JohnA

The ARC unit doesn't look too bad. Do you happen to know who sells them mate?

I piss in general mate Takeaway, too In the original post, I pointed out myself the quality of the CW unit. The question in this thread is What other alternatives have we got out there? If we can stop chasing our tail and repeating the obvious, maybe somebody will come up with a relevant answer.

£600 now, shame that the price hasn't adjusted with the times... I'd like to avoid a FMIC because the radiator ducting will go awol, the aircon will be unhappy, and the whole underbonnet airflow balance will be upset. The stock SMIC has a nice exit for the heated air, away from the engine bay. The frontal area is not mega-large, but then again that's not the most important factor in the whole recipe(no matter what traders of FMICs will try to tell you) It's certainly big enough for the modest power expectations I've got, and with pre-compressor water/methanol injection the whole setup can behave like a monster FMIC without the fitting aggro (I've done this before) Pace haven't yet bothered to respond to a similar query, they're making too much money apparently...

You missed the 'nowadays' bit mate £600 is approaching 10% of the car of a used supra nowadays Thanks for the input though

If someone wants to avoid fitting a FMIC, what options of a replacement SMIC are out there? I know of the excellent CW units, but the price is a bit of a downer (considering the total value of the car nowadays) cheers guys

Very nice, I'll do this as soon as I get the keys to the soop (later this week)

Yeah, why not? is there any thread with membership info?

Cheers mate

I'm trying to post a thread in the 'parts wanted' section and I cannot. Is this a 'members only' function, or are my cookies fecked? cheers

That's on a boat! This guy thinks that two relatively small turbos chained together can produce airflow that is almost impossible to achieve with massive units connected otherwise. I've got my reservations on this one, although efficiency could go upwards, as more energy will be extracted from the exhaust gases.

I think there is a fundamental flaw in his assumptions though. If not, surely the jap designers would have gone for something similar...

good one eyefi, that's closer to what I had in mind actually. Interesting read:cool:

Thanks Ian. I've been studying the sequential setup from the manuals on mkiv.com Quick question for you then: When people increase boost they typically do it by manipulating the single wastegate at #1, right? That's done either by intervening in the pulsing of the wastegate solenoid, or by lowering the exh backpressure - effectively crippling the flow through the tiny wastegate. (please correct me if I'm wrong!) The question is:D Does this 'upping the boost' affect the pressure balances during the transition period of #2 and back again? I.e., does the typical operation of 'raising da boost' make any of two turbos operate in a way it wasn't meant to? Not just overspinning (that's expected!) but spooling up abruptly, that sort of thing...

looking closely at the diagrams I can see that at high revs, each turbo is fed by three cylinders, yet another blow for the 'bigger 2nd turbo idea' However, it could be a hybrid with the same turbine and a larger compressor, that might work, wouldn't it?

Thanks Chris. I guess it's the pressure balance for the single wastegate to operate properly, eh?

Hi guys, I'm not a regular poster here, mainly a lurker. This is a question aimed at the more technically clued-up. Has anyone tried to run more boost simply by swapping turbo #2? (I know how the sequential system works, that both turbos are the same, blah blah...) I find it surprising that there is no reference anywhere (that I can find) on the above idea. To me it seems logical to keep turbo #1 as is, and only upgrade -and run at higher boost- turbo #2. Wouldn't this keep the transition intact, and stop overspinning of turbo #1? ...or does the lack of wastegate for #1 make this a non-starter? If so, surely a pressure valve could help #1 from overspinning, right?