saxo vtr turbo - Saxperience

dumper · 22nd February 2006, 18:42

hi i have a saxo vtr turbo which is boosting at 8 psi at the mo but wont hold its boost can any one help cheers rich

Ratty · 22nd February 2006, 19:50

its probs spiking at 8psi and not set at 8psi. Have you got a boost gauge, what boost is it holding too etc etc.

dumper · 22nd February 2006, 21:03

yeah ive got a boost gauge and it gets to 8 psi and then looses it more or less straight away could the actuator be weak?

gafvts · 23rd February 2006, 00:29

whats the spec on car mate

Ratty · 23rd February 2006, 00:32

well you havent answered my other questions, turbos always over boost then settle, in 5th gear at say 4k put your foot flat to the floor and thats whatever boost you have, you always lose a little in higher gears but in lower gears the overboost is alot more ie 2nd.

Id say its probs set at .6bar and your overboosting initially to .8 then it settles.

dumper · 23rd February 2006, 01:09

t3 hybrid turbo,lowcompression head,intercooler,fith injector,greenair filteroil cooler,chrome boost pipes,one off 4 branch manifold,mf2 bar sensor all the bizz really will be turned up to 15 psi shortly

Ratty · 23rd February 2006, 01:27

just wait for your pistons to melt and need an extra injector or injectors

Wolz · 23rd February 2006, 04:27

Have you checked for obvious faults , exhaust blowing ,boost pipes loose etc etc

dumper · 23rd February 2006, 11:49

if they do forge pistons will have to be bought cituning assure me it will be ok safer with water injection though probably next on the agenda

dumper · 23rd February 2006, 11:51

yeah mate checked all the obvious cituning contacted td and there gonna send me a stronger actuator then start the diagnosis from there ill sort it eventsally

Ratty · 23rd February 2006, 13:31

its not about safer, standard pistons sooner or later will melt on a charged engine as they are not designed for the heat that boost creates, its only a matter of time, thats why you get forgies. Water injection is to combat high inlet temps, yet again not needed if your cars setup right and your cooling system is setup correct. And remeber water doesnt compress very well = more strain on standard components = bye bye standard pistons, good to see cittuning know what they are talking about lol

dumper · 23rd February 2006, 18:56

o right but they say this is a tried and tested kit on there own car WITH STANDARD PISTONS no detenation found after the engine was stripped down after 6000 miles thats why they do the head to lower compression cheaper and the same as having pistons

jaybiss · 23rd February 2006, 19:21

can i ask a q

how much did the conversion cost you???

dont have to answer if you dont want

S9_DAN · 23rd February 2006, 19:59

nope he didnt want to

Ratty · 23rd February 2006, 19:59

its not about detanation either, detanation is where the gas and fuel ignite before the spark fires as either the compression is too high (which is what happends on a boosted engine) or the air is too hot and ignites when compressed and the spark flame and ignite flame collide causing a massive bang and also leaving pit marks in the pistons) With correct fueling this doesnt happen, but as said the heat created with boost will eventually destroy the piston because they cant cope with it. Crap example but if you use paper to hold water it will do it for a while until it splits and water leaks through Same with pistons it will take it until its worn then break.

and 6000 miles is hardly proof, 20k and i might consider it.The 6000 miles could of been normal driving with the turbo hardly used rather than 6000 miles of always using the turbo.

Cittuning starts from 2k-4.5k