T04b 50-trim VS. T04e 50-trim

[99gst_racer]

How does a T04b 50-trim compare to a T04e 50-trim? I'm looking for a direct comparision between the two. Obviously the compressor housing is different, but I was inquiring about spool, max output lbs/min, low-end and top-end power differences. Do they share the same compressor map? Any info would be greatly appreciated. Feel free to discuss.

 

[gasguzzler]

Most likely you will notice no difference in spool time, low-end performance, and on the top end you may see a slight gain (although nothing major). The compressor map is based off of the capabilities of the compressor wheel, I don't believe the compressor cover is factored in.

- Brian

 

[guitarXgeek]

You'll more than likely sacrifice a little compressor efficiency with the smaller t04b compressor cover. Flow numbers and spool will be very similar if not identical between the two.

I have the t04b "50 trim" on my car and I get the same spool-up time as my bud's Tsi that has a to4e "50 trim" with almost the same mods as me. I can't say much for power differences because we've never raced, but having taken a few rides in his car it pulls almost the same as mine at roughly the same boost level.

 

[99gst_racer]

You'll more than likely sacrifice a little compressor efficiency with the smaller t04b compressor cover. Flow numbers and spool will be very similar if not identical between the two.

I have the t04b "50 trim" on my car and I get the same spool-up time as my bud's Tsi that has a to4e "50 trim" with almost the same mods as me. I can't say much for power differences because we've never raced, but having taken a few rides in his car it pulls almost the same as mine at roughly the same boost level.

So, are you happy with it's performance? Would you recommend it?

 

[CanadianTSi]

You'll more than likely sacrifice a little compressor efficiency with the smaller t04b compressor cover. Flow numbers and spool will be very similar if not identical between the two.

I have the t04b "50 trim" on my car and I get the same spool-up time as my bud's Tsi that has a to4e "50 trim" with almost the same mods as me. I can't say much for power differences because we've never raced, but having taken a few rides in his car it pulls almost the same as mine at roughly the same boost level.

When do you hit full boost??

my to4e 50 trim hits 22psi right around 3800 FYI.

 

[guitarXgeek]

So, are you happy with it's performance? Would you recommend it?

Eh, If I had to do it again I would have purchased the t04e cover. Don't get me wrong, I'm happy with the t04b "50 trim", but I only decided to get it because I was mislead into thinking a t04e cover was a pain in the ass to fit inside our engine bays. However, after helping my bud install his t04e "50 trim", I realized that all of those fitment issues (water pipe, fans, FMIC piping, etc) claimed by some t04e owners are not a big deal AT ALL and are extremely easy to fix.

I just feel like that slight loss in compressor efficiency may inhibit this turbo's pump gas power, depending on intercooler efficiency. Plus, it's just one of those mental things, knowing you've got a turbo that has accomplished impressive numbers. I've yet to see any real numbers from other people running a t04b "50 trim". I don't have any real performance numbers (track times, dyno #'s), but hopefully I'll be able to get some track numbers very soon. I'll be sure to check back and let you guys know how it does at the drag strip!

 

[guitarXgeek]

When do you hit full boost??

my to4e 50 trim hits 22psi right around 3800 FYI.

Well, I'm having some problems with the internal wastegate blowing open extremely soon. However, when the wastegate is wired shut I get ~20psi by ~3900rpm. I may be able to get that number down a bit because the car is on a very rough tune right now.

 

[Burnett03]

When do you hit full boost??

my to4e 50 trim hits 22psi right around 3800 FYI.

wow well thats not fair! maybe my 2.5 turbo back exhaust is making my 60-1 spool so slow!

 

[psychlow]

I've yet to see any real numbers from other people running a t04b "50 trim".

http://www.turbochallenge.com/
394WHP - 24PSI on a low pressure actuator
402WHP - 25PSI on stock cams, 22 counts of knock, 100 octane unleaded
11.88 @ 117.30 - 24PSI

Definitely not bad for the price....

 

[blackifre22]

wow well thats not fair! maybe my 2.5 turbo back exhaust is making my 60-1 spool so slow!

no i think its your 60-1 making your 60-1 slow spooling

but 2.5 inch exhaust has some to do with it

 

[guitarXgeek]

http://www.turbochallenge.com/
394WHP - 24PSI on a low pressure actuator
402WHP - 25PSI on stock cams, 22 counts of knock, 100 octane unleaded
11.88 @ 117.30 - 24PSI

Definitely not bad for the price....

Those are V-trim and H3 dyno numbers. I'm talking about the t04b-50 which is the same as the t04e 50 trim but with the smaller t04b compressor housing. I've yet to see any numbers with this particular turbo.

 

[psychlow]

Ahh, my fault.

People around here have a tendency to call the V-trim a 50-trim (which, of course, is untrue.)

 

[99gst_racer]

Well guys, I ended up going with a T04b 50-trim. I wanted the "e" housing, but I got a really good deal on the "b" housing. This turbo feels much much more streetable than my v-trim did. So far so good.

 

[CanadianTSi]

Well guys, I ended up going with a T04b 50-trim. I wanted the "e" housing, but I got a really good deal on the "b" housing. This turbo feels much much more streetable than my v-trim did. So far so good.

Good choice, the E housing is a PITA to make fit, even with the thicker flanger on the SBR manifold...

 

[steel_3d]

99gst, can you elaborate on how/why the 50trim is more "streetable" than the v-trim? Does it actually spool better than the v-trim?

I'm unhappy with my vtrim's spool, takes till about 4200 to hit 10psi, but I'm on the stock exhaust and haven't ruled everything out yet, so I'm not gonna whine yet

 

[RavenX]

Well guys, I ended up going with a T04b 50-trim. I wanted the "e" housing, but I got a really good deal on the "b" housing. This turbo feels much much more streetable than my v-trim did. So far so good.

Pleaso elaborate because am unhappy as well with my vtrim and may end up getting something else if i cannot figure out my problem

 

[99gst_racer]

Well, I was mostly always happy with my v-trim. A few thing that I noticed that I did not like were compressor surge and the way the boost came on. For exampe: If I were on the highway with my cruise set at 75 mph, I would be at about 3-5 vac on the boost gauge. As soon as I hit a slight incline, the throttle % would increase to maintain the correct speed and the boost would raise to about 6-8 psi. Within a couple seconds of the boost raising, I would get severe compressor surge. It got to the point where I could never use my cruise control and if I ever had to speed up, I would have to downshift and I would have to apply no less than 50% throttle for it to not surge. Also, it seemed to make the same amount of boost at 25% throttle as it would at 100% throttle. I didnt really like that too much because that would potentially lead to surging also. I was happy with the power the v-trim made, but it was kind of a PITA for daily driving.

Now this 50-trim however - totally different story. I have yet to experience any compressor suge whatsoever. I am currently running this only at 14 psi like I was on the v-trim, and I am flowing about 1-2 lbs/min more than before. Here's the thing I like more about this. If I'm half throttle, then I'm at roughly half the set PSI. It feels powerful and fast and yet still retains the driveability of a T25 (if I dare say that). I'm in love with this turbo, and I cant wait to see what it does at 20+ psi next week.

 

[guitarXgeek]

I'm in love with this turbo, and I cant wait to see what it does at 20+ psi next week.

Speaking from personal experience, 20-22psi on this turbo is enough for major neck straining

 

[steel_3d]

Wow, compressor surge on a v-trim. I thought you needed a much bigger compressor to get that. I can't get mine to spool, not to mention surge

Would it surge at wot, or only at part throttle?

What was your spool like?

I have the clipped exhaust wheel, I think some of you lucky bastards spooling at 3700 must have the unclipped ones.

 

[99gst_racer]

Wow, compressor surge on a v-trim. I thought you needed a much bigger compressor to get that. I can't get mine to spool, not to mention surge

Would it surge at wot, or only at part throttle?

What was your spool like?

I have the clipped exhaust wheel, I think some of you lucky bastards spooling at 3700 must have the unclipped ones.

Yeah, it was extreme surge. Very violent. I didnt surge at WOT, only at part throttle. That was the problem. Most street driving (about 99%) is dont at part throttle, so it was always a constant battle. I was seeing full spool at like 3800-3900, but I'm running phat though, so I feel that I could have improved that number.

 

[steel_3d]

But you had about 8psi around 3k? (75mph at least in my car). My needle barely goes above 0 at 3k and finally hits 8psi around 4.

 

[RavenX]

My problem is basically i am getting boost flutter/surge after 18psi and its really getting on my nerves since it happens no matter when i am on the throttle 50%, 80% etc. Am pretty much pinning the problem on the wastegate flapper itself and i may just have to spend the money on the external setup. I was looking at the turbular manifold that SBR has to offer. I noticed they had a offer going on for $642 for the turbular manifold and a tial 38mm external wastegate. Opinions on this? or should i just go ahead and send my evo manifold to SBR and have them flange it for a tial 38mm external?

 

[99gst_racer]

My problem is basically i am getting boost flutter/surge after 18psi and its really getting on my nerves since it happens no matter when i am on the throttle 50%, 80% etc. Am pretty much pinning the problem on the wastegate flapper itself and i may just have to spend the money on the external setup.

I've been running an external WG since before I even bought the V-trim, and I still experienced surge......

I was looking at the turbular manifold that SBR has to offer. I noticed they had a offer going on for $642 for the turbular manifold and a tial 38mm external wastegate. Opinions on this? or should i just go ahead and send my evo manifold to SBR and have them flange it for a tial 38mm external?

If I were you, I would just have them weld it on your EVO manifold. You allready have a nice flowing manifold and it will only probably cost you $300-$350 for everything. That sure beats spending $650....

 

[RavenX]

Yeah ive decided on sending the evo manifold to get the external. Well ive been reading around about the boost problems and surge problems that the vtrim has. I may just have to talk to dave and order the 50trim then. Hopefully he can get me a deal on just the compessor wheels but i may just go ahead and order the whole thing new.