When does your T04B V-trim Spool

[TSIsean]

I'm really trying to figure out this spool problem, See this thread http://www.dsmtuners.com/forums/showthread.php?t=185732 for more info.

This is the kind of spooling I'm getting. I have a stock block and head with 264 Regrinds.
Compression is between 150 and 140 in every cylinder except the 2nd cylinder which is low at about 130.

3rd gear I'm getting 11psi. (4000rpms)
4th gear I'm getting 20psi (4000rpms)
5th gear I'm getting 20psi (3900rpms)

4th and 5th doesn't seem to be a problem but 3rd is really killing me. Full boost in third by about 5000rpms.

Any info you can provide would be great!

 

[Burnett03]

why are you posting two threads on the same thing?

what size exhaust? what intake? what o2 housing, ported, not ported? is the wastegate staying shut?

 

[RavenX]

I have a built 6 bolt ross pistons/scant rods .20 over 8.5:1 compression. Arp everything. Ported 1g head/intake manifold with stock valve train. Ported evo3 manifold and o2 housing. FP2 cams and a 25.5x10x3 spearco fmic more than enough to cool. I spool 20 psi in 3rd right around 4000-4100 and once it spools i get this very nice boost flutter/surge. No matter what throttle i am in it does that. The turbo is spooling fine but ive gone over everything in my setup and i just couldn't figure out why this was happening. Internal gate is holding fine but am switching to a 50trim now with a external 38mm tial. Ive pretty much had it with the internal gates. Dave has been very nice in response to my emails and i am sending the turbo and upgrading to a 50trim.

 

[1993eclipseGS]

I was getting 15psi around 4000rpms in 3rd I believe, That was trying to tune 680's with just a translator. First gear didn't even want to spool up I had to take the rpms up REALLY HIGH to even get a few lbs of boost. I had all the supporting mods except cams, I used 94 or 100octane all the time also, If that makes a difference.

 

[TSIsean]

why are you posting two threads on the same thing?

what size exhaust? what intake? what o2 housing, ported, not ported? is the wastegate staying shut?

Two differant topics. One realted to why the turbo isen't spooling. This is about other people's turbos in comparison to mine.

2.5 DP to 2.5 Test Pipe, Apexi N1 Catback. 2g manifold light port, 2g o2 houseing ported, yes the WG is shut.

 

[Burnett03]

Two differant topics. One realted to why the turbo isen't spooling. This is about other people's turbos in comparison to mine.

2.5 DP to 2.5 Test Pipe, Apexi N1 Catback. 2g manifold light port, 2g o2 houseing ported, yes the WG is shut.

your exhaust is killing your spool time. trust me i know, i just switched to a 3" from a 2 1/2

 

[Bastard1g]

I get the same kind of fluttering that everyone else is talking about. I didn't get the fluttering until I put an intake pipe on my car which let it breathe alot better. I thought it was my bov leaking, but I boost leak tested it at 30psi and no leaks. So i wanna know, is this fluttering bad? Its sounds kinda bad. Is it the turbo's fault?

 

[RavenX]

I get the same kind of fluttering that everyone else is talking about. I didn't get the fluttering until I put an intake pipe on my car which let it breathe alot better. I thought it was my bov leaking, but I boost leak tested it at 30psi and no leaks. So i wanna know, is this fluttering bad? Its sounds kinda bad. Is it the turbo's fault?

Well that fluttering is compressor surge. I flutter from the time i spool at 4k till 6k rpm. I myself felt uncomfortable hearing this everytime so am upgrading to a 50 trim for only $100 and i am going external. However i only flutter from 18psi and up. Ive been running the turbo like this since i installed the 6 bolt since my 7 bolt died on me. Either way am going to save myself the headaches and upgrade while i can.

 

[98GSX-WI]

I have the T04b V-trim and I have a flutter also. I thought that it was a boost leak somewhere around the throttle body area. (I definitely heard air leaking around the TB/intake, but never isolated it...I assumed it was the TB shaft seals or intake mani gasket). I only hear the fluttering when I am WOT and high rpms. I am seeing 20psi by 4000rpms.

I am having a 58mm throttle body and a water injection system installed later this week...now I'm kind-of worried. I thought that the fluttering was due to a boost leak. If it is due to compressor surge...is this something that I should seriously worry about. I did not buy the warranty...so I guess that I will have to wait to see if the turbo goes bad, if compressor surge is what I have. Is there any way to eliminate compressor surge without running lower boost?

 

[steel_3d]

I'm spooling about 10psi at 4200rpm in 3rd, and hitting 15+psi after that doesn't happen in an instant either. My g/rev airflow (mmcd logger) finally flattens out at 5200rpm.

My 14b would spool 10psi at 3k and 15psi at 3200, for comparison. I know that's already shitty.

I don't hear the turbo whistle at all with a straight 3" intake (blowthru maft), whereas the 14b whistled like a bus on the same setup.

But I still have the stock turbo back exhaust and unported 2g exhaust mani and o2 housing. I have a leaky mani to turbo gasket too, but the spool wasn't much better without the leak either.

I've taken the vacuum line off the wastegate actuator, which didn't change the spool at all. Haven't tried wiring the flapper shut.

I upgraded my stock ic to mkIV supra smic, that didn't change the spool at all. Weird enough it didn't help knock either. That might just be cause of high timing caused by the 680's.

I still have a lot of things to play with. Make sure I have no intake leaks, no exhaust leaks, good compression, full 3" exhaust, fully ported mani and o2. I also need a chip to get my timing back in check. I think a little more retarded timing would help the spool. I just hope I don't hit a dead end at that point like some of you.

My car doesn't feel much faster now than the 14b except towards redline. Not as rewarding as I'd hoped Haven't dynoed yet.

I have the clipped exhaust wheel btw.

 

[RavenX]

I have the T04b V-trim and I have a flutter also. I thought that it was a boost leak somewhere around the throttle body area. (I definitely heard air leaking around the TB/intake, but never isolated it...I assumed it was the TB shaft seals or intake mani gasket). I only hear the fluttering when I am WOT and high rpms. I am seeing 20psi by 4000rpms.

I am having a 58mm throttle body and a water injection system installed later this week...now I'm kind-of worried. I thought that the fluttering was due to a boost leak. If it is due to compressor surge...is this something that I should seriously worry about. I did not buy the warranty...so I guess that I will have to wait to see if the turbo goes bad, if compressor surge is what I have. Is there any way to eliminate compressor surge without running lower boost?

My take on the thing is thats a defect on the vtrim. You can continue doing it and although the turbo may not like it you never know is thats just a charasteristic of the turbo. The funny thing is some people don't get the problem and boost just fine. Just take a look at the turbo challenge winners for one

 

[99gst_racer]

but am switching to a 50trim now with a external 38mm tial.

Are you copying me? J/J You'll love the 50-trim. The boost doesnt come on as quickly, but it is much smoother and little to no surge!

Is there any way to eliminate compressor surge without running lower boost?

Nope. Unfortunately, the only way to stop surging is to quit crossing the surge line; which means you have to lower your pressure ratio (boost level) or increase your airflow. High boost coupled with low airflow will give you horrible surge everytime.

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I don't hear the turbo whistle at all with a straight 3" intake (blowthru maft), whereas the 14b whistled like a bus on the same setup.

hmmm.... Thats odd. My v-trim sounded like a Mack truck spooling up. Much, much louder than my old 14b.....

But I still have the stock turbo back exhaust and unported 2g exhaust mani and o2 housing. I have a leaky mani to turbo gasket too, but the spool wasn't much better without the leak either.

The three most common problems for slow spool are a conjested exhaust system (stock exhaust), a pre-turbo exhaust leak, and/or an extremely rich tune. It sounds like you have issues with all three. Get a 3" turbo-back, fix the leak, and lean it out some (safely). I guarantee you will spool quicker.

 

[RavenX]

Are you copying me? J/J You'll love the 50-trim. The boost doesnt come on as quickly, but it is much smoother and little to no surge!

naa i just got tired of the surge and when i talked to you about it you told me it went away by upgrading to a 50trim. As for the external gate well i got tired of playing around with the internal and i just didn't like it. Tommorow i'll post pictures