My TD04-13T Build

[fassi1]

I would say 11s are are bit too rich.
12-12.5 is perfectly fine and safe especially with standard ignition timing. It's a lot safer to make sure that all the fuel burns in combustion chamber rather than ignite outside of it.

[Davezj]

Thanks for the graphs Lauri. What fuel are you using? I have been told that 11.5 is where you should aim on wot for safety. You seem to have aimed at 12? I think that might improve power a little but at the expense of a little safety?

i think he is on E85 so it is much more knock resistant than plain old petrol so AFR's can go higher without running into detonation.

as far as i understand it the only reason you use an AFR that is on the rich side of about 13AFR is to combat the knock. if there was no knock in the engine then you would get more power at 13AFR than you would at 11AFR.

[lateshow]

I am using E85 ethanol which allows me to aim for 12.2. The actual amount of fuel is 30% larger than with gasoline. Optimal AFR for ethanol is 12.5. This requires a good spark due to amount of fuel. I can also have much more advance than with gasoline. I think that with gasoline I would have 30-40 bhp less power?

After dynoying i went back to standard air box and did a load and virtual dyno log that proves that turbos spool faster with stock air intake. Not much difference in higher revs. For comparison Anders has 19T turbos and his setup spools about 200-300rpm later than mine when i used my custom intake. Now i must be 500rpm faster.

I personally would like to have an increasing power curve. Not a fan of big ass low torque and even with better clutch and forged engine the drivetrain would be next to go.....

[Davezj]

that is fair enough,
it is nice to get some first hand experience.

[rajvr497]

That power is rated @ the flywheel not so?

[lateshow]

Cannot understand your question? We have better dynos here in Finland which actually can determine flywheel power quite reliably. Actually the power loss was about 22% which sounds quite reasonable for a MT vr4. Max wheel power was 268kW.

[Davezj]

I think raj is saying

Either his figure is at the road wheels 284hp
Not at the fly wheel.

Or he was asking if your figure was at the fly wheel or at the road wheels, and you have answered that question above.


Sent from my space-aged gizmo

[billybobboot]

Davezj i think you missed my reason or i forgot to add it due to the pressure in the cylinder due to too high a compression ratio im timing has been put almost right back.
There are 3 options
1 lower the compression by putting on thicker gaskets
2 up the fuel octain
3 run a diffrent fuel mix e.g. get water meth injection or run gas than petrol ect

By putting thicker gaskets in i can lower the comp ration run the correct timing and get the power back up. Im effectively running a bit like an na car with turbos put on can only run so much boost before you blow a hole in piston (the answer) lower the comp ratio 1 new pistons or w thicker gaskets. As im running a turbo car its got low comp pistons.
So yes but thicker gaskets i can get 50-80 at the wheels as everything elts is set up to run over 400 if the internals can handle that.

[billybobboot]

It was knock holding me back but i dont want to run water meth mix spray as if im away driving hard and run out i dont want to be carrying extra all the time or worries about checking it.
Thicker gaskets with help this as im stuck to using 97 oct rather than 99.

[Davezj]

I was only saying what I have been told and reviewed that thicker head gasket have there own issues with respect to knock .
It is not a fix all when it comes to knock.


Sent from my space-aged gizmo

[lateshow]

In my opinion knock isn't a problem in the high end rpm where max power is achieved. Bigger problem is the flow itself. Something should be done to the heads.

[swinks]

External wastegate (which is problem with internally designed TD04), or just screamer pipe will help to keep power and boost curve up to red line.

[TrEnD$eTt@]

any updates on the progress? power figures? i've been following this thread closely .and its actually the blue print for my 13t build .however im attempting to go with twin tial 38mm ext wastegates and custom turbo manifold .

[Kryton]

Good luck with the screamer pipe in the uk. I had one for a week with my td04 conversion before attracting unwanted attention lol

[elnevio]

Good luck with the screamer pipe in the uk. I had one for a week with my td04 conversion before attracting unwanted attention lol

Hooligans usually do!!

[Kryton]

Hooligans usually do!!

Me, with my reputation? I think not. Generally saying 'it wasn't me officer' then pulling off without hitting boost is the only option I'm a great lover of the electric exhaust cuts these days for incognito mode. Flick of a switch & the hemi is whisper quiet & they can't prove sh!t...or so I hear anyway

[Anderz]

Sorry no powerfigures still Would guess that is is around 450-500 hp now, but it is not tuned on a dyno. Needs more ignition advance at least.
The sayc diff gave up, so had to change that, otherwise not so much progress. Need to change the valve stem seals and install COP ignition during the winter. Then there is some problem with fuel pressure although I have AEM 320 pump and AEM FPR. Will probably build a dual feed rail. Problem is at this moment I have no garage to build the car.

Lauri has tested his car more, and it seems to be limited by something to 500 hp. Have planned investigating MAP control, if the maf is the limitation.

[TrEnD$eTt@]

kryton...any pics of the manifolds with the external gates fitted ? seems to be a bit of a pain to position them....

[rajvr497]

Twin gates shouldn't be that hard to install.....would be more up to the fabricator who's doing the manifolds to fab the wastegate inlet,also an aftermarket radiator and slim fans will help alot you will gain like 1.5'' more clearance between the manifolds and fans.

[Kryton]

kryton...any pics of the manifolds with the external gates fitted ? seems to be a bit of a pain to position them....

Afraid not as the car is long gone but the setup is still in circulation I believe. It was installed on to Colins car