I recently upgraded my 20VT with this parts:

- Garrett GT2560R (aka GT28R)
- stainless steel manifold
- new 200 cell cat
- front mount intercooler
- fuel pump walbro 255 liters/hour
- double inox exaust (only terminal section)
- turbo pressure settings: 1,4 bar peak - 1,2 bar constant
- cotton air filter

and here the power graph at the live mapping

http://s778.photobucket.com/albums/yy66/kemical1138/?action=view&current=livemappowergraph2.jpg

http://s778.photobucket.com/albums/yy66/kemical1138/?action=view&current=DSC_3404r.jpg

waiting for your opinion and suggestion....

thanks

David

The graph is very blurred, can't tell what it says. Anyone else?

Looks fine my end. I think a trip to Specsavers for you Joe, lol.

Joe open it on a pc. its a little blury on my phone

how can I post it directly on the forum?

What tuning chip do you use?

I'll look on the PC tomorrow, must be my phone.

no tuning chip...

live mapping in a specialized garage like

www.fcperformance.co.uk

ciao

Just to confirm, I haven't tuned David's car, but he has had it tuned somewhere local to him in Italy.

Do you have a boost graph? When you say it peaks at 1.4bar, does it immediately drop to 1.2bar and hold this to 6000rpm? I will add some mor ecomments later.

thanks Flea, your comments are welcome!

yes I go in a live mapping specialized garage near Milano

I will also post a video (before I have to find a soft to hide my plate number and the face of the garage owner...)..

I personally see pressure peak at 1.4 and gradually fall to 1.2 going to 6000 rpm

David

235 whp is really low for a GT28R. I saw 240 whp with the original one.
You should get at least 270-275 whp.

Maybe some FC magic can help you

not 235 cv but 288 cv (or 210 kW)

please note the red box

288bhp 335Nm is still low for 28R

near as 290bhp and 250lb ft torque I wouldn't say that's to bad, maybe lacking a little bit of torque up to 4000rpm but the graph is fairly smooth and on the road the power will come in earlier probably as there will be more load than on the rollers

thanks dugh20vt

what I need to understand is if the graph and the power are ok in relation with 1.4 bar peak / 1.2 const

I know that we can go higher with the power...; lots of people in Italy with the same turbo are arount 320 - 340 cv but they have also Ø70 mm exaust and decat...

what price to pay in durability and reliability of turbo??

are you running the completely standard exhaust apart from obviously the 200cell cat and a vband adaptor

i have a stage 3 ball bearing hybrid and i have a custom blueflame exhaust with 70mm downpipe and sports cat and 63mm cat back

for comparison i swapped the exhaust system over and put the standard exhaust back on and the difference was really marked, the car lost about 0.2bar of boost right across the board and felt sluggish in comparison

if you are running the standard exhaust albeit with the 200cell cat you will be strangling the turbo a bit

running a sports exhaust particularly with a sports cat should have no effect on your turbo's reliability

I saw the red box but I think that number is too high. Power at wheel is 235 and that is very low for that kind of turbo and setup. I can't understand why you put so much money (=tuning parts) on your car and not use them. A hybrid turbo would suit your needs much better. It would give you more torque low down and enough power. But that's not an option now since you bought all those tuning parts.

With the setup you have now you can easily get 320 HP / 420 Nm out of it and you don't have to be afraid it will break.

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With the setup you have now you can easily get 320 HP / 420 Nm out of it and you don't have to be afraid it will break.



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thanks Freddan72

I see..
Many here told me the same...

the question is: where can be the problem? it's not only a matter of turbo pressure?
is it possible to see a similar graph or a graph with a similar config?

thanks
David

are you still using the standard exhaust with just a sports cat?

yes, original except the double terminal

http://s778.photobucket.com/albums/yy66/kemical1138/?action=view&current=DSC_3404r.jpg

thank you for your opinions...great help

with all due respect you need to bin the exhaust..it may look good but it's killing your power..you need at least 2.5" exhaust with the gt28r 3" would be better and the dual silencer thing will be contributing to the lack of power..a full blue flame would be a good bet i had one on a similar set up(the 2.75" inc downpipe) and ran near 340bhp and well over 300lbsft on a chip ..you are well down from where you could/should be..unless of course there are other issues?

looking back at your spec you would be better off with a standard manifold in my opinion..i have yet to see a stainless do a better job and it could be that contributing to the lack of power

lots of thanks ktm450exc!!!

as ktm says a decent exhaust system would def help, if you can't afford a full system, then go for a cat back, you should see a fair difference with just that,you would probably get some gain from an uprated downpipe as well but not as much as from the catback

as stated earlier there was a big difference when i swapped my standard exhaust for the blueflame one

If you use standard downpipe then you must have some sort of adapter between turbo exhaust and downpipe. Generally these adapters are not good for power. Make a new 3" downpipe that connects directly to the turbocharger. Here is one example of a 3" DP with 5 stud flange: http://sfk.ibk.se/forum/attachment.php?s=&postid=74880

If you want to compare your result with others then visit FC Performance place on fccuk

Start with the Dyno League. I think you will find a lot of GT28R owners in the list

do you know what power the car produced before the mods were added as it could just be that the dyno reads a bit low

if the dyno were reading say 20bhp/ft lb low then your figures would be 310bhp and 270ft lb of torque which at your boost figures would be a reasonable amount of power for a gt28r, just a thought

thank you Freddan72

thats is right what I was looking for!!!

the formu is very huge and my time not so....

David

next upgrade: 3" exaust but not decat...

at your level of power i don't know that i would be going for a full 3inch exhaust, a well designed 2.5inch system will easily flow what your turbo is capable of producing, a 3inch exhaust is likely to be a lot louder