I've seen more than one person produce logs showing over 400g/s then fail to break 300whp at the Dyno so I wouldn't be putting too much faith in a g/s log without at least one dyno to correlate it to .
And with the manifold - a older repaired one may actually be a better bet than a new one .

 

+1.

 

It all goes back to dialing in the MAF very precisely...

 

It's not maf calibration that is the major issue - it's boost/vac leakage ....

 

I've got a fully ready to go turbo setup..New intercooler (30x10x3), TiAL bov, new couplers, fuel pump, BHR ignition, MS intake and accessport, and an engine with 50 miles on it, and the vertex kit being put on in the body shop now.

I want to do this upgrade, but I'm not sure if I can justify the expense of the turbo as well as buying new injectors if the gains will be minimal.

I guess the only pre-req mod I don't have is water/methanol, which would definitely happen before an upgraded turbo in any sense. The best part is I've got a good buddy who is a tuner at a local shop and told me whenever I get my car back and ready to go to bring it down to the Dyno on a Sunday and we'll play with it all day.

I've been on the fence for a while now

 

hope your buddy actually tunes rotary engines

 

you should really consider sending your injectors and having the caps removed most of the turbo owners go this route including myself
http://injector-rehab.com/

Prices are great

 

please explain how one can get over 400 g/s and not break 300 whp with the MAF being dialed in perfectly....

 

simple - If you have a boost leak the air that leaks out still went past the maf so has been measured but never makes it to the engine . This leads to a rich condition.
Reverse is true for a vac. leak after the maf but before the turbo . Extra air enters the system that has not been measured therefore a lean condition can result .

 

I understand what you are saying. But I wouldn't put necessarily the MAF being dialed in as not being a major issue-because if its not dialed in correctly...with a turboed application IT WILL GIVE YOU A HIGHER G/S reading.

 

It's a matter of degrees . Sure an uncalibrated maf is an issue and can hamper tuning significantly . But in all probability if you are seeing 400g/s maf but only 290whp then it's a boost leak . You would have to make one huge ***** up to make that much of an error with calibration .

 

I don't even know what you guys are fighting about.... I tuned the damn thing, and I'm telling you there is a huge boost leak and therefore the MAF scale was off (actually reading low since I was trying to back fuel out of it). In vacuum it was ok, we got the variation down to almost zero.

But the scale went haywire in boost (for obvious reasons), so I ended up scaling the P2 injector to get AFR's in line (although rich). At the end of the day, tuning a car with a boost leak is a big no-no; and I feel bad for not having more time to fully inspect the car while I was there the day prior.

 

I am 100% sure that when I made 290whp my g/s were NOT over 400. So I am a bit confused if you think I am referring to my car when I am saying that the MAF needs to be dialed in correctly. I am not saying in no way shape or form that I didnt have a boost leak because I did and when I fixed it I know that I had a 330whp car...based off my know g/s=whp at the dyno with Kane.

 

jcab when is your car going to be back up and running to make some dyno runs?

 

I was talking in general terms only - not your car specifically (although I did reference 290whp to make it relevant for you) . You asked me a question and I was just trying to answer it as best I could .

 

330 whp sounds very nice to me. I would love to see the full dyno results with torque curve.

Well, I will definitely be buying the Greddy from RX7store and having them do the install. I'm sure by the time I'm ready to do a turbo upgrade there will be more data available on the BNR.

 

to be honest, my car has literally been sitting in my parking garage since Jan of this year... I am just having too much fun making easy power with my other car. Although, here pretty soon I think I will have the engine looked at in detail then decide whether or not to keep it stock or just flat out sell the darn car.

 

but remember those are only people who have fooled themselves into thinking they can tune, or someone else has fooled them. known air + known fuel + spark = known energy released

 

True - unfortunately those who tout the 'flow is king' paradigm often forget that boost leaks and calibration errors make the known air part of that equation a lottery for many setups .
Which is partly why I kept the pressure vs flow argument going ...

 

we weren't fighting - at least I wasn't .And we weren't talking about JCabs car specifically either so

 

 

OSHI!!!!

 

oh noes it's the "saudering iron"

 

I need to find a good picture of Christopher Walken for this skit....HAHA

 

if you have a boost leak, you shouldnt be on the dyno. if it is small and located in a way that you couldnt know about it, well thats just life. But if you have a leak that big, you have no business being on the dyno, or driving the car, or probably owning it if you dyno it like that