What's the correct boost level in each gear?

[Jamo]

Now i've got a boost gauge i've been looking at my boost levels in each gear (car is homefried)

1st: 0.4 bar
2nd: 1.2 bar
3rd: 1.4 bar dropping to 1-1.2 bar
4th: same as 3rd
5th same as 3rd
6th: same as 3rd

Is this correct?

[kwlw]

Now i've got a boost gauge i've been looking at my boost levels in each gear (car is homefried)

1st: 0.4 bar
2nd: 1.2 bar
3rd: 1.4 bar dropping to 1-1.2 bar
4th: same as 3rd
5th same as 3rd
6th: same as 3rd

Is this correct?

Quite correct. Should overboost to 1.5 bar. But it depends on your boost gauge precision and boost leaks .

Sau

[Mihnea]

Sau, how do you know how much boost the homefries should run???????????

[S2 Ant]

sounds good Jamo, mines doing the same, boosts to around 21-22psi peak and tails down from there.

Altho something must be up somewhere as ive been seeing 25-26psi peak for a few seconds, then drops down to 21-22 before going down as normal.

[BRY]

sounds good Jamo, mines doing the same, boosts to around 21-22psi peak and tails down from there.

Altho something must be up somewhere as ive been seeing 25-26psi peak for a few seconds, then drops down to 21-22 before going down as normal.

I'd get that checked as Johnny had something similar happen to his and now its fooked.

[S2 Ant]

Im guessing it may be the WGFV if its going too high, ive been keeping an eye on it and its not everytime i floor it, only sometimes, so sticky WGFV perhaps?

[BRY]

How much higher than the "set" boost is allowed before overboost protection cuts in?

[kwlw]

Sau, how do you know how much boost the homefries should run???????????

I don't know, I guess from my expierence. Usually homefry tuners usually max out stock ABY (I guess 1995 S2 is aby) pressure sensor on overboost. That is 1.5 bar - right ? .

Also I have seen some "god only knows where from it came" chipsets which did the same...

Am I wrong ?

Sau

[WabTheKing]

sounds good Jamo, mines doing the same, boosts to around 21-22psi peak and tails down from there.

Altho something must be up somewhere as ive been seeing 25-26psi peak for a few seconds, then drops down to 21-22 before going down as normal.

is this not spiking???!

possible caused by a dodgy wgfv?

do you A: buy a new wgfv

or B: add £150 and get a funky boost controller

[S2central.net]

I don't know, I guess from my expierence. Usually homefry tuners usually max out stock ABY (I guess 1995 S2 is aby) pressure sensor on overboost. That is 1.5 bar - right ? .

Also I have seen some "god only knows where from it came" chipsets which did the same...

Am I wrong ?

Sau

Well going by the turbo map for the K24 a maximum of about 1.3 - 1.4 boost is the norm. The wee K24 isn't terribly efficient at these levels for long so air temps will get out of control unless boost is substantially reduced at the redline...

[kwlw]

Well going by the turbo map for the K24 a maximum of about 1.3 - 1.4 boost is the norm. The wee K24 isn't terribly efficient at these levels for long so air temps will get out of control unless boost is substantially reduced at the redline...

Interesting. Local backyard tuners used to run up to 1.9 bar with K26 (probably air hot as hell). So I thought 1.5 bar is quite normal with K24.

Now I am thinking in other way . Thanks for explaination

So if my killer chip is making 1.5 bar - does it mean, that my engine is getting too hot air to be efficient and too exaustive to the that tiny fast spinning thingy called k24 ?

And could someone explain me that "turbo inefficient - air too hot" situation, when I use huge intercooler. Is the pressure dropping in the intercooler when air is cooling to the temperatures suitable for engine ? I mean if I have megaboost with megahot air, and add megacool intercooler to the system, then after air cools down and pressure drops, I just get moderate boost with badly worn or blown turbo ?

Sau

[Jamo]

Turbo inefficiency, basically the turbo gets to a point where it is no longer compress the air in the given compressor space and increasing the boost pressure beyond this point just results in heating the air and increasing the charged air temperature.

[Doug_RS2]

I'd get that checked as Johnny had something similar happen to his and now its fooked.

Not related problems.

[BRY]

Not related problems.

WTF?

Fact 1
Johnny's car had boost spikes way above his normal running presure

Fact 2
Johnny's engine is now fooked

I think the two are related somehow, as they were within half an hour of each other.

How do you explain the pile of bits in his garage then?

[Doug_RS2]

He had a boost spike - so was driving part throttle for a while.

Driving part throttle is not going to cause a lump of metal to fall out of an exhaust port. If it was the seat or valve that had melted then it would be related. The ports have been opened out too much - it was only a matter of time. I expect he got the head done at the same place my head was done by the previous owner (both work was done by the same garage) - not a good job done on either of them - both have had problems due to bad workmanship.