Thread: Max safe RPM for shifting

Trying to push your shifts to 5500 or 6000 isn't going to gain you any more hp. You are better off shifting at 4800 to 5000 and not worry about valve float on stock springs. Not to mention your tranny will thank you.

The problem here still is the 3100. No matter what your doing, if you keep it naturally aspirated...it isn't going to be fast. Or faster.

I'm sure it runs better than a stock 3100, but you might as well boost it with all the trouble your going through trying to make it go fast N/A.

Originally Posted by twich12

thanks darkhorizon and zef_66! so instead of bashing my 3100 why cant i just get an answer? ya know what, anyone on this forum that does not have a turboed ls9- your cars suck and your better off just getting a turboed/boosted ls9.... and im not going through any trouble, if you havent noticed i have yet to do any expensive modding.... custom CAI, 56mm TB off of milzy's for 20 bucks, u bend delete, flowmaster super 44 (it was cheaper than getting the OE muffler), 180* tstat, zzp performance shift kit, tuning is the most expensive thing i am doing and im using a friends tuner. everything i am doing is very inexpensive and is helping me learn more about my car, i am not a seasoned mechanic and am using this car as a learning project. perhaps later down the road i will be able to be in the super cool twin turboed ls9 club but for now im just modding on a budget and learning my way around an engine compartment

No one is really bashing you. There are quite a few members here that have started out in your position and over time they learned things by trial and error. Another thing you've got to understand is that we get a ton of people that ask the same stuff over and over so the seasoned guys here may come off as a little harsh but they are only trying to help you from spending $$$ on mistakes that could have easily been avoided.

Originally Posted by twich12

thanks darkhorizon and zef_66! so instead of bashing my 3100 why cant i just get an answer? ya know what, anyone on this forum that does not have a turboed ls9- your cars suck and your better off just getting a turboed/boosted ls9.... and im not going through any trouble, if you havent noticed i have yet to do any expensive modding.... custom CAI, 56mm TB off of milzy's for 20 bucks, u bend delete, flowmaster super 44 (it was cheaper than getting the OE muffler), 180* tstat, zzp performance shift kit, tuning is the most expensive thing i am doing and im using a friends tuner. everything i am doing is very inexpensive and is helping me learn more about my car, i am not a seasoned mechanic and am using this car as a learning project. perhaps later down the road i will be able to be in the super cool twin turboed ls9 club but for now im just modding on a budget and learning my way around an engine compartment

And if you go back and read, we did answer your question. Basically, stay at stock, or not much more than that. The reason being is you will start to get valve float and loose HP. I just don't think you want to accept that answer.

Point in case...you can't just keep revving the motor higher and higher...at some point...your going to put a strain on something that isn't meant to be ran that high in the RPM range...and it's gonna break. Then your gonna be wondering, huh...those guys were right.

Originally Posted by bluegtp91

The problem here still is the 3100. No matter what your doing, if you keep it naturally aspirated...it isn't going to be fast. Or faster.

I'm sure it runs better than a stock 3100, but you might as well boost it with all the trouble your going through trying to make it go fast N/A.

+1


Good reliable DD motor but you're not going to wring much more out of those 3.1 litres without really getting inside the engine.

Over 9000!!!!

Originally Posted by twich12

im not looking for magical horsepower, but my butt dyno tells me that the stock shift points are not taking full advantage of the power band

and good, thats what i have been driving around with and it has improved my 3rd gear noticeably (bumping my 2nd gear made my 3rd start a bit higher which minimized a large drop in acceleration)

yes im quoting myself because apparently my response to what DH said went unnoticed.... and thank you zef, i was mostly talking to blue because he seems to thread crap every 3100 thread

edit: blue does give out useful information, but its usually after he makes his crappy entrance

I would keep the stock shift points. Keep tinkering and learning while trying to to spend much cash, then move to a better platform. Like most on here do.

or if you really want turbo the damn thing lol, they made a stock turbo car in 89-91 i believe...its pretty easy to just swap most of the parts over, boom 215 horse right there, add a bigger turbo, intercool it....annd that should put ya at around 300 to the crank on full boost. well thats what ive read anyways lol, i would look up some more information on this topic

Originally Posted by twich12

yes im quoting myself because apparently my response to what DH said went unnoticed.... and thank you zef, i was mostly talking to blue because he seems to thread crap every 3100 thread

edit: blue does give out useful information, but its usually after he makes his crappy entrance

Sorry that I'm just trying to save you the trouble before you waste your time with it...but go ahead.

Next time, I won't give any advice...I'll just sit back and watch. I'm just trying to tell you since I've been there...done that...save your money...and put it into something that actually makes power...that's it.