LS1FIRE

iTrader: (1)

What are the typical gains for 1.8 rockers? I am thinking about ugrading my valve springs and pushrods.Also i plan on doing a cam in the future what are the limits with this rocker? Will the 1.8 rockers simulate a cam effect? Will this throw a code? What is everything i need to know when doing this mod? Is a tune neccesary? Some info would be greatly apreciated.

luv2spd

iTrader: (1)

Well, I think you should just hold off on those for now and put that money towards a good cam package. Just get some extra lift built into the cam if you want it. The gains aren't worth the price for 1.8 rockers imo.

2MuchRiceMakesMeSick

Most of the cams, at least the ones that I like, do not recommend 1.8 rockers. I wouldnt spend the money.

ForceFed HP

what he said

cyphur

iTrader: (10)

1.8 rockers are a bad idea. you'll only end up swapping them out later if you want to do a cam. save up for a cam....do it right the first time.

IRACE2

So if you are not going to do a cam about how much do you gain?

Boostaholic

iTrader: (4)

The lift gain will be (Cam Lift / 1.7) * 1.8

Black Z/28

You'll gain a few peak. I've seen graphs that show gains anywhere from 7 to 11 hp. The effects usually don't kick in till around 4400 or so. It's an expensive mod cause you'll have to do springs as well. I did my rockers, springs, pushrods, and retainers all at the same time. I'll be looking for a mild, low lift cam for my winter project. If you're not going to do a cam and you've got plenty of money, then go for it.

98 Z

I too have heard get a bigger cam first then maybe roller rockers later. Harlan Sharps and Yella Terras seem to be the ones to go with.

TT_Vert

iTrader: (12)

u wont gain a thing at the track w/ 1.8s. im living proof..

Dave

CaptUSA

iTrader: (5)

I've never used em, but whenever you get everybody to agree on 1 point (any point), odds are that they're right. And if you look at the sig's from the people who have been responding, they know their stuff. Just my thoughts on it. Also, more people would do it if it were a cheep, proven way to make easy hp.

LS1FIRE

iTrader: (1)

I was lookin for information like this. Thanks

And thanks you everyone for your time and replys.I guess 1.8 rockers is just messing around. If i want to to get serious i guess i should get a head cam. But have no idea what tuning will be involed

cyphur

iTrader: (10)

well if you get a real mild cam, ie an ls6 cam, you may not need to tune. anything more and you'll more then likely need at least to send off for a mail order. what kind of car do you have? a4 or m6? that will also affect how bad your will run w/o a tune....the bigger the cam, the worse it will run either way. m6's are just easier to drive pre-tune.

LS1FIRE

iTrader: (1)

My car information is in my sig.If I get a cam it would proably be a pretty high medium cam. I wouldnt want to go threw all that trouble putting in a ls6 cam. Thanks for posting

CaptUSA

iTrader: (5)

Check out Thunder Racing's "OLD MAN CAM." I researched for almost a year, and drove half the site bonkers w/ all my questions. The OMC makes about the same power as a 221 cam, but does not require a tune in an A4 car. Stock idle. Stock power band. www.thunderracing.com under the valvetrain / cam section has a dyno chart using one. With headers, it's a bad ***. (for a totally stealth daily driver that is..... )

mrr23

iTrader: (3)

you will gain at the track. i'm living proof of that. .104 e.t. and .46 mph.

http://www.stealthram.com/99formulatimeslip.html #6
and dyno of the rockers and dual springs on same page. by the way VHP is having a hurricane sale on these 1.89 accelerated lift rockers that are on the wife's car. they were $669.00. now they are $619.00. PLUS you get a $20.00 mail in rebate!!! http://www.vincihighperformance.com/...LE%20PAGE.HTML

LS1FIRE

iTrader: (1)

I decided to just go with a cam thanks.

mrr23

iTrader: (3)

nope. it's called the timeslip tapes clock not set. the track i go to is getting lazy anymore. www.speedworlddragway.com will never open and run before 10:00 AM. test and tunes are wednesdays and fridays 6:00PM to 10:00PM. 10 apr 04 is a saturday. i don't race on points nights. not into it. 29 apr 04 is a thursday.

and here's the schedule for april. the 10th was points night. and there was no 29th racing. http://www.speedworlddragway.com/Schedule.html

mrr23

iTrader: (3)

i wish i had a c5. but, good guess on the time change though. the timeslips i posted were from my wife's 99 formula i drive at the track. here, i'll even post up my dyno of the cam/spring swap. in both my formulas, the 2nd and 3rd gear rpm range is 4800-6000. when shifting from 1st to 2nd, the rpms drop to 4800. same with the 2-3 shift. as you can see in the dynos. the gains were in that area. both cars have 3.23 gears. so i spend more time in that range to get the full benefit.

hp graph


tq graph. the PEAK number is misleading. there was a spike at the beginning. which is why the cursor mark is there. to show the real gain.

TT_Vert

iTrader: (12)

read the bottom of the graph. You'll notice right where the HP starts to increase on the grap w/ rockers added, the graph notes spark knock. hence the ECM reduces timing, that could account for some if not all HP too. Have you ever had your car tuned? Its possible you were running lean and the rockers richened it up some gaining HP. Have any air/fuel graphs w/ those runs?? That'd tell wonders. I find it hard to believe that I would not notice anything if you are showing 13RWHP just from rockers.

also not the temperature and barometer differences.

Dave