Strange boost problem

[Tintin]

Here\'s one for you technical sorts


Coming back from from Pod I noticed that that when the second turbo kicks in in 5th instead of the boost staying at 0.8 it keeps going up till it gets up to about 1.1-1.2 ish , then it hits a flat spot and makes bbbbrrrrpppp sort of noise , boost backs of to about 0.9 then it starts rising again , its like it hits a rev limiter

I noticed this problem just after I got the car but thought it had gone away , maybe I wasn\'t nailing it hard enough in 5th for it to happen

It only happens in 5th , hit some traffic on the way back so when it cleared I tryed it in 3rd and boost stuck at 0.8 on both turbos

Any ideas

[scooby_si]

either way if you\'re not aware of ECU & fueling mods to cope with that boost anything over 1 bar should be back off time as i understand it........Sounds a bit like fuel cut can\'t remember if that is a possibilitiy thou?
Si

[Tintin]

As far as I\'m aware the fuel system is standard but the ECU has been upgraded to an RE-Amemiya one I\'m pretty sure its set for 0.8 bar as this is what it stays at in all other gears on both turbos

[bnaellis]

Originally posted by Tintin
Here\'s one for you technical sorts


Coming back from from Pod I noticed that that when the second turbo kicks in in 5th instead of the boost staying at 0.8 it keeps going up till it gets up to about 1.1-1.2 ish , then it hits a flat spot and makes bbbbrrrrpppp sort of noise , boost backs of to about 0.9 then it starts rising again , its like it hits a rev limiter

I noticed this problem just after I got the car but thought it had gone away , maybe I wasn\'t nailing it hard enough in 5th for it to happen

It only happens in 5th , hit some traffic on the way back so when it cleared I tryed it in 3rd and boost stuck at 0.8 on both turbos

Any ideas

BBBrrrrrpppp noise is fuel cut, shortcut mod eto kill the engine.
I have no idea why that happens in that gear only, never heard of that symptom before:confused:

rgds

[Tintin]

I\'m gonna e-mail RE-Amemiya to see if I can get the mapping details , had a look at the ECU got all the details off it only problem is some of it is in japanese

Brian , have you got any idea which bit they need ?

[Archbish]

I don\'t suppose you\'dbe doing about 112.5 mph, and the speed limiter kicked in, or anything like that?

ps - Niky is wrapped about her Lab Coat!!  I currently have ALL the brownie points in the world!!  *grin*  I am dead grateful!  Cheers

OJ

[Gerry M]

rea ecu should have a type letter on it A, B or C  you can find info on it on rea website in the online shopping, boosting 1.1 I take it the REA button if you have one is in the on position then?
I\'ve got a B type if I remember rightly & it only takes it to 0.9 with button pressed

[Tintin]

it is around 112 mark , but I\'ve taken her alot higher before , I\'m sure I\'ve had 140 ish , definatley had 120 numerous times

And a speed limiter dosn\'t explain why the boost goes up higher than 0.8

[Tintin]

Nah the button is off , only used the button once and I think it went to 1.2 maybe a touch higher , I was concentrating on the road is it was a bit of a blur

From the details I got off the ECU there was a bit that stated MAX BOOST P 1.1  S1.0

[gsb876]

Hi TinTin,

rather than speculate book the rx into WGTengineering and get the boost issue sorted or you may kill the engine by either over boosting or fuel starvation.

tel: 01606 48866 , ask for Pip.

They are based in Northwich J18 off the M6.:wave

[Tintin]

You\'ve probably got a good point there gurj , better safe than sorry , I\'ll give him a buzz

[Tintin]

Right booked in for Friday morning , I hope she dosn\'t have to stay in

[Tintin]

Problem sorted ish

Pip took the car out for a spin and within a minute he had diagnosed the problem , boost creep , the problem only seems to occur in 5th due to the speed the ambient temp is lower , but as winter sets in it will happen more and more

The fixes available where - go for a single turbo setup - gonna cost a bit I thought , have the wastgate bored out - still gonna cost as theres about 10 hours of labour or try a restrictor in one of the pipes near the wastgate ( can\'t remember which one ) - cheap but may or may not sort the problem

I decided to try the restrictor untill it comes to rebuild time , then sort it properly probably with a single turbo

Well I\'ve lost about 0.1 bar but the problems sorted

Also picked up a HKS BOV and an alli AST , so I\'ve got some new toys to play with :cool