Need a remap asap. Or keep off-boost.

Even so I'd get it remapped asap. So best get those other mods added and get JGM to come to you to map it all.

In the meantime I'd use the car as little as is possible.

 

If you want to believe you have 320 bhp as you originally said from a set of 380cc injectors at O/E fuel pressure that is fine by me and most others on here I expect but it would be a great pity if the expectations of someone with little knowledge was that they could produce 320 bhp without a set of 440cc injectors and their modification route was influenced accordingly.
Using Delta Dash, I do not doubt your mapper was making a genuine attempt to give you an indication of power and it sounds like your car and mods are a particularly good example with the 380cc injectors being the restriction as you have described. How much more will you get from your VF28 on a set of bigger injectors? On the same piece of road with the same weather conditions and input figures then a Delta Dash comparison would be useful.
No matter how very well known your mapper might be he will know that 380cc injectors reach 100% duty cycle around 290 bhp, perhaps a small margin more or less running V-Power and standard fuel pressure.
Delta Dash is a very useful tool for comparing results on the same car throughout its modification trail but there are many factors that influence the result. How accurate is the weight of the car input information. Just the amount of fuel in the tank or the driver's weight makes a noticable difference. Wind direction, temperature, road inclination and so on.
If you do fit bigger injectors at some time in the future it would be interesting to have the feedback.
Comparing your car's performance with a WR1 does not really tell us very much. For a start, gearing will have a lot to do with the accelleration of the respective vehicles and just because my car leaves an Intercity 225 for dead on the Dunbar Bypass does not mean he has less than 422 bhp.

 

I will just add a bit about your gearbox. It will most certainly be one of the last TY752 VN s
These have weaker casing( fewer bolts) and flex more.

So when you come to replace the box dont replace like for like but upgrade to a TY754 VN as found on MY99/00 classics. These have a stronger casing and is far more likely to reliably handle 300hp and the assocaited torque.

If you intend to hike the power even more, then perhaps invest in a different upgrade....but you are then getting into big bucks.

Steve

 

just reread this and realise he's running 380's not 440's, my bad lol

 

All points taking my man. I agree that over 300bhp on 380's is hard to see. Power runs were on straight road with slight incline one way and obviously not the other. Guessing weights were pretty close, as it's a standard newage, standard wheels/tyres, half tank of fuel and I was asked my rough weight also. Mapped using v-power also. Three runs were all within a few bhp of each other, think the lowest was 312 and highest was 318.

Any way, car pulls alot lot stronger than with a mapped td04 and also holds boost right up to 6k. Max boost is 22psi.

No comparison to be had between fitting bigger injectors on my current spec. Got a set of 650's + fpr to go in, along with a forged ej257 and a host of other goodies next month hopefully.

 

As yours is a newage, your injectors are 420cc. These will just hit that power figure... just if you run it on the leaner side.

Delta dash is all very well (if you know the exact weight, have a completely flatroad, no wind etc) but if the road is not flat then IMO the results are completely flawed as far as showing a power figure.

They could still be useful if the same road is used for before and after figure to show general improvements though.


if the lowest was 312 and highest 318 - how do you get 320?

 

would have thought a fpr would be advisable when running 300 in anycase?

 

There seems to be a general misconception that when tuning a Subaru you need an FPR. These cars are already fitted with an FPR. If it is in good order then the O/E item will do the job satisfactorily. The case for an aftermarket FPR is to have an adjustable facility to extend the range of the injectors beyond their normally intended power band, if they are already very close to 100% duty cycle. A better solution is to move to bigger fuel injectors so you can achieve your power goal at reasonable duty cycle, 85% for instance.
I see lots of cars with aftermarket FPRs that are unnecessary. The money spent could have been put to better use elsewhere or gone a long way to a set of bigger injectors thus providing headroom for further modifications.