Bogging twice?

[anthonysmithr33gtr]

So I picked up my new r33 gtr today from the city, we came back home and decided to take a little tour out through the country. When I was coming up on a stop sign I was doing about 80-90 kph and all the sudden the car felt like it bogged almost into a stall but stopped when I shifted into 4th, then at the stop sign it did it again as I was pulling away(no I didnt almost stall the car :P ). Though it didnt do it again over the next hour of driving it concerns me. I know there is a hole in the exhaust that they need to fix next week, could it be losing enough backpressure from a hole to bog? I also had just filled the car up about an hour prior to this so I was thinking maybe there was also some air in the lines, any suggetions?

[caliber676]

Intermittent faults, there will be many of those my new gtr friend. Back pressure does not concern our cars, the turbochargers are the backpressure

[anthonysmithr33gtr]

Oh I see, any suggestions?

[Skym]

Check TPS setting (also check for error code on ECU), as it's meant to prevent engine going lean, hesitating before accelerating. Also check other things that can cause engine to run lean.

[anthonysmithr33gtr]

Well, Wednesday I will be replacing the spark plugs and the fuel filter, I will also be cleaning out the MAF sensors, hopefully we will see an improvement! I called the dealership and they said it could also be because the car isn't use to running 91 octane gas yet

[Skym]

Stock ECU can adjust to low octane gas via knock maps (also known as low octane maps) if it detect's knock via knock sensors. But if get a bad batch of 91 octane fuel that could be lower than 91 octane (does happen) ECU can't compensate by switching to knock maps. Also fuel goes off after 3 months (I think octane drops), so should drain (or drive until tank is near emtpy), refill fuel tank with fresh gas.

Should run it on 94 (anti knock rating, there's a formula for this) if you can, as that seems to be the equivalent to 98 octane in other countries. I tried on 95 octane (boosted up engine with stock maps) and engine didn't like it. Ran best on 98 octane. They run it on 100 octane in Japan (mentions on sticker that's located on back of fuel flap) with stock engine.