Hey guys, Im having a bit of a problem trying to decide which mod I should go with. I was looking to get a kinetix ssv2 plenum, but a couple of buddies told me to do a rear diff gear swap. The 4.08 ring and pinion, any suggestions which would be the better investment for the money? Both are around a little less than 800.00 bucks.

Thanks!

 

..... some searching would help...... forget the plenum and get gear swap and a tune to raise rev limiter if below HR model.

 

Bang for the buck, gears will be better.

 

That plenum is bling only unless you are FI.

 

4.08 is yes

 

What year Z do you have and what are your mods?

Do you drag race?

 

any proff of this that your stating? or is this the whole well i heard from a member who heard from a guy who once said something at a car show while ********ting with his friend?



blue line is with a plenum spacer and red line is with the kinetix manifold

this^^^^^^ is from john at z1 post a whole back

looks to me like the kinetix makes more power.

BUT even with that stated gears would be a better choice and will make the car feel alot faster then with a diffrent plenum so i would go with gears

 

That Plenum is waste of $ I had one with zero issues but not worth it.

 

Depends on how much work you want to do. The gears aren't just a "swap"; they require you to ensure the spacing/backlash/etc. is set correctly. Also, while you're in there you'll want to swap the diff itself because you won't want to get back in there, lol.

 

800.00 for 9hp? i dont think thats much to boast about. Go with gears.

 

what mods do you have already? if your stock, get i/e/spacer/flash

 

4.08
/thread

 

gears

 

ill be selling my kinetix velocity intake manifold on the market place shortly for like 400. my z was rear ended and deemed unrepairable, so keep a look out. its in good condition.

 

Yeah sidewayz I know its a grip of work, I did a gear swap in my mud truck. Only thing that I think about the gear swap is my mpg. I don't want it to have **** mileage. And I know you cant have both mpg and HP. Just curious if anyone who has the gear swap could give there two sense on it.

 

This has already been discussed plenty on the forum, but 4.08 gears don't do much for the car from a performance standpoint with the exception of 1st gear. They add no HP whatsoever, but they will certainly make your car "feel" faster.

 

gears make the car feel great - definitely go that route, imo.

 

I would have to disagree to an extint. On the DE motor unless you have tiny tires you have to shift right before the finish line in a 1/4 mile and doing gears would let you get into fourth sooner and should let you get more mph because you get to make it into the power in fourth rather than shifting and being low in the rpm's for that gear.

But like you said it won't make the car "faster" as in more hp is true

 

You're right that selecting the proper gearing for a 1/4 mile drag will probably result in a faster time if you are able to get as close as possible to redline without going over right when you cross the finish line. However I think the biggest performance jump in a drag race from gears still comes from the initial launch + better 1st gear, after that, it's pretty much a wash between 4.08s and stock gearing.

 

That graph was a rev-up, they seem to make even better gains than a regular DE. What year is your Z?

Not only have we seen back to back power increases but it weighs ~21lbs less than the stock configuration and due to it being stainless steel it doesn't heat soak like the OE.