I'm just wondering, what the power curve is going to look like when I finally get my GReddy kit installed. All it'll be is the kit, fmic, Emanage Ultimate, and a walbro, and 3in turbo-back exhaust (custom true dual) at first. (i.e. no cams, or return kit yet, so no incredibly high boost) So I won't be making a lot of power. But If I'm running, say 6-7psi... where should I see full boost at? Dyno graphs are helpful too.

Thanks

 

https://my350z.com/forum/forced-induction/195430-my-dyno-and-first-impressions.html

 

Thank-you sir

 

Here is mine...

 

did you get the dyno graph which shows how much boost you are making at each rpm?

 

Na i sure didnt...maybe I can give eric a call and see if he can email me that

 

It seems like everyones getting full boost at 3500 rpm, where the tq curve hits.

 

Yea, I was told (and my ears and butt dyno agree) that I start building boost around 2700 and reach max spool around 3500 rpms.

 

Kind of off topic, but I was just noticing how similiar these compare to single turbo setups I've seen. Not trying to start anything, but just noting how little lag there really is...

 

Well, that is one of the things I like about this setup, it has very little lag in my opinion. I am looking at upgrading the turbos (once we max these out with the new built engine) and I keep running into the problem of trying to get more power with minimal increase in my lag time. I am willing to maybe like a max boost at 3750, but I really don't want to go any more then that as it loses its street use in my opinion.
--B

 

I asked, because the idea occured to me that one could use EVO III 16g turbos to decrease lag time ... while still getting about the same amount of power (think the type of turbos in the JWT kit for those who don't know what an EVO III 16g is.

 

there's never any lag if you're in the right gear though right?

 

Right. If you know how to drive in your power band (which is still huge on this car), you will always have instant access to boost.

 

I think he is talking about boost threshold, not lag.

 

I was talking about the fact that EVO III 16Gs should spool up at about 3000-3200rpm and have the same power output on the whole. Within, reason... it might not support 650-700whp. It might support 600-650whp instead, which is fine for me ... because I won't be building my motor. Not for quite sometime anyways.

 

man quite a linear curve after boost builds.

 

I'm sure some disagree, but the only reason I see any benefit for faster spooling is for spirrited daily driving fun or maybe autox because otherwise you're always in the mid to upper rpm range when you're racing in any sort of way. For daily driving thrill where you might drive in the 2000-4500 rpm range, I'm sure faster spooling feels great

it seems like for drag racing with race tires you launch at 3000-5000 rpms which is well into the boost. After that you're in the 4500-redline rpm range depending on what gear you're in. It'll be at 5100 (or higher)-redline in 4th-6th gear depending on how far over 6600 you drive to before shifting

when driving a road course, you're always going to be around 4000-redline so I'm not seeing faster spooling as a benefit. You're usually moving at 20mph or so before exiting the pit area or even doing a warm up lap before you're officially racing

I guess autox might possibly have some benefit for the fast spool since you can sometimes slow way down and might not be able to turn the wheel and downshift fast enough in some situations.

Otherwise spooling up faster seems only useful for fun spirited type of driving vs being in a lower gear at a higher rpm that is definetly in high boost


a TT setup keeps a broader power range when you start getting into higher boost levels than the ST setups, but at lower boost levels like say under 10 psi, the difference isn't as big of a deal

 

I will be using the car on the street only, drag racing it like... once in a blue moon. And the top end of the turbos (as I said before) will be pretty much the same, just spool like 300-500rpms sooner.