Higher RPM's
 

what modifications are necessary in order to increase an engines redline rpm level?

1. ecu - jwt modifies the stock ecu to run the engines to about 7,000 rpm, which is the limit on the stock valvetrain
2. valve springs - needed to allow higher rpms without valve float
3. if you want extreme revs you can just balance and blueprint the engine to damn near whatever you want with the proper internals (light weight and such). you'd also need to do some major headwork and get some better cams to allow the engine to breath enough air for power that high up.

Why ToDo that?

ECU draws the red line... somewhat later valves.

the valves on these engines start floating around 7000 rpm, which is where jwt tends to modify the redline to. if you want any more than that, you'll need to upgrade the valvetrain. i'm not sure what the stock bottom end can handle though.

is the engine making power or losing power at 7K RPM? (i say B)

/me looks up that $8k VG30 race motor....

I say it makes power.

then again, if you're talking stock, it's losing hp @ 5500rpm :run:

looks up orig post asking to raise limiter..not build race engine.

of course a race engine can rev past our redline and it will make power..that's why it's a RACE ENGINE. :slap: :slap:

it may be losing power but its actually been proven to be faster than a nearly equally modified max with a 6,000 rpm redline. most likely due to dropping into the power band better when shifted. that'd be my guess.

So if I get the springs and and the ecu what can i raise my redline to? And where can I get some performance valve springs?

I cannot see any benefit in rising rpm on VGE, even the sound is awful, not to speak of the lost acceleration. Building race engine is another matter, but whyowhy use VGE...

Maybe THE feelings are better as acceleration is poorer? But what do I know, Ive already got family and kids...

bring on the bandwagon!! :run:

for less money, bolt on a bottle of NAWZ and you'll have a lot better acceleration and reliability than a raised rev limit.

here's some interesting stuff i learned yesterday:

our engines pistons are moving at 3,270 fpm (feet per minute) at 6,000 rpm
a ferrari F1 engine's pistons move at 4,870.44 fpm @ 18,000 rpm

if you were to go say to 8,000 rpm on our engines the pistons would be moving at 4,360 fpm.

the rod to stroke ratio should be about 1.858 (the higher the number the higher it can rev and the more top end power it can have but the low end would suffer more... its kind of odd but our engines have a higher ratio than the 1.8 4 cylinder in my MR2)

kind of some interesting things to think about. i'm going to look into this more for some good high revving engine comparisons.

can person just add NOS and that's it. don't you need proper fuel delivery, A/F ratio, and fabrication of parts?
When JWT raises the rev limiter it isn't safe? Don't they test these things out first before selling them to the public?

they sell them to the mechanically inclined that realize the risks. Its not the company's job (or the government's job, but thats a different story) to protect people from themselves.

Putting five people in a boat built for four, can be safe, can be unsafe. Depends on circumstances... GeneRally its safe to say: dont do it if u want to keep safe.

Want to go faster, VGE? Raising only RPM will not help, if power curve drops after 5000. U need mods in intake, exhaust. Then start racing. And calling for tow truck, taxi, junkyards for cheap VGE tranny's ("sorry, sold out")...

There has to be a plan if u want to go faster. It starts by selecting the right building blocks. Ask these forum wise tuners what blocks to use, how far to go. Maybe u end in V12?

well of course you have to add the proper amount of fuel but when you buy a kit it covers all the basses theres no fabing parts or anything and it comes with jets to give you proper A/F ratio which is fine for a low HP shot but thats if you consider 35-75 extra HP low over that i would suggest checking your A/F ratio with a wideband

How much would a kit for a VE 5spd cost compared to an ECU and springs?

definitly upgrade your valve train your opps...there went a rod....and as far as 7000...its a loss in hp.

like i said before though, going up to 7000 rpm may be a loss in power but its been proven to be faster than an almost equally modded max running to 6,000 rpm. a couple guys on this forum tested it out before. they said when the max with the 7000 rpm redline shifted at 6,000 they were nearly dead even.

My VE30DE is still pulling at redline (The JWT 7200 redline) :shy:

i have tuned ECU raised rev limit to 7000rpm on VGE, have intake and a few exhaust upgrades, but power falls off sharply after 5000rpm, acceleration seems weak... it ain't worth it to spend the $600 for a JWT ecu to raise rev limit if u have a VGE.

i've yet to install a cat back exhaust tho. i'm thinking that could have been holding up some horses.

VG = 2 valve heads. No way around it, your high rpm hp will suffer. But with a Y pipe, intake, udp, flywheel and a good catback, high rpm hp can be improved quite a bit. The JWT is NOT just for the raised limit. Most of the benefits are in the revised ign/fuel maps. The rev limiter mod is a bonus.

A good cam would do wonders for the VG. But very few are willing or able to do this type of work.

real soon im getting that cam at cattmanperformance.com for my vg....that is where the real power is

I'm comming over when you tear your motor apart. :hs:

might as well u dont live but 40 min maybe

I can attest to this :gapteeth:

Do you have a y-pipe? UDP? Intake?

Catback should be on the bottom of the list

for breathing mods, have intake, y-pipe.. and a universal muffler.. that's about it...

wow dude, that cam is listed at $550...now that's an expensive bang/$ ratio. i could never justify spending that much money on my old max... unless for a turbo of course..

gotta pay to play...you in?