hmhaga

How will the VF29 perform using a MY98 PPP ECU? Will it cause massive lag without a remap? Have a Walbro 255 and the usual MBC, H&S downpipe, induction etc. Stock 380 ccm injectors though.

I've been reading through some threads, and understand that the 380 ccm injectors is a limiting factor - causing leanout at high RPMs and possibly detonation. My plan is to run 1.2 bar mid range, then reduce to 1 bar above 5500 rpm. I have access to a LM1 Wideband meter, so I can verify the AFR at different loads/boost pressures.

Is it perhaps safer to use the stock MY98 ecu, as this will run less aggressive timing?

This is a temporary solution, as I have plans for a 2.5 conversion. In other words not a catastrophy if my engine dies, but it should at least survive the forthcoming season. I plan to reuse my heads for the conversion though, do they usually survive e.g. a piston melt down? If not, that would be somewhat...bad.

I soon have Whiteline's complete parts catalog on my car, it is extremely annoying that the more powerful pass me on the straights - only to limit my speed in the twisties (track days, not public roads).

Gear Head

iTrader: (2)

Well you are going to need an aftermarket ecu when you fit the 2.5, so why not buy, fit and map one now? I don't think your engine would last very long without one.

hmhaga

Edit: So much for that plan, Apexi Power FC and 550 ccm injectors on its way from Nengun. All reusable for the 2.5

john banks

I once had a standard ECU running 2.5, APS induction, 550cc injectors.

The APS induction did a good job of rescaling the MAF for the injectors. The fact there was a 2.5 didn't really make any appreciable difference to the fuelling, and it retarded the ignition timing for the same boost level, which is just what the 2.5 needs.

Lee_1075

iTrader: (1)

Whats the difference between a PPP ECU and a normal MY98 ECU??. I too have a MY98 running a VF29 at 1.2 bar peak 1.1 hold, a DP, STI I/C and Walbro pump is also fitted using the standard ECU. According to my AFR the car runs actually fat at high speeds.