Calling all V-trim owners! If you would be so kind, could we get a list of lb/min at what PSI and at what RPM you guys are getting? Lists of applicable mods would be sweet too!

Here's my reason for the thread:

23.9 lb/min @ 15 psi @ 5034 RPM as reported by DSMLink. Good grief that's pathetic!

So....what ya'all getting???

what gear are you talking about?

Mine was in 3rd gear @ around 56 mph is where i logged my highest flow. However, any gear will do. This is purely for comparison and gives us a place to put all of our hard data in one thread.

That is quite sad for an aftermarket turbo. That's less than a t-25 flows at that boost level.

yeah really, are you using a gm maf/ maft?

A t-25 would never be able to flow that much. That is well over 300CFM.

Not amazing numbers, but good for 220-240WHP.

After searching around a little more, I realize that t-25 owners have hit over 20lb/min, but all at the boost level the post starter is running.

KeltonDSMer said:

A t-25 would never be able to flow that much. That is well over 300CFM.

Not amazing numbers, but good for 220-240WHP.

Click to expand...

http://dsmtuners.com/forums/showthread.php?t=234306

Not even 10 threads down....

Technically, it's about 340 CFM, With a small16g flowing 505cfm, and numerious logs on DSMlink showing that t-25's flow 23-24lbs/min, I'd believe it if I were you.

Yes, that v-trim should be flowing MUCH more.

I see you have an AFC and dsmlink. Why?

Does it really surprise you that a t-25 can flow the same as a v-trim at 15 psi? If the t-25's discharge is sufficiently cooled and both turbos are producing the same intake temp and pressure, then they are going to flow the same amount. The bigger turbo should have a slight advantage due to a bigger exhaust housing allowing for less back pressure, but not by much. Now you slap a cam in there and 15 psi isn't the same anymore. The Volumetric Efficiency of the engine changes and now the engine allows for more flow. The t-25 is going to have a tough time keeping up 15 psi, where as the larger turbo won't. Comparing turbos on different cars at the same pressure means nothing.

I know I really shouldn't quote this, but here goes anyway:

SlowboyRacing said:

This turbocharger made a nice power number recently, at 10 psi, the turbocharger laid down 302 horsepower, and at 15 psi, the turbcharger laid down 329 horsepower. These numbers are taken on a moderately well tuned car on a DynaPack Dyno in All Wheel Drive mode, boost and timing were kept pretty low!

Click to expand...

http://www.slowboyracing.com/more.php?id=5676&

The turbo should be flowing much more.

Back on topic. You need to check for something that would alter the airflow readings (the S-AFC maybe) of your car.

Did you look at the mods on that engine?
Block:
2.0L
8:8 Wiseco pistons, 87 mm bore
2.0l crank

Head:
SBR stage V head
Manley Valves
Manley Ti retainers
Manley springs
HKS 272 cams

Intake:
1G throttle body
Magnus intake manifold

15 psi on that engine and a relatively stock one isn't really comparable. Anyway, picking over details. It should still be capable of flowing a lot more than a t-25. Crank up the boost.

Thanks for all the responses guys. While this really isn't on topic, I apprecaite your comments anyway. Boosted98GSX, thanks for concurring with me on that my flow rate really does suck.

I'm not sure what is going on with this turbo. I'll post my log here in few moments so you can see what I'm talking about (If any of you can look at DSMLink logs). I'm still in the initial stages of tuning so its a really crappy looking log. I have many issues left to address. As for the SAFC, it would be too much of a hassle to remove it from my wiring harness. I left it in and zero'd out the settings on it. ...Besides, its purty and glows at night.

Honestly, my poor flow rates was (after seeing the t-25 tread you mentioned) was what gave me the idea to start this thread. I wanted to compare my lb/min to what others were running without having to go through 20 million threads. Cams, springs, HG, ARP fasteners, etc etc...is next on my list. My goal initially was to hit around 280-300 whp at 15-17 psi. I wanted to take it easy on my motor and tranny (especially since I am auto and this is my DD).

I'm going to do another boost leak check and see if maybe I've sprung a new one. As always, any comments are appreciated.

V-trim owners, please, still post up your lb/min.

iiiwildfireiii said:

I'm going to do another boost leak check and see if maybe I've sprung a new one.

Click to expand...

If you had boost leaks, your airflow would read higher, not lower.

Point! Gah, I think that repsonse is just ingrained in me from listening to Defiant and Oldman rant about boostleaks all the time. I knew that, really I did. I'm at work and only half paying attention.

Anyway, here's the clipped log where I got my initial lb/min.

DSMLink showed 38lb/min near redline in third gear at about 20psi. This was with a 2g maf and some pretty bad boost leaks so I don't really trust that number. BTW this was with stock cams.

Turn up the boost.

I can't look at the log because I'm at work, but did the airflow increase with increasing rpms? Flowing 24 lb/min isn't THAT bad for only 5k rpms. If you are peaking airflow at 5k rpms, then something is wrong.

Here we go. I made a few changes and did another WOT run and was able to take it up a bit farther. Got 28.3 lb/min @ 6088 RPM @ 15.1 psi. Heh, a bit better! Now...lets add some timing and take out some fuel.... More boost...cams....

Lionel, thx for the numbers!

I did a log a couple days ago and logged 34.6 lb/min on my ported 14b at 20 psi.

If that airflow is accurate (no boost leaks) then that's awesome. Your timing curve looks....funky though. Anyway, good numbers. I wonder what kind of heat that 14b is putting out at that pressure though. I bet that's where you're getting some of your knock.