raising rev limit?

maineah · Jan 31, 2013

Rich91710 said: ↑

Piston speed is zero at TDC and BDC
Might be 40mps mid-stroke.
Click to expand...

That is correct just before TDC, BDC piston speed is at it's greatest TDC,BDC piston speed zero.

maineah · Jan 31, 2013

chris4x4 said: ↑

To get 40 MPS, the crank would be spinning about 30,000 RPM....
Click to expand...

You have to take into account it has to stop at TDC and BDC and accelerate back up to speed.

dually · Jan 31, 2013

Blackdawg said: ↑

1jz with 272 cams...can get 10k no prob
Click to expand...

Yes, with an EMS. Im talkin bone stock

chris4x4 · Jan 31, 2013

maineah said: ↑

You have to take into account it has to stop at TDC and BDC and accelerate back up to speed.
Click to expand...

That has nothing to do with the speed. That has to do more with the mass of the components, like Piston, con rods, crank, etc.

chris4x4 · Jan 31, 2013

Many folks seem to think that simply increasing RPM's gives more performance, but fail to take into account some things, for example, Internal inertia stress on the bottom end components increases with the square of piston speed. As mentioned, pistons, and components have to accelerate, then slow down. This creates ALOT of internal forces. Now, this can be addressed with higher quality/strength materials. However, most production vehicles, unless high performance, dont have these. Second, Sonic velocity places a limit on aspiration efficiency at high mean piston speeds - the airflow just can't keep up with piston motion, no matter how short and efficient the inlet tract is. Air has mass. Just because a piston is going up and down faster than shit, doesnt mean it can effectively fill the cumbustion chamber each time it goes down. Thats why you see HP/Tq. dropping near the top of an engines max RPM's. The engine is loosing efficiency, and not able to fill teh CC's as efficient. Other things to take into consideration are Valves, and springs. They have mass as well, and springs can only rebound so fast, forcing teh valve closed. Too high of RPM's, that exceed the ability of the springs to close the valves, can cause the valves to "skip" over the cam lobes. So.......in short, its not as easy as flipping a switch in the ECU, and getting more RPM's. The Tacoma engines, as seen in many dyno sheets/ptintouts, looses efficiency after 500 RPM's or so.

Pugga · Jan 31, 2013

chris4x4 said: ↑

Many folks seem to think that simply increasing RPM's gives more performance, but fail to take into account some things, for example, Internal inertia stress on the bottom end components increases with the square of piston speed. As mentioned, pistons, and components have to accelerate, then slow down. This creates ALOT of internal forces. Now, this can be addressed with higher quality/strength materials. However, most production vehicles, unless high performance, dont have these. Second, Sonic velocity places a limit on aspiration efficiency at high mean piston speeds - the airflow just can't keep up with piston motion, no matter how short and efficient the inlet tract is. Air has mass. Just because a piston is going up and down faster than shit, doesnt mean it can effectively fill the cumbustion chamber each time it goes down. Thats why you see HP/Tq. dropping near the top of an engines max RPM's. The engine is loosing efficiency, and not able to fill teh CC's as efficient. Other things to take into consideration are Valves, and springs. They have mass as well, and springs can only rebound so fast, forcing teh valve closed. Too high of RPM's, that exceed the ability of the springs to close the valves, can cause the valves to "skip" over the cam lobes. So.......in short, its not as easy as flipping a switch in the ECU, and getting more RPM's. The Tacoma engines, as seen in many dyno sheets/ptintouts, looses efficiency after 500 RPM's or so.
Click to expand...

Clearly, you've never see the Fast and the Furious and obviously don't know about:

It like, instantly adds 1,000 RPMs, doubles your HP and makes your balls swell at the push of a button.

chris4x4 · Jan 31, 2013

Pugga said: ↑

Clearly, you've never see the Fast and the Furious and obviously don't know about:

It like, instantly adds 1,000 RPMs, doubles your HP and makes your balls swell at the push of a button.

Click to expand...

Ive used nitrous in the past with good results. As for the Fast and Fuirious thing.....well...given teh Hp they claimed their cars made, it sure seemed to take a long time to hit, say, 100 mph in them. Hell.....The "good guy" was accelerating for 3 mins at the beginning of the film. A Dodge Neon can hit top speed in that time.....

40950 · Jan 31, 2013

1980's stock RX7's were in the 11,000ish red'lines if I remember correct,,but just some funky knuckles swinging in there. Rode in one that could spin up to 19,500. Very erie wail coming from that engine. MY 406 SBC is chipped at 6600 because that's where the TORQUE just starts to tip off. I have overrided to 6800, but that's my limit and the dyno reading fall off dramatically at about 67-68. I have a 150hp plate system on that and it makes it a fun ride, feels like shifting a extra gear when it fires off. (wink wink).

NO need to chip your Toyota until you build up all around it to handle the extra. The engineers spent quite a bit of dyno time to get a livable motor for the masses., Now you probably weren't thinking of chipping it waaay above the set limit, but just chipping it a touch higher takes it out of the engine sweet spot and the numbers will fall off,,so you really don't gain much but extra engine wear.

kickergt · Jan 31, 2013

Wow clearly some of you are fucking retarded and some of you arent. not gona point fingers but who cares. There is more power to be had with more rpm with the motor. Mine is turboed at the moment and making 351 whp. Id like to make more. I could care less if it brakes. I have more motors. It was a simple question.

Normally it would make peek power around 4500 na or with a junk ass supercharger but turbos react a little different when they are given the fuel they need. I make peek power at 3900 and carry it to 5000 where i currently start running lean. I have a set of injectors coming that will be able to support much more power and i was wanting to get the rev limit to 6k. If anyone knows of a programer that does that and can tell me who it is that would be great. Till then keep your retarded honda comments to yourself because my 4x4 yota would be happy to push that shit in.

DriverSound · Jan 31, 2013

kickergt[OP] said: ↑

Wow clearly some of you are fucking retarded and some of you arent. not gona point fingers but who cares. There is more power to be had with more rpm with the motor. Mine is turboed at the moment and making 351 whp. Id like to make more. I could care less if it brakes. I have more motors. It was a simple question.

Normally it would make peek power around 4500 na or with a junk ass supercharger but turbos react a little different when they are given the fuel they need. I make peek power at 3900 and carry it to 5000 where i currently start running lean. I have a set of injectors coming that will be able to support much more power and i was wanting to get the rev limit to 6k. If anyone knows of a programer that does that and can tell me who it is that would be great. Till then keep your retarded honda comments to yourself because my 4x4 yota would be happy to push that shit in.
Click to expand...

Might be worth your time to read.

http://www.tacomaworld.com/forum/performance-tuning/106205-5vz-fe-potential.html

StAndrew · Jan 31, 2013

kickergt[OP] said: ↑

Wow clearly some of you are fucking retarded and some of you arent. not gona point fingers but who cares. There is more power to be had with more rpm with the motor. Mine is turboed at the moment and making 351 whp. Id like to make more. I could care less if it brakes. I have more motors. It was a simple question.

Normally it would make peek power around 4500 na or with a junk ass supercharger but turbos react a little different when they are given the fuel they need. I make peek power at 3900 and carry it to 5000 where i currently start running lean. I have a set of injectors coming that will be able to support much more power and i was wanting to get the rev limit to 6k. If anyone knows of a programer that does that and can tell me who it is that would be great. Till then keep your retarded honda comments to yourself because my 4x4 yota would be happy to push that shit in.
Click to expand...

With that post, might as well delete your account and try another forum. Not gonna get any help here with a shitty attitude.

Rich91710 · Jan 31, 2013

maineah said: ↑

That is correct just before TDC, BDC piston speed is at it's greatest TDC,BDC piston speed zero.
Click to expand...

Bzzzt....

The engine is reciprocating. Piston speed is at it's greatest with the piston 90 degrees before and after TDC/BDC.

Simple physics... it can't be any other way in this universe.

Rich91710 · Jan 31, 2013

Pugga said: ↑

Clearly, you've never see the Fast and the Furious and obviously don't know about:

It like, instantly adds 1,000 RPMs, doubles your HP and makes your balls swell at the push of a button.
Click to expand...

No... THIS will make your balls swell...

Pugga · Jan 31, 2013

chris4x4 said: ↑

Ive used nitrous in the past with good results. As for the Fast and Fuirious thing.....well...given teh Hp they claimed their cars made, it sure seemed to take a long time to hit, say, 100 mph in them. Hell.....The "good guy" was accelerating for 3 mins at the beginning of the film. A Dodge Neon can hit top speed in that time.....
Click to expand...

I blame that movie for Honda Civics with fart can exhausts everywhere... I actually saw a Civic with an FMF can stuffed on there.

chris4x4 · Jan 31, 2013

Pugga said: ↑

I blame that movie for Honda Civics with fart can exhausts everywhere... I actually saw a Civic with an FMF can stuffed on there.
Click to expand...

LOL!! I had my ass handed to my at the track ( I was in my first gen'er with SC) by a Honda Civic! Thing ran an 11.2 or some stupid shit. On the other hand, I saw a Saturn last week with a big ol fart can on it, and im pretty sure that thing coulndt hit 70 with me pushing it.

WhatThePho? · Jan 31, 2013

My fix to a slow truck was I replaced it with a turbo'd car...

WhatThePho? · Jan 31, 2013

If you want to push the rpm. Look for the urd speed unlimiter. They no longer make them, once in a while you'll find them for sale tho.

40950 · Feb 1, 2013

Here. Enter your info and order one up.

http://www.magnumtuning.com/en/detail/revolution-pro-speed-rev-limiter-cdi-box/auto_urit

chris4x4 · Feb 1, 2013

Mod said: ↑

Here. Enter your info and order one up.

http://www.magnumtuning.com/en/detail/revolution-pro-speed-rev-limiter-cdi-box/auto_urit
Click to expand...

Those only work on vehicles with a distributer.

Gearheadesw · Feb 1, 2013

kickergt[OP] said: ↑

Wow clearly some of you are fucking retarded and some of you arent. not gona point fingers but who cares. There is more power to be had with more rpm with the motor. Mine is turboed at the moment and making 351 whp. Id like to make more. I could care less if it brakes. I have more motors. It was a simple question.

Normally it would make peek power around 4500 na or with a junk ass supercharger but turbos react a little different when they are given the fuel they need. I make peek power at 3900 and carry it to 5000 where i currently start running lean. I have a set of injectors coming that will be able to support much more power and i was wanting to get the rev limit to 6k. If anyone knows of a programer that does that and can tell me who it is that would be great. Till then keep your retarded honda comments to yourself because my 4x4 yota would be happy to push that shit in.
Click to expand...

You could have said that from the start. Turbo'ed is a lot different. Don't give all the info, then get pissed at replys? Just go buy more engines, motors are electric.

Log in or Sign up

Welcome to Tacoma World!

raising rev limit?

#41
maineah Well-Known Member

#42
maineah Well-Known Member

#43
dually Low and slow

#44
chris4x4 With sufficient thrust, pigs fly just fine. Moderator

#45
chris4x4 With sufficient thrust, pigs fly just fine. Moderator

#46
Pugga Pasti-Dip Free 1983 - 2015... It was a good run

#47
chris4x4 With sufficient thrust, pigs fly just fine. Moderator

#48
40950 Well-Known Member

#49
kickergt [OP] Well-Known Member

#50
DriverSound Señor Member

#51
StAndrew Wait for it...

#52
Rich91710 Well-Known Member

#53
Rich91710 Well-Known Member

#54
Pugga Pasti-Dip Free 1983 - 2015... It was a good run

#55
chris4x4 With sufficient thrust, pigs fly just fine. Moderator

#56
WhatThePho? Greg Graffin 2016

#57
WhatThePho? Greg Graffin 2016

#58
40950 Well-Known Member

#59
chris4x4 With sufficient thrust, pigs fly just fine. Moderator

#60
Gearheadesw must modify

Products Discussed in

Log in or Sign up

Useful Searches

Welcome to Tacoma World!

raising rev limit?

#41 maineah Well-Known Member

#42 maineah Well-Known Member

#43 dually Low and slow

#44 chris4x4 With sufficient thrust, pigs fly just fine. Moderator

#45 chris4x4 With sufficient thrust, pigs fly just fine. Moderator

#46 Pugga Pasti-Dip Free 1983 - 2015... It was a good run

#47 chris4x4 With sufficient thrust, pigs fly just fine. Moderator

#48 40950 Well-Known Member

#49 kickergt [OP] Well-Known Member

#50 DriverSound Señor Member

#51 StAndrew Wait for it...

#52 Rich91710 Well-Known Member

#53 Rich91710 Well-Known Member

#54 Pugga Pasti-Dip Free 1983 - 2015... It was a good run

#55 chris4x4 With sufficient thrust, pigs fly just fine. Moderator

#56 WhatThePho? Greg Graffin 2016

#57 WhatThePho? Greg Graffin 2016

#58 40950 Well-Known Member

#59 chris4x4 With sufficient thrust, pigs fly just fine. Moderator

#60 Gearheadesw must modify

Products Discussed in Entire Site Forum: 1st Gen. Tacomas (1995-2004)

#41
maineah Well-Known Member

#42
maineah Well-Known Member

#43
dually Low and slow

#44
chris4x4 With sufficient thrust, pigs fly just fine. Moderator

#45
chris4x4 With sufficient thrust, pigs fly just fine. Moderator

#46
Pugga Pasti-Dip Free 1983 - 2015... It was a good run

#47
chris4x4 With sufficient thrust, pigs fly just fine. Moderator

#48
40950 Well-Known Member

#49
kickergt [OP] Well-Known Member

#50
DriverSound Señor Member

#51
StAndrew Wait for it...

#52
Rich91710 Well-Known Member

#53
Rich91710 Well-Known Member

#54
Pugga Pasti-Dip Free 1983 - 2015... It was a good run

#55
chris4x4 With sufficient thrust, pigs fly just fine. Moderator

#56
WhatThePho? Greg Graffin 2016

#57
WhatThePho? Greg Graffin 2016

#58
40950 Well-Known Member

#59
chris4x4 With sufficient thrust, pigs fly just fine. Moderator

#60
Gearheadesw must modify

Products Discussed in