I am very interest to know some opinions from you.
In next months I will buy on from these two inductions.
One is the lexmaul and the other is from regal and designed from Turbo Dynamics and is for RHD cars with c20xe engines, but also fits into my LHD car.
I saw the Regal Induction from close, and I don't impressed from the quality very much. It is rough inside, and also the ports have negative angle (to fit the brake servo in RHD cars).
I never seen a lexmaul from near but possible have better quality (possible, not so routh inside) and the ports have better angle because is made from the LHD cars (Not have problem in brake servo).
But the biggest difference on the two manifolds is that the Regal have, (I calculate from the pictures) that the ports are 5-7cm shorter than the lexmaul. I know that the length of the ports on regal induction is 20cm. So in lexmaul induction will be about 25-27cm.
Also I calculate the standard induction and the ports if it was straight, the length will be 30-32cm.
I know from books that I read that if the ports are short in length on an engine, then it gains top end. If the ports are longer the engine gains on low end. So from that, the Regal induction is designed for more top end performance. But the lexmaul is a better designed in quality (possible less rough, better angles).
Also I know if the plenum of the manifold is big, the gains are significant for top end power. The volume of plenum on unsymetrical manifolds must be about 80% of the size of the engine. But I think in both manifolds the volume size of the plenums are less than the 80%. So the manifolds have a design to work good on the midrange.
So which manifold will work better for engine performance?
Which must I choose if I want to see better gains?
My engine specs are:
c20xe dizzyless, with coscast head porting and polishing espesially on exhaust ports, compression ratio 11:1, skimmed pistons, ARP rod bolts, Adjustable Verniers, k&n panel filter, exhaust manifold SBD Type A, Metallic cat from Americat up tp 210 bhp, custom exhaust stainless steel boxes with a pipe of 54mm diameter.
The future add specs will be:
Inlet manifold from Lexmaul or Regal, camshafts ENEM Z27 (268" duration, 10,8mm cam lift), and reprogrammed chip on the ECU, on the Dyno with Lambda wide band sensor helping.
Pics of the two manifolds: