boost leak ...I think

[t5tart]

I say i think cause i have only noticed it after fittin a decent (ish) boost gauge

seems if I woot it boost pressure goes up to about 1.4 bar (20 psi ish)


leave it woot and it gradually drops to about 1 bar (14.5psi)

now is this normal as the engine requires less boost ...or do i have a leak ??

or is it something im overlooking ........


if it is a leak where do i start lol ????
and no its not leaking from the splice for the gauge behind the dash !!!

[Mrsmopp]

First of all was it boosting to about 1.4 bar prior to the fitting? (ie does the standard boost gauge show anything different now?)

My last 850 was boosting to 1.4 bar (and holding) with RICA and we found the problem to be a knackered BCS.

With your boost dropping off it sounds like the ECU isn't very happy with all that boost and and pulling some of it back - be careful, @ 1.4bar you are coming up close to rod bending territory!

x

[t5tart]

standard boost guage is showing the same

its been chipped by supervhips but trying to find out from them what boost you can run on it is well you may as well ask a baby to explain calculus lol

noob showing here whats RICA ??

[Mrsmopp]

RICA - ECU remapping done by VolvoTuning in Bromsgrove.

I would seriously get her checked in with the vet and see whats going on. the problem with people like superchips is they dont specialise in a particular marque of car, I take it no diagnosits were done by them before and after fitting the superchip? How long have you had the chip?

x

[t5tart]

yes they did diagnostics....

chip has been fitted about 2.5 yrs


but i have only just started getting my hands dirty myself after a 'mechanic' told me the turbo had gone and it was a vac line off lol

[elliot]

The only reason that the boost is fading is because thats all the turbo is capable off.The turbo simply cannot flow enough air through the std exhaust,head etc to supply anywhere near 1.4bar hehe it has a max efficency of around 14psi much over that without breathing modds just makes ALOT of heat espicially in the summer.If i were you i would back the mbc off a bit so it spikes to a max of 1.2bar.
By the way superchips remove the load cut from the ecu that cuts igniton if it sees to much boost so be very carefull. The factory boost control uses TPS, MAF sensor, and RPM sensor in order to compute the boost level the car is 'seeing' because it does'nt have a MAP signal. If the car 'sees' to much boost the timing is retarded, and if that doesn't fix the problem, then the mixture will be enriched, then BCS reduces boost if that doesn't work. My point is that if the car is knocking it can retard the timing and richen the mixture,but the injectors will be allready up around 95percent at 1.4 bar so could be running lean you never know but it cannot reduce the boost because of the MBC and it cannot use the it's final line of defence cutting the ignition because superchips removed it.

I bet 1.4 bar on an mbc is nasty to drive in this weather :jaw: ,part throttle out of roundabouts must be exciting you would be better off and alot safer with a ecu that controls the boost.

[t5tart]

The only reason that the boost is fading is because thats all the turbo is capable off.The turbo simply cannot flow enough air through the std exhaust,head etc to supply anywhere near 1.4bar hehe it has a max efficency of around 14psi much over that without breathing modds just makes ALOT of heat espicially in the summer.If i were you i would back the mbc off a bit so it spikes to a max of 1.2bar.
By the way superchips remove the load cut from the ecu that cuts igniton if it sees to much boost so be very carefull. The factory boost control uses TPS, MAF sensor, and RPM sensor in order to compute the boost level the car is 'seeing' because it does'nt have a MAP signal. If the car 'sees' to much boost the timing is retarded, and if that doesn't fix the problem, then the mixture will be enriched, then BCS reduces boost if that doesn't work. My point is that if the car is knocking it can retard the timing and richen the mixture,but the injectors will be allready up around 95percent at 1.4 bar so could be running lean you never know but it cannot reduce the boost because of the MBC and it cannot use the it's final line of defence cutting the ignition because superchips removed it.

I bet 1.4 bar on an mbc is nasty to drive in this weather :jaw: ,part throttle out of roundabouts must be exciting you would be better off and alot safer with a ecu that controls the boost.

ah well yes there is alot of spinning up if you give it the berries
may well back off the mbc a bit roundabouts...i klive near milton keynes...yes it can be fun lol

thinking of redoing the mapping just need to get an idea on price ..... thought superchips was the way to go ...but the more I hear the more i think i went the wrong way

[Mrsmopp]

I dont think there is such a thing as a right way or a wrong way with tuning, what suits one person may nnot be right for the next - there are a handful of relly good remaps available to the T5, BSR, RICA and TME being the most popular butthats not to say that there rest are bad.

For the thee mentioned above your looking to pay about £300 there or there abouts.

x

[LeeT5]

I say i think cause i have only noticed it after fittin a decent (ish) boost gauge

seems if I woot it boost pressure goes up to about 1.4 bar (20 psi ish)


leave it woot and it gradually drops to about 1 bar (14.5psi)

now is this normal as the engine requires less boost ...or do i have a leak ??

or is it something im overlooking ........


if it is a leak where do i start lol ????
and no its not leaking from the splice for the gauge behind the dash !!!

Dont bother with ecu upgrades until you have replaced your exhaust with at least a cat back system (i can recommend Ferrita - sweet sounding but not too loud that you look like a knob in a volvo (if you get what i mean! :B_blite: ). You must also sort the air going in ie K + N insert at least.
Otherwise you will not gain the full benefits from rica etc.

Replacing the oe air filter removes intake restriction and replacing exhaust for 2.5" minimum stainless system removes back pressure = Awesome 5 pot warble, fantastic throttle response and looks good at the back!! :B_thumb:

[Mrsmopp]

Dont bother with ecu upgrades until you have replaced your exhaust with at least a cat back system (i can recommend Ferrita - sweet sounding but not too loud that you look like a knob in a volvo (if you get what i mean! :B_blite: ). You must also sort the air going in ie K + N insert at least.
Otherwise you will not gain the full benefits from rica etc.



You do not need to replace your exhaust or filter to get the benefit of the upgrade - I have never replaced an exhaust on any of my T5's and they have all been modified, most with a remap.

x

[LeeT5]

You do not need to replace your exhaust or filter to get the benefit of the upgrade - I have never replaced an exhaust on any of my T5's and they have all been modified, most with a remap.

x

Fair enough - But the oe air filter is still a restriction and the oe exhaust creates unnessesary back pressure.

Not saying your wrong but 16 years in the trade tells me i am right.
If you got the money its worth the spend...is it not?

[Mrsmopp]

"12-Q. Do I need a performance exhaust or a race-cat?
12-A. No! A performance exhaust or race-cat is entirely optional."

Taken from VolvoTunings website under FAQ's - they are definately the experts!

x

[LeeT5]

"12-Q. Do I need a performance exhaust or a race-cat?
12-A. No! A performance exhaust or race-cat is entirely optional."

Taken from VolvoTunings website under FAQ's - they are definately the experts!

x

Alright, alright. I wasnt having a go. You are right...and yes an exhaust and filter is optional.....but like i said..... :bog:

[siamblue]

You do not need to replace your exhaust or filter to get the benefit of the upgrade - I have never replaced an exhaust on any of my T5's and they have all been modified, most with a remap.

x

I am with Moppy and you,
My car was only Rica'd with a ITG and the thing was fast with a completely standard ex and cat, But replacing the exhaust and cat will free up a lot of power and reduce the restrictions in the system,
I have now sold my Rica and starting afresh with the zorst/tme then the cat/race plus 18T in the pipeline ,
so i can comment again in a few months when the cat/turbo has been replaced, as to what it was like with just a Rica/ITG,
no doubt after these have been fitted then the tune up will be more than i was used too.

GARY

[LeeT5]

I am with Moppy and you,
My car was only Rica'd with a ITG and the thing was fast with a completely standard ex and cat, But replacing the exhaust and cat will free up a lot of power and reduce the restrictions in the system,
I have now sold my Rica and starting afresh with the zorst/tme then the cat/race plus 18T in the pipeline ,
so i can comment again in a few months when the cat/turbo has been replaced, as to what it was like with just a Rica/ITG,
no doubt after these have been fitted then the tune up will be more than i was used too.

GARY

Thanks Siamblue, at least you understand what i meant.

Blimey, everyone's always on the defence in this forum....theres really no need to be. IT'S ALL FREE ADVICE!!!! Take it or leave it - make up yer own minds. :haha:

[volvotuning]

Thanks Siamblue, at least you understand what i meant.

Blimey, everyone's always on the defence in this forum....theres really no need to be. IT'S ALL FREE ADVICE!!!! Take it or leave it - make up yer own minds. :haha:

I don't think people are on the defensive. It's just that there are people out there that will tell you that you must fit an exhaust with an ECU upgrade, else your turbo will blow up, and other rubbish like that!

Adam.

[BlackBeast]

I am with Moppy and you,
My car was only Rica'd with a ITG and the thing was fast with a completely standard ex and cat, But replacing the exhaust and cat will free up a lot of power and reduce the restrictions in the system,
I have now sold my Rica and starting afresh with the zorst/tme then the cat/race plus 18T in the pipeline ,
so i can comment again in a few months when the cat/turbo has been replaced, as to what it was like with just a Rica/ITG,
no doubt after these have been fitted then the tune up will be more than i was used too.

GARY

And I run Gary's old Rica with a completely standard exhaust and air filter.

[Mrsmopp]

Not on the defensive just dont want people to assume that you "have" to have the zorst etc with the ECU - it puts people under false pretenses thats all.

x

[LeeT5]

I don't think people are on the defensive. It's just that there are people out there that will tell you that you must fit an exhaust with an ECU upgrade, else your turbo will blow up, and other rubbish like that!

Adam.

I agree, but thats not what i said.