My buddy has an LS/vtec set up in his 94 ls. Its gotta Apex'i VAFC runnin some stuff, so i dont need an ecu upgrade bumping the vtec to turn on around 5200 but i was wondering what is a safe redline. Right now he was too ghetto after getting it reringed, new bearings and the works, he didn't buy an ecu. So just as its pullin hard, you have to shift. I am buying the car here soon and i was wondering if i got the 9500 redline if its too much???
I saw an LS/vtec set up on tv last night on a streetracing "in the life" story, and i remember the guy saying "once you're off, its 9200 shift, 9200 shift....." is this correct... He got it hooked up for an outrageously low price being part of club MOSPEED, and paying a canadian price, even though we're in seattle????? any suggestions, biggest thing though is i dont wanna blow it up for a few extra rpm's? thanks, and btw what about injectors, he's runnin stock, would it be a good idea, i believe its a B16 head from a 98 civic si...... thanks!!

 

Dyno the car and see where the cams stop making power.


Also, stock valve train = stock redline for the head.

 

Stock LS rods, if new, are good to 7500 rpm.

 

ehh....dyno it to see...dude should have balanced and blueprinted it + w/o under pistons squirters....yikes...as far as the rods, they are safe to 9 or so, i'd shot-peen them and cryo them, of course, and upgrade the rod bolts, which is the REAL weak point on 'em....i mean i rev my shot and cryoed d16 rods well into 8k territory on the daily and they are lovely...balance and rod hardware are the biggest issues

 

depends on how stock it is. If it's a stock block, 6800 is the redline.

 

The motor was done right, it has the stock rods and pistons, but its got all new bearings, reringed, so its close to a new motor all together but i am wondering if i get the ecu upgrade should i be able to have it set to 9500, just dont run it up that high, maybe shift at 8500 at the highest

 

W/ Type R springs...no higher then 8500. On a stock bottom end w/ stock B series valve springs...no higher then 8200. I had a mugen chipped ecu with 8K rev limit installed when I ran my lsvtec.

 

If you want a higher redline, you're really should brace the crank. Get a Z10 or GSR crank girdle

 

i wouldn't rev past 8k rpm..the ls rod ratio is a very low 1.54 and could have a piston shoot through a wall if revved too high.

 

haha you saw "eugene" in action on mtv.

 

Really depends on what cams you're using. Remember the sole reason why the Type R springs are stiffer is not just becuase it has a higher redline, but because the grind-shape of the cams has more of a sharp angle to it, making the valves accelrate faster open than say a GS-R, this is why companies like JUN, TODA, and all the rest give much stiffer springs with their cams, even with the stock redline.

If you're running stock cams in your VTEC head, goto the stock reline of that valvetrian. If you're running ITR cams and ITR Springs and retianers, goto ~ITR redline 8500. When you start getting bigger cams (w/ matching valvetrain) you could Rev to somewhere just under 9500rpm, but if he's using stock rods, you're going to have to worry about them stretching if you're taking it up that high, shoulda got it balanced.

 

Hey thanks for all the feedback guys, like i said i am a Mitsu guy, kinda new to Acura's i appreciate your help@!!!!!
Second you know eugene, that was pretty cool, he could'a come off all badass like the dumbass w/ the crx that cant even get a CRX w/ a supercharger and a some juice to pass a ls/vtec car oh well i wont hate.......lol.....
Third, i have heard that from more than one person about the crank girtle from the GSR being better, a shop from Redmond WA recommended that...
Fourth, i will check on those springs, yes the car i just found out has ITR cams in it, and i'm not sure about springs, but that makes sense for sure....

A motor like this w/ ITR cams gets what kinda horse outta it? 215? i am just guessing cause i read that a midrange bump in lift/dur. can put you up 8-18 hp? thanks again! Just sucks cause the "OTHER" guy in redmond said w/ this motor and the gsr girdle and nothing else, you could be shifting at 9500 all day.......?

 

Anyone?

 

 

The highest i redline is 6500-6800k when pushing really hard 8k max...

Doug

 

ZEXCRX , 8000 RPM is about it for a stock LS or CRVTEC. The valve reliefs in the pistons are smaller, so watch out and don't miss a shift.

For 800-9000 RPM revving, Z-10 block girdle is a good idea, as well as aftermarket pistons with larger valve reliefs.

ITR cams are worth about 7-8 horse on the top end of a typical LSVTEC. You will wanna use the valve springs also.

Slap a VTEC head on either LS block with all stock parts and the LSVTEC will be good for around 155 whp. Raise the compression with pistons, and of course power will increase.

 

What if you have already put your money under the hood? Could you spend some on altezzas then

 

Shifting at 9.5k with type R cams is pointless.

They only make power to a little bit over 8000.

 

I just talked to my friend i'm getting the car from, and i am positive now that it has over two hundred dollars in new bolts and such, all new bearings, bolts, stock parts though are pistons(reringed) and rods, and he said that they are JUST FINE or he would have had the team shop replace them!! Stock valvesprings, w/ ITR cams. THanks though riceboy,
looks like i am gonna get the 8500RPM ecu and just shift at normal gsr limits...