Dragaholic

iTrader: (180)

Im running a 224/224 .581/.581 112 installed with no advance/retard and from my graph back in April of '03, it peaked around 6300 and carried it all the way to 6600 where it then dropped off only because the rev limiter was set at 6600 at the time. Its not set at 6700 because I have my shiftpoints set at 6500 and gave it a little room for overshift. However, sometimes my tranny (200-4R) shifts a little higher and hits the limiter, so I was wanting to move up the limiter to 7000 so that it has plenty of room to shift at 6500 to 6700. Actually, I need to find my ideal shift point. Like I said, I have it set at 6500 right now. How can I figure out where mine needs to be? Anyhow, Im only running a cam, stock heads, and stock bottom end. Will I be ok to put the limiter at 7000 so that I can up my shifts if needed? Thanks.

99 Black Bird T/A

iTrader: (4)

I would not spin a stock bottom end to 7,000 rpm and expect it to live very long. Sure some do live for a while but some don't. If the car is a 98-00 the bolts are weaker than on 01+ engines. If you can afford to replace the engine if it lets go and that's not an issue go for it IMO.

ONEBADWS6

iTrader: (22)

It's your call but with the same cam and a stock bottom end I sprayed a 200shot to 7200rpm and never hurt a thing. But you may not be so lucky.

santino04

I have mine set at 6800, the torque starts tailin off at about 5000 rpms then the horsepower at about 6000 to 6200 rpms but very very slightly almost not even at all. There isnt really a point to carry the rpms any higher if everything is tailing off, I think its always good to give yourself some cushion for the tranny to shift, you dont want something dumb to happen........for example say your tranny is low on fluid in an automatic or its slippin, it wouldnt enagage soon enough and bam your hittin the rev limiter if you dont have that cushion.....in a manual you better not miss that 2-3 booooom!

DenzSS

Spin the engine only as high as you absolutely need to. 7K will kill the engine. Some last longer than others, but all (stock) will eventually destroy themselves.

Dragaholic

iTrader: (180)

Sorry I didnt specify, I didnt mean is it ok to shift it at 7000, I just wanted to put the limiter at that because I wanted to up my shifts to say 6600 or 6700 rpms and leave a little room for overshift. My intentions are not to spin the motor that high, just to give a little room for overshift so that I dont hit the limiter and lose time since its only at 6700 right now. By the way, how can I figure where my shiftpoints need to be? Thanks.

93LS1RX7

iTrader: (8)

Didnt Colonel explain all this to you in your other thread? Now I see what he was talking about. Same questions over and over again.

Z-Rated

Yes he does this a lot
Bro dont spin your motor that high, I dont want to hear all the threads you would make and all the questions you will ask when that motor lets go...

MyLS1Hauls

iTrader: (2)

There is no reason to rev a stock headed motor that high with a cam that small. I honestly find it hard to believe that your cam carries peak hp to 6600+. If it honestly does, then you need to advance it to a 108ICL to bring it down some. 7000 rpm is just unnecessary wear and tear.

Hardtop

iTrader: (3)

I had that exact same cam. The power peak was about the same rpm as yours. No reason to spin it to 7000 because its not making any power at that rpm anyway. Mine dropped like a rock after 6600. I'd set your limiter at 6700, and shift between 6400-6500.

Bruce

Dragaholic

iTrader: (180)

MyLS1Hauls: What do you mean by advancing it to a 108ICL? Bring what down? I honestly dont want to spin the motor this high either, but my question didnt say that I will be shifting at 7000, it simply says if Im ok to put the rev limiter there, so that I can shift the car at 6500-6600 rpms. Im looking at my graph now, it peaks at 6300 and carries it to 6600 where it drops off only because thats where the limiter was set at the time. I installed my cam with no advance or retard built into the cam and installed it straight up. Id like to strap it back on the dyno, bump up the limiter and see wher the hp really starts to fall. The whole reason for me making this thread is to ask if it was ok to put the limiter at 7000 so I can give my tranny some room for overshift. What do you think I should do about my cam? Thanks.

Hardtop: My rev limiter is set at 6700 rpm now and Im shifting at 6400-6500, but the rev limiter doesnt have enough space after the shiftpoints. It hits it every so often causing me to lose time.

Z-rated: When are you going to let me hear your car and check out the new exhaust? Im doing duals as well and I wanna get an idea. Plus I see that you have new rims as well. Ive always liked your car, clean simple, yet different. Anyhow, let me know.

93LS1RX7: No...Colonel didnt explain to me if I would be ok to raise the limiter to 7000 so that I have more room for overshifts.

MyLS1Hauls

iTrader: (2)

If you have a cam that has a 112LSA and install it at 108LSA, that means 4* advance...which will improve low end response and shift the peak power rpm down a couple hundred. Thats why I'm running my 228/228 112 XER 4* advanced...cause I don't want to spin my '00 motor past 6600rpm, which is where my rev limiter is set.

If you are hitting your 6700 rpm rev limiter occasionally, you need to lower your shift points some IMO and add 4* advance with a timing chain set to make the bottom end live. The way I see the rev limiter is its the maximum safe rpm to rev the motor to. 7000 IS NOT safe on a 97-2000 motor and barely safe IMO on an 01+

slyws6

I have my rev limiter set to 7200 and have had no problems ....yet.... and I hope not to either but you gotta be ready for it if it decides to let go. On the other hand my power doesn't peak until 7000-7100 so I'm still making power. Just be ready if it does let go.

-Sly

Dragaholic

iTrader: (180)

Besides improving low end response and lowering the power peak, what other kind of advatanges and disadvantages come with doing so? What would happen if I retarded the cam? If you think about it and Im not saying youre wrong, but think of the word advance, you think more, above, higher, etc., so wouldnt advancing 112, make it go higher? 4º advance on a 112 is 116??? Im sure thats wrong, but just thought that Id clarify. Anyhow, how much would you say I should advance it? By the way, will this affect my times at all? Thanks.

gator's 99TA

iTrader: (2)

i think you should shift the car at 7500 rpms with your 4800 rpm convertor and 4.56 gears.......

and yes, i was being sarcastic and yes you ask the same damn questions over and over again.

MyLS1Hauls

iTrader: (2)

What I stated is 100% correct. Advancing means that valves open sooner and close sooner...doesnt matter how you take the choice of words...When you advance a 112LSA cam 4*, it now has a 108 Intake CenterLine, when installed correctly. If you retard the cam, you will push your peak hp rpm up even more than what you've already got. What will it do to your times???...hard to say...my guess is you wont notice the difference.

The Juggernaut

iTrader: (7)

I would set the limiter @ 7050 and shift @ 6700-6900.
But hey, that's just me.

The Juggernaut

iTrader: (7)

....then again, I've LAUNCHED the car @ 7k.

Colonel

LOL! Yep, that's probably what I'd do. I'd find the RPM that would give me roughly the same HP at the shift as after the shift (gotta know what your shift extension is.) If it blows, well, that means I screwed up in selecting my cam and converter. Time for a forged rebuild!

What you were told about advancing the cam is dead on accurate. You can influence the power range by doing this. I wouldn't go over 4 degrees though. Probably not worth the trouble to be honest. It might help a little bit and it might not. Too hard to say. This is getting down to pretty fine tuning. You have more important issues to work out before you get this technical. If you had everything else dialed in perfectly and were stuck at a 11.05 then I might say go for it.

Dragaholic

iTrader: (180)

Well do you think if I was to advance the cam, it would get me to my power faster resulting in better times? Right now its peaking at 6300 and Im passing the traps at 5700, so I havent even begun to get back in my power range. I figured if I can peak sooner, I can get in my power band sooner, leading to better times. Thats just a logical guess, I wouldnt know for sure. The cam has no retard or advance built into it and I installed it straight up. I guess that is why it was hard for you to believe that my cam peaked at such a high rpm. Why wouldnt you do it more than 4º? Also if I was to advance the cam, I wouldnt have to worry about spinning the motor as high. Anyhow, I dont mind doing this if you think its worth it. Im on a mission to get this car going maximizing on my setup. Thanks.