Jump to content
SAU Community

Recommended Posts

hey just installed a greddy copy plenum...went on ok but 1st drive.............. feels very responsive in first if you floor 1st and hit second i get heaps of lag and if you go third even worse.....4800rpm in 3rd boost still climbing.......but if you jst cruise in third and wind it out progresively putting the throttle down it boosts fine hits full boost by 3600rpm ...i have plumbed the wastegate actuator into a nipple on the plenum itself...it has got a long hose to get arond the motor...i am changing it when i got time to add a nipple to my pipeing turbo side.......so do you think the lengthy hose may be a problem....i????or maybe the feed for the wastegate from plenum is no good??? bleed valve maybe??? i dont know whats your thoughts.....????? take so long to build boost after gear change ...oh and the blow off valve is now mounted on the pipe straight after the turbo ( the metal one)

post-28208-1230549022_thumb.jpg

post-28208-1230549217_thumb.jpg

post-28208-1230549377_thumb.jpg

like the garden hose for pipe?????

its getting changed tommorow when i get to auto shop...its the acc valve feed line.....

anything wrong you can point out to me would be great

cheers

mitch..........

can you hear an air leak anywhere? either between the manifold and the head or the throttle body and the plenum. thats what ive got my $ on.

were the surfaces machined flat?

yeah gaskets and aviation quailty gasket goo...i thought boost leak but it always hits hard in 1st like is great but its only once you changed it takes to long to build boost....plenum suface was machined from factory it was flat... put straight edge on it....and sat it on a machined surface was not warped or bent......so i thought maybe not boost leak because in first i have no probs.....im thinking something with waste gate maybe.......

im putting a nipple jst after compressor housing...to see if it helps....

block off the standard bov????? ya reckon???

its plumbed back like standard again ..bt yeah got a turbosmart boost t witch i think is the culpret....i adjst it and boost dont change so hmmmmmmm

if i was running entirely off the wastegate actuator no beed...what boost should i see......like 5 psi maybe ????

Well its more than likely going to be resulting from whatever you changed/touched.

So go over every single part that you touched, and check its connected/together/not leaking.

If you touched a hose clamp, make sure its done up etc etc.

Until you go over everything and triple check your work, its going to be hard to say as boost can leak from anywhere

First thing is first check for any vacuum/boost leaks and the usuall as everybody has stated.

If you are using a after market ecu it may require a tune as you have changed the induction .

Just like when you install a new larger turbo . If you where running std crossover intake pipe and went to the side mount plenum you are changing all you volicity and dynamics of how the engine receives it air. You are going from a long runner setup to a short runner set up.

I may be wrong but it's just a thought..

hey problem solved...dont ask how....was going to block bov to see if its positon so close to the turbo was an issue....so instead of blocking it i thought i would just take the air line going to it off...so thats what i did..went for a drive no difference in the lag.....so i went home put air line back on went for a drive ...now it dosent lag between gear changes....and my boost is settled down not unpredictable...

so i dont really know what changed but its all good....went for a drive with The Mafia in his car yesturday...anyone who doubts what he has done i will vouch for him his car is a monster nice and stock looking but geez!!! made my car feel like a hyundai!!! MORE POWER!!! very quick

cheers for you imput

Have you made sure your throttle cable is at the correct length?

Sometimes after plenum installs the throttle cable is too long, the butterfly will not open 100% even though you have your foot to the floor.

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

    • Does that German restaurant still exist in the old place out the NW end of Goulburn? When I say "out the NW end of"...I am really being vague. It was 1997 when I was last there, and the only point of reference I can recall is that it was on the opposite side of the main drag from the big merino. And when I say "opposite side of the main drag", I don't mean "on the main drag". It was either a couple of streets back from there, or might have even been out in the sticks a bit further. Was an old farm building or mill or somesuch. And when I say "the big merino" I might actually be thinking of a completely different part of town, because I just looked on maps and the big bugger is not where I remembered him to be! The food was good, consisting largely of various German mystery-meat sausage/loaf things and kartofflen.
    • So while the second sentence is completely correct and the whole point of the conversation, the first sentence bears consideration. If this bloke is just hoping to throw big turbos on and drive it around, because there are no helpful facilities at all in his tropical paradise** then he likely has zero chance of even knowing what the TP is on the last column in the stock maps, let alone know whether the ECU is operating anywhere near it or past it. So the point is very very moot. And, per what I said before, at stock boost on those turbos, you may well be off the end of the map. **I'm just back from Vanuatu, so I know exactly what small Pacific nations can be like wrt paradise without requisite facilities. But it's not even that simple. I put a high flow on my car and had to drive it around with a proper tune because of the lack of opportunity*** to put the bigger AFM and injectors into it to allow it to be tuned. I had to turn the boost down to less than I had before, and back off the boost controller's ramp, because it was exploring parts of the map that it didn't drive in before, and really couldn't access for tuning on the dyno either, and so was pinging. It was still well within the last column, because when I first**** set up the Nistune on the Neo I rescaled all axes of the maps to give some more space to explore. ***Family dyno was broken ****This was 13 years ago, and the TIM thing wasn't a thing then and so TP would definitely grow when pushing past the stock tune's limits.
    • Yep, this bit another local owner. I caught it before putting the transmission back into the car, what I noticed was the pressure plate fingers weren't flat and even. It's more obvious with the pull style clutch because the throwout bearing ring was visibly not flat once everything is put together. Nismo should really update their instructions to call out this specific detail. I'm not even sure the clutch as-shipped orients everything properly.
    • It ended up being that orientation of the float hub in relation to the clutch disk, when I installed it, I heard a loud click and being stupid, I decided to not take it a part and check it. The hub didn't properly align with the clutch disk and was causing the issue. Definitely an odd one! Dahtone Racing was able to fix me right up, stand up blokes!      
    • Right, but I'm saying on the stock ECU measured airmass from the MAF is no higher than stock. So it's accounting for the higher flow rate iso-manifold pressure. You just have to keep turning down the boost until you're within the stock tune's load scale. If you run off the end there's no telling what will happen. This does mean there's zero benefit to the turbos you're running vs stock, if anything it's just a straight downgrade because the transient response is worse, you don't even get the ECU's boost solenoid helping to pull the wastegate closed during initial spool, and peak power is only whatever the factory map can give you before you hit the R&R corner. On a -9 I would bet that you would have to change out the wastegate spring once you have a real ECU and you're tuning it for real. I'm not saying this is a remotely ideal state of affairs, it's just a way to keep it driveable until you can get a proper tune done.
×
×
  • Create New...