I posted this i the forced induction section but i haven't got a response yet so i'm tryin here

VQ30 Questions
I have a 4th gen and i've been trying to find info on internal engine mods. I started in the 4th gen forum(Cams) and eventualy got sent here.

So do any of u guys use after market cams, heads, conecting rods, ect.?

Because so far the highest hp maxima i've seen on this site is 400hp. >>>> http://members.verizon.net/~vze4yqyk/Main.htm

Why can't we get more out of these 3L's? I've seen toyoda supra inline 6, 3L's with 700hp. So whats the major difference? Can we do this?

I just figured that internal engine parts would be the way to go.
I may be headed the wrong way, cause i'm kinda new but it doesn't seem any one else has tried this.

I've been told that JWT makes cams. JWT also makes ecu upgrades but not for the 4th gen. (at least its not listed)
I haven't found any other internal upgrades.

Any body have any ideas?

JWT also makes ecu upgrades but not for the 4th gen. (at least its not listed)

Lastly what are the engine specs (or a link) for the VQ30? (Rod length, stroke, bore)
I think the stroke is only 3in. This would lead me to think that we can rev much higher than 7k? Just a thought.

Thanx, i'm srry if this seems like i don't do enough of my own research.

 

I don't have all the answers, but here's a few:

The VQ30 is a V6, not an inline 6. There's a big difference mechanically.

JWT does make an ECU for the 4th Gen. It is made for 1995-96 models, but has been known to work fine in a 97-98 model, but with a Check Engine Light. I do not believe it forks for 99's (someone correct me if I'm wrong)

 

I Think MardiGras got over 400hp, and there are a few others around 400hp aswell. I remember from a few weeks a go I read about Nissan testing the VQ to handle upto around 530hp or so until the block cracked.

Supra engines are known to handle loads of power on stock internals. The VQ can handle quite a bit aswell, but not anywhere close to the supra.

If you want to get 7k rpm, you will first need the MEVI, which gets rid of the power loss above 5500rpm. Then ofcourse an ecu that gets rid of the rev limiter.

About the JWT cams, Ive read that its not worth the money really. The price/hp ratio is like a few hundred $$ per hp or something like that. Best way to get power NA is ypipe, intake, MEVI, UDP, and a few other mods (cant remember atm).

Hope that helps.

 

I'm pretty sure that with a turbo or sc you can get hp over 400.

 

Thanx
do you think with upgraded internals it could be higher? Is the block aluminum?

I have a 99' wil the ecu work?

what is a UDP? i don't think i've heard that one.

Thanx for all the help

 

Wow drag results for the site. Either a 1.8 or 1.5 60ft!!!

 

i'm pretty sure it's an aluminum block...

the benifits are few w/ an upgraded ecu unless you're doing some crazy stuff... ie supercharger w/ mevi and nitrous... stuff like that... good to raise rev limiter tho...

UDP = under drive pulley's... this is used in place of the stock drive pulley reducing the weight of it causing the engine to not work as hard to push these belts/pullies

hope that helps...

mike

 

Its not that no one has tried this you have to remember were not driving Supras or Skylines we drive a FWD family sedan. As far as built internals go we are on are own for the most part, whereas theres tons of stuff available for the Supra. Also if your gonna build an engine to make this kinda power you will have to somehow figure out how make the tranny handle all this power.


But anyway today is your lucky day, heres some of the VQ30DE specs Ive collected over time from various sources -

Bore = 93 mm
Stroke = 73.4 mm
compresion = 10:1
Intake cam = 8.6 mm lift
Exhaust cam = 8.6 mm lift
Intake valve diameter = 36 mm
Exhaust valve diameter = 31.2 mm

JWT cam specs
Intake/exhaust cam = 10.64 mm lift

Credit: Haynes Manual, Mardigrasmax, Daniel B. Martin, and I30Krab

 

You can get more hp by upgrading internals. It's just that it costs a lot of money and most would have to be custom jobs(= more money). JE I think makes pistons for our car. As far as rods, heads, etc you might be able to use 300ZX parts but I'm not sure.

 

VQ30DET internals is what i'd use... can hold up to 500 hp

 

You could build a 1000hp VQ if you had the money to throw at it. Money is the limiting factor. No one's dropped $40K into a VQ motor yet. The 700hp supras have that much in them.

The VQ is an aluminum block, the 2JZ-GTE is iron, hence it holds more power by itself. Not to mention the internals are beefier, the compression is lower, and the fuel system is better. Thats why you see 700hp supras on stock blocks and only 400hp VQs.

JWT makes ECUs for 4th gens.

$1200 is buying 4 camshafts. That's not too bad. Install is a ***** though.

 

Thanx this helps alot. Just a few more i was wonderin about:

rod length
deck hight
timing of cam (duration @ .05 lift)
If i'm going to grind a cam i'd like to know the stock specs.

Thanx, hope someone knows.

 

Any one know??