im looking into building a N/A VQ37 so far i plan on installing at least a 90mm stroke if not a 96mm stroke and keeping the stock 95.5mm bore and 11:1 compression ratio. im kinda torn on which cams i should use, mostlikely they will need a lot of overlap. My goal is to make hp in the 5000-7000 range and am changing the vavles and springs (still keeping the stock size but making the vavles lighter) and am looking for acceleration in the 100-160mph zone. my only questions are will the cosworth pleum, along with a good port and polish, aid in the flow of air to fill the cylinders at that RPM and speeds i know ill need a volumemetric efficiency of 85% or more, does anyone here know the length of the cylinders in mm or in. im concerned that i might throw a rod and at what is the maxium ft/sec2 of pistion acceleration that the rods and bolts take. i am planning on using 550cc injectors and can't seem to find aftermarket fuel rail does anyone know if there one out, im planning on using the AEM fuel and ingition controller and irridium spark plugs.if there is anything i missed please tell me, i'm still in the mathamatics part of the build so any help would be great.

 

just a few quick thoughts that id run by you. if your going to stroke it why not bore as well even with a small .02 overbore? check out GTM's high rev stroker and they also make NA specific cams as well. you can find aftermarket fuel rails from CJ's Motorsports of Altered Atmosphere. You will probably want to use a standalone like the haltech or HKS unit for that kind of build. you cant use the Cosworth Unit for the VQ37s unless you mean your going to use the old vq and stroke it out to 3.7 best of luck to you

 

thanks rr_z33 thats some of the information ineeded, ill look into the gtmotorsports stroker kit. the reason why im using the stock bore size in my math is cause a bigger piston weighs more than a smaller one and intern takes more force to accerelate to TDC and put tremdous stress on the rod to stop it at TDC, along with the point that im looking to make power in the 100-160mph so a bigger pistion would possibly be unstable at that speed for durations of 1 minute or more. a .020 bore does not sound like it would throw my mathamatics out-of-wack so im looking into it. the engine i have is the VQ37HR bottom end but a 3.5l head and induction srry for not specifing.

 

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for a build like this, does anyone know if a "true" cold air induction is better than a short "ram" air intake. i know the cold air will give me more denser air but will it be able to keep up with the higher RPM and speed, my main concern on this build is keeping the pressure in the cylinders at a maxium.

ill post pics as parts start to arrive and get installed...

 

for sure get a short ram, or stock 06 airbox with drop in filters
the cold air would cause pressure loss,
more bends

 

pressure loss? there is no pressure to loose...you're not sucking in pressurized air

it won't make any difference what intake you use

 

you sound knowledgeable on the topic sir. good luck to you, and i can't wait to see how it turns out.

 

In for what sounds like an interesting N/A build!

 

since im stuck at school the only idea if been able to come up with is to get the stock 06 box and drop a filter in there then attach intake piping to the filter so no water can get in and attach a funnel to the outside of the box to keep my pressure recovery around .80 to .90% and then fill the box with ice so i can cool the air as it enters the filter to give me more pressure, if this idea works it should help with the high RPM pressure loss. i wont be able to assemble it till saturday and will post pics of during/after installation and a video of the test drive.


aslo does anyone know the cfm flow rate of the cosworth pleumn

 

Cant wait to find out how it turns out.

 

Dont you have dual tb?...

 

this is my engine bay i have a vq37 bottom end and a vq35 top end

 

stock fuel system would be more than enough I believe...550cc injectors would be overkill. stroking it without boring it doesnt make much sense to me either. i'd rather have it bored to 3.8 liters and have it revving higher than just stroking it. have you consulted a professional engine builder that REALLY knows what theyre talking about?

 

How did this come about?

Is your vehicle a G35 or a G37?

If it's a G35, how'd you get the VQ37HR installed?

If it's a G37, why'd you take the dual intakes off?

I'm a little lost...

 

OMG, there are so many things wrong with this thread it's actually funny. Here's hoping this truckload of BS continues until all-out hilarity ensues.

Good luck, OP!!!!

Will

 

well since u know what ur doing and what im looking for y dnt u shoot ur ideas at me and plz display mathamatics to back up ur suggestions

 

it has a 87mm stroke instead of the 81.4mm thats the only difference between my z and the standard vq35

 

So what you are saying is you have a stroked vq35 NOT a vq37, from what every tuner out there said these two motors are completely different, if you want high HP NA you should stay away from stroking and just get a full cosworth long block with 12:1 compression, 1mm oversized valves, and agressive cams.

 

I knew you would find this thread somehow...I'm just going to sit back and watch the bs fly

FYI to the OP - when you try to ******** people who are alot smarter than you, pay more attention to the details. Among your mistakes? A VQ37 doesnt have 87mm stroke, and in your pictures, you don't have a VQ37 block.

Anyone want to help on my new project? I'm converting my car to run on woodchips. I plan on using a turbo to speed up the burn process....