VF35 Spool vs MD321H
01 October 2009, 10:08 PM
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01 October 2009, 10:22 PM
#32
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Does indeed Dunx 
The up-pipe is not specific to the MD321H but is designed to work well with GT Spec headers (which many people with MD321Hs are already using).
I fitted this up-pipe last month and these are my thoughts as emailed to Harvey:
Spool - slightly better (earlier). On a sequence of uphill bends near home, I was able to accelerate out of some of them using one gear higher;
Throttle response - definitely better - much better!. Going through the gears, even less response time for car to 'go' after every gear change - virtually instantaneous in fact;
Torque - more mid range thump;
Top end power. Doesn't seem quite as eager but I think that's because of the rise in mid range torque making top end torque seem less; Paul at Zen agrees and the power graph verifies this.
Hope this helps
To the OP, an MD321H with Harvey's up-pipe on GT Spec headers spools pretty much as quick as a VF35 on standard headers and is a massive step up in performance
The up-pipe is not specific to the MD321H but is designed to work well with GT Spec headers (which many people with MD321Hs are already using).I fitted this up-pipe last month and these are my thoughts as emailed to Harvey:
Spool - slightly better (earlier). On a sequence of uphill bends near home, I was able to accelerate out of some of them using one gear higher;
Throttle response - definitely better - much better!. Going through the gears, even less response time for car to 'go' after every gear change - virtually instantaneous in fact;
Torque - more mid range thump;
Top end power. Doesn't seem quite as eager but I think that's because of the rise in mid range torque making top end torque seem less; Paul at Zen agrees and the power graph verifies this.
Hope this helps
To the OP, an MD321H with Harvey's up-pipe on GT Spec headers spools pretty much as quick as a VF35 on standard headers and is a massive step up in performance
I've mostly dialled out the lag of my VF35 at low-med rpm by adjusting the AVCS timing and ignition timing maps to improve the VE while the turbo begins to spool so the power no longer takes a dive and I don't have to wind it up for standing start. Hoping I can do the same on the MD321H. If I can't then the 321 would undermine my 'response' goals. Does anyone have any VF35 vs MD321H dynos for a wrx car, where the other mods are the same?
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