Jump to content
HybridZ

L6 EFI intake design, and turbo's


Guest JAMIE T

Recommended Posts

Guest JAMIE T

How do you think a shorter runner intake would work on a L28et. I think the stock EFI intakes look too big. I would like to make an intake that has large diam. runners, and larger than stock plenum, but shorter runners. I want to clean the engine compartment up, and simplify IC tubing routing. The tubes under the intake manifold look cluttered, and I hate clutter.

Link to comment
Share on other sites

Guest Zcarsmakemyheadhurt

Sounds easy len, I used a short runner on my car when I busted my current intake in half on the NOS. I didnt like it I didnt even take it to the track I was so disappointed.

Link to comment
Share on other sites

Guest JAMIE T

LOL, that's why I posted this question, so I wouldn't build a manifold that sucked! Hahaha.

 

I'm just one of those Rodders that must make something. Anyone can bolt parts together, but I'm a talented fabricator who likes to make trick stuff. Come on guys, there has to be SOMETHING I can make! Right?

Link to comment
Share on other sites

From my experience I think the problem may be this, in most cases a modified manifold will outflow the stock manifold. However, it may become too much as it is not balanced with the ability of the stock exhaust manifolds flow capabilities and the rpm limits of the motor. The cam may also play a roll in this phenomena(sp?). Also, because the L is not a high revver in most cases, the shorter runner cannot be utilized because of the rpm limits and thus the low end power is hindered. Only after I made a custom intake/exhaust and cam did my turbo motor pull strong up to 7200rpm and never peaked hp. Anyway, I think the best option for most is to cut off the backside of the plenum and port the runners where they meet the plenum and then slightly increase the plenum volume when putting it back together.

Link to comment
Share on other sites

Best solution is a staged intake; long small runner primaries, coupled by ignition intervals, staged with a short, larger runner, single plenum stage 2 manifold, regulated by airflow volume (rpm). Manifolds designed for a specific rpm range typically give something up at the other end of the range, i.e., excellent low rpm torque precludes good high rpm torque/hp. A staged intake is a way to get around this. DAW

Link to comment
Share on other sites

Guest Zcarsmakemyheadhurt

My combination ran a best of 11.49 @119mph with stock injectors, turbo and fuel computer. That was with a intake that was opened at the plenum ported and welded back together. There are some details to the job that I can not disclose due to national security, but after the backfire I increased the plenum area to accomidate the 60-1 hi-fi. Turbo size matters when porting the intake.

 

Alex "the bomb" Costa

Link to comment
Share on other sites

I am partially done fabricating my new intake. I used a 280zxt intake and cut the runners about 2" off the flange and then decked it on a mill. I milled the webbing between the runners down an additional .200" to allow for welding around each runner. I then traced the gasket onto the flange side and instead of hand porting I used a boring bar to remove as much material as possible. I bored it to 1.375" and the port is approximately 1.425". I will then weld my 1.625"(od) mandrel bent aluminum tubes to the decked flange. These tubes are about .100" larger ID than the gasket, but I have 2" to merge from the tube to the flange. Anyway, coming along as planned and will post pics some time soon.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...