Higher RPM's
05-17-2005, 10:48 AM
#2
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.
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.
05-17-2005, 11:38 AM
#4
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.
05-17-2005, 04:49 PM
#6
Originally Posted by DanNY
is the engine making power or losing power at 7K RPM? (i say B)
I say it makes power.
then again, if you're talking stock, it's losing hp @ 5500rpm
05-17-2005, 04:56 PM
#7
Originally Posted by antonthegrey
/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
I say it makes power.
then again, if you're talking stock, it's losing hp @ 5500rpm
of course a race engine can rev past our redline and it will make power..that's why it's a RACE ENGINE.
05-17-2005, 05:17 PM
#8
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.
05-17-2005, 05:40 PM
#9
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Thread Starter
Join Date: Nov 2004
Location: Lawrence, NY
Posts: 132
Originally Posted by mtcookson
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.
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.
05-17-2005, 11:40 PM
#10
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Join Date: Dec 2004
Location: EU Scandinavia
Posts: 4,323
Originally Posted by DanNY
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.
of course a race engine can rev past our redline and it will make power..that's why it's a RACE ENGINE.
Maybe THE feelings are better as acceleration is poorer? But what do I know, Ive already got family and kids...
05-18-2005, 07:42 AM
#13
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.
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.
05-18-2005, 10:39 AM
#14
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Join Date: Nov 2004
Location: Lawrence, NY
Posts: 132
Originally Posted by Matt93SE
for less money, bolt on a bottle of NAWZ and you'll have a lot better acceleration and reliability than a raised rev limit.
When JWT raises the rev limiter it isn't safe? Don't they test these things out first before selling them to the public?
05-18-2005, 10:56 AM
#16
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Originally Posted by Akuma2001
...When JWT raises the rev limiter it isn't 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?
05-18-2005, 12:05 PM
#17
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Join Date: Jan 2002
Posts: 3,371
Originally Posted by Akuma2001
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?
When JWT raises the rev limiter it isn't safe? Don't they test these things out first before selling them to the public?
05-19-2005, 12:40 PM
#20
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.
05-19-2005, 01:02 PM
#22
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Join Date: Jul 2004
Posts: 417
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.
i've yet to install a cat back exhaust tho. i'm thinking that could have been holding up some horses.
05-19-2005, 01:10 PM
#23
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.
A good cam would do wonders for the VG. But very few are willing or able to do this type of work.
Originally Posted by Maxzilla91
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.
i've yet to install a cat back exhaust tho. i'm thinking that could have been holding up some horses.
05-20-2005, 01:01 AM
#28
Originally Posted by Maxzilla91
i've yet to install a cat back exhaust tho. i'm thinking that could have been holding up some horses.
Catback should be on the bottom of the list
05-20-2005, 10:03 AM
#30
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Join Date: Jul 2004
Posts: 417
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..
Originally Posted by 3rdgene
real soon im getting that cam at cattmanperformance.com for my vg....that is where the real power is
05-20-2005, 11:15 AM
#31
Originally Posted by Maxzilla91
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..
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