Can't and don't want to slag off Mocom, but is does appear to be a poor increase. I've just booked it in to Powerstation for tomorrow for a "power run". No doubt their figure will be totally different to

Anybody know my question about the headers???

 

Powerstation are meant to be quite conservative... so just don't be disappointed if it's below 300bhp..

 

after market headers and particularly up-pipe may well be too big - this would hurt spool up of the turbo and that would affect torque right the way up the rev range and ultimately BHP - that would be my guess. They dont generally need to be changed until over 400bhp at least with the likes of Andy F runnign OE headers on his Spec C even at a lot more than that.

Delta Dash Road Dyno is the same for all users - start at low revs (1250 rpm iirc) and take it up on WOT to the redline. This will produce a more acurate guestimate than any dyno as it is taken in real world conditions.

Sure you could hop around from dyno to dyno to chase figures but what would it achieve - some read high than others, some measure coast down losses, some guess using a factor, some are just made up full stop depending on what the operator wants you to see or buy from them?

 

To be fair I chose to map it conservatively as it required a little over 3ltrs of oil to bring it up to level and there was no way of knowing if any damage had/has been caused whilst running with just 1.5ltrs and I didn't want to get the blame for a lost bearing or two.

As far as the induction side goes I saw a 28bhp increase from an STi today changing the OE airbox to a RCMS K&N induction.

 

ZAK DONT TELL ME THAT!!!!!!!!!!!!!!! Just paid for the bleedin holiday to Florida

 

I can totally agree with this comment as it was my car

it feels like a different car, just keeps pulling

Nice one Zak

 

Whats the sound of the RCM Induction kit like ???

 

Thanks for that
So if i went back to my original headers would i need to have another re-map? Also how would replacing the original headers effect the fueling?.
Cheers
Jamie

 

Sounds V nice

 

Yes

Not sure how it would affect fuelling but it would affect spool up, engine loads and boost.

Have a chat with zak

 

Std airbox on the 01 onwards cars is not an issue up to mid 300's. I have ran 400+ through it but it was starting to cause a restriction at that.
Beware of fitting induction kits too early as this can cause compressor surge and this will limit midrange torque.
Shaun (webby) documents this well in his thread, up to 350bhp and similar torque on his JDM was on the OE airbox, I think he got another few bhp with an induction but surge was an issue.

Andy

 

You can still have power off the line, you just need to launch it harder

Have you got a graph of the power / torque by any chance?

 

Thanks all

As for graph, not yet, Zak said he will email it to me.

Going on the rolling road at 11.00 at Power Station. I appreciate they all give different readings and the road is better but i just want to compare it to the road reading Zak took for me.

 

Well,

what sort of figures did you get from the rollers?

 

Zak's technical stuff is very accurate as figures were within 2-3 BHP of Zaks 305 maximum reading.

 

Not bad with the IAM running at 8 on the rollers.

 

Any ideas as to why it dropped? .... the normal heat issues with dynos?

That must have been robbing it of loads of power.

 

Are we finding out the JDM is not as straightforward as the UK to tune

Andy

 

It is due to be sorted, very soon

 

Why couldnt it be done at 16???

 

I may be asking a stupid question... but:

Is the standard car not a 265BHP car at the Flywheel? How can your figure (after mods and remap) be 250BHP at the Flywheel?

Surely its closer to 250BHP at the wheels, meaning somewhere around 320-330BHP at the Fly?

Im jus confused how ur remap has apparently given you less power than the standard STi setup gave you?

 

Dare I say it Andy but I do believe I may have more experience than even you with the JDM model

 

oooohhh fighting talk

 

yes he made a mistake - he meant to say at the Wheels

 

One point to Zak i fear

1

Your serve Andy

 

If you have been mapping 10-15 Imprezas EVERY week, full time for the last 4 years and owned a JDM all that time yourself to experiment on..... then perhaps you would have.

I do however know when you started dabbling in open source mapping and that you were asking some very basic questions not so very long ago.

Andy

 

OUCH!!

I wouldn't stand for that Zak

 

lol the one who wins this fight, is the one I will go to if I go down that route lol..

Just kiddin. Always interesting to read a decent technical thread

 

Surprised Zak stood for that!!!

 

No-one can win discussions like this on an internet forum.

A slanging match will do no-one any good.