TB993tt

Thought 997tt owners may be interested in this thread - the GT2 and tt intercoolers are the same AFAIK....

https://rennlist.com/forums/997-gt2-...tercooler.html


OK, my money has gone where my mouth is and my cores are at the fabricator having the end tanks made.
Just to recap my cores were designed and made by a UK company who supllies current Formula 1 teams with radiators as well as Eurofighter my goal was to get intercoolers which were as effective as Secan (Porsche MS supplier) but at half the price, these will end up around half the price but that is aided by the bad Euro/£ rate we have currently.....

The bits one can see on the cores is that they have 14 channels for the boost air to flow through and 15 for the cooling air to flow through, this seems to be more than other budget intercoolers for the 997tt but is the same as the Secan units which "hopefully" means the math came out the same ....

I have a Durametric reader en route from the US and am hoping the '08 software will read my '09 model without problems. I will do some runs with stock I/Cs and then with my new units - the results will be shared warts and all and may encourage other vendors to do the same however I doubt it.....

Likemystoppie?

How much do they weigh compared to the OEM's?

TB993tt

Dunno yet, I haven't got hold of them. I will weigh them when I get hold of them. I would expect them to be heavier than OEM (bar & plate with metal not plastic tanks) but quite a lot less than the budget 997tt intercoolers out there which weigh a tonne....

TB993tt

Cross post, finished items

TB993tt

Cross post for those interested:

Final testing on stock intercoolers before new units are fitted....

22-23 Degrees C today so quite warm for the UK, I managed to get the engine nice and hot with quite scary results.

Check out the crappy excel graph below:

at the limiter in 5th gear saw the IAT at 62.5 degrees C
this is very high, 40 Deg C above ambient and for sure timing pull so plenty of room for better intercoolers to give some free hp....

I am hoping for my new ones to come in around 20 degrees C above ambient under same conditions.

TB993tt

They are weighing in at 3.76kg (8.3lbs) ea...

TB993tt

Intercoolers installed - initial testing:

TB993tt

Here is another one.

The IAT can change depending on how much airflow one has previously had through the cores. In the one below the car was allowed to idle for 10 minutes and had an initial IAT of 33.7 degC which can be seen at 30kph, the speed rises at WOT starting in second gear, once the airflow started the IAT dropped slightly then rose again as the big load came in up to maximum revs in 4th (about 230kph) then into 5th gear briefly.....

TB993tt

Cross post for those interested:

Intercooler testing at RS looks like it is out of the window....

I have trialled an ECU tune from an unnamed company, said to be German 25M Euro/100 employee, use engine dyno......

My IATs at full loads are now high but the performance is most certainly apparent.

I got 0-300kph in 26.3s with an IAT of 48.7DegC (22 degC ambient)

There is no doubt in my mind that this intercooler is allowing this hp to be produced after watching the standard intercooler IATs, this new tune would be a heat soaking pile of junk but by a stroke of luck it seems to work rather well with my modifications...... I still can't quite believe the numbers - this is 0.2s faster than the Wimmer GT2 which claims 650PS/830NM and that was tested in the winter !

eclou

there may be some kind of 4th gear data anomaly there. The run time in 4th is much shorter than the other gears and you are pulling more g's in 4th than in 3rd. Nitrous Toby?

Red9

TB - can you spellout in summary the findings so far and what they mean for the technically dislectic( me!) Thanks.

TB993tt

Gene, I am guessing you mean that "blip" in 6th gear which gives a high long G briefly accompanied by a steepening of the acceleration curve ?

I'm not sure what caused that but I am confident in the numbers, I have done plenty of these high speed runs and this thing absolutely ripped up through 6th gear, it took very little distance on the test track and I saw 188mph come up on the GPS with 193 showing on the speedo....

TB993tt

Red
I am cross posting all this to the GT2 forum.....

This is an "interesting" ECU tune, the mid range torque feels around 750NM but it then feels quite a flat torque curve meaning power builds steeply all the way to the limiter. I observed 1.3bar from 5000rpm to the limiter

This relatively low peak torque means the clutch is not slipping and I really feel that I prefer it to the 800NM slug which I'm not sure suits the set up of the GT2.....

Remember the IAT numbers I was getting with stock intercoolers and stock mapping ? there was 62 degC IAT in 23 DegC day at just 170mph.

Well this new mapping would send the IATs off the scale with standard intercoolers - it is these intercoolers which are delivering the real power, no question about it, the IAT was 48.7degc at 302kph (22degC ambient) after 23s of full load, seems high but with the expansion manifold cooling the combustion air further they are making real hp......

This is making me think further about some of the claimed hp numbers and what they really are once they are on the road ? It is a question of how do you measure the hp numbers, even on an engine dyno ? the iAT is so critical and for correct hp measurement the IAT should be simulated to what is seen on the road at (DIN 20DegC ambient) at near maximum speed.......

TB993tt

IATs for the 300kph run:

eclou

max IAT under 50C. I think that the threshold for the ECU to retard the fun is 55C. Nice!