sonofsam 5 Posted March 28, 2007 On occasions Im seeing overboost, gauge reading .7bar, not the usual 5. Smells really rich too when she's at it, lol So does this mean that when the ECU senses everyting's tiki ti bo , it gives overboost? Share this post Link to post Share on other sites
veloce200 3 Posted March 28, 2007 On occasions Im seeing overboost, gauge reading .7bar, not the usual 5.Smells really rich too when she's at it, lol So does this mean that when the ECU senses everyting's tiki ti bo , it gives overboost? I expect the ECU has all sorts of "events" programmed into it! A difficult one to comment on that. Share this post Link to post Share on other sites
inferno 1 Posted March 28, 2007 consider an external wastegate setup a 0.5 bar spring can easyly be adjusted upto 1bar, and more with a reg valve. less creep than with an internal too. speaking from reading up mind, my cars not ready yet to confirm! Share this post Link to post Share on other sites
tom_m 0 Posted March 29, 2007 (edited) On occasions Im seeing overboost, gauge reading .7bar, not the usual 5.Smells really rich too when she's at it, lol So does this mean that when the ECU senses everyting's tiki ti bo , it gives overboost? is it random or only on WOT? what do you make of this? would explain why people who adjust the wastegate tension have problems with the boost limit, if the engine is already over boosting and then the ecu tries to overboost it some more and hits it's boost cut limit! Edited March 29, 2007 by tom_m Share this post Link to post Share on other sites
sonofsam 5 Posted March 29, 2007 Yeah it's only on WOT and when the cabin stinks of petrol! Interesting, can only just make it out though. Will try translate later. Share this post Link to post Share on other sites
sonofsam 5 Posted March 30, 2007 Not had any luck translating it Anyone want to have a crack? Share this post Link to post Share on other sites
tom_m 0 Posted March 30, 2007 (edited) well if babel fish is worth its salt it says something like: boost pressure: 0.3bar @ 3000rpm on vaucuum (partial throttle?) 0.65bar @4500rpm on vacuum 0.9 bar @ 300orpm on full (throttle?) pressure of the regulator valve 1 bar (boost cut?) displacement of the regulator valve 3mm(?) but you know what id swear the first line mentions a charge cooler, and i've only just noticed that. i'll have a bash at that later. i'm off home now Edited March 30, 2007 by tom_m Share this post Link to post Share on other sites
TEKNOPUG 3 Posted March 30, 2007 Maybe your car has stolen MY boost? Share this post Link to post Share on other sites
sonofsam 5 Posted March 30, 2007 For every action there is an equal but opposite reaction. So in short, yes my car has got your boost. Do I have to give it back though Or maybe we both have sticky wastegates?! Share this post Link to post Share on other sites
inferno 1 Posted March 30, 2007 enjoy it while u can... mines going to be steeling all your boost this weekend and using it to suck small children and pets up off the street... Share this post Link to post Share on other sites
bales 1 Posted March 30, 2007 (supercharged xu10j2cte) Supercharged by a turbocharger with ...... the application of an air to water heat exchanger Manufacturer / model : Garrett T025 Supercharging pressures: 0.3 bar @ 3000rpm on part throttle 0.65 bar @ 4500rpm on part throttle 0.9 bar @ 3000rpm on full throttle Command (max) pressure of actuator : 1 bar Total travel of actuator rod : 3mm Share this post Link to post Share on other sites
bales 1 Posted March 30, 2007 But if that was the case then wouldnt you see the boost gauge move to 0.9 bar at 3000rpm then drop back down at higher revs. Also why would it be running 10psi on part throttle?, I wouldnt have thought there would be enough load on the engine to actually generate much boost on part throttle? Doesnt really make that much sense to me. Share this post Link to post Share on other sites
sonofsam 5 Posted March 30, 2007 God this engine is such an enigma! Only time I saw 0.9bar was when the boost solenoid broke(or was it)? Just been having a little read up on www.turbodynamics.co.uk. It wont let me copy and paste, but there is a part on the actuator page at the bottom, that states: That many turbo cars that run a solenoid boost controller have paremeters in the ECU to not activate the solenoid till the engine is upto running temperature,,. interesting as I *think* I have experienced that too. So if it can do that, then surely overboost is possible, but google throws up nothing, only OB on T16 and derv models and I think the T16 is high/low boost anyway? Share this post Link to post Share on other sites
jim21070 2 Posted March 31, 2007 (edited) Also why would it be running 10psi on part throttle?, I wouldnt have thought there would be enough load on the engine to actually generate much boost on part throttle? Doesnt really make that much sense to me. I can run with it (I think ) The turbo is very small (Small A/R ratio) and thus will spool up with not that much exhaust velocity. These engines move mountains of air through them and so I can see them generating 10psi at 3000 RPM no problem at all. In fact at this point I reckon the turbo will be running practically smack-bang in the middle of its "Efficiency Island" PSA engineered this engine as a Constant Torque (CT), optimised for grunt in the low and mid-range. The turbo looks to be perfectly sized for this. I may be talking total rubbish though, just my theory EDIT: This reminds me of the "Modulated Boost" on the old Turbo Metro. maybe much the same kind of thing but in reverse. On the Metro, it was to keep torque down to a level the gearbox could safely handle. PSA may be using the same approach to up the torque at certain points in the curve. Edited March 31, 2007 by jim21070 Share this post Link to post Share on other sites
sonofsam 5 Posted March 31, 2007 Yep there is definately some modulation going on in it! Tested my car this morning, quite cold at 7.30am , would not boost at all, gauge reading 0 go it a little warmer, starting seeing 0.3, upto temperature got the full 0.5, then once she was good and ready saw 0.7 also it doesnt always give full boost in lower gears, probably to help out on wheelspin issues.. This may expalin why alot of people used to think there boost valves were broken when they first jumped in their cars on a cold morning?! You got any plans to fit a boost gauge Jim? Share this post Link to post Share on other sites
jim21070 2 Posted March 31, 2007 You got any plans to fit a boost gauge Jim? Yes indeed and very soon too, along with a dump valve Share this post Link to post Share on other sites
Henry Yorke 269 3 Cars Posted April 1, 2007 also it doesnt always give full boost in lower gears, probably to help out on wheelspin issues.. The Vauxhall 2.0 Turbo engine restricted full boost in first for wheelspin issues. Mine overboosts to about 0.7 bar and then drops down to 0.5 according to the boost gauge Share this post Link to post Share on other sites
