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I took the c43 manifold apart and ported all the squares inside. Made them a bit bigger and matched the top portion to the bottom one for smoother flow. Than I ported the openings of the intake to the gasket. Than i opened up the ports alot, made them bigger. The difference between the stock and the modded one is night and day.
So maybe the c55 manifold was modified in ways an eye just cant see without taking both apart. Just a thought, would be great if the c55 manifold is better. I would buy one and compare than modify it and see what performance I gain.
Good morning all, I heard there was some discussion on the manifolds so I popped in to check out the thread. To be clear, my engine came out of a clk55. We kept the intake manifold that came with the engine when we did the swap, so my dyno numbers reflect a change in the airbox only. The 283/283 numbers were with the C43 airbox, the 295/335 numbers were with the w203 c55 airbox. The intake manifold, I'm referring to the plenum between the cylinder heads, remains the same. I hope this clears up any confusion.
Hard to believe the c55 air box made 52 pounds of torque. 12HP I believe but not the TQ. There's been dynos on that box vs renntech and renntech made 10HP and 10-12TQ more. I tested that box on my c43 and really didn't notice to much difference. After modifying it than I did notice and improvement but not 52TQ improvement.
Anyone wanting some real power and performance contact me and I will set you up with mods that will shock you. Install these and you WILL have the fastest c43 around, with or without the 5.4 upgrade it will be FAST. Just please contact only if you have the funds and very serious.
Good morning all, I heard there was some discussion on the manifolds so I popped in to check out the thread. To be clear, my engine came out of a clk55. We kept the intake manifold that came with the engine when we did the swap, so my dyno numbers reflect a change in the airbox only. The 283/283 numbers were with the C43 airbox, the 295/335 numbers were with the w203 c55 airbox. The intake manifold, I'm referring to the plenum between the cylinder heads, remains the same. I hope this clears up any confusion.
Hi again, I agree that the tq number is outside of the normal standard deviation. I certainly did not expect that much of a gain so it is very likely I was down on power in the beginning. Either way, now it appears to be in line with what a stock 203 c55 makes based on dyno sheets from the 203 c55 section on this forum.
Anyone that has ever handled a genuine Callaway Corvette DYMAG wheel fitted to the C4 Callaways will have noticed just how light they are for the same reason, when compared with the GM A-Molds, which were pretty light weight too.
New intake manifold installed last week along with new knock sensors, the other intake manifold had a vac leak and also the linkage for the flaps was worn, so on side was shutting, but the left bank was not shutting all the way.
1998 C43 w/ 55 swap Wavetrac LSD and 6-Speed manual
Originally Posted by Alex33
Good morning all, I heard there was some discussion on the manifolds so I popped in to check out the thread. To be clear, my engine came out of a clk55. We kept the intake manifold that came with the engine when we did the swap, so my dyno numbers reflect a change in the airbox only. The 283/283 numbers were with the C43 airbox, the 295/335 numbers were with the w203 c55 airbox. The intake manifold, I'm referring to the plenum between the cylinder heads, remains the same. I hope this clears up any confusion.
@Alex33 or anyone else running the 203/209 airbox - how did you do the tubes from the front of the car to the box? I combined a set of C43 and 203/209 tubes - at the front/intake are the C43 tubes and at the airbox the 203/209 tubes . It fits...but I think they are too stiff and not flexing enough with the engine. When I really hammer on the car the box pops loose at the back where it attaches to the T/B. I'm wondering if my "combo" tubes are too stiff b/c where the 203/209 tubes fit inside the C43 tubes. During the 55 swap I did upgrade to new 211 E55K engine mounts - so I don't think that is the issue. I've got some ideas on how to attach the air box more securely but wondering if there is a better option for the intake tubes. The 203/209 box is also closer to the firewall. I could discretely remove some material where the two halves are joined together and gain 1/8" or 3/16" which may help.
(1998 C43 w/ a 2003 CLK55 engine - Wavetrac install starts this week!)
Talking of intake manifolds, check these ITB for our M113 engines Guess that should improve breathing and I can imagine that with some cams and worked heads we could get some decent extra power
1998 C43 w/ 55 swap Wavetrac LSD and 6-Speed manual
Originally Posted by Alex33
We used trimmed 210 E55 intake tubes on mine.
Have a picture by chance? I'm guessing the 210 E55 has the same style tubes w/ the square opening and angle as the C43 but longer? So when you cut the oval airbox ends off the 210 55 tubes they were still long enough to fit?
(For those that don't know - the 203/209 55 box has round hose ends at the airbox as well as a different shape at the front.)
thats so crazy, i was told about these intakes today and i see it again here. I want this intake pretty bad though, for the intake noise above all else
what a shame, at almost 8k USD for an ITB set up for the M120 with "Carbon airboxes and trumpets, fly by wire unit, TPS, injectors, shaftless throttles and complete bolt on ECU kits with wiring all available separately." this seems pretty cost prohibitive compared to the power increase you would get. I don't see any vacuum fittings on these drawings or on the photos of finished product for the m120 so id really love to see what work would be needed to make this setup work in our cars, especially considering that they said the car would need an aftermarket ecu to be able to run this.
Speedybenz was on the right track but a copy of the SLS intake would probably be the easiest way to have velocity stacks with a dual throttle body setup but an ITB setup sounds like a lot of work and I dont know how to figure out if it would be worth it to even try
08-04-2017, 08:30 AM
Guess that should improve breathing and I can imagine that with some cams and worked heads we could get some decent extra power
