more power from z31

[jbracy7]

what parts would you need to make the z31 (84.5 300zx) faster on the 1/4 mile i have the basics cai, headers, race pipe,muffler. im thinking about ecu+nos+forced induction but not in the near future. it will be track only so the door is open power wise. but shut money wise. ive already gutted it.all interior peices are removed and the a/c is gone. just cant make this thing faster. any help is needed

[nismo 03]

GO WITH TURBO IF U HAVE A TURBO ADD AN IC AND GO WITH A HIGHER BOOST

[evildky]

well since you already said header I assume you have an N/A so the logical power ader is a turbo swap, if thats too much commitiment for you NO2 i a lot of fun and safe so long as you follow the directisn and don't get greedy, a 75 shot will do wonders for you, would likley take 1 second off your ET, and if you're real adventurus, you could always drop a small block V8 in it or a VQ45 or maybe the 350Z motor?

[jbracy7]

well since you already said header I assume you have an N/A so the logical power ader is a turbo swap, if thats too much commitiment for you NO2 i a lot of fun and safe so long as you follow the directisn and don't get greedy, a 75 shot will do wonders for you, would likley take 1 second off your ET, and if you're real adventurus, you could always drop a small block V8 in it or a VQ45 or maybe the 350Z motor?

are there any write ups on here for vq45 install or the 350 motorive herd of vq's in 240's and z32 but could it fit in a z31

[nismo 03]

are there any write ups on here for vq45 install or the 350 motorive herd of vq's in 240's and z32 but could it fit in a z31

no i dont think their is any write ups but u can try hybridz.org and look around they have some fun stuff to read.

and yes the engine should fit the amount of space in a 240 engine bay is smaller than a z31's

[evildky]

I don't know if the vh45 has been done in the Z31, and honestly that motor is a huge pain to deal with, here are some varoius z31 swaps form az zbums pagehttp://az-zbum.com/modification.engine.swap.shtml

[AZ-ZBum]

The VH45 has been test fit, but never installed. It will require a different or flipped oil pan or something along those lines. I've yet to hear of an actual running/installed VH45 in a Z31.

[jbracy7]

does any bodie think indivdual throttle bodies would help this kit is made in aussie land but cost less than 600 usd would have to diy'ed to fit would it make more top end??

[nismo 03]

nice yeah the individual are good for better hp

[jbracy7]

I don't know if the vh45 has been done in the Z31, and honestly that motor is a huge pain to deal with, here are some varoius z31 swaps form az zbums pagehttp://az-zbum.com/modification.engine.swap.shtml

i did more research on this site +a dozen other sites and now im realy confused ok the vh45 is a low rpm (5500)motor because of it long stroke/heavy crank-the vh41can go higher in the rpm band but has realibity issues past 6500 rpm. ive never even seen a vg33 before or a vg30det single turbo 300zx z32 motor???? i thought all z32 were n/a or twins. where does this vg33 come from i cant find any info on this motor

[evildky]

the VG33 came in frontier, pathfinder and the xterra, the VG30DET is a non us market engine, I think it came in some trim level of the z in japan and also the gloria or lepoard, I'm not the greatest with the non us models

[jbracy7]

the vg33de cam in the frontier after 98 before that they hade k24de in them i cant find a engine supplier that sales the frontier engine but many offer to rebuild them for less than 250$ does any body know of aplace where i can find a usdm engine supplier allmost every supplier is jdm crazy/whores from what i can understand its a direct fit for any vg30de,vg30e,vg20e,vg30dett,vg30et. and is basicly a bored over 3liter3.295 liters and is way cheeper than boreing out a vg30. every thing but the headers bolt on to wide

[NissanSportMag(Z31)]

There is no such thing (in the US at least) as a VG33DE motor.

The VG33E started appearing in the Pathfinder in 1996 and in the Xterra upon inception. It wasn't until 97 or 98 that it appeared in the trucks as they couldn't make the engines fast enough (or so I was told).

There are some minor differences between a VG30 and a VG33. Mostly regarding coolant passages. There's also a lot of debate on whether or not a VG30 will allow for a bore to 3.3 liters. Some say yes. Other shops won't touch it.

As far as finding a motor, you just have to try your local junkyard for a regular USDM VG motor. There should be plenty.

[evildky]

the Pathfinder got the VG33 when they redesigned it and made it a unibody which I believe was 96, Thr Hardbody was still packing either the KA24 or the VG30, in 98 they introduced the Frontier available only with the KA24 (this was just before the Renault buy in and Nissan was in trouble) in 99 the Frontier was given the 3.3 as an option (I bought my 99 Frontier SEV6 in November on 98) the Xterra was introduced in I believe 2000 with the KA24 available only in the 2wd manual trans model, all others got the VG33, and in 2000 they offered SC trim level on the Xterra dn Frontier which was a factory Supercharged version of the VG33, this was only available for a few years

[jbracy7]

ok so the frontier has ether a k24e/de and the bodycladed frontier has the vg33e i gonnatry to get my hands on a a few of these engines and try some v30de head swaps----- could you bore out the vg33 0.345 over and still have a realible block are these engines high compesion or boost freindly--- from what ive seen in pictures the engine looks wider on top than a vg30de but the same size on the block????

[evildky]

VG30DE heads will not bolt up to a VG30 or VG33E the headbolts do not line up if you want the twin cam just get the DE t begine with, as for how much bore they'll take a good machine shop can sonic test it and give you an idea

[jbracy7]

thanx guys ill take lots of pic with my new didi cam nikkon with zoom

[NissanSportMag(Z31)]

the Pathfinder got the VG33 when they redesigned it and made it a unibody which I believe was 96, Thr Hardbody was still packing either the KA24 or the VG30, in 98 they introduced the Frontier available only with the KA24 (this was just before the Renault buy in and Nissan was in trouble)

All 96 and 97 Hardbodies were 4 cylinders. There was no option for a V6 those years. I wasn't sure when they reintroduced the V6 option. I thought it was with the introduction of the Frontier, but I believe you when you say it wasn't until the 99 models.

[evildky]

All 96 and 97 Hardbodies were 4 cylinders. There was no option for a V6 those years. I wasn't sure when they reintroduced the V6 option. I thought it was with the introduction of the Frontier, but I believe you when you say it wasn't until the 99 models.

I was unaware that the V6 was deleted in the 96-97 models, I know I looked at the 95 SEV6 in 95 in the showroom when I bought my 90 SEV6, then I was shopping the closeouts in 98 and found the only engine available was the 4 banger, and when the 99's came out, I got another SEV6, I ut a totak of 250k miles between the 2 trucks, the hardbody got 150k of them, it got a waterpump and timing belt, and new tie rod ends and fuel pump, other than that they had regular service, brakes and oil, now I have a Z71, it's had all maner or new parts, thank goodness for warranty, how does cheby get repeat business?

[jbracy7]

well....the junk yards here in texas are a lot of help ive found 20+ frontiers96 and up (engines+ ecu+ harness)all working for less than $1000..... would a z32 ecu work with the vg33 or an aftermarket computer would be best. at first im going to use the truck ecu for the swap. then start looking for power in the block...........a local shop told me that that boreing the motor over any more than 0.255 would cause block instabilty coming soon vg3.5 z31 hell yeah

[evildky]

you mean 99 and up, as we just discussed,96-97 were not frontiers, they were hardbody's and as noted were all 4 bangers

[jbracy7]

im sorry evildky yeah. ive seen these motors up close ant they narrower than a vg30 steaper v shape and a hell of a lot of deck height. the heads are huge. hood clearence is big problem and then theres the funkie looking intake manifold ..............right now im looking into the aftermarket support for the frontier....ps the block is iron heads are alum but its still looks prettie to me

[evildky]

I believe the VG33 is the exact same physical diminsions as the VG30? if it's different it's news to me, I thought it was simple stroke and bore difference, and the oil pan, pickup and intake would all be retained form the 3.0 unless you wanted to do the pathy intake?

[AZ-ZBum]

im sorry evildky yeah. ive seen these motors up close ant they narrower than a vg30 steaper v shape and a hell of a lot of deck height. the heads are huge. hood clearence is big problem and then theres the funkie looking intake manifold ..............right now im looking into the aftermarket support for the frontier....ps the block is iron heads are alum but its still looks prettie to me

I don't think you have a clue what you're looking at.

There is no difference in the "V" shape.

Deck height isn't any different.heads are almost exactly the same.

Yes. The intake plenum is different. But read this:http://z31.com/mods/pathy.shtml

[jbracy7]

f

im sorry evildky yeah. ive seen these motors up close ant they narrower than a vg30 steaper v shape and a hell of a lot of deck height. the heads are huge. hood clearence is big problem and then theres the funkie looking intake manifold ..............right now im looking into the aftermarket support for the frontier....ps the block is iron heads are alum but its still looks prettie to me

forgive druken typeing i was syked about geting one and hade a tear down party with some freinds and looking at them (sober) not much diff just bolt patterns. "the pathy intake" is that the one that looks like infiniti intake mani (spider legs) cause it does'nt look like a 300zx mani

[jbracy7]

this is what i've come up so far-Bore and stroke the VG33. bore it to a 34 and then stroke it to a 36. High compression pistons. Figure out what rods you can run to what rpms. A stroked engine oviously will not rev as high, but if you use good rods then you can rais your redline up to probably about 7000-7500 (just a guess) Eagle rods recomend on the stock stroke vg30 to go no higher than 8500rpm's. I would say the 7000-7500 would be safe for a stroked vg33. Balance your engine.

Do your head work. Its not enough just to port and polish. You need a flow bench and then take out a little at a time. You want to keep your intake taper all the way from the plenum to the valve at a 1-1.5* angle to speed up air velocity as it approches the valve. 5 angle valve job, Cams with high overlap and long durrations. Port match your gaskets! Lots of people over look this Oh and dialing in your cams. You want your cams to open and close EXACTLY as the cam manufacturer suggests. They WILL be off if you use OEM gears.

INTAKE MANIFOLD! You can actually create an intake manifold that will produce actual PSI , (yes positive pressure!) at the valve. This is achieved from TIMED pulses or shock waves from the workings of the engine. Shorter wider runners are better for high rpm (hard to get rpms out of a stroked engine) because they have a higher resonant frequency, and the larger diameter is less restrictive. On the flip side, you can make your runners TUNED and longer. This is how you create PSI. I could go pages just on designing an intake manifold. For a NA application this would bennifit GREATLY.

Exhaust. You want long equal length runners. You also want your exhaust to be about 1mm larger than the exhaust port on the head. This is for anti reversion. You can also tune your exhaust to "sing" along with your intake track. the pulses can all be timed right to actually PULL out the exhaust from the cylinder. This is the scavenging effect. This can also aid in the pulsing of your intake track, as the exhuast wave from leaving your exhaust pipe will eventually meet back up to you exhaust valve and cross over the cylinder into you intake pipe. Your exhaust pipe should stay single for each cylinder and at a size that does not allow the exhaust speed to be too slow or too high. Too slow and the scavenging effect wont work right. Too high and you will obviously have too much restriction in the pipe along with more drag than is desireable that occurs at roughly 450 feet per second. You can tune both your intake and your exhaust to produce peak horspower and peak torque WHERE YOU WANT IT if you know what you are doing!

Engine management. I would recomend an engine management system that allows you to FULLY adjust your fuel AND timing needs. This means full sequential fuel injection and ignition timing. You would need to put an EGT AND a wide band ON EACH PORT (yes all six of them) then you can find out EXACTLY what each cylinder is doing. Once you know what each one is doing you can tune your spark AND your fuel for THAT CYLINDER ALONE! This engine management system would aid tremendously in your goal for 300+hp

All of this stuff that I mentioned is the more advanced stuff. There is a GREAT deal more involved than what has been written here. This info is not the recomended route for the street car. If you are trying to achieve high HP numbers on an NA engine then you will end up turning it into a full race NON STREET engine. Turbo engines allow for a GREAT DEAL of slop in engine design. If there is somthing not jiving in a turbo application then boost will eventually over come that problem. NOT SO in a normal asperation application. Much more detail is NEEDED to make an NA car work very well.

[Glorywagon]

I got a 19 HP briggs and Stratton that might help. Danny

[evildky]

lol, I say you're overthinking and overspending, if you want big power just boost it, overbore with forged pistons fine, but a stroker crank? I don't know of anyone making them so your looking at a 1 off piece and that will cost you

I say overbore the 3.3 with custom forged pistons running about a 9:1 cr, with a single turbo, arp hardware and metal hg's and squeeze it till you have 500 whp, shouldn't be too hard, and keep in mind when calculating max rpm, the valve train can be a limiting factor, so a bit of headwork will be in order, you can engineer the crap out of it or you can just do what you know can be done

and timed exhaust is a very impressive and amazing thing, but has to be tuned to where you want it

and the pathy intake is just a log that puts the tb in the front of the sngine beside the dist, frees up the room in the rear to alow the engine to be moved further back for better ballance

[jbracy7]

ok evildky i will try to keep it simple but no promises ok at first im gonna try to get the vg33 in and running then start building a mydrag car my goal is 10s on a 1/4 by an next year

[evildky]

wow! thats fast! not many Z31's that have broke 10's, keep us posted, and remove everything thats not needed to stop go or turn