Fulham71

I am running an MY01 With a motec, VF30 turbo uprated fuel pump injectors & APS induction kit

The car is topping out quite low down & not asking for any more fuel I.E. its not getting enough air !

Has anyone else encountered a similar problem & how has it been resolved ?

Is it just a simple question on using ducting to get more air to the APS or is there a restriction further up ?

Or should i change the APS ?

Cheers
Paul

Pete Croney

Your map will be determining how much boost it runs and how far up the rev's it holds boost. The fuel will be matched to the air that the turbo is pulling in.

I'm not sure of the flow rates for the VF30, but would expect your set up should be good for well over 350bhp if Bob is mapping your MoTeC. We are seeing 360 on an ecutek 01 with similar mods.

M0NEY

Whats Bobs email, i want to drop him a line

Fulham71

Cheers Pete
Tsl prepared the car & the MD of Motec mapped it so think its just a case of ducting then remap but has anyone done it ?

Fulham71

Im still stuck please help me !

john banks

Consider the inlet pipe from the APS to the turbo. Also consider whether the turbo you have suits your needs or whether you need something that will flow more. How much power are you looking for?

Fulham71

John I think you could be right about that piping !
Not too worried about the power but would like power all the way to 7000 RPM when it currently runs out lower than that !

john banks

IMHO expect it to plateau by 6000 RPM with UK heads and a turbo as small as a VF30. Be glad that you are making the power there and change up and save your conrods.

dowser

But power at the top end is mostly related to boost, and makes little difference in the on-road, *real*, world. Is it worth the risk? I *make* my customers change gear at 6250 Or am I just being naive?

Richard

dowser

Above 6k, 1 degree of advance can be worth 4ps. Doesn't necessarily mean it's a good solution though

Richard
PS: I should qualify that statement: my only experience relates to the classics...be trying the STi7 though

john banks

Scurries off to find some C-16 and three more degrees

Bob what do you think of NF octane booster specifically from the point of view of using it to get more timing - have you had more power as a result of this?

I am still a bit wary of pushing the top end timing a lot because of the damage potential to UK pistons at 1.5 bar at 7000 RPM.

pat

I would also suspect the map, there's no reason that you can't make decent power with a VF30 on an MY01... to give you an idea of what is possible, I got 321 BHP at 1 bar out of a VF30 on Power Engineering's rollers while playing around with an STi VII... but those heads are somewhat different to the WRX

I'm playing around with a WRX with an MD304 turbo and uprated injectors and fuel pump, full exhaust system and ITG panel filter, and it's flowing quite a lot of air up top Getting up to 290 grammes/sec air, measured about 275 BHP at the wheels at a lowly 1.25 bar... this is with the standard air box and TMIC. It can get 1 bar of boost by 3150 RPM, but the boost control algorithm in the WRX ECU cannot cope with the shaft intertia, so I have to slug it a little, full boost is delayed to about 3400 RPM as a result. A MoTeC on the other had would be able to "catch" it before it overboosts (as would the STi Denso ECUs, and it looks like the MY03 WRX control code may be able to as well).

Cheers,

Pat.

Fulham71

thanks for your replies

Bob Rawle

No disrespect to anyone but I suspect that the timing is pretty conservatively mapped at the top end of the rev band, I used to make peak power at 7000 rpm when using a Motec on my car running a small turbo, circa 340/350 bhp. Advance is crucial in this area.

edited to say that was at 1.2 bar at 7k rpm which is no problem for anything.

Bob

[Edited by Bob Rawle - 2/5/2003 11:00:35 PM]