Rotex Vs CT Engineering!
Joined: Dec 2001
Posts: 39,548
Likes: 11
From: City Of London / Knebworth
Originally Posted by punchdrunk,Jan 2 2010, 07:47 PM
If you look at dyno graphs of SC'd cars, they make peak power at 9k+ rpms. They don't make much out of VTEC, then they surge to redline. I just don't know where one could drive on public roads to utilise the power.
My car hits VTEC at 4250 revs and I have never had a problem using the power
HTH
Joined: Mar 2001
Posts: 31,181
Likes: 58
From: Hertford
Indeed: that the SC is fighting against the limitations of the VTEC system means the car does have useful extra torque right down the range.
Lowering the VTEC point allows the SC to work far more effectively and avoids the almost dangerous surge & 6000 RPM.
Either Turbo or SC; it's the VTEC which causes the limitations to the tuning, not the FI itself.
Although I'm still prejudiced in favour of NA for throttle response, it can be pretty good on either FI if correctly set up.
Still a lot better than many a 'production' car with FI though...
Lowering the VTEC point allows the SC to work far more effectively and avoids the almost dangerous surge & 6000 RPM.
Either Turbo or SC; it's the VTEC which causes the limitations to the tuning, not the FI itself.
Although I'm still prejudiced in favour of NA for throttle response, it can be pretty good on either FI if correctly set up.
Still a lot better than many a 'production' car with FI though...
Member
Joined: Apr 2004
Posts: 33,838
Likes: 23
From: Sunshine Coast - England UK
I guess a lot of us do track days, so more speed is good 
IKWYM about being too fast for roads, as I struggle a lot int he Evo (although you could escape from London) but the performance can be extracted on the right roads.
THere are also loads more powerful cars than an S/C S, so there must be some point in them.
IKWYM about being too fast for roads, as I struggle a lot int he Evo (although you could escape from London
) but the performance can be extracted on the right roads.THere are also loads more powerful cars than an S/C S, so there must be some point in them.
Joined: Jan 2006
Posts: 20,788
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From: location, location
Can some enlighten me?, I cant understand why so low with vtec engagement on the supercharger (esem's) unless you have a tubular manifold too?, is it to stop the surge of power when vtec engages???- I know too low on N/A and you'll lose power swapping over to the other cam too early.
My car is obviously N/A but my vtec is set at 5200rpm (was the best point i tired on my car for power and smoothness no vtec jump
) but i have a aftermarket tracysports manifold etc.
Punchdrunk, your statement doesnt make any sense unless I'm reading it wrong for your reason of fitting 4.77 gears.
My car is obviously N/A but my vtec is set at 5200rpm (was the best point i tired on my car for power and smoothness no vtec jump
) but i have a aftermarket tracysports manifold etc.Punchdrunk, your statement doesnt make any sense unless I'm reading it wrong for your reason of fitting 4.77 gears.
Former Sponsor
Joined: Feb 2008
Posts: 547
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From: SILVERSTONE
This might give you an idea about the vtec effect on Rotrex supercharged cars. There's more than enough boost below normal vtec. So if you bring the vtec down the powers there if you want it. If you stay off boost you stay on the low cam at whatever revs.
[media]http://www.youtube.com/watch?v=G_WfFLJ2Gz4 [/media]
[media]http://www.youtube.com/watch?v=G_WfFLJ2Gz4 [/media]