dash wrote: ↑
Wed Nov 15, 2017 1:23 pm
with that mindset, why apply new tech to a pos ca18 fossil ? Don't c the logic in that
a turbo that sees nothing - nothing..... bam! sounds like a sizing problem to me. An archaic T3 lights up instantly on a ca18
which 50 trim, T04E? Stage III exhaust wheel ? Which housing.... 0.48 or 0.63 T3. Ran on a proper fabricated header ?
All this makes a world
Additionally, how many forms of racing, the tach sees under 4000rpm ? If dropping out of boost, something is wrong. Not technology
I do appreciate the first hand feedback tho. Don't get me wrong.
My main point is, new tech doesn't miraculously catapult u into the winners circle
Been down that road, with garret GT, old BW ext tip tech, yada yada. Same narrative all over
See EFRs hyped up here. Veterans with their 9sec street pigs simply say, "why sing it, bring it"
https://www.turbobuick.com/threads/poll ... 705/page-2
Lots of folks run 'big az' holsets on their CA18s. Why? I couldn't find a tq vs rpm dyno.... so I'll use a DSM
Stock 7.8:1 + 272 cams + HX35/12cm. Divided header (1st manifold he ever built).
Datalog in 4th show 27.7psi @3093 rpm! Would u want better turbo response ? car eventually ran 10.1sec with auto trans!!
https://www.homemadeturbo.com/new-membe ... lo-118516/
(Same HX35 has dynod 600 atw on a STOCK 2.0 4g63 + quality valve springs + custom short runner intake + crappy header
that "old" turbo costs $200. I paid $150 for mine. What will a $1800 EFR do for them ??
u always hear the 'u get what u pay for' horse5hit. Neither of those DSMs paid (better call security)
Heck, he's running $90 ebay pistons and 272 regrinds in that awesome 'old tech' street car
We've already suggested a modern engine
We're talking a circuit car here too, not drag setups. It's all application-dependent. BW made a very clear tradeoff where they gave up top end flow for higher efficiency at lower compressor speeds. They also went to some fairly exotic metals on the turbine side and machined the compressor blades thinner than anything I've ever seen, all with the goal of reducing rotating assembly mass. They're clearly targeting the product at circuit racers.
Fast drag cars are about top end flow and don't have to worry about part-throttle response. I'd imagine most of them are running flat-shift with slush boxes as well. Why would
they care about part-throttle, low compressor speed flow if they can pick a torque converter that keeps them in their torque curve the whole pull and they only close the throttle after they cross the finish line?
Precision, for example, has the drag market nailed with their modern aero on journal bearing center sections. They make the opposite compromise as Borg, giving up low speed efficiency for top end flow. Perfect compromise for the application and it's why they dominate the drag market in North America.
On the circuit, put the same (competent) driver in the same car, with different, equivalently-sized turbos, and they're going to lap faster on the modern equipment. Period. Would it be worth the extra money to gain those fractions of a second? I'd say that depends entirely on the race program and the series you're in.
One other thing. I detect an underlying theme in a lot of your posts that all these performance companies are just gouging us and you can get just as good as X from China, but that plainly isn't true in all respects. And it becomes less true every day as the name brand s*** gets more complex.
I can't comment directly on the No-Name pistons, we don't use them, we try to reduce unknowns in customer builds, but the "cost savings" usually show up in fit and finish, and turn out to not be cost savings at all. A very clear example with which I have direct experience is aftermarket valves. The QC isn't as tight with "cheap" valves. Their heights vary more than you get with the pricier outfits like Supertech and by the time you've paid your machinist to check and machine them all to spec you may as well have bought the more expensive parts.
Does that mean the cheap s*** is always s***? No, clearly not always, but it's not like China is some big secret that "they" don't want you to know about.