00blacka4

iTrader: (7)

Can i replace my valvesprings and still be able to be "SI" and be on the list....as long as they are OEM replacements? also what kinda gains could this give me and what would i likley see on the dyno ? 5hp ? ehhh ?

zracer323

iTrader: (12)

I dont see why you couldnt. I would consider them a maintanence item. Hp gains will depend on the condition of the current springs. If they are still in good condition then you wont gain anything.

Zmg00camaross

iTrader: (11)

I agree should not be a issue, Stock part is a stock part. No LS6 springs I would imagine.

JL ws-6

iTrader: (50)

If you replace them with a stock replacement spring I see nothing wrong with doing that.

:cough: I would shim them alot closer to coil bind to help stop float :cough:

Disclaimer: I am not the one that made those rules up so the shims, may or may not be o.k.

tee-boy

iTrader: (8)

I would think getting the valves to shut faster in upper rpm would add a couple of hp on an SI motor.

studderin

iTrader: (28)

new stocks. dont do that LS6 BS

BAIN

iTrader: (5)

I'm pretty sure the list was setup for stock original motors that have not been opened up. Only allowable modifications were external bolt-on's.

00blacka4

iTrader: (7)

some of those records were set in 04 and 05 and these cars are getting old i mean **** my cars almost 12 years old...as long as its stock OEM replacement springs it should be okay correct?

Jay-P

iTrader: (16)

Yes, don't worry about it, like you said alot of the records were made years ago, with fresh motors, there is no reason why we cant replace worn parts...

studderin

iTrader: (28)

ya I was gona say the same thing. Not only mileage, heat cycles and rpm doing wear. But remember how many years its been, the springs have been compressed at installed height. There always what? 4-6 springs off the seat too, some springs could be 14-15 years old now. I think GM just stopped making LS1 blocks too, I read over on YB. And I know how hard it is to find a stock LS1 even 80-130K miles ones, you can build one for what a used one would cost.. if you can find one.

Nitroused383

iTrader: (10)

I'm pretty sure all the cam only, stock bottom end, stock internal and whatever other titles out there are all made up internet classes. I've yet to see any of these races at a track where a car is teched or inspected for such rules. Your word against someone eleses and no way to validate anyones claims anyways.

nmass399

I would honestly say no from my point of view just for the fact that i could do the same thing and get my upper rpm back but thats just me lol. Who's to say you could not put new oem rings or other things in there.

But really its stock parts right, so your not getting an advantage over someone else. What would be the difference if you bought a brand new crate ls1, put it in there with the same specs doing the same boltons vs putting brand new oem springs on it or even having a 0 mile ls1 car for boltons lol.

As long as you don't do anything diff from what oem is, it should be ok. But more or less i think it should be up to everyone on the list.

Zmg00camaross

iTrader: (11)

Would be badass a cam only class heads up Be super competive. And give me a damn good goal and sweet class to run.

00blacka4

iTrader: (7)

you really think throwin new OEM springs on our cars would bring back the upper part of the graph ? or make more power upstairs....my graph kinda flatlines/gradually goes down after 5300 it just poops out

nmass399

It might not, mine seems to fall off very hard after 5500 to 5700 rpm's but according to the dyno graph i got of it in 08 i should be shifting higher, mine peaks at 5400 and carries well to the rev limiter when it was at 6200. Back then the car only had a lid and slp ram air box and filter and thats all.

I don't know, it would be nice to see if mine was havin issues at 5500 plus or if its just a tuning issue.

Mine gradually goes down afterwards to but its still makin more power upstairs compared to if i shift at 5700 and it drops to 4600 (shift from 2 to 3rd) vs if i shift at 6200 and it would drop to say 4900-5200 or somethin in that range (2nd to 3rd). Its makin more overall power is what i am trying to say lol. But when i shift that high, then there was really no change in anything on my time slip.

If i had a set of springs it would be neat to try it out. I just looked at such and such site to see how much springs cost and it shows $2.22 a spring, not sure if they are the right one's tho. I am gonna do some research on this.

Nitroused383

iTrader: (10)

Shim your springs and get an adjustable timing set. Retard the the stock cam that should help.

The lower power numbers are from my car when it had ls1 intake, ebay headers and a slp lid. I had around 110,00 miles on it at the time. As you can see the stock cam peaks around 5600 rpm and falls after that.

studderin

iTrader: (28)

stock cam is gona peak at or before 5500, your not going to gain rpms from springs just maintain rpms till over 6K with valve control. Were you could be down 10-30whp if it is falling off bad, plus alot safer. I'll see if I have any grafs of that SI?

I know mike (newera) knows this stuff really well after tuning for all these years. A few times after pulling a car in and after the 1st pull after knowing nothing of the car then the visual mods, what the owner said it was a stock cam. He would say it had a small cam. And sure enough it was a z06 cam or even some super small GM cam, or something form the 90's. Not talking 224R. Just something stupid mild 20x 20x that would peak at 5700 or something.

you can't shim or move the cam around SI why do you bring that up?



my car, SLP lid, free ram air, ported TB stock tune, and tune. 60K miles stock plugs and wires, cats. I'll find my buddies 02 SS that was more most PH SI car. It had good mods, I think it made 375whp? there was a thread on it. A few other shops had a car do it too.

nmass399

I was just talking about where it started to fall off hard at on my engine, mine makes peak at 5500 on my graph (just looked lol) then slowly declines, but when making a run it feels like it falls off hard after 5700 like its valve float or in my tuning.

It also makes just as much power at 6200 rpm's as it does at 5000 rpms which is 330hp on the graph, peak it made 346hp, torque peak is 351 at 4400 rpm's. I was just stating it should be better for me to shift up higher than at 5700 rpm's(only from 2to3 and 3to4 for me tho) just for the fact at 4500 rpm's its only making 300hp.

11SECSS

iTrader: (199)

So what about some people with the 97-98 motors can they change heads to say some stock 853 or 241 and still be considered SI.

00blacka4

iTrader: (7)

no you cant change heads, origional heads...but all im saying is what if someone breaks a valvespring or bends a pushrod, they deffinetly should be able to replace parts like this to prevent this from happening and just to be safe, its just like changing your oil...oil is on the inside of the motor and its a maitence thing just like valvesprings and other things...


my car peaks at like 5300 and falls gradually from there...im just wondering honestly how much i could pick up changing my springs out...any way it could hurt power?