Likely I'll be shifting to 5th since riding the 7800 rev limiter to 115 mph doesn't make sense. I guess we'll have to treat these like a 6 spd Evo 9 MR when running big turbos because not everyone is going to want to spend the money on oversized tires or taller gears just to optimize 1/4 mile ET's/trap speeds. The stock ratios are already close to maxxed out on a stock turbo so most of us will just have to live with it and know it still hauls even if not optimized for quarter mile performance.

As for spoolup, response, or boost threshold depending on how you want to describe it, much depends on load to determine how quickly boost is built up. The repeatable test of flat ground and starting at 2000 rpm in 3rd or 4th gear gives a rough idea of how it is going to respond during daily driving. I'll report back on how good or bad it ends up being as soon as mine gets installed. That said likely 4th gear dyno pulls done on a Mustang load bearing dyno might show a turbo spooling better than a pull in 3rd gear on a non load bearing dyno.

 

I am going to get the tuners to install this turbo along with the correct injectors and fuel pump (ECUTEK) on monday. I can't seem to find any success stories about it so i have a couple of questions to fire:

1) Are the faults to do with the car, the tuners or the turbo itself?
2) Shall I cancel the upgrade for the time being and pull out?

Please help, thanks!

 

Evo400 in the UK, post #339 seems to be doing fine.

I don't get the problems. Generally, the only 'problems' a turbo will exhibit will be leaking oil and shreading itself to pieces. I'm not sure how a turbo would contribute to driveability problems, etc.

The other poster also installed a lot of other components at the same time, so it's hard to pinpoint where the issue is. Furthermore, the datalogs show he's pushing more air, YET making less power. How does that make sense? The turbo is doing it's job of pushing more air, so I'm guessing the issue is elsewhere.

 

Those are good questions and I'm sure we'll get the sorted soon enough. I'm thinking the UK car has turned out just fine and will be around 500 crank HP soon enough. If the turbos are really "bad" somehow then I doubt Garrett would leave us all holding tbe bag for fear of ruining their reputation forever. As for cancelling the upgrade do you mean delay it until someone else verifies that the turbo does work? Likely I'm installing fuel components this weekend and retuning so that next weekend I have the least amount of variables installing the turbo. It would be great if you completed your install on Monday so that we had another data point. I wish they got a test car and dyno tuned this setup before releasing it to the public so quickly, it would have solved so many issues of doubt we have right now. My bet is that the car having issues has nothing to do with the turbo itself.

 

I say you go for it.

 

Although I trust Garrett i'm just a lil worried... The job on monday is confirmed with the GT3071, Injectors 800cc, Fuel Pump, Fuel Pressure reg being fitted...Stupid question but do I need to add the sports clutch with the upgrade as one tuner said not yet, defn later. The other says I need it so that it can be tuned properly as the stock clutch will not handle the power.

 

You're going to need a wastegate actuator that is stronger than stock too; the Forge unit should work well. As for the clutch... um, if you don't go crazy on the boost/torque, the stock one will hold. Maybe a max of 1.6bar of boost.

 

I don't think you need to swap the cluch if it's still alive. Replace it when it starts slipping.

 

We maxed the stock injectors out at 440hp with stock fuel reg .The clutch will almost certainly die ! Not if but as soon as you give it some boost ! Hell we did the stock unit 3rd run with the Motec with stock turbo !!Was making 430ftlb tho!

 

wow 440hp amazing!!

hmmm, so i should change the clutch when i feel that it starts to slip (cool)

with regards to the wastegate, my cars an import from Japan and apparently they have tested most aftermarket wastegates and it keeps throwing the check engine light warning which causes the ecu to set itself in a kinda protection mode. oh man

 

MOTEC my friend ! Expensive but hey its only a good set of loudspeakers !!The clutch we use now is the awesome BLADE Carbonetic single plate . We use it in the Rally cars ,EVOXSERIES cars and the development cars. Carbon friction plate with a new twist to the design ,hey its the best single we ever used period . Be nice to see some GT3071R results soon.

Dave

 

The parameters in the ecu for boost limits probably just needs to be modified to higher settings. You will NOT get the boost you want with the stock actuator, it's just not strong enough.

 

I thought that turbo was internally gated?

 

It is. He's talking about an upgraded actuator, not the actual wastegate itself.

 

Yes, I'm hoping that if by some small chance that the turbo is the culprit Garrett will make things right.

That being said...I personally think something else is going on with my car, so I don't want people to think that I automatically assumed the turbo was the issue. We (GST and I) are going through the car inch by inch to make sure everything is in order. I mentioned before that the MAF sensor was dropped on the shop floor right before the dyno session while swapping filters.

So, this Wednesday we do a leakdown and compression test as the last step. I've scheduled dyno time on Saturday the 6th and I have a donor MAF sensor to test my theory.

Crossing fingers, I hope I have some good news for you guys.