Green XL aka 76HTA

[5150DSM]

Looks like whoever built it put a Red compressor cover on it by accident. You got lucky that should have been a $200 upgrade.

-Michael

No bullshit Michael. I'm totally willing to pay for the cover. You guys have treated me great and I wouldn't want to try and get over on you guys at all, even by accident.

 

[5150DSM]

Now I'm even more curious about what to expect from this turbo. I wonder what sort of effect the upgraded cover is going to have. I guess it's time to start reading up on surge ports and "flow advancement".

 

[AK Maniak]

Now I'm even more curious about what to expect from this turbo. I wonder what sort of effect the upgraded cover is going to have. I guess it's time to start reading up on surge ports and "flow advancement".

Well all I can say is that this turbo should come with a big warning label. "May cause loss of traction and severe puckering of asshole"

 

[phunny]

The red is a nasty machine, one of my goals for the year is a 9 second pass on her, on real street tires.

 

[TJCTalon]

From what I've learned surge ports actually hurt peak airflow. As some air is basically bi passing the compressor wheel

 

[Michael@FP]

No bullshit Michael. I'm totally willing to pay for the cover. You guys have treated me great and I wouldn't want to try and get over on you guys at all, even by accident.

Ha no worries man it might have been the builder couldn't find a 3" cover and just said screw it and put on an 84MM cover.

-Michael

 

[5150DSM]

Just a quick update. I'm in the process of tuning the car after finally having got it on the road and everything (mostly) working right. Yesterday during a full throttle pull... I got 48.9 lb/min of airflow from the DSMGreen XL (76 hta) this was at 23psi, 18 degrees of timing, 12.5:1 AFR on E85 and peaked at 7426 rpm. I started building boost about 1900-2000 rpm and got full spool about 4100. The car never stopped pulling all the way up, I had to let off before the 7500 rev limit. I imagine with a little more boost, I should be able to get all of the 59 lb/min that is advertised. Duty cycle on my 1200's was only at 65% but I ran a little lean up top and would like to tune a little more conservatively. Next stop is 30psi and a shit-ton of power.

 

[Black95TSIawd]

So, airflow wasn't dropping at all until 7400? That's awesome. Can you post a screen shot of your log?

 

[project98dsm]

Just a quick update. I'm in the process of tuning the car after finally having got it on the road and everything (mostly) working right. Yesterday during a full throttle pull... I got 48.9 lb/min of airflow from the DSMGreen XL (76 hta) this was at 23psi, 18 degrees of timing, 12.5:1 AFR on E85 and peaked at 7426 rpm. I started building boost about 1900-2000 rpm and got full spool about 4100. The car never stopped pulling all the way up, I had to let off before the 7500 rev limit. I imagine with a little more boost, I should be able to get all of the 59 lb/min that is advertised. Duty cycle on my 1200's was only at 65% but I ran a little lean up top and would like to tune a little more conservatively. Next stop is 30psi and a shit-ton of power.

These numbers seem to be very close to mine, if I remember correctly. I'm going to hop on my other laptop and try to pull up my last 3rd gear pull when my car was being tuned to see what they are. I'll post mine. Stand by...

* Airflow: 44.7 lbs/min
BoostEST: 23.8 (both mechanical boost gauge and HKS EVC was showing 22psi)
Injector duty cycle on FIC 1150cc: 66.1%
Timing: 8*
AFR: 10.8

This was on 93oct. My tuner and I were working through several issues while street tuning. I will be soon be switching to SD or at the least a MAP sensor to log true boost. My Walbro 255 was also not rewired at the time so I was more than likely losing fuel up top. I'm about to switch to ECMlink full version and get retuned on 93 after I rewire, along with a C16 tune. Mods in profile are up to date, and yes I know I am going to need a larger intercooler than my current ETS street core.

 

[5150DSM]

So, airflow wasn't dropping at all until 7400? That's awesome. Can you post a screen shot of your log?

Actually, airflow was still increasing... The mild port work I did on the head and intake manifold seem to have increased efficiency across the board. I'll see what I can do on the screenshot, I have problems uploading from my laptop. The damn thing works fine for 'Link but being that it's 13 years old has trouble with the modern internet.

 

[Black95TSIawd]

I'm liking what i'm reading as I have my eye on both the green XL and the FP red. The difference being the compressor cover and turbine wheel. The only concern on my mind is back pressure. The red should spool a bit later and backpressure shouldn't be too much of an issue. But, that also takes away fun factor as midrange makes for a great street car. Ahh, decisions decisions. Buying a turbo is not cheap and I want to make sure I get the right one the first time.