new upper plenum

bluidvl · May 24, 2006

just bought a true flow upper plenum it's the dragon plenum and a 70 mm tb am i going to have to get the computer tuned.sorry new to the 4.6 thanx and i did search the posts.

Kilgore Trout · May 24, 2006

No, but make sure the voltage is correct on the TPS and reset the PCM after the install.

bluidvl · May 24, 2006

thanx man same as 5.0 oh by the way the car is a 98 gt

Pennywise2 · May 24, 2006

McTeague said:
No, but make sure the voltage is correct on the TPS and reset the PCM after the install.

+1 Your PCM will relearn your new mods after you reset it.

hotdog71 · May 25, 2006

IMO you only need to check the voltage if you encounter a problem.

+2 Your ECU will learn new AF ratio's after you re-set it as stated above.

loosescrew79 · May 25, 2006

If you disconnect the battery while the install, the computer will reset itself when you turn the vehicle back on. This way it won't take as long for the computer to re-learn the new settings.

shallowreef · May 25, 2006

I have the dragon performance TB and Plenum and i don't know about you guys who have accufab and what not but the dragon plenum whistles like a train. when its cold. Once it heats up its not as bad but until then it sounds like you have a whistle under your hood. Its still a great product and performs well. Its just that damn noise can drive you nuts sometimes.

hotdog71 · May 26, 2006

Turn up your radio,,

sorry can help there I went with 75mm BBK TB/P combo

Satin Silver GT · May 26, 2006

I don't hear any whistle on my Accufab set up.

TrueBlue03 · May 26, 2006

i installed TB, Plenum and CAI all together and still do not hear any whistling or sucking noise at all while driving

....but maybe thats just because of my exhaust

shallowreef · May 26, 2006

Thats wierd that you guys don't hear that. Could i have a leak?

I talked to the owner of dragon performance and he said it was normal. I also heard that the little divider in the middle of the plenum causes the whistleing noise.

I'm confused.

DTNODYA · May 26, 2006

shallowreef said:
Thats wierd that you guys don't hear that. Could i have a leak?

I talked to the owner of dragon performance and he said it was normal. I also heard that the little divider in the middle of the plenum causes the whistleing noise.

I'm confused.

You may want to make sure that your bolts that hold the plentum to the intake manifold are tightened to the correct torque specs. I think it's around 6 ft/lbs or 75-107 in/lbs .. but don't hold me to that ... my memory sucks.
Check your manual/haynes/etc., and make sure the bolts are snugged.

I had a similar issue with whistling and it turned out to be a loose (not like hand turning loose) bolt.

It's worth checking ...

TweekedGT · May 26, 2006

shallowreef said:
Thats wierd that you guys don't hear that. Could i have a leak?

I talked to the owner of dragon performance and he said it was normal. I also heard that the little divider in the middle of the plenum causes the whistleing noise.

I'm confused.

Mine has a slight whistle but mostly at WOT. It's just the higher volumeof air moving. If yours is real loud I woud check that out.

4.6_02_Black_GT · May 26, 2006

I have an Accufab TB as well..if I listen real close sometimes I hear a very slight whistle at part throttle.. I kinda like it.

bluidvl · May 26, 2006

cool thanx guys for all the input

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