What up with my Car - Lost 16RWHP

[imi]

Not a happy bunny - Lost 16hp on the wheels.....

 

Here are some plots from yesterday and then comparison plots from Surrey Rolling Road from last year.

 

My AFRs are better as it was running pretty rich last time.

What I dont understand is why the cars' pushing less Torque and less Power to the wheels.

 

Whats consistent is that the car is still not boosting upto 1.2bar (same as before - despite me changing all the hoses recently )

 

We tried to raise the boost on the AFCR to 1.3Kg/cm3 and that made no difference.

 

Any ideas?

 

They guys at Rebus think that its the Restrictor Ring that isnt allowing the car to boost upto 1.2bar.

 

1st three plots are from yesterday and 2nd three are from the previous session.

[Branners]

no two rolling roads will give the same figures so you cant really compare. Ambient temperatures will also affect things as will tyre pressures and the quality of the fuel you are using.

 

To do a comparison you need to keep using the same rolling road.

 

JB

[Gamer]

I would not worry about a 16hp loss as Branners said you will get different readings from different machines. Hell you will even get different readings on the same RR on different days due to the temps/pressures and fuel. It is not an exact science....

[BURT]

Imi.. i already told you this matey, just chill for a bit your car isnt dying...... yet!

[letmeshowyou]

The car isn't dying, but the fact it won't raise the boost on the controller means there is something thats not quite right - anyone any ideas what this could be?

 

As for different dyno's, can also see where Imi is coming from when you consider my Auto was giving out a higher figure at the wheels than his manual - doesnt make sense to me!

[BURT]

I didnt say it was dying... notice the smiley..it was just alittle humour. what.... so yours made more power at the wheels than imi's... and your point is??? what is it you dont understand

[letmeshowyou]

more or less same boost, same mods, and auto's are supposed to suffer quite alot more loss than the manuals arent they?

[BURT]

they are matey yes but depite the same mods etc its a differnt engine.. no two engines are exactly the same, despite the mods, and the fact that he was loosing boost makes a diff too. they will make complete different power no matter how alike the mods are,

MILEAGE, TYRE PRESSURE, INDUCTION TYPE, EXHAUST ETC.. all these can make a difference, aswell as that Imi has a sacf and if not set correctly this can cause loss of power too.

[terribleturner]

more or less same boost, same mods, and auto's are supposed to suffer quite alot more loss than the manuals arent they?

Adi, as Burt says no 2 engines are the same. How much difference was it out of intrest?? As for the loses isn't it 10% for manuals and 23% for auto's (though some people try for 25%).

 

 

I had a fault with my BC a while back where it wouldn't add any extra boost no matter what i dialed into it. Was very odd as it only happened on the odd occasion. I put it down to a dodgy hose but if it continues when im single then i think a new BC will be in order

[imi]

True. perhaps the title is a bit misleading, personally not that bothered about the 16rwhp loss, but am definetely concerned that it aint boosting upto 1.2 bar (Ive checked with whifbitz and it cant be the restrictor ring)

 

good thing is that we managed to correct the fuelling on the dyno and this is now fine by the looks of the AFRs.

 

Noticed something interesting that perhaps some of you may be able to help with. Ive got a SAFC and a AVC-R - both read pressure. when i switch the ignition to ON. the AVC-R reads a pressure of ZERO, while the SAFC reads -9 > -15 mm HG

 

why is that?

[imi]

Adi, as Burt says no 2 engines are the same. How much difference was it out of intrest?? As for the loses isn't it 10% for manuals and 23% for auto's (though some people try for 25%).

 

 

I had a fault with my BC a while back where it wouldn't add any extra boost no matter what i dialed into it. Was very odd as it only happened on the odd occasion. I put it down to a dodgy hose but if it continues when im single then i think a new BC will be in order

 

Adi pushed 308 rwhp while mine was 300 rwhp (301 MAX)

[terribleturner]

Adi pushed 308 rwhp while mine was 300 rwhp (301 MAX)

Yeah that'ss not a difference to be worried about imo.

[wkdtime]

Im a little confused, a J spec manual TT BPU 300 at the wheels? surely it has to be around 360+? or am i missing summit here?

[letmeshowyou]

I suspect you'd need to go a little further with the BPU to get to that sort of figure!

[imi]

Im a little confused, a J spec manual TT BPU 300 at the wheels? surely it has to be around 360+? or am i missing summit here?

 

With a BPU one should expect 380-400 on the fly... so I would expect 320-330 on the wheels from a manual

[bignum]

With a BPU one should expect 380-400 on the fly... so I would expect 320-330 on the wheels from a manual

sounds about right, im getting 360 @ the wheels, but i have the same problem, cant get the boost too 1.2 using a bleed valve so ?

[imi]

360 on the wheels is pretty damn impressive for a BPU....considering that you are not even hitting 1.2bar...

[Homer]

Mine at SRR has varied as much as 40rwhp. 360 is the highest, 318 the lowest. Same spec on both runs, same air temp, same boost (1.1 bar), etc

[imi]

Mine at SRR has varied as much as 40rwhp. 360 is the highest, 318 the lowest. Same spec on both runs, same air temp, same boost (1.1 bar), etc

 

 

Fair comment. Burt pointed this out and I agree.

 

Still a bit puzzled at how Adi's Auto pushed 310rwhp being an Auto with VERY similar mods...

 

Seems like there isnt really a simple answer to this, so I'll have to get it checked out - at the very least, I would like:

 

- the car to push 1.2 bar without problems

- figure out why the SAFC reads -9 >-15 mm HG, while my boost gauge and boost controller (AVC-R) read ZERO at ignition on.

[terribleturner]

Imi there have been quite aa fair few dodgy baatches of the SAFC2 going around i belive. How long has it been plumbed in??

[imi]

Imi there have been quite aa fair few dodgy baatches of the SAFC2 going around i belive. How long has it been plumbed in??

 

Since I got it....

 

Also, I have noticed that the AVC-R reads upto 1.19 boost on that day, however the SAFC only reads upto 0.84 ....how can that be?

 

now I know that the SAFC has nothing to do with boost at all, still interesting as to why it should read different when the ignition is in the ON position (so engine NOT started)- and then at full chat it doesnt read the same as the boost controller > 1.19.

[terribleturner]

Imi, empty your inbox

[supRo]

Hey Imi,

 

As I've said before mate I'd take it to Thor.

 

They have the proper equipment to test out wastegates, actuators e.t.c.

 

What about damaged turbo blades??? Can that limit your boost?

 

Ro

[Wez]

Noticed something interesting that perhaps some of you may be able to help with. Ive got a SAFC and a AVC-R - both read pressure. when i switch the ignition to ON. the AVC-R reads a pressure of ZERO, while the SAFC reads -9 > -15 mm HG

 

why is that?

 

Are these number with the engine running or just ignition on, if its with the engine on then maybe your boost controller only reads positive boost but the fuel controller also reads vac.

 

Just a guess as I have not used either device

[wkdtime]

With a BPU one should expect 380-400 on the fly... so I would expect 320-330 on the wheels from a manual

 

 

 

Thats a huge loss isnt it? i would have thought that 1.2bar would see a healthy J spec to around 380+ atleast and to around 340 at the wheels? atleast thats what alot of people on here quote.

 

 

Ah ok, just read your not really reaching 1.2 Bar, i dont see how it could be the restrictor ring stopping you from reaching 1.2 as the boost controller would overcome this, Maybe a faulty boost controller? i'd disconnect it and temporary install a bleed valve (which cost next to nothing) and see how that works.