AAZ - Rocco superbuild

[dirtydiesel]

never got it dynoed i kept breaking stuff. but i can say i will dyno it as soon as the block is broken in. the trap speed with a launch from 2000 rpm (didn't want to break anything drove the car to the track 250km drive) . the trap speed was 103mph i plan on dumping the clutch at 4500 rpm this summer  and getting good 60 foots. gotta go for broke now. goal is low 12's with slicks and weld racing rims and lots of practice at the track to get dialed in.

the turbo is a t3t4 hybrid. no big brand name bushing type turbo. cold side AR 50 and hot side AR 48.

http://www.flickr.com/photos/jehson_/5244819555/

http://www.flickr.com/photos/jehson_/5245352242/

http://www.flickr.com/photos/jehson_/5239832782/

http://www.flickr.com/photos/jehson_/5239232075/in/photostream/

http://www.flickr.com/photos/jehson_/5239779612/in/photostream/

http://www.flickr.com/photos/jehson_/4445576971/in/photostream/









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[dirtydiesel]

So, since the owner is here. What was dyno numbers and trap speed with old setup?

I never got dyno numbers as no one in my area had the equipment to dyno a diesel.

my trap speed was 103mph.

launches were at about 1500rpm(a very light launch so i didn't break anything..)

but with 45 PSI out of this turbo i ended up breaking things anyway.

new numbers soon, and more track times after this canadian winter is over.

[vanagonturbo]

Nice to see another rocco TD built! Keep up the good work man! :beer:

here is a shot of mine:

[vanagonturbo]

just noticed this pic. I am not sure if you knew it or not but the engine mount has been installed upside down in the bracket..

[MJF]

So, since the owner is here. What was dyno numbers and trap speed with old setup?

I never got dyno numbers as no one in my area had the equipment to dyno a diesel.

my trap speed was 103mph.

launches were at about 1500rpm(a very light launch so i didn't break anything..)

but with 45 PSI out of this turbo i ended up breaking things anyway.

new numbers soon, and more track times after this canadian winter is over.

You got same speed that I got with my Scirocco That was with sloooww 2,4 60 feet with street tires and no traction... Time was 14,5 then... Here is one start at that day: http://www.youtube.com/watch?v=pHGeFUcBda4
Why so huge boost? You can get nosmoke power with lower boost. 

[Smokey Eddy]

Big turbos aren't complicated. i want to know how you're fuelling it because im at the limit on my pump right now...

[dirtydiesel]

I have a super Giles pump with a 12 mm head . 3 inch custom built exhaust  by me and Lindsay . No waste gate and no smoke just a light gray haze , Giles built my pump for boosted fueling 40 psi plus  to achieve a smokeless burn .

[MJF]

Why are you not using wastegate Iīd say youīll get same power with ~30psi and not breaking everything with that huge boost   What does your Scirocco weigh? Mine was heavy with 02A transmission, full interior etc, 2120lbs... Did you have slicks with that 13,5s run? Doesnīt that mesh in turbo inlet limit airflow?

[dirtydiesel]

the air flow meter screen is my air filter. and my car became very explosive from 38 psi and on. it did not have the same pull with only 30psi boost, so i got rid of the waste gate and tried it out and was pleasantly surprised. One more thing with my boost at 45psi my EGT is only 1300 thats the hotest i can get it. so it was a much needed thing to do.if you can match your fueling to your boost go for it. i always say. My car with street tires when i hit boost in 2nd and 3rd gear the car will spin until i shift it or fuel cut hits what ever i do first. the giles cam shaft regrind and the higher boost made it come to life the way i want it.

[MJF]

Maybe it was becouse pump didn't give full fuel until 45psi? That was just my experience from 200whp idi, got more power when dropped boost from 33psi to 29psi. Ofcourse, that was only from buttdyno, didnīt make to wheeldyno before it exploded...
Have you measured EMP?

[RadoTD]

I don't know why some of you keep saying you'll make more power on less boost? Assuming his turbo is efficient enough at that pressure ratio, more boost will shove more air into the cylinder. Yes, it takes power to compress that, but you do get most of the energy of the compression back
Why wouldn't more boost make more power?

[theman53]

I am trying to get my head around it. I think it has to do with higher pressure will "sometimes" mean that the air is hotter coming in, even intercooled. Hotter the air the less volume of O2 in it. That would translate into less room to fuel so less power. Sounds like OP above hadn't got to that point yet

[Aki-76]

jep,less boost donīt mean less power all time...

[dirtydiesel]

True my water meth made a huge difference when I went to the second largest nozzle . Wow is all I can say.

[MJF]

Is new engine running yet?