MY 2003 SUNFIRE 15.33@88.5mph
"A N/A ecotec is not gonna give Honda's and Mitsu's that much of a run for their
money unless their blown or bottle fed.GM is still smokin crack!"
~1QWKZ24
www.streetracing.org, 08/2001
Yup, dont take it past that tho.
I've spun 8200 with my car, its some scary @!#$.
7000 is the fuel shut off..i was seeing exactly how far i cuold go so i let it bounce of rev limiter once. wiht the 2.1.12 version now getting pretty damn close to 7000 in 2nd gear also..b4 i was only getting to about 6800
MY 2003 SUNFIRE 15.33@88.5mph
"A N/A ecotec is not gonna give Honda's and Mitsu's that much of a run for their
money unless their blown or bottle fed.GM is still smokin crack!"
~1QWKZ24
www.streetracing.org, 08/2001
yea i know of at least 5-6 that have run to 7000 on a stock valvetrain on an eco, i have 92,000 on mine so i should prob not do that anymore but its so much fun
1989 Turbo Trans Am #82, 2007 Cobalt SS G85
You probably know already, but, these engines stop making horsepower before 6K rpms.
teh Sunfires... (Tom) wrote:You probably know already, but, these engines stop making horsepower before 6K rpms.
bc timing is getting pulled at top end. i'm getting absolutely ZERO Knock Retard. from 0 rpms all the way till 7000 rpms. which means i shouldnt be having timing pulled anymore. its time to keep advancing the spark timing to see if i can get anymore power out of my little turd.
MY 2003 SUNFIRE 15.33@88.5mph
"A N/A ecotec is not gonna give Honda's and Mitsu's that much of a run for their
money unless their blown or bottle fed.GM is still smokin crack!"
~1QWKZ24
www.streetracing.org, 08/2001
If the STOCK valvetrain goes to 7000 and my Patriot one is stronger...I might have to do some testing on this :-) I WANT MY HP TUNERS!
I used to race cars, now I race myself.
5K PB: 24:50
10K PB: 54:26
I'm thinking its tuned that way for reliability, i'd be carefull runing the motor up that high if you've got a stock valvetrain.
Eh, that's only 500 more RPM's than stock. no biggie. must be nice tho. Now what you need to do is build it for 8 or 9k with a head to match. THEN you'll make some real power. what do RSX's rev to? like 8500 right?
I wish I had hp tuners!! But I'm spending money on DR's, an LSD, and Control arms bushings. maybe after all that I could save up for it.
Good luck!!! and Happy 4th
2004 Cavalier
13.2@105........
Mods...
BFG Drag Radials
Saab Turbo kit
2.5 exhaust, w/cutout
Spec Stage 2+ Clutch
my car definetly pulls after removing spark ramp out and screwing with timing a little bit... more revs with stock valvetrain / stock cams does help
expect track times on friday.. maybe some video
7000RPM <3
well the reason the car dont make power top end is cause of the way the pcm is set up
1989 Turbo Trans Am #82, 2007 Cobalt SS G85
so if I understand , tuning the computer can let the car run great a 7000 rpm's???? the hp curve will follow throug the 7000 rpm??? is the internal's able to hold that much revolution???
http://cavalierdomination.monchar.com
DaFlyinSkwirl (PJ) wrote:my car definetly pulls after removing spark ramp out and screwing with timing a little bit... more revs with stock valvetrain / stock cams does help
expect track times on friday.. maybe some video
7000RPM <3
i'm holding u to that...if it dont rain, been raining like crazy lately. lets go i'm expecting atleast a 14.7 from ya....meanwhile i'm trying to break 14s myself....if i had the gas i'd be doing some logging but prolly wednesday. right now only running 2* advanced spark over stock (with 0 KR)..i have a setup right now with 4* over stock just gotta wait b4 i can take it out for a spin and log some more....prolly will head up to atco on a sunday morning for the test and tune once i save up some money for gas and entry fee.
MY 2003 SUNFIRE 15.33@88.5mph
"A N/A ecotec is not gonna give Honda's and Mitsu's that much of a run for their
money unless their blown or bottle fed.GM is still smokin crack!"
~1QWKZ24
www.streetracing.org, 08/2001
when i bust a valve ill be sure to post lol
1989 Turbo Trans Am #82, 2007 Cobalt SS G85
Does anyone know what RPM your stock cams (eco) make power up to? Where does the power fall off, and how quickly? Does making timing and fueling changes compensate for a cam grind not designed to make power that high in the rev range?
I've got 2.3 LO cams in my 2.4, and those engines revved higher than my 2.4 stock, but I'm still worried about taking it much higher than stock due to my weak oil system. I'm hoping synthetic will give me some safety buffer there though, lol.
15.3 @ 89.97mph, 14's on the way?
Quote:
Ian Brydon
Today 9:54 AM
Does anyone know what RPM your stock cams (eco) make power up to? Where does the power fall off, and how quickly? Does making timing and fueling changes compensate for a cam grind not designed to make power that high in the rev range?
to an extent. i find myself usually shifting around 6900rpm or so if i go by feel (car tapers off slightly around there)
however, i haven't messed with fuel yet. I'm positive if I richen it up i'll get more power and finally be able to fight off KR
I don't know about the Eco parts, but in my experience, the stock SBC internals can handle 6800-7200 rpm for quite a while. The older SBC parts (cast rods and pistons) wern't built with the quality that the Eco's are(powdered metal rods and hyperutectic pistons, plus less mass). The oval track motors will sustain the rpms for a longer period than a drag motor and will do it a couple of times a lap and the feature races run 25, 50 or 100 laps. Not saying that the won't break, but I would give them a little more in the durability department.
JimmyZ wrote:I think everyone is missing a more important component of a rev limiter. The valvetrain is important, but only in the sense that higher RPMs can cause valve float when running stock valve springs and guides. The valvetrain becomes more critical in an OHV motor, where you have to worry about rocker and pushrod slippage when valve float occurs, but that's not an issue on an overhad cam engine like an Ecotec.
The more important thing to consider is piston velocity and the stresses that are placed on the rod and main bearings from running at speeds that are higher than their build rating. I'd worry about the reciprocating internals long before I'd worry about the valvetrain in an overhead cam engine. It's most likely not going to grenade it on the first run, or maybe not even the second or the third but it will happen eventually. That much you can count on.
I've been doing it now since Matt and I turned mine up almost a good 2 months now and I drive mine hard everytime... no problems yet...
(knocks on wood)
LE61T PTE6262 Powered 
Well I can't seem to get my rev limiter or speed limiter to go away, and I'm using HPT .12, and adjusting the speed limiter, spark ramp outs (RPM to max value, and speed maxed out as well), and fuel cut, stull there for both speed limiter, and rev limiter. Does anyone know all the parameters that must be altered to remove these limiters?
15.3 @ 89.97mph, 14's on the way?
alls i did was go to fuel cut off set it to 7000 and it took care of it all.
MY 2003 SUNFIRE 15.33@88.5mph
"A N/A ecotec is not gonna give Honda's and Mitsu's that much of a run for their
money unless their blown or bottle fed.GM is still smokin crack!"
~1QWKZ24
www.streetracing.org, 08/2001
i know for sure that my speed limiter is gone.....lol
1989 Turbo Trans Am #82, 2007 Cobalt SS G85
See you guys can go rev it safely to 7000 I would, but what Jimmy is trying to bring a point is, factory pistons and rods, are quiet off in weight causing the whole engine off balance(well the bottom end).
It is already a crappy balance job from factory with crank and pistons/rods, at 6000 rpm, try spinning it at 7000 or 7500 given that your valve train will hold, you exponentialy increase stress and fatigue on the bottom end.
My pistons and rods are in .1 of a gram within the weight range of eachother what are you'alls??
Valve train will be OK at 7000, I think noone will have any problems any time soon even tho you guys should look into upgrading soon.
Our valve springs are only 50 lbs and 140 lbs over the nose, it would do wonders and maybe gain you a few HP to upgrade to like a single drop in such as 90 lbs and 200 lbs over the nose.
Just from singles!!
Fro you others who wanna run anything over 7500 rpms, I would be more concerned with your Hydraulic Lash Adjusters than anything, they will break, and if you do wanna run those you have to switch to solid ones and grind to adjust the lash yourself.
LSJ's last here locally at 7000 rpm's, I still haven't heard one to fail.
They only last about 3 days at 8200-8500 RPM's, so whoever said that ""THEY CAN REV THAT HIGH!! ""
You got some balls or you are misinformed bro.
All this speaking from the experience of course.
P.S Also, there is a big issue with crank vibs. aka Harmonics, associated with revving high, I don't think stock Dampner is capable of revving at 8500 all day long safely, it is just that the valve train fails before the bottom becomes an issue.
My 2 cents, take it for what is worth, there is plenty of B series running 10K+ and K series around here, there is a right way and a wrong way.
Best time:"""11.946""" @ 114.73 mph @17psi 1.83--60"
11 second daily driver!!!!
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13's
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damn i need to get me some hp tuners
