Built Engine Redline

[jott5555]

ok so im in the middle of installing my newly self built engine

includes
ross 8.5:1 .020 over
eagel esp h-beams
all arp hardware
ss valves
cower retainers and springs
and that about internals

my question is would i be able to push it past 7000 rpm much? i mean im not goin for rotorie 9000 rpm but does the stock 1g ecu have a rev limiter? it would be nice to have some hp above 7000 rpm

not to sound too much like a noob..

 

[kpt4321]

This is not advanced.

You can push stock stuff to 8000, your built motor will take and love whatever you throw at it.

Stock rev limiter is 7500 rpm.

 

[diviniti]

Im going to agree with the above post.

Aslong as you are not a tool and built a nice motor (correctly)
You can push it past what the DSM Tach says.
Will you ever do this? Probably not. But it could handle it.

 

[1fast97gsx]

Id say 8000 - 8500 is safe. I rev to 8000 on stock valves and springs.

 

[Mirage2LTurbo]

Fathouse took stock valvetrain with HKS 272's to 8500, but then again, he's a crazy mofo. Built head, locally I know of a guy running 272's, crower springs/rets, stock valves going to 9500.

 

[eclpsegsx12]

My head setup consists of SI/Manley dual spings and retainers, SS Valves, and Comp Full race cams. Right now on the AEM i have it set to wrap out to 8400 but i can change that easily. Im just wondering if my 50 trim with a 63 ar with hold boost to 9k

 

[dhermann]

I would love to see what kind of power a 4g63 is making at those kind of rpms. Maybe a dyno chart with some info on the AFR at those rpms also. I think it would be kind of interesting to see what kind of setup you would have to have to keep the turbo able to flow enough air at that high or if it drops off badly. I have also wondered what kind of power indy car and F1 engines produce at their extremely high rpms-- I mean, it must be substantial or they would have no need to run that high right?

 

[98TsiAWD]

I am running 272's, crower valvetrain, and ss vavles.

I run an 8500 rev limit, but shift at 8k. I have went to about 82-8300 before with no issues.

 

[Mirage2LTurbo]

I'm running my car out till 9, but also banged off 9500 rev limiter when my t/b broke a few weeks ago, still blew 4-6% leakdown

 

[TheDeer]

I have rev'd mine to 8500, more than 10 times (not on purpose, spinning 1st). Still going strong, dyno'd the car last thurs and it made 416awp, and had no issues reving to 8K on the dyno.

 

[CallMeLTC]

Ha, don't I feel like the crazy bi***. I have a 98 GST, still a 7 bolt, with a stock longblock (stock head, stock cams, stock valves, stock springs, stock bottom end), and I shift regularly at 8300. The car has 118,000 miles on it and it still runs perfect. Just lucky so far I guess...

 

[DJpowerHaus]

What about 2.4s.. stock with 1G rods, stock with 2G rods, and built?

...with the 4G63 head of course.

 

[tmizer]

Built 7-bolt here: Eagle rods, wiseco pistons, web cams with (heavier) 2mm o/s valves on STOCK valve springs/retainers.

Rev to 8250 rpm when racing just fine

 

[Tevenor]

ok so im in the middle of installing my newly self built engine

includes
ross 8.5:1 .020 over
eagel esp h-beams
all arp hardware
ss valves
cower retainers and springs
and that about internals

my question is would i be able to push it past 7000 rpm much? i mean im not goin for rotorie 9000 rpm but does the stock 1g ecu have a rev limiter? it would be nice to have some hp above 7000 rpm

not to sound too much like a noob..

You would sound less like a noob if you used your shift key to start sentences with a capital letter.


For the most part your question has been anwsered. Stock stuff in good working order is fine to 8000 for regular visits, a little higher but don't make it a habit. Once you build it after market, 8500-9000 regular shift points aren't unheard of and some like it higher.

Thread moved.

 

[rdeterman]

Ha, don't I feel like the crazy bi***. I have a 98 GST, still a 7 bolt, with a stock longblock (stock head, stock cams, stock valves, stock springs, stock bottom end), and I shift regularly at 8300. The car has 118,000 miles on it and it still runs perfect. Just lucky so far I guess...

thats funny because the stock rev limiter is set at 7500rpms.. im callin bs on this one

 

[phatTSi]

You could shift that high but why would you want to if your not making power up there. Go to a dyno and see if you are making power up that high if your not dont shift that high and hten dont worry about it.

 

[Mike 99GSX]

thats funny because the stock rev limiter is set at 7500rpms.. im callin bs on this one

Just because he has a stock motor doesn't mean he doesn't have a raised rev limiter

 

[suicidal2af]

Even with upgraded internals, I wouldn't spin it super high unless you get it balanced and blueprinted.

A well balanced reciprocating assembly won't mind spinning fast at all.

 

[Mirage2LTurbo]

Even with upgraded internals, I wouldn't spin it super high unless you get it balanced and blueprinted.

A well balanced reciprocating assembly won't mind spinning fast at all.

I would hope you would have this done for any engine that is built.

Also to the guy above, why 2mm+ valves?

 

[tmizer]

Went +2mm because I had portwork done... not much port work as far as port work goes, and it took some intelligent machine work to get the valves to fit, but I have a great machinist who turned out to be the dad of another engineer I work with. Price was about the same even. They're SI's stainless backcut, swirl polished, yada yada valves. Russ Coxe uses them on his 10 sec auto.

There is some "conjecture" on the boards about valve shrouding with larger vavles, but it's conjecture, with no flowbench numbers to back it up. I do know, this head will get the car into the 12's, automatic, and 14b . Right now it's running rich doing a 13.3 on just 18 psi....!

 

[suicidal2af]

I would hope you would have this done for any engine that is built.

Also to the guy above, why 2mm+ valves?

Yes, one would hope that. But most of the import community doesn't even understand what those words mean, and think that tossing forged internals in your motor means you can rev it to a billion and a half rpm. I tossed it out there just in case

 

[JohnTSI]

Jason's 35r powered car went 8500 for over a year and a half on stock heads here. My car is runnng 9500 on built motor springs retainers and cams, with no problems.