Help! Over boosting I think 1.44 bar?

[stu306]

Need some advice please, before something bad happens.

 

Have a 99 model TT tip with VVTi engine, Jap import, is BPU’ed.

 

Greddy Fuel Cut

Greddy Profec B spec II 'boost controller'

JPS Full bore VVTI Downpipe and Mid pipe (all heat wrapped)

 

Took it to a DAT inter. Day RR a few weeks ago just to see what is it could do and found out it was pushing just over 400bpu but also hitting 1.4 bar.

 

I bought the car just under a year ago from a chap who seemed to know well more than me and have not touched the setup. Profec was set to psi and everyone talks bar so never really thought anything about it…….but now I do. Have changed to bar and started to pay attention.

 

So If I steadily hold it up to around 3500 and keep an eye on the boost gauge we are hitting around 1.1 bar, soon as I push it up near 4000, bang we are up to 1.35 – 1.43 bar.

 

First question…yip restrictor ring is in place, see attached.

 

Below are controller settings, from what I have read though this has no bearing on max boost.

 

SET – 69%

GAIN – 35%

SET GAIN – 0.34

WARNING -1.37

LIMITER – 20%

PEAK – 1.44

LAST BOOST – ON

 

So what do I do??

 

ECU is stock

 

I know the car has uk brakes, not sure about the injectors or the turbo’s, can you let me know how to tell?

 

HELP….HELP….HELP it’s nice and I wanna keep it that way!

[Rich]

change the restrictor ring to a 1 bar one.Sounds like you have a 1.2 bar ring in place.Also turn the boost controller off .

[Homer]

Try reducing the SET value, this is the ratio from the natural boost value (based on the restrictor ring and no BC), it's quite high at present.

 

You might also need to reduce the GAIN if you are seeing the boost spike just after the 2nd turbo spools, but that's more fine tuning.

 

As Rich mentions, the best way to troubleshoot issues is to turn the BC off and find the natural boost level, this will allow you to configure the BC to desired levels.

 

Overall the boost level is too high, do you have an AFR or EGT gauge installed? AFR is really required for BPU cars.

[stu306]

Thanks guys, can you point me to any sellers for a 1 bar restrictor ring and NO there is no AFR fitted so again same as above. Will do what both of you said tomorrow and let you know the results. Thanks again!

[wile e coyote]

I have a 1 bar ring in and still see 1.3 sometimes !!

[Homer]

I have a 1 bar ring in and still see 1.3 sometimes !!

 

Feel like I'm repeating myself here, but you have other boost related items installed, such as the HKS Fcon These alter boost pressure limits so do not apply to BPU cars like the OP requested info on

[mikeyb10supra]

Are they UK turbos/hybrids?

[stu306]

Are they UK turbos/hybrids?

 

 

Sorry how can I tell?

[stu306]

Turned to boost controller off. Holding it around 4k on the revs is now sitting about 0.7 bar. Opened up to full throttle and peak boost is 1.12 bar. So would I be right in thinking it is down to a poorly configured boost controller and it is just a case of dropping the SET and GAIN till it is right? Here is the graph from the RR day.

 

http://i634.photobucket.com/albums/uu66/stu306/Graph.jpg

[johnny g]

That graph tells nothng mate, it's a bit of a joke TBH.

 

Turn the SET and the GAIN to zero, and go for a run, and slowly increase the SET until you get your desired boost.

 

This is a decent write up

http://www.sr20forum.com/turbo-guides/86098-how-how-tune-your-greddy-profec-b-spec-ii.html

[Rich]

Turned to boost controller off. Holding it around 4k on the revs is now sitting about 0.7 bar. Opened up to full throttle and peak boost is 1.12 bar. So would I be right in thinking it is down to a poorly configured boost controller and it is just a case of dropping the SET and GAIN till it is right? Here is the graph from the RR day.

 

http://i634.photobucket.com/albums/uu66/stu306/Graph.jpg

 

As Johnny says,its obviously a boost controller settings issue,at 1.4 bar or whatever it was running you are pushing it a lot.