bleunetizen

iTrader: (3)

I currently run AAM spacer in my non-revup motor.

I was always skeptical if those gains people post on the net are actually from better airflow or simply because the fuel mixture leaning out, taking the engine a bit towards 13:1 ratio.

I put them in 3 years ago and just forgot about them, then I somehow got to give it another thinking if its actually doing any good for my setup.

I currently run tomei 268deg camshafts intake and exhaust.

From memory those revup motors were using non-revup plenum added with ported manifold or something for whatever reasons (mrev2 or something if i remember correctly).

And also remember that people saying 'plenum upgrades are just for midrange'.

Now, is there anyone who had this experiment? the car now revs to 7200rpm and I was wondering if the plenum spacer is actually hurting my performance instead of helping it.

wannabuy350z

iTrader: (27)

I dont see why it would hurt your performance. do you have an EMS? a/f gauges

Chef-J

iTrader: (58)

have you run dyno?

bleunetizen

iTrader: (3)

Yes I do have a wideband and I dyno tuned my car with the AAM spacer.

I do not see why it should hurt performance either, but I've read several posts saying that plenum spacers hurt performance of revup motors. I wonder if the same thing applies to cars with different cams with redline raised to 7000+

Hydrazine

iTrader: (53)

By itself, a spacer doesn't do anything on a REVUP lower plenum, but they certaintly will work on your engine. Fully stock or fully modified.