paulwright@wkdclub.co.uk

Hi all please help I have recently bought a 1994 Rx& pretty much standard. Don't know much history about the car.

When I accelerate hard in the higher revs (approx 5500) it sounds like the vehicle is hitting a rev limiter how ever the power drops for a split second and then the power kicks back in ?

I have spoke to a couple of people and several things have been suggested new plugs and HT leads although i'm skeptical . Another thought has been that the fuel isn't burning or quick enough ie to much air getting in or lack of fuel pressure please help cheers

ps could the level of octane in the fuel efffect this - what is the highest u can get in this country

obie81

Could need re mappin dude, sounds like theres a gap between turbos kickin in

NissanConvert

iTrader: (1)

That's the turbo cross-over from single to twin. It's normal, however your symptoms are strange. Mods?

adam c

iTrader: (2)

If your car has been modified, and you are running a stock ecu., you are likely overboosting and hitting fuel cut. Reduce boost to 10 psi maximum.

Timmy06

I think im having the same problem...My engine has less than 200 miles on it and my mods a apexi cold air intakes, midpipe, downpipe, and a megan racing exhaust....i will probably be getting a highflow cat here soon...and after 500 miles after the engine is broken in, im installing my PFC and im getting it mapped....any suggestions or do you think ill be fine after I get the cat and the PFC installed?

fendamonky

iTrader: (6)

I dont think of myself as an expert or anything... but Timmy, you should DEFINITELY have the PFC installed, asap. If nothing else the Midpipe is going to free up your system way too much for the stock ecu to handle. If you want to keep the MP in then check into fuel mods, otherwise I would get rid of it (unless you enjoy rebuilds) until the rest of your system can handle that much flow. No if's, and's, or but's though... you should have a PFC in last week, especially since you are running a free flow system!! You may also want to run a search (if you haven't already done so) on how to best break in your engine..

NissanConvert

iTrader: (1)

The stock ecu is only good up to 10psi. If you're running higher than that your engine is on borrowed time. If you have a downpipe and a midpipe you will be boosting over 10psi. The rotary is not friendly with detonation, you can't overboost it and get away with it. If you get one real detonation and it survives consider yourself lucky.

High flow cat, aftermarket boost gauge, power fc

Timmy06

Should I get a boost controller after I instal my PFC or will i be fine?

pinkrx7

iTrader: (2)

You shouldn't drive straight pipe exhaust systems without making sure your boost is at 10psi or under. OR unless your car has been tune via standalone (PFC) for higher boost.

Don't drive until you're sure that the FD isn't running less than 10 lbs

rynberg

Cannot troubleshoot without boost readings. Get a boost gauge and a friend, and report back to us with the boost pattern.

Well, you are well on your way to not making it to 500 miles. Do not drive the car with the midpipe in. You shouldn't be boosting that hard or going over 4k rpm on a fresh engine anyway! The PFC uses the stock solenoids to control boost, so can do an OK job if they are in good shape, but an aftermarket boost controller like the Profec Type-S is recommended. Please do some research before you blow your motor.

Timmy06

So whats really the big difference between a PFC and a boost controller...cant you control the boost the pfc? Sorry if this sounds like a total newb question...

rynberg

Did you not read what I posted above?

The PFC is a full standalone engine control computer, a boost controller just controls boost. Like I said above, you need to stop doing anything to your car until you learn what is going on. I suggest you read through the FAQ thread and the archived threads.