You ain't kindding! Fasten your seatbelts then!!! Do you already know where could you source a new turbo from?
You ain't kindding! Fasten your seatbelts then!!! Do you already know where could you source a new turbo from?
Certainly do!!, Mik from Impossible has an IHI turbo that should push me up to 280Bhp with a remap!, now all i need is an excuse to fit it ;o)
Ok, taken my N75 off now, here's the pictures, cant see any restrictors in any of the pipes at all as standard on the 'F' version, what do you think Sim?, do you need any different shots from different angles?
the restriction in my N75 is 1.65MM, do i need to add a restrictor to this same side of the N75?, or should it be in the inlet to the valve?
So i suppose you have found the restriction by now then. It is best seen on pic3 however.
I have checked mine "C" version. I don't have any tool which i could use to do a correct measurement, so i put my 1.5mm drill bit inside, which fit it and the gap which left could be roughly 0.15mm, so the restriction on C & F valves should be the same.
You also should go for the 1.5mm i think. The restrictor should be put before the same line you have found the restriction in.
Here's a pic:
Just for the hell of it I have got hold of the required tools and equipment and made one of these this afternoon.
My car is not chipped it is standard so I am willing to give it a go to see what happens!
Drilled by hand which is not to difficult with a steady hand and decent drill and bits (I have a drill stand but no drill to fit it!)
I will see what happens ... back in a mo!
My car is not chipped it is standard so I am willing to give it a go to see what happens!
Drilled by hand which is not to difficult with a steady hand and decent drill and bits (I have a drill stand but no drill to fit it!)
I will see what happens ... back in a mo!
I am just connecting a 3 way bleed valve up with one port blanked off so that it works as an adjustable restrictor, i will fit it in about an hours time and se what it can do for me!
I've done it and tested it!!, i set it so that it had a significantly higher resistance to blowing through it compared to the N75 restriction (i would estimate it to be around 1.5mm restriction) and it hasent made any difference really!, still surges, but the ititial boost spike it biger than it used to be but sinks back quickly to what it used to be before,
I will play around with it tomorrow morning as i've got to visit the inlaws with wife in the car and she doesnt like me flooring it and then stopping to fiddle around under the bonnet!!
I will play around with it tomorrow morning as i've got to visit the inlaws with wife in the car and she doesnt like me flooring it and then stopping to fiddle around under the bonnet!!
Hmm, then it must be the valve itself which surges . I got a C one and it doesn't surge for me luckily.
As for the higher initial boost; this is what exactly the restriction is meant to be. A lil' tuning for the low revs. The more the N75 will be restricted, the longer the initiall pull will be sustained.
When i had a 1.2mm restriction, the turbo boosted up till 4000 RPM like mad, BUT. And here comes a big BUT!!! Since it was way too restricted, the actual boost exceeded required boost a lot more than ECU would tolerate (like with 1.5mm for example), and ECU closed the N75 valve immediately causing a huge flat spot. Once ECU regained control over N75 again (at higher revs) everything was fine.
. I got a C one and it doesn't surge for me luckily.As for the higher initial boost; this is what exactly the restriction is meant to be. A lil' tuning for the low revs
. The more the N75 will be restricted, the longer the initiall pull will be sustained.When i had a 1.2mm restriction, the turbo boosted up till 4000 RPM like mad, BUT. And here comes a big BUT!!! Since it was way too restricted, the actual boost exceeded required boost a lot more than ECU would tolerate (like with 1.5mm for example), and ECU closed the N75 valve immediately causing a huge flat spot. Once ECU regained control over N75 again (at higher revs) everything was fine.
Sorry about the delay, had to take the missus out.
Ok Fitted and installed with no ptoblem at all, took it for a run and its seems to run fine. Not sure if I can tell the difference at the mo. Temp is quite warm and muggy so probably not best conditions ??? What sort of difference should it make ?? Would a smaller hole be worth trying.
The missus is using my car tomorrow so will have to wait until the afternoon to see if I notice a differnce ... then again I'm bound too I have to drive her car until then (not that there is anything wrong with her car in case she reads this!)
I have left the old pipe in place at the mo so I can switch back in a matter os seconds if needed.
I can make another one or two if anyone wants to try it.
Cost me about £7 in total.
I have a picture for you to check which I willl post tomorrow as I'm off out now to get pissed as I dont have my car!
Ok Fitted and installed with no ptoblem at all, took it for a run and its seems to run fine. Not sure if I can tell the difference at the mo. Temp is quite warm and muggy so probably not best conditions ??? What sort of difference should it make ?? Would a smaller hole be worth trying.
The missus is using my car tomorrow so will have to wait until the afternoon to see if I notice a differnce ... then again I'm bound too I have to drive her car until then (not that there is anything wrong with her car
in case she reads this!)I have left the old pipe in place at the mo so I can switch back in a matter os seconds if needed.
I can make another one or two if anyone wants to try it.
Cost me about £7 in total.
I have a picture for you to check which I willl post tomorrow as I'm off out now to get pissed as I dont have my car!
It should give you more low/mid torque up till 3500RPM. A smaller hole may cause you a flat spot after the bigger initial kick.
Come on guys! Tell me your experiences with this mod!!!
I've just taken the restriction out also put the original plastic DV in (instead of Forge) and my car feels pooooooo (hot weather tho).
I've just taken the restriction out also put the original plastic DV in (instead of Forge) and my car feels pooooooo (hot weather tho).
i've fiddled around with the restrictor valve all the way down to no flow and none of the settings seem to give me more power or cure the surging i'm getting,
Others should get different results though because of the 1.3bar chip i'm running it isnt possible to push the turbo much harder than i do!
Others should get different results though because of the 1.3bar chip i'm running it isnt possible to push the turbo much harder than i do!
Drove the car to work this morning (14oC) and I must say it did seem to pull a little better.
It definately hasn't altered the car for the worse anyway.
I will run it for a couple of days like this and then out the straight through pipe back on to see if I notice the difference then.
I may also try one with a slightly smaller hole.
It definately hasn't altered the car for the worse anyway.
I will run it for a couple of days like this and then out the straight through pipe back on to see if I notice the difference then.
I may also try one with a slightly smaller hole.
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