4.5 crankshaft 400whp
 

I was just wondering, is it possible to reach 400whp if you swapped in a 4.5 crankshaft?? And maybe just maybe if someone just finished cracking this VVEL!!!????

VVEL is and will probably never be broken.

And 400hp at the crank is easily achieved by TT or Supercharger.
And would cost allot less than building a N/A motor.

lol.. I don't think you understand the Ops question....

Whats not to understand the answer is NO this type of topic has been discussed all you need to do is use the search button.

I don't think your post helped the op at all and your worried that I don't understand the question.:shakes head::icon14:

You will need to build the whole block for the 4.5L as far as cracking VVEL most people dont know whats going on behind the scenes. Uprev has been working on VVEL for sometime now trying to understand the affects of the tuning and parameters that they are tuning at the moment. A 4.5L can definitely support 400whp what it really comes down to is what compression, supporting mods and tuning will get you there. I know GTM can build you an NA motor capable of what you want but at what $$$... Their full race NA motor is like $35k...

Mike

First of all he was asking about 400WHP not Crank.. Big difference.

Second, of all the VVEL is very close to being broken from what I understand but it doesn't seem to be very promising gains. From what my tuner has told me, they have actually been able to change lift and other things of that nature but instead of gain there was decrease and even a blown engine.

I don't think you answered one single question that the OP asked... He asked if its possible to achieve 400 WHP off a 4.5 L engine and it is quite achievable with the right amount of $. So the answer is not "NO" as you state.

cracking vvel will only help the forced induced guy and unless it is fully understood its more of a liability than anything. Best we let cracking VVEL go, its not worth it and clearly major power can still be had.

the whole reason I started the thread was that I wanted to know how much can someone gain from a 4.5L crank

and yes I know there is a search option, the thing you don't know it sucks!!

:icon14: IDK if you can put in a 4.5 crankshaft......but you can bore and sleeve the cylinders out to make your block a 4.5L block

I wouldnt hold my breath on VVEL tuning. GTM posted a video saying they accomplished approximately 800WHP. I personally think that a 400bhp N/A 370z is very achievable

P.S. I know what he means just the way he asked was funny to me

:icon18: yea its a pain in the *** bro i agree, I stick with google and books.

I don't really know why I mentioned VVEL from making profit I think it will not make that much of revenue to whom ever is working on that,

back to my question, I think it is possible GTM have the part on their website but like Bullit said it might be cheaper to go FI but still wondering how much of a difference will it make on an NA engine?

If VVEL gets "cracked" this is a good question

lol I wish I never mentioned VVEL, sorry I confused everybody the question was for the stroker.

I think 4.5L with a new crankshaft running high compression will get you 400whp, however it is speculation because no one has attempted such a project.

yeah I know, it works on the 350z did anyone hear about anything?

the reason I'm asking is that if it could get our cars to 400whp or close, I'll be very surprised that some track guys didn't attempt do try this it's gonna be a lot more reliable than any FI I guess.

its the price youll have to pay to achieve this.

You can make 400rwhp with stock displacement. You can make 400 rwhp with less than stock displacement. You just have to build everything else in the engine around the goal. The smaller displacement an engine is, the faster it will have to spin to produce the power. To increase displacement is typical in all-motor builds so that less RPM is required and therefore the cam profiles and intake manifold design doesnt have to be as far optimized for high RPM, therefore maintaining better low engine power and engine response for a nicer driving car. Ever drive a S2000? They well over 100hp per liter but they are 9000rpm engines... their low end power sucks even with the fact there it has VTEC allowing 2 seperate cam profiles.

The 370z, since it has VVEL and continuously variable cam timing, means that the valve timing and lift can be optimized for all RPMS dynamically, meaning it wont hardly suffer losses of low engine power from building it to spin faster and make greater top end power. If you could do it with the stock intake manifold, in theory I dont know if there would be any low end losses?

If you had a 4.5L, I bet you could make 400rwhp by 8500rpm. Older VQs are notorious for grenading oil pumps and therefore destroying half the engine when spinning 8500-9500rpm. The VQ37VHR may or may not have the same oil pump problems, we will find out over time.

As for cracking VVEL... VVEL seems to be a really advanced closed loop feedback system that is continously optimizing itself. I cannot imagine that any ALL MOTOR cars are going to gain anything at all from playing with it... im sure its extremely optimized already from the factory. But I doubt that the VVEL system is boost smart... meaning I doubt it is optimizing as well as it could when you boost feed the VHR engine. This is probably a good portion of why the 370z makes like 100 less torque that the older DEs do at the same HP when boosted.

I would get Sam's opinions on what he thinks could be gained from the VVEL.. I think he is probably the one in communication with UpRev the most about whats going on with the progress on the VVEL recalibration and any existing results from toying with it.

edit; BTW there is a VQ35DE all-motor that broke 500hp on the engine dyno, so thats right about 400rwhp im sure.

this is a very informative reply, thank you very much phunk.

I think it will be great for the guys that don't have a problem with $$$ :stirthepot:

you are going to have a really tough time spinning the VQ fast enough to make close to 100hp/l at stock displacement, and even moreso with a stroker setup.

at 3.7L, you are spinning the pistons at something like 75 and a quarter feet per second. With the weight of the pistons and the balance issues, I don't think there is much more in that engine....and there is even less headroom when you are talking about a stroker kit. At 8k, you are spinning something like 85 fps.

hopefully someone will undertake the project. I'd love to see the results, but it is not something I'd start on without some serious experience doing NA builds.

I'm promised my self not to be the lab rate in any builds until I can afford another car so not happening for me anytime soon haha

but it should be interesting, I remember Sam said that they are working on a 4.2 with a SC stage 2 with an aim of 600whp