.....or at least that's what my Scangauge II read yesterday on a spirited pull in 4th, and that wasn't with the pedal to the floor.

That's not too bad, and I can be satisfied with that.

I am pretty sure that the code entered into the xgauge function set of the scangauge only reads HP at the crank, so my WHP will obviously be less, but it gives me a pretty good idea of what I've got, because up until now, I just never knew.

And a consistant 25mpg is pretty damn good as well.

It gives you a pretty guessy guess of what you've got.
But, if it proves to spit out consistent numbers, you could certainly use that to keep an eye on the tune and see what works (or doesn't) as you mod.

What are your power mods, anyhow? What boost are you running?
I wanna know what that extra 70HP is made out of

I got 274 on the one occasion, 263 20sec later, and 264 a few min later. I can accept that it's not going to be as accurate as a dyno, but still, it's kinda nice to have a rough idea.
This is based on 15 psi with a FPBigT28, Hahn SMIC, and the usual supporting intake mods.
Exhaust is a full 3" turbo back.
Fuel pump is an upgraded unit with a rewire, but the injectors are stock.

The Profec B SPec II does a great job at letting me tweak and adjust the boost, but it takes some fiddling because there are a few variables to consider.
I could probably stand to up the boost a little more, but my DSM guru here advised against it, because the BigT28 is huffing more air than the stock T25, and it might get ugly the closer I get to the dreaded 18psi "limit" of the stock fuel set up.

I have hit fuel cut before, and it scared the pee pee out of me, which is why I immediately acquired the Profec, because it makes sure that if you a limit, then it will not go past it.

I wish I had the guts to really stomp on it......but as much as I love this car, I don't trust it as far as I can throw it.

Nice, Dan. You're definitely punishing those 450s!

I'm sure you'll get a kick out of this...

http://www.z31.com/software/injector.pl
Injector size: 450 cc/min injectors(42.9 lbs/hour)
Number of injectors: 4
BSFC: 0.65
Duty cycle: 1 (100%)
This combination will supply fuel for 263 horsepower.

So, maybe yours is more efficient than the average turbo car (BSFC < 0.65).
Or the variables & calculations in the Scangauge are slightly off.
Or you really are at 100% IDC

In any case, this should tell you that it's time for some bigger boost gravy nipples &#169;

I say don't run more boost, I'm running t25 at 17-18psi with stock injectors and at the top end the IDC is at 91%. I bet you are at 100% at 15psi on the t28.

Rob........don't rain on my parade, man.....if the scan gauge gizmo sez I have 260 hp....then let me have that thought LOL.

Paul, thanks for the info......that's very good to know, because I don't have a datalogger.
If anything, I should perhaps turn the boost down to err on the side of conservatism.

Not a cloud in the sky, Dan!
I was just trying to validate the number and at the same time make this thing more useful for you.

If you could log and verify your IDC, and find that it is hitting 100%, (assuming there are no boost leaks) that would be a great validation of your Scangauge.
It'll also be proof that you need to dial the boost back, or get more fuel support. A very good thing to know, sooner than too late!

If the IDC is low, lets just assume that the Scangauge is correct and that you have a very efficient machine

Dan, if you can do a 60-90mph 3rd gear run and we'll compare results with my t25.

60-90 in how many steamboats?

I got it down in 5.4sec..on the t25 car

Hmmm

The unfortunate thing is that even my my DSM guru here doesn't have a datalogger......go figure.

The only thing I have in my car gauge wise, is my A/F meter, which always goes 2 bars in to the green when I go heavy on the foot.
Again, that's probably a reeeeeeally rough indication of how things are running and should not be taken as the only form of measurement (wait......why did I put that gauge in again?)

I'd be curious to know what my stock IDC is.......it's too bad the scangauge doesn't read that.....but it DOES show injector timing.....if that helps..(I believe it shows a percentage)
is there anything I can glean from this that would help me?

In any case, I dialed the boost down a little tonight just to be safe.

Looks like ignition timing (there's no mention of injector in the Scangauge manual).

Just for some thinking Dan, when I had the evoIII (pretty similar to your t28) & ran it a couple weeks on the stock fuel system with DSMLink, I hit a max IDC of 107%. This was right around 15.5-16 psi, IIRC. The thing to note is that even though IDC was over the possible 100%, the car still didn't knock at these levels. I would imagine this is due to the fact the cars are tuned to run so rich (~9.5 to 1) from factory, & that even though I was out of fuel, it still didn't cause a lean condition. Now I would imagine your probably fine running at 15 psi max but I defently wouldn't try to push it without some means of logging.

On a side note you need to get a fuel system in there in & turn the boost till the 20-22psi range, I'm sure you'll be very happy with the results

Cool.

Thanks Daren! I appreciate the info.

As for going beyond 18psi......

I have thought about upgrading the injectors and getting a S-AFC so go with it, (or the equivalent) but that's getting into territory I had never planned to get in to. (my planned path was to simply make use of what came with the car in stock form)
Realistically, I don't even use all the power I have now (damn traffic)
Consequently, now that I finally have the Evo IX Recaros in my car and everything from belts to brakes have been freshened up, I am finally content with this car.