2nd5un

Thanks guys for the replies. It appears the reason for the engine failure was...... a dirty airflow meter!!! The voltage wasn't correct.

It was changed about 2 years ago. It should still be good

I'm not sure of the duty cycle etc. I have asked for these details. The ecu is factory so I'm not sure the tuner can get that information. I have talked to another local tuner who seem really helpful and I'm going to take the car in there and see if they can sort it. It could just be down to the pump not supplying enough pressure up top or fuel filter is clogged up, hopefully these other guys will be more helpful and sort it. Cheers for the replies I'll let ya know what the outcome is.

The fuel pump is a replacement one, I thinks it's universal but not a Walbro just a generic $60 one. the tuner said it's keeping up with demand just. And the reg is just the factory one. In his report he says the lean situation is consistent with a substandard fuelling system but he's basically put it down to maxed injectors and says the lean top end is not down to the fuel pump.

Thanks for the reply everyone. I have had a report from the tuner. In his analysis he claims the injectors may be maxed out @190 wkw, they are 440cc yellows and have been flow tested. Does anyone know whether this is likely? afr under boost is lambda .7 (rich) up until 6100rpm where it runs lean .92 lambda by 7500 rpm. What do you guys make of this do you have any ideas? Once again the only mods are turbo back exhaust and pod filter. The tuner doesn't actually know what's causing this, his "possibilities" are: -injectors maxed -rom file in ecu edited -20 year old ecu failing

Yes sorry it probably is 75 I haven't actually pulled the kick plate off to check. As for the tuner I'd rather not say, I have nothing against the tuner, I just wish to seek others advise. As far as the pistons go they should be the same as the factory ones, and the head gaskets I'm unsure, I only have the part numbers, they were picked out of a book at the engine rebuilders. I'm assuming your implying higher compression then factory could be the cause of the power level and det

Hi guys, have an issue with my 98 v4 sti type r. I have had the motor rebuilt for a second time in 2500km because it's detonating. The car is factory execpt for an air filter and turbo back exhaust which have been on the car for around 4 years. The car has just been dynoed and was detonating but surprisingly made 188kw which is quite high, around 30kw more than expected. The ecu should be a 6s and has an orange afm and yellow 440cc injectors so all factory, also runs factory 1.1 bar boost on the vf24. The tuner recommends de-tuning the factory ecu to stop the detonation but I'm sceptical this is the underlying issue. can anyone please give me some insight into what might cause my car to run so much power or whether this is a normal power level or even why it's detonating now after the rebuild but seemed fine for the last 90.000km?