Project: RS2 ABY

[Rusty]

Asked in another thread but what about just using 2 IM gaskets as a cheat's way to isolate things a bit more?

[A80Avant]

Only trial and error if you'd see a difference.

In heatsoak matters the phebolic spacer really does work. I could see a drop of >10C when compared to the Wagner manifold without the spacer. One of the best things I have ever fitted on the car.

Having said that, the OEM IAT sensor does 7C jumps in temperature and motronic knows that. Perhaps it may not have been that big of an issue with motronic as it was with vems and the 1.8T sensor which measures temp. By 1C steps.

[Rusty]

True. Guess it's also trial and error how much the extra section of the spacer would affect the flow to the inlet, the injection of the fuel and the how the height would affect the rest of the system... Worth a try I think, ATEOTD, it can't make the IM any hotter and will only add a mm or two to the height.

[A80Avant]

True. Guess it's also trial and error how much the extra section of the spacer would affect the flow to the inlet, the injection of the fuel and the how the height would affect the rest of the system... Worth a try I think, ATEOTD, it can't make the IM any hotter and will only add a mm or two to the height.

I couldn't see any problems before and after fitment on mine. Didn't have to alter anything on the map

[4WheelDrifter]

The injectors are aimed at the back of the valves, so a spacer would mess with that.

It does sound like a percolation problem, as anyone who has run a blow through carb system or two will know about. Only there's no float bowl to worry about. Could the fuel rail get that hot?

[A80Avant]

The injectors are aimed at the back of the valves, so a spacer would mess with that.

It does sound like a percolation problem, as anyone who has run a blow through carb system or two will know about. Only there's no float bowl to worry about. Could the fuel rail get that hot?

Ok. So it would mess with that. Sprey pattern would be shifted slightly further away from valves. Effect?

Judging from the fact that in the old days they used to put more injectors well away from the actual original position in order to get more fuel for larger turbos and everything worked fine, I'd say the spacer wont do any harm whatsoever.

These slavers are being sold and used in rs4s at will on high powered and modified cars again with no issues.

[driftin jo]

How thick is the stock gasket, 1.5, 2mm ?
Just get some 3-4 mm PTFE sheet and make a gasket out of that, you will not need a gasket either side as it will seal good as it is so hardly any movement in manifold position at all.
Having said that, its fckin expensive stuff PTFE, although I could 'borrow' some from work if anybody wants to try it.

[4WheelDrifter]

I don't think a spacer would do any harm, just possibly make the fuel dispersion in the intake sub optimal. But if it improved the running of the car when hot, then obviously it would be worth doing.
Injectors placed further from the head are usually in addition to the stock location, and often only used at higher boost/rpm levels.

[Zoig]

I understood that the fuel itself should cool the injectors and fuel rail, afterall there is significant flow trough the FPR back to the tank + the ammount that gets used trough injectors. I'd try heatshielding the injectors or try to cool the fuel lines running under the car if indeed the fuel does get hot, i've seen heatsink or similiar under B6 TDI, airflow passing by should be more than enough to cool the petrol whilst car is moving.

[Rusty]

How thick is the stock gasket, 1.5, 2mm ?
Just get some 3-4 mm PTFE sheet and make a gasket out of that, you will not need a gasket either side as it will seal good as it is so hardly any movement in manifold position at all.
Having said that, its fckin expensive stuff PTFE, although I could 'borrow' some from work if anybody wants to try it.

I'll give it a go

[Rusty]

Fuel rail and injectors are matt black... which absorbs maximum heat. Chrome plate or even silver paint will repel heat much better

Does the IM get hotter than it's surrounding air? Could paint that matt black...

[Sonic]

By the end of the day the metal cover to the fuel tank in the back of the car was very hot to the touch which struck me as unusual.

Heat soak does seem like the likely reason, and it certainly felt that way because of the way it struggled to start after leaving it to sit whilst hot.

Ultimately i ended up doing 2-3 cool down laps at the end of each session, so probably like 10 minutes of cruising which saw the oil and coolant temps drop back down to their normal 90, but even then would leave the bonnet open to cool things further.

[Rusty]

150 sounds very high. Even in 30deg heat, mine hit 130 on stock cooler, 135 max.

[martinws]

By the end of the day the metal cover to the fuel tank in the back of the car was very hot to the touch which struck me as unusual..

A fuel cooler on the return line might be an idea. Fuel must have been roasting to cause that tank cover to heat up. Could fuel evaporate in the lines and filters cause problems?

[andy10v]

Could this be anything to do with the 10bar pump?