VQ40DE vs stroked vq35de
VQ40DE vs stroked vq35de
As I want to enter the realm of boost again I want to tackle it with a more efficient approach. Bottom line I want more displacement to kick the turbos in sooner and overall get more power. I picked up my 07 g35 from infinity the other day and began speaking with the lead mechanic who has been doing some building for quite some time now. I mentioned to him that I was interested in stroking my engine this time and matching it with the greddy 20g tuner kit and shooting for around 700whp. As we all know these kits to stroke the vq35de are about 10k+ for the 3.5 -> 4.0. Now purchasing a vq40de engine is a much cheaper solution. My research indicates that the vq35HR tranny will bolt up to the VQ40DE housing. ( correct me if im wrong). The head's engineering is supposed to be the DE revup heads. So the technician said that the vq40 with the vq35 heads and ecu everything should bolt right in without radical modification. With the VQ35DE heads it should raise the compression a bit and end up with a pretty mean 4L N/A monster. The best part about this swap would be that the VQ40DE has Direct Injection. What problems will i encounter with this? will I have to produce a completely new fuel set up? More importantly will the revup ECu be able to control the different style of injection. I guess in conclusion im looking for any and all imput on this subject. If anyone has experience in the field im all ears! I feel like this would be a cheaper solution than buying a stroker kit.
i will plan on using a HKS FCON VPro to tune with will it be able to handle the DI? The direct injection is screaming for the Boost!
Last edited by athensgls; Nov 23, 2009 at 02:37 PM.
Pretty sure this has been discussed before, and I think I remember that the VQ40 block is taller then the VQ35 and wont fit in the engine bay.
Last edited by thawk408; Nov 23, 2009 at 02:43 PM.
I'm going to bet the internals won't be strong enough. I would also have to bet the cost effective intention you have is going to blow up in ya face. In no way do I mean that to sound insulting bbut really if your looking to build a boost setup dont look for a new way to do things. Stick with the already researched and developed rout. Sounds like a huge risk with very slim benefit.
Last edited by quietkilla6; Nov 23, 2009 at 04:01 PM.
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if you use 35 heads you will not have direct injection.
if you did keep the 40 heads and DI then you would need the entire fuel system from the 40--that means injectors(very specialized, very expensive, very limited), low pressure pump, high pressure pump, dme, etc. not something i would get into if you are asking questions on how to do this.
as for the rest of it, good luck.
if you did keep the 40 heads and DI then you would need the entire fuel system from the 40--that means injectors(very specialized, very expensive, very limited), low pressure pump, high pressure pump, dme, etc. not something i would get into if you are asking questions on how to do this.
as for the rest of it, good luck.
I think if someone actually takes a systems engineering approach to this and dispel all the myths then we can truly find out if it works or not. We don't know if the rods are as strong as the DE rods or not as strong. If there was an actual engineering analysis done on the motor, and the information posted then this "approach" could be either mitigated or further engineered.
If the OP wants to do it I suggest he buy a short block if he can't find one get a long block. Start with the information he already has, which is the VQ35de heads will fit on the VQ40DE. This has to be the first step in the process because if the vq35de heads do not fit then he would have to use DI and from the earlier posts it seems that it is very expensive. This would be the deal breaker right there in terms of short term and long term costs.
IF the VQ35DE heads fit then here is a rough list of what could be done to "mitigate" the motor going in the Z. These are in no particular order.
1. Check Motor mounts
2. Mount 6 speed tranny to motor.
3. Which hood to use.
4. Which wiring harness.
5. Other misc stuff that goes with an engine swap (feel free to add to the list).
If someone can get a basic NA VQ40DE motor working in a 350z then boosted applications could follow. But ONLY after putting the motor in the Z is mitigated I wouldn't think about boosting anything.
If the OP wants to do it I suggest he buy a short block if he can't find one get a long block. Start with the information he already has, which is the VQ35de heads will fit on the VQ40DE. This has to be the first step in the process because if the vq35de heads do not fit then he would have to use DI and from the earlier posts it seems that it is very expensive. This would be the deal breaker right there in terms of short term and long term costs.
IF the VQ35DE heads fit then here is a rough list of what could be done to "mitigate" the motor going in the Z. These are in no particular order.
1. Check Motor mounts
2. Mount 6 speed tranny to motor.
3. Which hood to use.
4. Which wiring harness.
5. Other misc stuff that goes with an engine swap (feel free to add to the list).
If someone can get a basic NA VQ40DE motor working in a 350z then boosted applications could follow. But ONLY after putting the motor in the Z is mitigated I wouldn't think about boosting anything.
id say that go to this forum and ask the same questions
h t t p: // www . club frontier . or g /
might be more cost effective than buying one and doing it yourself.
There has to be atleast acouple frontier owners that have put time into those motors are have info on strengths and weaknesses.
h t t p: // www . club frontier . or g /
might be more cost effective than buying one and doing it yourself.
There has to be atleast acouple frontier owners that have put time into those motors are have info on strengths and weaknesses.
Last edited by quietkilla6; Nov 24, 2009 at 02:47 PM.
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