led-panzer's 1984 300D 4-speed
led-panzer's 1984 300D 4-speed
I never drove the HE221. I chose it because it was better matched to the 6mm pump in terms of power capacity and driveability. 6cm exhaust housing.
I was enthralled with the idea of making real power, and building an actual "superturbo", but I couldn't afford 2 pumps, so I posted the for sale ad for the 6mm to see if there was interest. It sold in 24hrs. Accordingly, I sold the turbo to go with it, which sold in less than 24hrs. Boom, I had $1,850 to work with.
Shipped my spare M pump to Goran, told him my goals, he put together a 7.5mm pump with 160cc max, and full fuel to 6000rpm.
Contacted F.R.A.S about an exhaust manifold, got that ball rolling.
Talked to Alcaid, the Holset guru, about a 300hp turbo. He said a 12cm exhaust housing would be needed. Well, I already had a 9cm and it worked quite well. With a bigger pump and proper exhaust manifold, it shouldn't be drastically different to the HE341. It may even get rid of the on/off manners of the HE341.
So I chose a turbo for absolute power, not driveability, though I do not believe drivability will suffer too much. If the lag is too great and I'm not happy with it, I have an idea about putting an M90 supercharger where the A/C unit mounts. We shall see.
I can see why you want boost so low in the rpm range, with a stock pump you really only start moving when the boost comes on. With a modified pump, the whole dynamic of the engine changes, it's much peppier out of boost.
If you get a modded pump, I think you'll find that HE211/HE200WG too small, unless you want to compound it. While the response will probably be fantastic, it'll choke in the high RPMs.
My destination will be a dyno showing 300hp or greater at the wheels