Ok I have a couple questions and comments for exhaust manifolds and intake manifolds. 1st off, a friend of mine and I are building yet another dsm only this time alot more serious than 12's so $ and custom work has come into affect alot more. We are having a buddy of mine (Dave Fry of PSI PROformance) outside Philadelphia custom make 3 inch intercooler piping with v band clamps, an equal length tubular turbo manifold, and POSSIBLY and intake manifold as well.
I'm sure a few of you have given this a shot and I would appreciate any insight on the intake manifold idea. The thing is, he has done turbo manifolds before. He is a big Honda guy who is somewhat familiar with dsms. Here is a link to his 675hp street civic and his 1st crack at an equal length tubular manifold. I trust we will be pleased with the turbo manifold but as for the intake, he has never attempted a sheetmetal intake and any information on the subject would be greatly appreciated.
Here are pics of the manifold... they are in there, just scroll down.
http://www.honda-tech.com/garage?cmd=viewcar&id=1943
I will post up pics of his dsm turbo manifold after he is finished and maybe he can do a couple custom pieces for others here in the dsm community for a fraction of dnp or full race's prices.
Rule of thumb we are going by exhaust wise is
Diameter: 2000cc 1.375-1.75 in
2400cc 1.5-1.9in
This is what we are using...1.9 inches wich is a bit large but for the portwork and because we are using a 2.4L witha dual bb turbo, we shouldnt have lag problems and can afford to go that wide.
Smaller diameter tubes for widest power band and larger size where top end power is more important and sluggish throttle response is acceptable.
Intake is the obvious fat runners for easy engine breathing at high rpms, long runners for bottom end. as for plenum design, it is said that plenum volume of 1.6 times the engine size is best.
How so?
Does this figure include runner volume also?
What about a desgin for even cylinder air distribution? How bout using velocity stacks in the plenum at each runner?
Placement for extra injectors via AEM EMS and spray qualities?
nitrous bung placement?
These are all questions that arise when building a sheetmetal intake manifold. What do you guys suggest?
Thanx
