Need some info on this one... I just got my 2nd VQ30DE engine, it has about 130k and I'm in the process of pulling down the motor.. I will do internals, but I need to know which company provides the best in Pistons and Rods?? I've heard of companies like Crower,JE,and Aris, hopefully you guys can point me in the right direction. With repect to cost, what are we talking about $1800 for rods and pistons?? I also would like to get these pistons in 9:1 compression, so I can push for the 15 psi envelope.

Next on my list are Bolts and Studs... Where can I get these? Who makes them?? How many do I need???

Another component are Head gaskets... Again where and who???

In addition to all of this, I would like to get experimental and install the 3.5 VQ Crank into the VQ30DE Block. I remember a fellow org memeber saying it's a direct fit.. Please if there are any write-ups on this keep me posted.

I can get the 3.5 Crank for $200. I know by changing the stroke the displacement will be 3.3. So yeah I'm planing on making a VQ33DET or equvilant when everything is said and done. Hopefully I can get some good HP gains with this Modification?

After the upgrade should I consider changing the Valve Springs since the motor has 130K?? Maybe some info on what sub-components of the motor should be replace would be helpfully. I think that covers most of my questions. Thanks...

 

Haha, I really do not know what I am talking about but I will talk.

Call SGP in houston, they can order you can kind of pistons and rods you want. I think you can also order the ARP head studs from them. On the headgasket it will probally have to be custom. I think with the VQ35 crank and the VQ35 rods it really raises the compression high. Like 11:5:1 or something.

Call an engine builder he can tell you what to check for like bearings, valve springs, oil lubrication, and other things that go into building an engine.

 

Hey You and I are no the same boat I just got my new VQ30 last tuesday and I am about to start on the tear down of the block. I am not going the stroker way because I think that the turbo I have in my heart will keep me grining . But just like you I am beinging to look around for a good machine shop, and dealer of pistons and rods. To port the heads... the new pistons you know. I hope you don't mind we help each other out in the process. I wouldn't mind letting you know if I got a good deal on piston and rods valve springs all of the bells and whistles. To make a engine capable of serious boost. So if you care to I will give you my email address. awildmex@yahoo.com
keep in touch
Henry.

 

Spanishrice,
do you have the # to SGP? I'm also in the same boat as Morfeus17 and mexnamax.I just got my new engine last week too, can't wait to start the process.

 

the custom pistons would lower compression down, but i dont know the formula to figure it out.

the crank is fine but you would have to have the rods shimmed so that they will fit correctly. compare the two factory fms and it will tell you the difference in the measurements.

for the head gasket, i think there is a copper grex (greddy?) one for a 350z that has several layers. they're sandwiched together so you can split them and make a custom.

i dont have the 3.5L fsm so i cant give you the measurements on that one. but i'll look at my 98 in pdf format tomorrow. if someone has the 2002-2003, could you email it to me?

i'll try to post it by tomorrow nite.

if you look at the vg30dett schematics, you'll alsosee the evolution of the engine.

theyre all pretty similar

 

I will call SGP and inquire about the studs, rods, and pistons..

With respect to the crank, I'm not sure on the specs for the VQ35 vs the VQ30. But I thought the VQ35 crank will allow for a more deeper stroke... Maybe I'm wrong, but it should increase the overall displacement of the motor resulting in an increase in torque and power.

If I were to use the VQ35 crank and turbo spec VQ30 rods and 9:1 compression pistons, will my compression be higher??? I would think it will remain at 9:1 when the piston is fully compressed??? I guess I would need to do some more reseach on this... Thanks

 

No problem mexnamax... We can help each other out on this one.. Two heads is better than one... Here is my email address --> Morfeus@optonline.net

I know this little project will take me a while to complete, but hopefully in the end it will be worth while for both of us... Keep in touch.

 

it will give you more displacement because it makes the engine into a stroker, but the vq30det rods are too thin to shim where they match up to the crank.
youre going to need custom rods. i think ferhan was working with eagle

 

Good looking Slimer, I could use all the info on that 3.5 crank conversion. You mentioned the rods be shimmed... They won't bolt up correctly?? I don't like the idea of shimes to make something fit... I would hope your wrong on this one.. That sonds like added work... But whenever you get some info you can PM me... Thanks.

 

well, i think that im using the wrong terminology.

i think i shouldve said mil?

its just shaving micrometers off the inside of the hole.

i was thinking of the jwt vq stroker motor when i stated that.

jim wolf was trying to build a vg/vq hybrid, but they had to use shims, cuz the crank wanted to shift over (cuz its longer)

they also had to deal with the firing of the cylinders (vg-3rd cylinder, vq-4th cylinder)

the two vq's both up together better because theyre based on the same engineering.

 

So the VQ35 crank diameter is larger that the VQ30??? I would definatly need the mesurements between the VQ30 and VQ35... But otherwise it sould not be to difficult then..

 

thats right. but if you ordered rods that have the same specs as the 3.5L they would be fine, you would just need to figure out what the difference in compression would be.

sr20den or icey would probably have the formula

 

Look at you all, now you got me thinking about going along with the stroker engine. If we can all get the necessary information to make this work it would be a hell of a project. But I have some Q's? Are all of us going to go FI or is someone going to go NA just because this is going to be a new engine that has not been tested much and it characteristics are unknown. The VQ30 has been stripped to its bare bones and proven itself to all of us here but. I just don't want to spend more time worrying about correct piston rod and crak issues than everything eles, like fuel management which is proably going to change with the specs of the engine. You know Air fuel ratios, injector sizes, cam grinds. Don't get me wong I am all about bigger and better things but the only stoker that I have dealt with was a chevy 350 to a 383 stroker, and I did not have to worry about that stuff. But it looks lie there are 4 of us now that are going to have built enignes in the works.

 

I can't speak for the NA guys, but for force-induction "There is No Substitution for Displacement" With the crank modification you should be able to produce more power with less boost.

I don't think that this Mod will negatively affect the over-all characteristics, like Fuel Management, Air/Fuel ratios, etc.. I feel it will improve the dynamics of the motor more so than hurting it...

Think about it... We have a Family Sedan ment to be an average car. Now, the Maxima has evolved into Super Sports Sedan.. The car overall is robust, we have people, including myself, running Boost and other mods on the motor, with bearable, little, or no issues. The motor is still stock with repect to cams, rods, and pistons and we are still forcing compressed air down the motors "Throat"...
Yeah you would need to get more fuel to accomidate for added air, but we can still push boost nonetheless..

In fact TCing the Maixma is still a Mod in the Beta Stages and it seems the vehicle still can hold its own.. Like I said earlier, I need to do a lot of research, before diving into something new. The thing to remember is, in the performance arena, it will cost money one way or the other...

 

I just got my turbo in last week so ya I'm going FI. Now your guys got me thinking about stroker my engine, but i still don't know if i want to do that. Does any one have the # to SGP or can i find it on the internet.Good luck to all in there building enignes.

 

You guys need to talk to Dixit.

 

ferhan and i talked about it before dixit did it.

dixit really knows whats involved, so ya, talk to him. i just know what the fsms say.

 

If you put in the 3.5 crank then your compression ratio would be 11:1. You would need the 3.5 crank and rods or after market rods that would fit a vq35. In order to get a 9:1 compression ratio you would need to get 8:1 if you based on vq30 crank.

 

if done right you will get a 3.35 L stroker. i have already done this. i have had it worke dout for over a year and a half already. just remember one thing, it will take a lot of time and money to get it all done and done right so it will work. i had one shop do this for me a little over 2 years ago and he did one crappy as* job of it. that project was a total waste of money and a lot of it. the new one i had done was done right but i helped and supervisored the process the whole way. the only thing i did not do to it is cyro treat it. so do really hope the block will handle anything i throw at it. the compression is at 8.0:1. my engine is just sitting at the shop until i can finish the design for my turbo kit and gather the funds to do it.

anyways, parts will cost you some nice $$$, the machining may cost the same as parts or upto twice as much depending on how slow the mechanic works. so good luck.

Ferhan