Jump to content
SAU Community

Recommended Posts

hi everyone.. sorry if theres already a convo about this did a quick search but didnt find something that matched my problem

anyways

i got an r33 pretty stock apart from front mount, 300zx air flow meter, pod filter. and exhaust..

got a bit of a problem with the boost..

when drive it with the foot the the floor at about 3000-3500 rpm the car starts popping and backfiring badly the power just drops

but if i'm in 2nd and i hold the throttle about half way so the stock boost gauge is just over the 0 mark it runs smoothly to the red line then when i shift to 3rd have to hold the boost gauge on the 0 mark for it to run smoothly and so on 4th and 5th..

is this a fuel air ratio problem or spark plugs or fuel pump problem any ideas????

thanks

Link to comment
https://www.sau.com.au/forums/topic/236662-r33-gtst-boost-problem-help/
Share on other sites

Z32 Air flow meter wont work with a standard ECU

im not sure what ecu it has i havent looked.. its how i got the car all i did was put the front mount on.

got the car from an auction.

ive checked the intercooler pipeing and no leaks

sounds like its over boosting, near 7 on the stock guage when flat stick?

when i flat it out it pops like hell and the boost guage trys to go ova 7 but obviously cant cause 7 is the highest it can go... i was thinking of connecting a proper gauge so i can see how much its actualy running??

but if its running heaps of boost shouldnt the car pump an equal amount of fuel in order for the ratio to be good??

cause by not holding it flat and only letting in a bit of air and its not poping duznt that mean that the air and fuel is at the right mixture?

when i flat it out it pops like hell and the boost guage trys to go ova 7 but obviously cant cause 7 is the highest it can go... i was thinking of connecting a proper gauge so i can see how much its actualy running??

but if its running heaps of boost shouldnt the car pump an equal amount of fuel in order for the ratio to be good??

cause by not holding it flat and only letting in a bit of air and its not poping duznt that mean that the air and fuel is at the right mixture?

7mm/hg is 14psi

SO

airflow protection - some call it boost cut.

rather savage usually, drop the boost down to about 11psi and you should be sorted. if the pod is boxed, then check the filter is still in place.

partial throttle keeps the boost down so this R&R wont happen

chris

sounds about right to me from what i have read, yeah i never like pushing anything past the point i can moitor it, boost gauge not a bad idea either mate, if like me you dont wanna spend big $$$ autometer work -+ 1psi

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • Yeop... binned it   This will be a summary will not many pics atm and cbf  Fixed the samsonas - it was totally munched Put a new precision 7675 T4 on with proper split pulse mani Got to Sydney to get to car - drove to canberra to get racecar - drive back to sydney that night Next day all day at Plasmaman putting on new clamps cleaning some things up and adding another large engine oil cooler sitting at the rear above diffuser to keep things cooler Next day - Tuesday - on Dyno - killer wikid awesome pumped out really good numbers - more mid range and on lower boost levels Wednesday - first prac - all day again getting the suspension right - had to borrow front suspension again - out do a lap come in - out do a lap - in - what i had just couldnt handle the load at the more consistent higher speeds - got a lap in at the end of the day that was pretty reasonable  Put it this way that lap wouldve had me in 4th in Pro am for the whole event - with only 700 hp and used tyres Thurs first official prac day - lap out warm up - with above setting and 80% effort took corners 1,2,3 and into 4 car felt awesome -  rear came around out of nowhere bang into the wall near front on at whatever 140 kmph Done, over, gone Just one of those how did that happen apparently as all indications show nothing out of the ordinary Got to spend the rest of the time at the event like I hadnt done before - was actually Ok mainly as I had my family and my boy is 9 and got treated like a rockstar Long trip home, lost a trailer wheel in nowhere land, X5 airbag suspension gave up half way across nullabour and rode on bumps stops (its now completely fine) had to do a 19 hr drive day on day 3 as accommodation got screwed up so just had to keep driving till found a town with some Now to reassess - there is no easy fix there is no i'll just order that part and get it sent - we'll have a talk to people see what can happen and what the go is but at minimum its rebuild from scratch struts forward and alot of time effort and $ should and if I return and if but maybe/ when  I have the cage tied into the front strut towers - if I didnt have that things couldnt been worse you can say its just a front end but if you know what goes into these cars... you'll know what that actually means in reality   Car was very fast. Disappointing we just didnt get to show it     Apparently this is motorsport !  
    • Thanks, will do that.  Thankfully they still feel great.
    • Yeah man, absolutely. You can try pushing me all the way in swapping the R34 for an E9x M3 
    • It's almost certainly going to be some amount of pads compound transfer onto the rotors. It will probably go away after you've run them for a bit. If not, pull it all out, lightly sand the rotors, scuff the pads, and rebed.
    • no one recommending speedtek gearsets?   i'm in the same boat as Cosline but rwd, I am holding boost back in third to 600nm at the hubs to save the gear as i make nearly 750nm at the hubs on a mainline
×
×
  • Create New...