Does anyone know what the maximum boost a TD04 turbo can take?

I'm only asking because my car has been mapped before but I don't know to what boost level.

According to my electronic boost controller it works fine at 1.1 bar but it would be nice to run it at 1.2 bar instead so I'd like to know if it's safe to increase it to that.

 

i'm sure most mappers map td04 to 1.25bar.
if you increase without mapping i'm sure your fueling will be out,that wouldn't be good

hope this helps

 

It's not what the turbo can take, but everything else.

If it's not mapped correctly, something will give...though not the turbo, unless it's already on it's way out.

 

great thanks for the help. I'm hoping it's been mapped well before (it was done at Zen Performance as far as I know). I will try it at 1.25 and I'll see how I get on.

I would have though that it would hit fuel cut before any damage is done to the engine hopefully?

 

No........fuel cut is only due to overboosting. Depending on what it is set at on the PCF.

You will not know if you are running lean > increase Temp > Det > new engine.

 

Probably best I take it to a good rolling road so they can check my air/fuel ratio and if any knock?

Anyone know of a good rolling road in Buckinghamshire?

 

if it's not been mapped above 1.2 fuel cut off will kick in a few seconds after hitting above 1.2. my td04 as been mapped peak 1.4 holds 1.3 till turbo runs out of puff @5k then drops under 1 @ 6k. just bought new VF34 and fuel pump to keep max bar to redline.

 

You have the old WRC tech rolling road on Silvertsone circuit not far away, can't remember what its called now!

Simon

 

Keep it at 1.1 bar, your electronic boost controller will not control the more vital elements, ie the fuelling as already mentioned, which is more important as you dont want an engine rebuild.
Basically forget things like electronic boost controllers, waste of time and money, your better off with a remap which guarentees you safety.

Tony

 

I strongly agree, it's not worth the risk. I had my MY99 mapped by Bob Rawle and mine peaks at 1.5 bar then drops to 1.3bar. This is by far the safest route. I know these cars are getting on now, but, they are still so damn expensive to repair when they go wrong.

 

Thanks for the advice everyone. Will not run it above 1.1 bar for now. It definitely runs better at 1.2 bar than 1.1 bar though. Maybe a rolling road with knock detection could confirm whether it's safe at 1.2? - Then I won't mess with the electronic boost controller again :-)

 

Depends on the ECU: if it's still using the MAF, 1.2 bar should be fine; if it's not, you want to be very careful (boost is irrelevant for fuelling - it's airflow - and a MAF takes the change in airflow into account whether it's higher boost or better breathing, whereas a non-MAF system that calculates airflow via manifold pressure, air temperature & engine VE so is more susceptible unless mapped specifically over the maximum expected MAP which I suspect Paul did, but couldn't say for sure!).
Slap in a knock meter anyway - always good just in case you get a dodgy tank of petrol!

 

Ah I think I understand, so if it's running a MAP instead of the original MAF then there is a danger of it running lean if the boost is increased. Whereas if it's running the MAF, the ECU will calculate the Fuel/Air ratio more accurately?

I'm pretty sure the MAF is still being used, as it's running on an APEXI Power FC which uses the MAF as far as I know. Also, I can locate the standard MAF in my air filter so I guess it's still very much being used.

I always run it on Tesco 99 Ron anyway to help lessern the chance of running lean. When I first bought the car I put 95 Ron in it and the check engine light flickered like mad when I accelerated, which I believe the Power FC does if it detects knock. It stopped doing that when I fuelled it with Super unleaded. A proper knock sensor sounds like a useful thing for me though.

So do you think I'll be safe on 1.2 Bar nom?

 

Looks fine to me! As you've got an APEXI it's very likely on the MAF as you say, and you've got the CEL as a knock meter (it's always good to have a backup but you should be ok with just that by itself), so I'd say give it a go - try it at 1.2 using your usual fuel, keep an eye on the CEL & see if you hit boost-cut or not! Assuming nothing is wrong, TD04s are very happy at 1.2bar, so is the engine.

 

Great thanks! I will keep an eye on it and have set my boost limiter so it won't go above 1.2. It ran fine last week at 1.2 with no CEL flashing at all! :-)