Check out this thread.

SBR has begun taking all sorts of turbos and running them on their dyno at different boost levels and posting results. Its a good read, and the V-trim is on the first page.

Does anyone have there own dyno results, I am going to the dyno here pretty soon and I wanted to get an idea on what I would probly see.

Were those times that they did with awd?

With the mods in my profile what should I set my boost to. If I were to take it out and keep turning it up until I see knock do I want all timing set to 0. If I do this though will we not be able to advance timing while on the dyno.

Thanks,
Krummel21

Well I got back from the dyno, 234 awhp and 212 ft pounds of torque. This was all done on a very conservative 18 psi which isn't in this turbos efficiency range. It wos also done on a mustang dyno which is not a dynojet. If it were I woould have put down 260 awhp.

Is it me or do the numbers I put down seem low? I was expecting something alot clotser to 300 awhp. What am I missing in my set up?

My first guess would be to check for boost leaks. Some cams would help you out alot as well.
-ADAM-

What does your timing look like? Also do you still have the stock 2G TB and intake manifold?

Yes I still have the stock throttle body and intake manifold. Would changing these two help me out quit a bit? I want to change out the cams but I don't have that kind of money right now. I will see if I can't show you the timing but it's retarded quit a bit throughout the whole band. I'm thinking about retarding it some more and turning up the boost.

wow krummel you were having a little convo to yourself for a couple months there. But yea those #'s do seem a bit low, hmm. i would really like to see what cars are running at the track with these turbos. You see dyno charts and videos of these all the time but never a track video or timeslip.

I would recommend leaving the boost were it is and adding more timing (is you can). The V-trim is not a high boost pressure turbo. 18psi is a really good spot to run it on the street.

You can see here what this turbo has made at different boost pressures:

http://www.turbochallenge.com/rocky.htm

so if somone uses a MBC with that stupid actuator it wont open and go retarted like that dudes did?

Well I actually have the high pressure actuator arm and not the low pressure. Which with that known the turbo is underneath it's efficency range which is probly closer to 23 psi. Instead of 18 like his since he had the low pressure. Forgot to inform everyone of the high pressure actuator arm.

how do u tell the differnce between the two? ive noticed most people have the actuator with the nipple that comes out at an angle whereas my actuator has the nipple directly out the top and center of it. If thats not a sign then how do i tell?

I've atcually never compared the 2, alls I know is that when I ordered mine from bullseye I specified high actuator arm (12-32) or something like where as the low was (5-20) I think I'm not real sure on the psi's. But If I were to keep or even retard the timing some to turn up the boost to 22 or 23 and put the turbo in it's effiecency range. What is the knock count I shouldn't go over? I was thinking 5 or is this to much.

personally i tune to never go over 7 counts of knock. Dont know about anyone else but i take that as an acceptable # and nothing has happened yet. Usually if i do happen to hit that high up the knock count drops off some by redline to like 3 or somthing anyway.

krummel21 said:

Well I got back from the dyno, 234 awhp and 212 ft pounds of torque. This was all done on a very conservative 18 psi which isn't in this turbos efficiency range. It wos also done on a mustang dyno which is not a dynojet. If it were I woould have put down 260 awhp.

Click to expand...

Using 10.5 hp = 1 lb/min airflow, you're on the surge line.
How much horsepower do you get if you raise the boost to 25 psi? Have you tried this on the dyno? If it nets you significant power then it will pull from the surge edge and of coure give you a more efficient charge as the charge temps will go DOWN actually yielding a better pump gas tune. It would be like adding a bigger intercooler in most respects. But that is ONLY IF you get off the leading edge of the compressor map. Do you have an E compressor cover or a B compressor cover? An E cover would significantly change your efficiency and draw you from the surge line, IMHO.

BTW, tune for zero knock when running pump gas. You don't have total control over the grade of fuel you put in your tank, your climate, or your mistakes.

If I'm understanding you right, you recomend that I turn my boost up to around 25 psi and retard timing so that I have little to no knock. by doing this I would increase my horsepower by 73.5 horspower to the crank or wheels? Also I don't what compressor cover I have, how would I find this out. I did purchase this turbo a while back. Will the toques increase at the same rate? What does it mean to be on the surge line is that good or bad?

Yes. Who knows what horsepower number you will end up with. Hopefully it will add that much. If it does, then you will be in a more comfortable place on the efficiency profiles on the v-trim compressor map.

Surging means just as it says: your boost randomly jumps up and cannot be tuned properly w/out retarding your timing or leaning out to make up for the transitioning. "Transitioning" is the curve of airflow from one bost level to another. When you transition RAPIDLY, there is little you can do to prevent knock. Most ecus and fuel controllers cannot tune this curve discrepancy properly... It is called spiking in some circles.

I don't know how to find out what cover you have other than going back to the manufacturer. Is it bullseye? They have great customer service. Call them. I have and I havn't purchased anything from them directly.

Since it was tuned in this area do I need to worry about the fuel when turning up the boost. Cause usually it's just timing that you mess with. If I do have to mess with fuel then I'll probly have to take it back to the dyno.

Only you (and your dyno tuner too) will know when you dyno this again... I don't think you should use your dyno shop anyomre... Guys have dynoed ALOT more w/ less running the v-trim. SBR has posted what this turbo can do... If a dyno shop can only tune a turbo to the surge limit but not at tell you why your setup is falling short, then you need to take a hike. . .

All the V-trims have T04B compressor covers.

Thanx. I was under the impression that the E cover could be used as Alot of other B wheels are using the E cover nowadays.

I went and retuned what the dyno shop had done while doing so I noticed one real big thing, they had the global set to 580's. I went back out with the knew settings and according to dsmlink (which I set so it got the same numbers as the dyno so I know it's almost exact) I hav 303 hp and 302 torq at the crank on 16 psi. I just got a wideband so I'm to do a lot better tune this wekend and turn up the boost.