Pontiac Grand Prix Forums : Grandprix

GP_Kid18 · #1 03-09-2009, 03:13 PM

i was looking at some 1.9 zzp rockers and they seemed like a good deal but they also said they cant be used with an aftermarket cam so i didnt like that too much. aslo how will rockers affect my car? will the exhaust sound anydifferent? i also read that it will increase mpg and that just sounded like a mistake to me. any help at all is welcome

thanks

05SS45 · #2 03-09-2009, 03:51 PM

i also thought about the 1.9's but id rather save for a cam!!

DanGTP · #3 03-09-2009, 04:01 PM

I'm assuming you're looking at the modified rockers ZZP sells. You can't use them with an aftermarket cam because a higher lift cam and high ratio rockers together will provide too much valve lift and cause binding.

Rockers will give you more power up top, but will leave idle and low RPM driving unchanged. The exhaust will not sound much different except maybe under full throttle.

As far as increasing MPG's: It's possible due to less restriction in airflow, but you'll also command more fuel during acceleration due to more air coming in.

Bio248 · #4 03-09-2009, 04:05 PM

exhaust note does not change. gives a little more top end. you dont need a cam to run 12s, so i opted to stick with a reliable, very streetable part.

GP_Kid18 · #5 03-10-2009, 01:12 AM

i have seen the "pulley charts" on zzp i believe and they say in order to run this size pulley you need this. when it says you need a cam, will the rockers sub for it?

GP_Kid18 · #6 03-10-2009, 01:15 AM

and also how does a cam change the sound of an exhaust and rockers dont? they are basicly doing the same thing

Sabrewings · #7 03-10-2009, 01:25 AM

Originally Posted by GP_Kid18

and also how does a cam change the sound of an exhaust and rockers dont? they are basicly doing the same thing

No, they're not. Rockers only increase the amount of lift, but keep the stock duration and valve timing. A cam changes valve lift, valve duration, and valve timing. The last two are most responsible for the exhaust sound of the three.

I'm with Bio. No need for a cam if you're not looking for really low times. Rockers with the right springs can provide the needed top end without the extra stress on the valve train a cam and tougher springs will put. Personally, while cam'd cars sound cool at the track, I don't want to drive around all day listening to that at every stop light.

DanGTP · #8 03-10-2009, 01:38 AM

The cam changes the sound of your exhaust because it changes when and for how long the valves open, as well as lifts them higher. The rockers just increase the valve lift.

As far as ZZP's charts go: They're just a guide and not a rule. 1.9 rockers will allow you to run about the same size pulley as a VS cam. So, the answer to that question is both yes and no. Yes, you can run a 3.3 non-intercooled with a set of rockers and other supporting mods (this would be like having a VS cam instead of the 1.9 rockers). No, you cannot run a 3.1 with rockers and no type of intercooler, like you could with an XP cam.

EDIT: Wow! It took me so long to write my response (got a bit side-tracked) that Sabre beat me to it...

DanGTP · #9 03-10-2009, 01:40 AM

Originally Posted by Sabrewings

while cam'd cars sound cool at the track, I don't want to drive around all day listening to that at every stop light.

Awww, c'mon! I love the sound of my XP cam in my DD!

Sabrewings · #10 03-10-2009, 01:55 AM

Originally Posted by DanGTP

Awww, c'mon! I love the sound of my XP cam in my DD!

I guess I want a more civil ride. Not a track beast.

99prixgt · #11 03-10-2009, 12:39 PM

I decided on rocker's because they're more sleeper and the reasons mentioned above. A cam kind of gives it self away

.

Bio248 · #12 03-10-2009, 01:00 PM

Originally Posted by DanGTP

No, you cannot run a 3.1 with rockers and no type of intercooler, like you could with an XP cam.

i take that challenge.

DanGTP · #13 03-10-2009, 02:09 PM

E85 kinda counts as intercooling, too. But.... I still wanna see it happen.

UR LOSN · #14 03-10-2009, 02:50 PM

moved to correct section.

Bio248 · #15 03-10-2009, 03:35 PM

Originally Posted by DanGTP

E85 kinda counts as intercooling, too. But.... I still wanna see it happen.

with the e85 and meth i kinda want to be able to run the 3.0 i have. i will probably just run whatever pulley i can with around 20* of timing though. i have a feeling it will be my 3.2 or 3.1.

GP_Kid18 · #16 03-11-2009, 08:20 PM

Originally Posted by DanGTP

Awww, c'mon! I love the sound of my XP cam in my DD!

do you have a sound clip or a vid of your car? i would love to see, In fact anyone who has sound clips or vids of there car please send to me at
p_youdontneedtoknow@yahoo.com

i would love to see your cars

DanGTP · #17 03-11-2009, 10:03 PM

This is from when I was trying to diagnose a funny noise, but you can still hear the car for the most part.

Random :: MVI_2991.flv video by DanGTP - Photobucket

I have a sound clip I can e-mail to you. It's a .amr file. You'll need something that can play that file type.

Sabrewings · #18 03-12-2009, 02:02 AM

S1X cam, top swapped L36

2004 Chevy Impala LS, DPP Headers, full 3" mandrel- Video

05SS45 · #19 03-12-2009, 12:04 PM

damn 04Detroit's car sounds sick!! i cant wait to hear the L32 in action!!

GP_Kid18 · #20 03-12-2009, 12:43 PM

Originally Posted by Sabrewings

S1X cam, top swapped L36

2004 Chevy Impala LS, DPP Headers, full 3" mandrel- Video

that sounds sweet!

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