frankyurry

iTrader: (2)

hi all

just had a re-build and a re-map but twice now when im giving it some stick through the gears when i get into 5th i seem to loose all boost?
it is not like hitting a wall like fuel cut but like hitting a rev limiter!!
just wondered what it could be
a calapse of a hose ( as would not to be able to find as it only does it in 5th ) or a faulty solinoid as it does tick when it is on full boost!
any info or ideas would be very apreciated

Fuzz

When you say " all boost" have you got a boost gauge and is it dropping to 0.5 bar approx?
If so it could be the ECU lowering the boost due excessive knock correction.
In which case I'd take it back to who mapped it and explain..

frankyurry

iTrader: (2)

ok didnt cheak to see what boost it was running when it happened just let off the power!! would that only happen in 5th tho as it is fine in all other gears and holds boost fine just seemed to happen out of the blue!

bluejohndeere

112mph speed limiter ??

Fuzz

As you rag it up through the gears you basically get things hotter than they should so the ECU starts to pull the reigns in to save itself, first it pulls ignition timing out, if that doesn't work it takes the boost away.
So yes, 5th gear is a lot more stressful for the engine in that respect

Fuzz

double post

frankyurry

iTrader: (2)

ok mate will give my mapper a call tomorrow but the only down fall is that he built the engine as well and he is 250 miles away!! many thanks for the input

frankyurry

iTrader: (2)

no mate its a uk car and 112mph is 4th gear lol

bluejohndeere

ha. good luck

shag

iTrader: (10)

as above ,i had the same thing that turned out to be det, slight map tweek cured it.

frankyurry

iTrader: (2)

**** who done the map tweek for you mate?