hydra do you think the 300rwhp mark can be hit with a revup tuned. With cams. Or without?

 

It should be doable without cams.

 

When you say 300whp what kind of crank HP you talking?

 

What ever the transmission losses may be, but how much is that?
I don't know.

 

What I mean is, it's one thing to get 300whp out of a dyno when the stock engine is in the high 280's on that dyno. Totally other thing to get 300whp out of a dyno when the stock engine is at 250 on that dyno.

Seriously. https://my350z.com/forum/images/smilies/icon18.gif
I think your joking. You can assume the same proportional increase in HP that you get to the whp to the crank and it give you an idea of what you have crank. Your way to smart for me to be telling you this so there must be something else going on. I know it's not a perfect assumption but it's plenty close for little NA gains we are talking about.

 

no faith ^^^ lol

 

my concern always has been the fact that I don't have the variable exhaust timing...

 

yea i have it, but i mean it only does its magic uptop from what i seen beyond the 100mark is when the revup seems to actually do work. Below that its really hard to even notice the difference. I did a run with on teh same road on a highway with both my zs one day after another. When i had both. I dont know when VTC kicks in, but after 100+ about 115 i would say, she opened up a different note and was less stressed form there beyond 135+. WIth my 04 she was great to about 95-100 then it was like watching the needled bench press its max. I dont understand when it kicks in or when its effect really shines, but my guess is that it has to be top end. Because thats where i see the gains of the revup. Now if i can get a red stock 287 in orlando. To race a nice highway race. I can vid my theory. Me driving both cars back to back i def see where the 30% went. Now the HR now thats a diff story i cant wait to run one of those. I wonder if we can utilize it more or modifiy it to produce more results etc.

 

Yeah I know this. But Wired 24/7 and I have been discussing numbers on the dynos we use.


No. I'm saying for the question asked, it cannot be answered without knowing more precisely what the transmission losses are.
Sure, I could calculate what it is, but it would have to be based on more than one flimsy assumption...

When Nissan advertises 300 HP for the REVUP engine are we to assume the advertised number is accurate?... Just last year everyone would have said yes.
But now the answer is no. The ASE standard just changed.
The revup is rated at 300 and the HR is rated at 306. But when tested on the same machine there is about a 15 HP difference.
And 10 years from now will the ASE standard change again? Who knows.

When you say a stock vehicle produces 250 HP should we assume this is accurate?... Are you referring to a Dynojet?...

From my understanding even dynojets are considered happy dynos by many in the automotive industry, and Mustangs (which dyno even lower most of the time) are considered the more accurate machines.

Emphasis on "most of the time".

So which machine is more accurate? Dynojet or Mustang?...
Even if we could say, then what about the machine to machine repeatability?... These number go allllllll over place. I've seen stock numbers range from ~215 to 255... From this range, what number is the accurate value?

Its useless to try to predict what the transmission losses are. The only people who probably really is Nissan. And they arent saying anything.

So I can't answer the previous question because there is no reliable answer.

I could come up with an answer but I would have to qualify it with a +/- 25 HP tolerance range. And I know people don't like to hear answers like that. That would be a completely useless answer.

The reason I use dynapack is because it has excellent run to run repeatability. It is the most repeatable dyno on the market. And for my application (designing power mods) repeatability is paramount.

 

You are only about 17HP away from the 300 mark with the MREV2, spacer and a tune. I think 300 is possible with the addition of a good exhaust system.

 

Do you have any plans to give us sedan owners(06 and below) any exhaust options or something, so we can gain some power?

 

I dunno about that man... I'm thinking cams is the only way. (not that it's whp anyway)

diminishing returns on that flow optimization ... well, you know how that goes

 

Hey I was tweaking around on the exhaust and made 20HP and 20TQ. Its still a long way from done but at least the potential is there.

 

I own a Z and sedan myslef and will adapt it from the Z to the G once the Z is done.

For me, Its as much fun making HP as it is driving with it.

 

So if 215whp = 292 crank under the new system, then 300whp would equal about 405 crank Hp. If 245whp = 292 crank hp then 300whp would equal 357 crank hp. Thats all I am saying. And it's a ballpark statement. What does the stock Rev Up dyno on the dyno you all are using as a comparision. I thought it was 270ish so that would be about 326 crank hp.

 

The figure Doug Stewart uses for the 6MT is 17%. Of course, that was based on the previous methodologies.

For example, my car dyno'd 242hp peak on a dynojet stock(05 revup sedan). That's ~291hp at the crank; not exactly 298, but definitely close to the revised 293.

 

Could be a little more clear since the Z and the G sedan have a different exhaust and the fact I am not keen on this subject matter. BTW year sedan I have an 03.5 and would like an exhaust works just as well as the spacer does. Thank you.

 

On the Dynapack they typically do about 270 +/- 2 or 3 HP stock.

 

I'll make it for both. But I'll first need to see if the midsection has the same space for resonators and such.

I'll make the most of it that I can. I'm currently going through a range of different diameters and lengths of tubing for testing on the dyno. Finding what works and what doesn't.

 

very nice thank you for all your efforts