VG30e head mods
08-12-2008, 06:56 PM
#42
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08-12-2008, 07:47 PM
#43
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IMHO if your going to do work on a VG, start with a VG33. Head work does wonders for our cars as well as cams. With the right IM and custom headers the vg33 should make near 210-230hp. I believe I read that VH45 pistons can be used which will increase the cr to like 9.7cr. Here is the info from a reliable source, this guy has built 400-500whp z32tt and sr20dets.
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Originally Posted by morepower2
A low buck motor would be to use Q45 VH45 pistons in a VG33E blockwhich gives about 9.7:1 compression up from 8.8:1 and are 88mm bore for 3.4 liters. Do a little pocket and match porting, use JWT cams and run SLR or Doug Thorley Headers, top off with a JWT ECU. Run a 2.5" mandrel bent exhaust with peforated core straight through mufflers. Use JWT's POP charger filter replacing the rubber zip pipe with a smooth mandrel bent piece and makes a cold air dam in the engine compartment. This gives just under 260 hp.
A low buck motor would be to use Q45 VH45 pistons in a VG33E blockwhich gives about 9.7:1 compression up from 8.8:1 and are 88mm bore for 3.4 liters. Do a little pocket and match porting, use JWT cams and run SLR or Doug Thorley Headers, top off with a JWT ECU. Run a 2.5" mandrel bent exhaust with peforated core straight through mufflers. Use JWT's POP charger filter replacing the rubber zip pipe with a smooth mandrel bent piece and makes a cold air dam in the engine compartment. This gives just under 260 hp.
08-13-2008, 06:26 PM
#45
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08-18-2008, 12:30 PM
#47
over bore only adds cubic inches- which increases demand for air through the head. what the VG really needs is heads and cams that can breathe enough air for the engine to pump in and out.
head work, proper cams, and equal-length headers would add an ungodly amount of power to these engines.
head work, proper cams, and equal-length headers would add an ungodly amount of power to these engines.
08-18-2008, 12:46 PM
#48
over bore only adds cubic inches- which increases demand for air through the head. what the VG really needs is heads and cams that can breathe enough air for the engine to pump in and out.
head work, proper cams, and equal-length headers would add an ungodly amount of power to these engines.
head work, proper cams, and equal-length headers would add an ungodly amount of power to these engines.
08-18-2008, 06:50 PM
#50
that's right... i was on their site a while back. Hmm. So i guess I'll do the stage1 and some of that other stuff.
08-18-2008, 11:14 PM
#51
I'm using a Isky 256 cam ( .425"/256*) from Nissan Motorsport thru Courtesy Nissan. It's more of a torque/tow camshaft with excellent idle vacuum, and great low, mid range hp/torque. Should be awesome with the additional mods I've completed in the intake and exhaust tract!
08-19-2008, 11:56 AM
#52
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so if i have this right, the best option would be to swap vg30 to vg33 and do the work in the sticky?
second would be the piston swap from the ve30de to get the higher cr? How much of a hp increase would that make?
second would be the piston swap from the ve30de to get the higher cr? How much of a hp increase would that make?
08-19-2008, 02:41 PM
#54
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Also, talking to the guy that flow tested my heads, he said he will try to find piston blanks for a VG30DE, he said he can cut the releifs that are needed and with a little more clearence for the stage 2 Cam
08-19-2008, 06:49 PM
#55
The VE30DE/VG30DE pistons are NOT going to fit in the VG33.
08-19-2008, 06:56 PM
#56
08-19-2008, 07:10 PM
#57
Now if you are building an NA engine, swapping the 3.3 makes a lot more sense, since it makes more than power and torque than a cammed 3.0
If by "piston blanks" you mean new pistons, you are wasting your money. Have reliefs cut into used VG30DE or VE pistons (if needed, how did you determine clearance?)
08-19-2008, 07:15 PM
#58
VH45DE pistons are IDEAL. They not only bump the compression up over 10:1, but the increase displacement to 3.4 and reduce friction with moly coated skirts. This is alleged to make 250hp, but Ive never seen any dyno proof. However, I know for a fact that its enough to blow an auto trans out of a pathfinder. The pistons are hard to find though.
08-19-2008, 07:28 PM
#59
VH45DE pistons are IDEAL. They not only bump the compression up over 10:1, but the increase displacement to 3.4 and reduce friction with moly coated skirts. This is alleged to make 250hp, but Ive never seen any dyno proof. However, I know for a fact that its enough to blow an auto trans out of a pathfinder. The pistons are hard to find though.
i hope it's still there.edit: so it is as smiple as it sounds? just.... take apart bottom end and put the pistons on the stock VG everything-else, put it back together and go?
Last edited by CapedCadaver; 08-19-2008 at 07:41 PM.
08-19-2008, 09:20 PM
#62
then i'm going to the JY this weekend and nabbing the pistons out of the Q that's in there i hope it's still there.
edit: so it is as smiple as it sounds? just.... take apart bottom end and put the pistons on the stock VG everything-else, put it back together and go?
i hope it's still there.edit: so it is as smiple as it sounds? just.... take apart bottom end and put the pistons on the stock VG everything-else, put it back together and go?
Other than tuning, thats it.
08-20-2008, 07:22 AM
#64
Not exactly, the pistons will not just drop into either block. First you have to bore the engine out to 3.4L (6mm overbore on the 3.0 or 1.5mm on the 3.3) The VH45DE pistons will not fit on the stock rods for either engine, so you either need them machined to accept the larger wrist pin, or better yet just use rods out of a vg30de (beefier and no machining required)
Other than tuning, thats it.
Other than tuning, thats it.
what about the other option of just putting in the J's pistons/rods? or would that be too messed-up when trying to get the valve recesses re-machined for the 12v vs 24v?
08-20-2008, 10:10 AM
#65
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Here is the deal, back in the day (99-00) I went the NA route on my old 2nd gen max. I had ported heads, isky 262 cams, protorque TC, udp, exhaust, 60mm TB. By far the head work and cams made the most difference, normally the VG would die off around 5300rpm. After head work it pulled to the rev limiter (6400), and that is how I floated my valves (stock 222k mile oe springs) and destroyed my engine. Take it from me if you do get cams spend the money and get new valve springs, also check your lifters because if they are high in mileage they will "pump down" and you will lose some of the lift/duration from the cam resulting in a power loss.
Once the heads are ported and cams are installed the only things holding the power down are the OEM intake/exhaust manifold. The best flowing VG IM is the one on the VG30DE period! Now the Z32 IM probably won't fit but there is a VG30DET single TB IM that would be easier to fab a lower IM to work on a sohc VG. On the exhaust side the oem exh mani will cut your power, where as a properly designed header will make great power. Finally you will need to tune the engine, lucky there are several ways to do this without great expense. I've seen a dyno of a modded NA VG33 make ~210whp years ago, so I know it can be done. Hell modded NA VG30's with I-H-E-cams-ported heads have done 170-180whp.
Once the heads are ported and cams are installed the only things holding the power down are the OEM intake/exhaust manifold. The best flowing VG IM is the one on the VG30DE period! Now the Z32 IM probably won't fit but there is a VG30DET single TB IM that would be easier to fab a lower IM to work on a sohc VG. On the exhaust side the oem exh mani will cut your power, where as a properly designed header will make great power. Finally you will need to tune the engine, lucky there are several ways to do this without great expense. I've seen a dyno of a modded NA VG33 make ~210whp years ago, so I know it can be done. Hell modded NA VG30's with I-H-E-cams-ported heads have done 170-180whp.
08-21-2008, 06:03 AM
#68
Then get you some good valve springs before you break something. paired with increased rev limit from the JWT and one missed shift, you can float valves and beat up pistons because of the old springs...
08-21-2008, 11:45 AM
#72
My old stock engine was putting down ~172 whp on stock ECU and exhaust with over 200k miles.
with the JWT ECU and 2.5" exhaust, it's noticeably faster. main thing it needs now is a good header and some cams. those are the two things holding back the VE...
with the JWT ECU and 2.5" exhaust, it's noticeably faster. main thing it needs now is a good header and some cams. those are the two things holding back the VE...
08-22-2008, 12:06 PM
#73
08-22-2008, 12:23 PM
#74
iirc your TCU will shift at 5800 on a VG at WOT.... but even so... it's still just a good idea to put in better springs for that. just for peace-of-mind sake, plus your auto will probably die from the extra power of upgraded cams, thus making you consider a 5spd swap.... at which point you'll wish you had upgraded springs.
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