After installing my 5/16" spacer I noticed slightly reduced throttle response in the lower rpms and from a stop. I decided to put the Power Duct cover back on to see if it would improve things and it seems to have worked. The throttle response is better, but now the induction noise isn't as sexy The spacer does make the induction noise deeper and louder, but not quite as loud as I'd like. On to the Coupe midpipe I guess. Keep in mind I'm not saying the spacer hurts acceleration because at WOT, the car feels great. I just wanted to restore the throttle response in around the town driving. Since the spacer increases the plenum volume, it's only natural for the lower rpms (sub 3,000rpms) to be impacted slightly.

 

Dave,

I totally agree. I had taken the PD off a few weeks ago. It seemed that low end throttle response was lagging a bit. I put the PD back on after a week. Everything was just find after that.

 

I will probably switch back to the stock box soon. I will be curious to see if I notice any enhancement in low end torque after having the pop charger on for over a year. I hope so.

 

if u want your lo end tq just get the ur crank pulleys. That should make your car more alive from the start

 

Actually, I have it. I forgot to list it in my mods. It's one of Dave B's favorites!

 

with the 5/16th, is there now more noticeable power/pull/torque in the lower rpms...the ones used most in city/town driving?

 

i didn't notice any difference w/ low-end performance w/ the power duct on/off with my spacer install. but what i definately did notice is the change in noise (quiter w/ it on...boooo hssss). Power duct is staying off here ^_^

 

^^ i thought the 5/16th was supposed to give more useable power, like in the lower rpms, as compared to the 1/2 spacer which gives power in the higher end?..am i wrong>

 

The 1/2" spacer provides an additional 1 to 2 peak ponies, I believe.

 

Yes, it does feel better around town. I live in Atlanta now and traffic is a bear. The spacer can be felt even under a brisk 0-50 run.

 

^ cool thanks

 

Power duct off, did the throttle response improve over time (aka did the ecu need more time to adjust?)? Or did it never change until you put it back on?

 

Good old Atlanta traffic. It was bad in 1983. What burb are you in Dave?

 

Don't say we didn't tell you so. You don't know everything.

 

Enough already. The car drove fine with and without the duct. The added volume of the spacer reduced throttle response marginally. It was to be expected. You and your elite group never made mention of this. Your group's thought was that the removal of the duct introduced a whole bunch of hot air into the airbox and that you'd be slower without the duct. Unlike you, I monitored the air intake temps and MAF readings with my OBDII logger and saw a minimal change. BTW, my car actually went quicker and faster without the duct. Go figure.