It could be VERY possible the intake system including the charge pipe & manifold are a source of restriction. I'd suggest a ported intake manifold & tapered throttle body.
These wont however solve your current lack of power issue you describe.
I'd really like to see a a/f graph and a torque graph if you have them
Im also guessing it could be lack of compression...
but i have CTR pistons in B18c block, that should give me at least 11.8:1 or 12.0:1 in compression ratio. Head was shaved by 3 thou and block was decked by 5 thou. But i am only getting 225 psi for all 4 cylinders... does it sound abit low? cuz ive compared with another stock jap spec B18cR motor and he has got 250psi with all 4 cylinders. Anyone with similar setup can tell me what sort of compression reading u r gettin? thx!
p.s how much does it cost to port out the intake manifold?
as long you have a good compression on all cylinders, i say the rings are fine. gauges will never be entirely accurate. have u tuned the cam gears? i didnt see the dyno graph? i was under the impression todac's needed plenty of revs behind them to make power.
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james has the image of my dyno chart, which he will post it up soon when he's free... =) Cuz i dont know why this forum is not allowing me to upload any file....even i have decrease the size to below the limit.
james has the image of my dyno chart, which he will post it up soon when he's free... =) Cuz i dont know why this forum is not allowing me to upload any file....even i have decrease the size to below the limit.
email it to wynode @ ozhonda.com and I can upload it for you.
Thanks for urs participation...
I drive a EG civic with type R motor. Recently had my engine rebuilt:
Head ported/polished
Standard type R intake manifold/throttle body
Toda spec C cams
Spoon cams sprockets
CTR pistons
Compression ratio approx 12.0 to 12.3 (according to some website's calculation)
Sard fuel regulator
Motec ECU
Ive juz gone for another dyno tune this morning with a different tuner....no gains in HP / power curve. I've attached a dyno graph here so u guys can have a look. You will notice when vtec kicks in at ard 6000rpm, power curve is not ascending as how it should be.... have a look and u'll know what i mean.
My tuner was telling me that one of reason that caused losing power in vtec band is because my type R intake manifold is not sufficient enough... is that correct? cuz i always believe that type R manifold would be sufficient even for Toda C cams or other high lift cams. Another thing we could think of is my cams are not correctly set. could this be the case? if it's, im in big trouble, that means i have to rip my engine apart and re do the cams again which will prob me cost me another $1k??
The following is probable: Cam timing is incorrect.
Adjust with cam pulleys - correct setting data would have been included with your camshafts. If this is done wrong, power suffers.
Time to set correctly is approx 2hrs when already installed.
TDC guage, dial indicator & magnetic base are essential. Vtec swap point is too low.
(Average swap for Spec C's in B-series is 7000+rpm)
Regarding intake manifold.
The std ITR manifold & std throttle are good to 240hp (engine)
Show picture of graph to better explain issue.
Other concerns can be mixtures, ignition timing & exhaust system.
TODA Performance Australia Pty Ltd TODA Racing - FIGHTEX - MFactory - HALTECH - EXEDY Race engines, Dyno tuning, Licenced workshop, Parts.
P:0401869524 email: toda@todaracing.com.au
If toda C's is only good at swapping vtec over 7000 rpm... and my engine can only rev up to 9000rpm (stock retainers), am i benefiting the max power of the cams? would i be able to set the peak power point at 8800rpm? so that means i only have 2000 rpm of vtec zone in every gear to play with.... enuff?
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Originally Posted by ken_wsw
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