The thing I notice (something I noticed driving as well) is how flat the torque is until 6,000 RPM's, where it starts to fall off. Whenever a new intake manifold is released that should really help shift the power up to higher revs (where you stay on a track) and give the car that much more power...

 

I agree after like 6k, the car does not impress me too much. Feels like it runs out of steam up top. I normally dont even take it that high. No real need. but when I do, its kinda bleh.
Below 6K though the thing feels pretty damn good.

What are all the mods again? I think its pretty safe to say the HR takes very well to mods.

 

Could be the cams aren't breathing that well up top too. IIRC the cam lift/duration for the HR is the same as the Rev-Up VQ, except 4 degrees advanced. No way to know for sure yet.

TK

 

Right, but the 3.7HR has a longer runner length on the intake manifold which would account for more top end. I'd expect a similar manifold on the 3.5 would move some power. The car in no way falls over, it just doesn't have quite the umph. Still faster to redline it than to shortshift, and flat torque curve is great for low-speed cornering/exits.

 

did you guys lean out after installing intakes or test pipes?

 

intakes made my car dirty lean. Takin it out. Well the A/F chart explains it. That is with test pipes and exhaust.

 

Hey Jon,

Here is the Overlay thread i started with our two cars.

Man that engine pulls hard up top

https://my350z.com/forum/engine-and-drivetrain/328813-dyno-overlay-of-a-07-and-03-same-day-same-dyno.html

Nice numbers

Todd

 

if u want more power up top, then get a big (2.75+) diameter true dual exhaust

here is a dyno of a stock run, w/ greddy evo TT (2.75" TD), and w/ greddy evo TT and test pipes:

https://my350z.com/forum/showpost.ph...1&postcount=51

notice that the exhaust started picking up power a hair under 6k being equal every where else to stock, then the added test pipes added power everywhere else. all of the other exhausts *that i've seen* (not every other exhaust in the world) pick up good power over stock from the low end up to about 6k, then they more or less match the stock power from 6k to redline. so from my observation, if u want power up top, get a big exhaust, if u want power low to mid, without losing what u already have up top, get a normal sized exhaust.

if u wanna get really wild, u can put a cut out valve on ur exhaust and have it open at 5.5-6k rpm, and get a normal size exhaust. then u'll have the best of both worlds. but i imagine this would be a pain to set up

 

Nice numbers, sort of off topic, but are the MAF housing a different diameter causing the A/F leaning out?

 

What shop? I plan on dynoing at Dynolab, in Marietta.

Edit: NM, I see it was in Oxford. I may go down there, as it's closer.

 

Very nice numbers!
I may have to throw mine on a Dyno once I am done putting the mods on it once it is broken in.
Very inspiring....
I would love to see what you run in 1/4 with those Gears
That thing must FLY

 

After seeing your A/F I'm taking my intakes out until some tuning options are available...

 

I thought longer runners would account for more tq on the intake manifold?? Iam a bit lost

 

I could be making a mistake here.

Thinking about it more logically, a longer runner resonates at a lower frequency (given same diameter) so it would flow better at a lower RPM. So maybe I've had it backwards in my head this whole time .

I need to read up on plenum design a lot more.

 

STD will yield higher numbers then sae

I'm looking for about 290 whp sae correected when I get test pipes soon

 

When it comes to runners you have to think in 3 dimensions. One car may have "longer" runners physically, but also have to take into account the actual cross section of the runner, and the internal area of the manifold. In theory, longer runners will provide more torque down low compared to shorter runners, if the internal area, or volume, of the 2 runner types including their collectors is the same.

TK

 

Ok, nice explanation. I never stop learning on this site

 

HAhaha, you and me both man. I know theres allot to it, but once you start grasping the concepts it gets very intresting

 

damn damn, I wanna get my dynoed soon. I'm trying to wait on the reflash though cause I wanna see what I'm making all said and done and see the a/f ratio then. I'm gonna leave the cat's (I think) but then I'll have the dual popchargers and the AAM 3" single, AAM y pipe and reflash

 

I think thats the basics, I could be wrong about a few points. I'm not 100% sure if the volume of the collector has to be included too. It might just be the cross sectional area of the runners needing to be equal.

TK