I had some Atkins aux port sleeves installed. (I also had the injectors cleaned and balanced, installed an Exedy clutch, RB header, Bonez cat and RB cat back, new plugs and wires and high flow air filter. I've had the TPS and idle set properly.) I'm having to rev to 3500 just to let the clutch out and it seems to struggle at top end. Is there anyway of knowing if the sleeves were installed properly? Is it possible to turn them 180 degrees without disassembling the whole intake track?

Thanks for your thoughts.

Doug

 

If they were backwords, i would think you would have no problem because you should have low end and no top end. Are you sure you did the clutch right? Are you sure you got the plug wires right??

Sounds more like the plug wires are on incorrectly

 

Agree, the aux ports don't open until higher engine speeds, to increase breathing capacity and modify port timing, so struggling at lower speeds isn't consistent with an issue with aux port installation. Even if the aux valves weren't installed at all, the problem would be more one of poor torque and poor fuel efficiency at lower revs, because intake air velocity and port timing wouldn't be suited to lower engine speeds. Besides a plug wiring problem, perhaps look at whether the injectors were reinstalled properly -primaries and secondaries switched perhaps? That, and vacuum leaks or improper vacuum routing.

 

Primaries and secondaries are the same. So, is there any way to tell if the sleeves are on backwards? Can I turn them 180 degrees without taking the whole intake apart?

 

The short answer is no. You would need to take the intake off. Also if by backwards you mean they are open below 3800rpm and closed above, which is opposite of how they should work. This wouldn't cause the problem with taking off you describe. It would only hurt the top end. You could take off the actuators and wire them to stay in the position they are in and see if your top end improves. If so they may be in wrong. Taking it apart is the only way to be sure. As others have said I would look elsewhere for the problem first. I have no aux sleeves at all and a lightweight flywheel and I can take off below 2k rpm no problem. If you have to rev to 3500 to take of I think something other than aux sleeves are the problem. Check plug wire routing first. Then break out the timing light if they are correct.

 

Seems unrelated to the sleeves. If the sleeves were backwards, the engine would run fine just with a lack of power up top.

Spark plug wires mixed up?

Big vacuum leak?

Injector not firing?