R33 Gtst Backfiring, Idle Drop Etc

[lincellusion]

Gday guys. Trying to sort out all this backfiring with my r33 gtst. Its a 95 series 1. Mods are a pod filter, previous owner added a turbosmart bleed valve, and apparently blew the stock turbo so added an upgraded (or high flowed, forgot what he said) turbo. Has a blitz bov on the piping, but its disconnected (no vac line) and was told its got a blocking plate on it which i may double check tomorrow, but the cars still running the stock recirc bov. The problems i am getting is the car sometimes backfires and can shoot flames after hitting boost and tapping the accelerator etc, and sometimes when i hit the throttle and come on boost it has two or three pops and loses power during those pops, like some sort of misfire. Also like many other people, the revs SOMETIMES drops below 500 or so then creep back up. Any ideas? Crappy plugs/ coils etc? Cheers. Ps the factory boost gauge says I'm doing around 5 pounds but the car pulls hard, would the gauge be reading correctly?cheers.

[dontyellpl0x]

Factory gauge reads in mmHg not psi. 7 mmHg is roughly 1 bar.

So the turbo has been done but still running stock ecu?

[scotty nm35]

Ditch the BOV and stick a stock one back on. Make sure it is plumbed back to the intake. Should solve the backfiring anyway.

Then get a tune.

[lincellusion]

ohh k lol thought it was psi ;P i feel dumb haha anyway. I am pretty sure still stock ecu, I think the guys basically blown the stock turbo, so went to just jap and told them to give him something better to bolt on! the blitx bov isnt doing anything atm and the stock bov is the operational bov and properly plumbed so thats sorted. and yea hopefully soon will get a tune, any suggestions on a piggyback etc? power fc? ive heard mixed things on many piggybacks to use, whats got the best proven results on my car (r33 gtst)? thanks alot guys!

[GTRPSI]

Power fc do the job, been around for years and are cheap S/H atm.

Haltec are better if doing serious upgrades but are priced more.

[lincellusion]

basically i would be happy hitting around 300-350rwkw in the future, would a power fc do the job? I saw those nistune boards but am unsure if they can get that sort of power safely?

[GTSBoy]

PowerFC is the only easy/cheap way to do what you want. Nistune is more than capable of handling that power level, but you can't put a Nistune board into a crappy R33 ECU - you have to find a Z32 or R32 ECU and then there are small problems you have to work around. Not worth the pain if you're not already up to speed with it.

So, PowerFC it is.

And, FWIW, don't drive it around on higher than 10 psi with the stock ECU. Bad shit will happen.

[lincellusion]

ok cool thx. so if the boost guage is reading 5mhgh or whatever it is, is that ok? or should i give the bleed valve a few clicks lower for safety? whats a good price a power fc can be picked up for? i want to find one at a good price so i can then take it to a tuner to install and tune etc. cheers for all the help!

[GTSBoy]

500 mmHg is about the maximum boost you'd want to run. It's just under 10 psi.

By the way, if your car is auto, I think you had best look at otehr ECUs than PowerFC too. They don't play well.

[lincellusion]

nah 5spd manual man!

[MBS206]

  On 01/01/2014 at 4:35 AM, GTSBoy said:

PowerFC is the only easy/cheap way to do what you want. Nistune is more than capable of handling that power level, but you can't put a Nistune board into a crappy R33 ECU - you have to find a Z32 or R32 ECU and then there are small problems you have to work around. Not worth the pain if you're not already up to speed with it.

So, PowerFC it is.

And, FWIW, don't drive it around on higher than 10 psi with the stock ECU. Bad shit will happen.

I presonally wouldn't touch a PowerFC, they may be cheap, but they're cheap for a reason. People want ECUs that can offer better features, such as doing something if the engine knocks.

[lincellusion]

This is why i dont know if i should get haltech etc. because the thing i was saying about fc's is thy i was told they are advertised as an ecu etc but are missing many features you need/want in an ecu!

[GTSBoy]

The reality is that many people want a lot of things in an ECU and then simply don't make use of them anyway.

[lincellusion]

true. well maybe for my needs an fc is all thats needed. also, seeing that only real performance mods atm are bigger turbo and bleed valve (will be replaced with ebc soon) when i get an ecu and tune, whats a good boost/ power I can sit at with stock internals, injectors etc? thx guys!

[hypergear]

The problem mentioned is not very related to a ECU, Such as the back firing, the down revving under throttle and etc. Those are more related to the differences in the volume of air that the engine had to what the AFM might have sensed.

If aftermarket ecu is on the list, I recommend Adaptronic Plug in R33 ECUs. Plenty of functions and cheaper then most of other options around.