goofy to modulate the torque when I don't need it all, it's kinda like a light switch. Does the slightly delayed boost curve of the hybrids make the overall power delivery curve smoother? More drivable?
So, I have a TC800XT and my wife has a TTE855. I find the spool on those to be pretty much identical. There is the slightest bit more lag than with the stock turbo but, nothing at all that would detract from enjoyable street driving. There was someone on Facebook that showed the difference in spool/power production of a TC800XT vs the IMS850. Basically throughout 90% of the powerband, the TX800XT was able to spool quicker and produce power sooner than the IMS850. But, the IMS850 carried better up top whereas the TX800XT starts to fall off around 130-140mph in comparison. Now, all of this is largely moot with a simple downshift or using RAL if you're concerned with the lag of a full frame. The power will hit very similarly to a positive displacement supercharged V8--I should know, I've owned a few. But, for those out there that don't want to use RAL, the hybrids will still offer far better daily driving characteristics and immediacy in torque delivery.
But, this is all on the upper echolons of things for these cars. If I'm trapping in the low 150's, per se, in the quarter mile, the IMS850 may carry a bit better and get into the mid to upper 150's on equal setups. But there are extremes for every case. There was a guy I know trapping in the 160's with his TC800XT and running mid 8's. But that's not for everyone, you know? Same goes for the IMS850, those can be pushed really, really hard to make power but, you'll be looking at reducing the lifespan of the turbo to make those figures.
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