Rocker Arms

[Liljay2003]

I have a 02 Grand Prix GT and i wanted to put rocker arms on it< i wanted to do split ratio 1.85/ 1.80. Where can i go to get them Split like that all the site i go to have that you can buy just 12 of one kind or that all i know how to do ( zzp, 3800performance, pfyc) So where can i buy 6 of each . and is 1.9 with vavle spring safe for the car. And if theres anybody with rockers already< can you tell the power is different> I have a Cat back exhaust, DhP, with Performance Shift, Cold Air intake> and i'm tryin to get rockers and the bigger Throttle body, I'm tryin to Beat a Regal Gs stock and a Stock 99 deville Northstar. but i want to appear stock with the expection or the Cold air intake< do you think it enough to beat them> 240 hp and 300 hp cadillac

[BNaylor]

Maybe but I doubt it. Even if you went to all 1.9 roller rockers and hi-load valve springs you'll probably only get an extra 10-15HP to the wheels on L36 Grand Prix. And that is in conjunction with mild mods such as exhaust and intake. With a camshaft mod it may be a different story.

BTW - I have a stock '01 Regal GS as my daily commuter/grocery getter and I can blow the doors off a Caddy with 300 hp Northstar. It needs 300 hp due to the weight factor.

BTW - I have SLP 1.8 roller rockers in my GTP and yes there is a noticeable difference. I'll find out for sure when I take it back out to the dragstrip.

[Liljay2003]

What that Website for the rocker you have, And you say you have them on a GTP ? of course your going to Notice it, if you put a pulley on it, you'll notice that too< anything you do to it< that supercharger is going to make you notice it> I want on but i Just aint got the money for a turbo or supercharger right now, I'm tryin to get all this little stuff 1st, ya know so i can still say i'm stock, B/cuz the people i'm tryin to beat know nothin about car and how horsepower is made< all they know is that have the horsepower advantage on me

[BNaylor]

Originally Posted by Liljay2003

What that Website for the rocker you have, And you say you have them on a GTP ? of course your going to Notice it, if you put a pulley on it, you'll notice that too< anything you do to it< that supercharger is going to make you notice it> I want on but i Just aint got the money for a turbo or supercharger right now, I'm tryin to get all this little stuff 1st, ya know so i can still say i'm stock, B/cuz the people i'm tryin to beat know nothin about car and how horsepower is made< all they know is that have the horsepower advantage on me

The web site is 3800Performance:

http://www.3800performance.com/Merch...roduct_Count=0

Absolutely, the L67 does benefit more from valvetrain mods due to the supercharger. Thats why the hp gains are higher. However, remember how fast or quick your GP is or will be is based on the totality of mods.

I recently modded with the SLP 1.8 roller rockers and 3.0 SC pulley and high 12s here I come. My current 1/4 ET is 13.2 and that was with a 3.25" pulley and stock 1.6 rockers. Good luck!

[Liljay2003]

Yeah i saw some for 275 on zzp but they where 1.9 ratio/ if i get thoses i would have to get springs too. But i see theres alot people running Split ratios 1.85 intake 1.80 exhaust and i wanted to do that also but i dont know where they sells them like that. or a site that let you order them like that. Someone told me ZZperformance and they dont sell them split like that I wondering if i have to specail order them,




The 1st time i went to the Track I Ran a 15.6 stock but average i ran 15.7 and the Regal GS stock ran a 15.1 the regal is still stock/ What mod suggestions to be My L36 to high 14s without supercharger or cams or anything i have to take the engine out to do I gettin rockers and bigger throttle body and i already a DHP, cat-back exhaust, cold air intake, 180 tsat,

[BNaylor]

Originally Posted by Liljay2003

Yeah i saw some for 275 on zzp but they where 1.9 ratio/ if i get thoses i would have to get springs too. But i see theres alot people running Split ratios 1.85 intake 1.80 exhaust and i wanted to do that also but i dont know where they sells them like that. or a site that let you order them like that. Someone told me ZZperformance and they dont sell them split like that I wondering if i have to specail order them,

The 1st time i went to the Track I Ran a 15.6 stock but average i ran 15.7 and the Regal GS stock ran a 15.1 the regal is still stock/ What mod suggestions to be My L36 to high 14s without supercharger or cams or anything i have to take the engine out to do I gettin rockers and bigger throttle body and i already a DHP, cat-back exhaust, cold air intake, 180 tsat,

A couple of years back companies like ZZP used to sell 1.85 rockers but I haven't seem them nor do I know of any companies that offer them anymore.

1.8 roller rockers are still a good choice due to availability and not having to do any further valvetrain mods like stiffer springs, etc. What are your current exhaust mods other than CATBack? What about the downpipe and do you have a Hi-Flow CAT convertor? Headers will probably give you the edge but there is the cost consideration to include installation. On the throttle body checkout the ZZP Stage 2 with the modified MAF sensor instead of the Stage 1. You can only do so much with bolt-on mods without having to go into the engine.

[maxwedge]

Originally Posted by bnaylor3400

A couple of years back companies like ZZP used to sell 1.85 rockers but I haven't seem them nor do I know of any companies that offer them anymore.

1.8 roller rockers are still a good choice due to availability and not having to do any further valvetrain mods like stiffer springs, etc. What are your current exhaust mods other than CATBack? What about the downpipe and do you have a Hi-Flow CAT convertor? Headers will probably give you the edge but there is the cost consideration to include installation. On the throttle body checkout the ZZP Stage 2 with the modified MAF sensor instead of the Stage 1. You can only do so much with bolt-on mods without having to go into the engine.

Like Bob says, bolt ons only go so far, the engine output is a function of air in and out, stock heads are a big limiting factor and the rocker arm issue may not realize the anticipated gains, mid range torque is what wins acceleration trials and to be effective cam timing should be changed or some head work done to match the bolt on throttle body and exhaust mods, some of these changes only gain hp at the higher rpm ranges where the engine spends the least amount of time operating especially in a 1/4 mile race.

[Liljay2003]

Yeah i just have the CAT Back with No convertor at all< I had it mess up on me in the pass and i didnt wanna get a new one so i just paid 20 dollars to get it cut off, And yeah i just wanted to do all the little stuff to see can i beat them cars, I wanna turbo charge i'm tryin to finish school and all that stuff b4 i get nasty with it you know, So i just wanna get these cheap Bolt on<s> Do you know anything about the shift Kit < i wanna get that also but i really dont wanna just be everyday street driving and My head jerkin back everytime it shift. I mean when i got the Dhp with the P- Shift i felt the difference but thats not enough for me< but i dont wanna have it shifting too hard< that my everyday, back and forth to work and school car you know< it not on the strickly racein level yet. ( ya'll think those Electric Supercharger do anything< Ya'll prob talkin about me for askin that< but i say one that looked like it had some blow behind it< E- Ram>. But its say only 1.7 psi i'm lookin for 6- 10 psi, But i wondering if it will get me on the line enough to keep up with the GS off the line

[theblurr87]

we had this discussion over on the other site a bit ago..basically it was concluded that no one really knows whats the best ratio for the GT. after zzp came out with the split ratio rockers (1.85, 1.80) they came out with ER ( extended ratio??) rockers where the ratio was prorpietary. they havent sold these in a while but are expected to return..sometime...
DON'T BUY AN electric supercharger they are a waste of money and will probably slow you down

[BNaylor]

I think we can draw a logical conclusion as to split ratio rockers considering just about all the vendors don't sell them anymore.

The problem with determining what ratio rockers work best with your given situation is that it is open to speculation. Plus most people that weigh in don't even have them installed.

If you have a GT it will not be the smoking gun you are looking for.

[Liljay2003]

One the Throttle Bodies< Could i on my Gt get Adaptor Plate if they make one for a gt that will make the Throttle Body Like a gtp and then ugrade the whole throttle body as a GTP like theirs go to Like 72mm or 75mm with the northstar i think and the GT 68Mm< But i'm wondering would that be a good thing to go alot higher of would i thorw the PCm off with something like that or will it even bolt up with the A-P 1st of all. The Gtp stock throttle body is 1 mm bigger that the GT upgraded TB. So i wanna do it big, But i dont wanna fuck up anything < my car might Chock with all that air huh> And i prob wont get that E-superchrager but i was thinkin if i ran Dual Intake one Regular and one with the e-supercharger so that the e supercharger wont block the way of my Continues air flow of the main intake, I can see how it would slow me down? b/cuz it would be blocking the path ( well thats what i think it would be doing)

[richtazz]

The only advantage to a bigger throttle body on an air only intake is MAXIMUM flow. Without a bunch of extra mods, it is useless (except maybe at very high RPM) and may in fact slow your car due to reduced throttle response. On the rocker arms, the stiffer springs required on the 1.9's will offset any performance gain due to the increased friction from the stiffer spring. Like Bob said, IMO you'd be best to go with the 1.8's, but you may be disappointed with the gain you get versus money and time spent.

[BNaylor]

I didn't see if he had a re-programmed PCM or planned to get one. He'll need to get a re-programmed PCM to take advantage of any valvetrain, camshaft, intake system or fuel injection mods. Or maybe even a Powertuner and do it on his own. A lot of these these mods require custom programming even if you have a basic re-programmed PCM like from DHP, ZZP or Intense. You can have all the big mods available but to get the full advantage the PCM has to be programmed for the mods accordingly.

I'd go for the mods that are reliable, cost effective, easy to install and made for your application. Even 1.8 roller rockers and a ZZP Stage 1 or 2 throttle body on a GT/SE are better than nothing.

[Liljay2003]

Yeah i got the Dhp Pcm, And i want the Rockers, So you ya'll think it would be better to go 1.8, ( the main thing is ) I'm tryin to Beat a regal GS <stock> and a 99 deville Northstar<stock>. These are my best friends cars and they dont know what i got> They Both got scared when i should them a Pic of my car topping out< I know the Gs will kill me Stock, so i'm tryin to get all this little shit 1st ( or just intil i get a better job and finish school). So what do ya'll Think about my Chances against these cars.




( i Have)
2002 Gt
180 Tsat
DHP, PCM
Cold Air Intake
No Cat Converter/ w Cat Back exhaust
Ram Air
Performance Shift ( not Shift kit)
Gas Saving Tornado ( i know it doesnt do anything)

[BNaylor]

Originally Posted by Liljay2003

Yeah i got the Dhp Pcm, And i want the Rockers, So you ya'll think it would be better to go 1.8, ( the main thing is ) I'm tryin to Beat a regal GS <stock> and a 99 deville Northstar<stock>. These are my best friends cars and they dont know what i got> They Both got scared when i should them a Pic of my car topping out< I know the Gs will kill me Stock, so i'm tryin to get all this little shit 1st ( or just intil i get a better job and finish school). So what do ya'll Think about my Chances against these cars.


( i Have)
2002 Gt
180 Tsat
DHP, PCM
Cold Air Intake
No Cat Converter/ w Cat Back exhaust
Ram Air
Performance Shift ( not Shift kit)
Gas Saving Tornado ( i know it doesnt do anything)

I see you have the performance shift mod with the DHP PCM so that may help. The key to taking out the Regal GS is going to be in the launch. So practice up. Races that are close are won or lost based on the driver. You have one advantage over the Regal which is your gearing in the differential. The Regal has 2.93:1, you have 3.29:1.

The 1.8 roller rockers will help. The advantage is you can DIY doing the mod in a days worth of work. The ZZP Stage 1 or 2 throttle body will help so I would seriously consider it too.

Another racer's trick is to do something about traction on your front tires. Drag radials will work wonders to get your newly found power to the ground. When cars are closely matched the race will be won or lost in the first 1/8 mile. A good launch will set the stage for a win.

The Caddy with Northstar has a good top end. Some kid driving Daddy's Seville STS decided to see how bad a Regal GS can take him out and he found out that day. As I mentioned before it was no contest in light to light racing. I had him by at least two car lengths up to over 100 mph.

Good luck!