Just noticed you're on the list for johns barbie this weekend JP. The car will be there too.

_________________
If at first you don't suck seed, try drier grain.

Ah ok. Will bring along the datalogit and software and have a looksie. / you can take it away with you if it helps/I am too drunk.

_________________
JP
GT4DC Treasurer

Grey St185 RC
Silver BMW E46 M3
Multicolour yawn Honda VFR400
Silver Honda Civic Type-R

Are you still on the mechanical boost control Jon ?


no, running aem tru boost at 1.1

_________________
1998 ford st24, 186hp 2.5 v6- sold
1997 bmw e36 318ti, mint hellrot red- sold
1992 celica gt4 st185- td04 340hp/330lbs
1998 mercedes E280- sold
1998 pug 1.9 td- mile muncher!
1993 rx7 542hp savage monster!!
2007 BMW 335i- in the shop gettin built!!

Is the pressure sensing for the boost controller on the manifold side of the throttle body ? If so try moving it to the pipework between turbo and throttle body.

_________________
If at first you don't suck seed, try drier grain.

I have moved my mine last night so the boost sensor is now from the pipe coming off the back of the CC, and not from the manifold side. Will try it this morning and see if it makes a difference?

The engine was rebuilt about 5K ago just before I bought the car.
DeCAT
Hybrid turbo (7 or 8 blade)

Other things I have had suggested to me are:-

Spark plugs?
Fuel filter?
Worn fuel pump?

Well when I had mine mapped I put new grade 7 plugs in, new walbro 255 fuel pump, and filter was changed about 3k ago.

Doubt its those things.

_________________
1998 ford st24, 186hp 2.5 v6- sold
1997 bmw e36 318ti, mint hellrot red- sold
1992 celica gt4 st185- td04 340hp/330lbs
1998 mercedes E280- sold
1998 pug 1.9 td- mile muncher!
1993 rx7 542hp savage monster!!
2007 BMW 335i- in the shop gettin built!!

Interesting but I have no idea how to interpret the results of the move of the boost sensor but:-

Before it was boosting at 1.2 bar.
Moved it is boosting/reading a max of 1.35 bar.

Quickly switched to channel "A" which was now boosting at ~1.1 bar max. Before it was about 1.0 bar.


Seems a big difference between the two places?

_________________
[color=#000080]ST205 WRC 1994
Hybrid turbo
Apexi AVC-R
Apexi Power FC (Not being used ATM)
Apexi Power commander (Not being used ATM)

But did it stop the surge as you slowly lift off ?

_________________
If at first you don't suck seed, try drier grain.

I thought I was confused, but know I know I am.

In the AFC-R boost controller is reading:-

Before it was boosting at 1.2 bar.
Moved, it is boosting/reading a max of 1.35 bar.

But the Power FC is reading ~1.2 bar as before.

It is the boost controller that is controlling the boost, so why is it not opening the waste gate when it sees the new higher boost levels?

More interestingly, which reading is correct now?

And yes, it does feel smother now!

_________________
[color=#000080]ST205 WRC 1994
Hybrid turbo
Apexi AVC-R
Apexi Power FC (Not being used ATM)
Apexi Power commander (Not being used ATM)

The reading on the map sensor (ECU) is the correct reading. The boost controller is now reading the pressure before the restriction of the throttle butterfly so will be higher.

As to why the boost controller isn't reducing the boost to compensate, I guess the gain is fairly low. This then makes me wonder about the original diagnosis.


Did Ryan actually take the car for a drive before handing it over ? I'm puzzled as to how / why he would hand the car over and take money for a car that was (to me) so undrivable.

_________________
If at first you don't suck seed, try drier grain.

Im unsure as to how to change the thing, but ryan took me for a drive but only to show if it boosted correctly.

Strange thing is that like phill said, I get slightly different readings on boost controller gauge compared to apexi. Sometimes can read a difference of nearly 0.1 bar.

_________________
1998 ford st24, 186hp 2.5 v6- sold
1997 bmw e36 318ti, mint hellrot red- sold
1992 celica gt4 st185- td04 340hp/330lbs
1998 mercedes E280- sold
1998 pug 1.9 td- mile muncher!
1993 rx7 542hp savage monster!!
2007 BMW 335i- in the shop gettin built!!

Yes, he took me out for a drive and it had a problem where when you lifted off the throttle it through you at the windscreen.

I left him to adjust the TPS if I remember correctly, and thought he had sorted it.

I then drove the car as I had to get to work, but noticed a few lurches/cutouts under hard load?

I will check a few things and then speak with Ryan again.

I must admit, I have not had the problem in the short journeys today.

_________________
[color=#000080]ST205 WRC 1994
Hybrid turbo
Apexi AVC-R
Apexi Power FC (Not being used ATM)
Apexi Power commander (Not being used ATM)

CDB and I had a bit of a look and test drive yesterday at Johnnieboy's BBQ.

Unfortunately my old laptop is dead and I haven't got a USB to serial convertor so hand controller only could be monitored. Datalopit has been left with NoGt4 and check your PMs for software.

TPS position was way off and hence IDL switch was activating even with part throttle (I think that is the way round it was!)

Full load run and you get knock when you back off with an occasional backfire.

TPS position was reset by CDB and one of the issues at low RPM seems to have been improved.

Something odd is happening and the maps need to be pulled & checked.

_________________
JP
GT4DC Treasurer

Grey St185 RC
Silver BMW E46 M3
Multicolour yawn Honda VFR400
Silver Honda Civic Type-R

Indeed, the hesitation going on the throttle from over-run has now been removed by resetting the TPS.

The problem remaining seems to happen when lifting throttle slowly, not just from full throttle but from part throttle, e.g. accelerate up to speed then back off to leave speed constant and the car starts kangarooing. Slight lift off from full throttle produces a backfire (sounds like through inlet to me) and a flicker on the ECU light and brief high knock reading and a huge short reduction in injector duty. Seems almost like acceleration enrichment in reverse (decelleration weakening).

_________________
If at first you don't suck seed, try drier grain.

I hope you both, Nibbles and Diceman got the emails with the maps and software to view it.

I did not want to post all the screenshots as there are loads of different views.

Looking forward to your views, as, if the map looks OK as I expect, could by poor plumbing, leak, restriction ect..ect.ect.. but what??

Appreciate your help

_________________
[color=#000080]ST205 WRC 1994
Hybrid turbo
Apexi AVC-R
Apexi Power FC (Not being used ATM)
Apexi Power commander (Not being used ATM)