Moderator: Luke
Scorpio67aussie wrote:Hi I'm having trouble finding maximum boost pressures that the turbo runs standard, my transit is a mk6 2001 125 t350 high roof long wheel base my ford dealerships and head office have no clue apparently and what would the maximum boost you could increase to without engine problems and engine modifications sorry if this has been asked before but I can't find it with thanks Richard
knobby1 wrote:but my Mk7 140 TDCi (remapped) is in excess of 23psi at the manifold on a full pull.
Lord Knobrot
wojciech wrote:23 psi = 1.59 bar In tdci turbo is VGT, so PCM can control pressure. In tddi turbo has Wastegate, it works independently to PCM on short feedback loop. Pressure correction is possible only on Wastegate tie-rod.
knobby1 wrote:It's basically controlled by the PCM depending on load, throttle position & RPM....but others have had them remapped which usually helps greatly.
Not sure on the max boost for a Mk6 125 TDDi...but my Mk7 140 TDCi (remapped) is in excess of 23psig at the manifold on a full pull.
Lord Knobrot
nedforceone wrote:I get about the same as you your lordship, foot down I can see 25 psi of boost, normal driving is around 10 - 15 psi (granny driving ) but I have my boost gauge take off pipe just after the resonator (think that's what that plastic thing is just after the turbo) not sure if it makes much difference N
I know it, but Scorpio67aussie has Mk6 and wrote about Mk6 - so I also wrote (with an implied ) about Mk6.knobby1 wrote:wojciech wrote:23 psi = 1.59 bar In tdci turbo is VGT, so PCM can control pressure. In tddi turbo has Wastegate, it works independently to PCM on short feedback loop. Pressure correction is possible only on Wastegate tie-rod.
Not "all" Mk7 TDCi's are VNT, some have a wastegate...
Lord Knobrot
Scorpio67aussie wrote:Thank you everyone for the replies
mine has lost power I put a boost gauge on it and it was showing 15 psi and now has dropped to 13 psi it just doesn’t have the same excelleration and has lost economy
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