JusMX141
Moderator
- 15,148
- 1,269
- Dec 13, 2005
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Greensburg,
Pennsylvania
That's the wastegate actuator.
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Thanks for the reply and sorry for the late response. I found out that the turbo I have is actually a U-Trim. I can't find much information on it except for a few posts over on a RX7 forum and a post on a Mustang SHO forum. The U-Trim is a 60 trim T04B while a V-Trim is a 63 trim. Unfortunately, I couldn't find any compressor maps or flow data. The strange thing about the turbo is that is has a bolt-on exhaust housing similar to ones Bullseye Power sold in the past. I'm wondering if this is one of the bolt-on offerings that Bullseye sold in the past for our cars. I guess I'll take my chances and try it out.Garrett T04B-something....pretty sure the old V-Trim was the compressor with an inducer of 54.2. Probably has a giant P-trim turbine and has no business being on a performance 4-cylinder....do some research regarding how the T04B V-trims worked on DSM's before deciding to run one.
Eh, there are definitely better units out there with newer tech. If it doesn't spool to late and seems to work well otherwise, then I'd just keep it there.Ok thanks. Is it an ok turbo?
Not sure what data you're researching, but a compressor with a 54.2mm inducer and 70mm exducer absolutely has a trim number of 60 as you've stated earlier....and a 54.2/70mm compressor is absolutely a T04B V-Trim wheel.Thanks for the reply and sorry for the late response. I found out that the turbo I have is actually a U-Trim. I can't find much information on it except for a few posts over on a RX7 forum and a post on a Mustang SHO forum. The U-Trim is a 60 trim T04B while a V-Trim is a 63 trim. Unfortunately, I couldn't find any compressor maps or flow data. The strange thing about the turbo is that is has a bolt-on exhaust housing similar to ones Bullseye Power sold in the past. I'm wondering if this is one of the bolt-on offerings that Bullseye sold in the past for our cars. I guess I'll take my chances and try it out.
I think Justin was referring to an earlier post(DSMlover's), not yours. @RocuskieOk thanks. Is it an ok turbo? Car pulls hard and all. But I'm only running rc650 injectors with an aem ems series one right now. The tune I'm running has them at a 60% duty cycle at about 14 psi with 11.2 afr at wot. Looks like I still have a lot of work to do. Car was a mess when I first got it. Hopefully I'm on the right track. My numbers seem off tho.
I'm not trying to start anything since you have a great reputation when it comes to turbocharger knowledge and I really do appreciate the help. However, I believe you are incorrect about my turbo. It is indeed a U-trim compressor wheel. Here is the info I found on an RX7 forum pertaining to T04B compressor wheels:Eh, there are definitely better units out there with newer tech. If it doesn't spool to late and seems to work well otherwise, then I'd just keep it there.
Not sure what data you're researching, but a compressor with a 54.2mm inducer and 70mm exducer absolutely has a trim number of 60 as you've stated earlier....and a 54.2/70mm compressor is absolutely a T04B V-Trim wheel.
It would be a Bullseye Power T04B V-Trim...plenty were sold, none worked out very well. Long story short- the turbine flow is too great for the compressor- so it's laggy, very prone to surge if the boost level is high enough, and doesn't flow anywhere near what the compressor is rated for as a result. An Evo III 16G will outspool and outflow a V-Trim on a DSM.
99gst_racer said:I had one for a few months.
It surged so bad that it eventually wore out the journal bearings and developed nasty shaft play.
I wouldn't recommend that compressor wheel for a DSM.
KYNgsx said:Yup, another ex-user here. My experience was pretty similar; lots of surge, and then it blew. Good learning experience I guess; made a much better choice on my next turbo.
RavenX said:I used the Vtrim. I had to get rid of it because it would surge on my built 6 bolt at only 18psi while other people running stock motors were pulling almost 400whp which was really odd to me. In the end i went for the t04b 50trim and haven't looked back ever since. According to dave the vtrim is not a very forgiving turbo because of the map. Its up to you which one you want but i would just get the 50trim since its tried and true.
Slowboy said:Bullseye T04B V-Trim:
15 PSI: 249 ft/ lbs 302 WHP
20 PSI: 321 ft/ lbs 329 WHP
http://www.slowboyracing.com/downloads/dyno graphs/TO4B V-trim Test #2.JPG
http://www.slowboyracing.com/downloads/dyno graphs/TO4B V-trim Boost Graph Test #2.JPG
We did use the low pressure WG actuator that was sent with this turbo. It did show signs of not being able to hold 20 PSI to redline, so boost was actually about 18-19 PSI. We did also run into a little bit of compressor surge when we did try to tighten the WG actuator down to hold more boost. Of course, at 10:1 compression, and only running about 16 degrees of timing, this may have been a culprit as well. However, in trying to keep the testing on a level playing field, we worked within the given parameters.
Mike Huml
Slowboy said:Well, it seems every internal WG actuator we test on a DSM all have the same problems. We try to tighten the actuator arm up (to make turbo spool faster by holding flapper shut longer) and the boost spikes. We loosen it up and spool up goes down the drain.
Slowboy said:We had only limited time today to get the test done- we had a few dyno appointments. We did manage to spend some time with the MHI Evo III turbo however, notice on the 15 PSI graph the boost crept from 15 to 20 psi.... the opposite problem we have been having! This was an unported turbo with no 34 mm flapper to help control boost creep. It was only an issue when we tried to run less than 20 psi however.
15 PSI: 290 ft/lbs 344 WHP (crept to 20 PSI)
20 PSI: 344 ft/lbs 344 WHP
25 PSI: 400 ft/lbs 375 WHP
30 PSI: 436 ft/lbs 397 WHP (fell to 23 PSI at redline)
We can easily make 400 WHP if we wanted to run more timing, or if we were on our old 2.3l motor we liked to beat on back in the day! We will have this turbo back on once we go external as well.
http://www.slowboyracing.com/downloads/dyno graphs/E16G 15-20-25-30psi.JPG
http://www.slowboyracing.com/downloads/dyno graphs/E16G Boost Graph.JPG
Mike Huml