Green3spd

iTrader: (7)

What do you recommend max RPM on stock valve train?

96lt1m6

iTrader: (31)

no more than 6000 with a spring that WAS 85lbs on the seat when NEW.....
stock cams benefit with aftermarket springs weather they are hotcam springs at 100lbs on the seat or going directly to 135s it's up to you there....excessive RPM on the stock springs is not good

robsquikz28

iTrader: (246)

x2^..............

bombebomb

Stock springs were barely enough from the factory, plus if you are wanting to turn more rpm's I am guessing a cam is in your sight, which you need new springs anyway.

shbox

Same as the stock rev limiter.

KLaBZ28

iTrader: (4)

Hmm, I always wondered this. My stock motor with 45,000 miles shifts at like 6,500rpm with the A4 at WOT. I always thought that was really high for the stock motor so I usually let off like a lame *** just before it shifts. Fail.

sdm1234

iTrader: (8)

6,500?? That's really high. I would get that checked out.

RamAir95TA

iTrader: (2)

Why would you spin higher anyway? Stock valvetrain doesn't make any power after 6,000rpm.

ss.slp.ls1

iTrader: (36)

6500 is not the stock rev limit.
Either your tach is off, or the limiter was retuned.

+1.

sdm1234

iTrader: (8)

Do you think gears would throw it off that dramatically? Maybe it's been tuned for different gears.

ss.slp.ls1

iTrader: (36)

I can't say about the gears as I have never had them, but it seems unlikely. If you have different gears and the speedo still reads correctly (how fast you are actually going), then someone altered the tune, and probably reset the rev limiter at the same time.

wrd1972

iTrader: (12)

If your motor is truly STOCK especially down to the cam and springs, if you put it on the dyno you will see HP peak at ~5.8K or so. Why it it is revving 700RPM past HP peak deserves a major "what the ****". If its stock, it is a total waste even revving above 5.9K RPM and all you are doing is killing the motor while going slower.

ss.slp.ls1

iTrader: (36)

AFAIK, you should be shifting at ~2-300 rpm's (every set up is different) past peak power. That would make shifting right at 6k optimal.

LM97Z

iTrader: (4)

I have gears, it will rev higher through the shifts, "BUT", that doesn't mean its pulling better, just means it'll "zing" up quicker then with a highway gear, i was talking with Lloyd on this subject, he told me the stock springs are borderline from the factory, but with the lazy lobes on the factory cams, it doesn't cremate them, but they are just that, "borderline", i have found on mine, that it starts platoeing @ 56-5700 on the tack, it'll go to 6-6100, but in reality, its more like 5800, he recammended (especially on a high miled engine), that changing the springs (& nothing else) will net around 10 rwhp, but changing springs/rockers (1.6s) will net a solid 20 rwhp, & then it'll pull much better above 5K with even the stock cam, the only issue there is, with a good spring that has 130+ on the seat, its best to change PRs too, the factory jobs will most likely start folding @ high RPM.

KLaBZ28

iTrader: (4)

This thread is old but I realized I never replied, my car is completely stock down to cam and 2.73's there never were any mods done to my car before I bought it and I still have only put on a CAI. All I know is i see the needle go past 6k and I think why the frig does it rev this high? I'll probably take it to the shop around here that tunes LSX and LTX. I don't wanna blow it up before I get to have any real fun

KLaBZ28

iTrader: (4)

I am the second owner and I don't think the 32yr old lady that owned it before me did any PMC tuning. lol

96capricemgr

iTrader: (1)

Tach is probably just inaccurate then.

On the original topic, springs fatigue, at this age it is very likely the valves are floating below the factory rev limit. There are gains in just new springs withough changing rockers but doing rockers at the same time is a good idea.

LM97Z

iTrader: (4)

You would be surprised how far off these fact. tachs can be, they have been known to be as much as 1000 rpms off. So don't be shocked if your tach reads 6200, but in reality the engines only @ 56-5700.

1994Z28Lt1

iTrader: (1)

from what i've seen with stock cams and valvetrain peak power is seen in the neighborhood of 5000-5200 rpm my dyno in my sig when my car was stock backs that up as well

on a factory tune that car should be shifting in the neighborhood of 56-5700 rpm

RedFire04

Sounds like someone didn't have a clue as to what they were doing and raised the rev limiter way high , probably with a hand held tuner or something of that sort, without making the proper modifications to support that kind of redline. There's no point in shifting that high anyways as you are not seeing any power up there with the stock cam. I'm suprised your motor hasn't quit on you yet!