Help Me Brainstorm......

[A4 TSCHUSS]

I have the GT3071r in the car (been in 2 days now), but I am having lag problem and am a little confused. It is a T3 flange .63 a/r exhaust and I have a Tial 38mm wastegate. I currently have a intake on it consisting of the 4 to 3" 90 off the turbo to a spacer to a coupler to the stock maf then a filter. This is exactly what Shawn ran while still on the GTRS file and 430cc injectors (I have 440cc though) and had 20psi or more at roughly 4000rpm while also running only timing 6 or 7 forget which one.

I am running on Timing 9 with meth injection and have the boost controller set at 20psi. I dont get full boost until 5000rpm and it is pissing me off! I have the wastegate open dump right now (getting it routed into exhaust on Monday) so I would think I would hear it if it were leaking which could cause the slow spool up. And I had the turbo hold 25psi to 7000rpm so I don't see a boost leak being a problem, but who knows. I am gonna try to run it with open turbo tomorrow morning for the hell of it even though with the same intake I have it worked fine for Shawn.

Just figured I would throw it out there and see what you guys though. And aside from the late spool when it does get going at 20psi I think it feels the same as my GTRS did except with it I was taking off sooner gotta get this figured out! A friend rode with me and he said it felt faster to him but I then was messing with boost and timing (did the 25psi run on Timing 3 just to see if I could hold high boost) and was saying how I turned it down checking stuff out, but then turned it back to full timing on 9 and 20psi like I had it before and then he said yeah it does feel like you turned it down but he said that right after I did a run with it the same way he said 5 minutes earlier that it felt faster so his opinion was totally void.

[Condo]

I had a bad DV that was causing my GTRS to hit full boost around 5k. Might want to eliminate that cause first.

[A4 TSCHUSS]

I have a brand new forge 004 less than 1 month old and the gtrs was spooling up perfect with it the day before I put this kit in. I guess I could try putting my 007 diverter valve in and use it like a bov just to test for the hell of it.

[Condo]

It's worth a try. I had an o-ring that failed in mine.

[A4 TSCHUSS]

yeah anything is worth trying, if I wanted 5000rpm spool up then I would have a bigger turbo!

[Condo]

What manifold are you running? Might as well be running a GT35 if you're not hitting full boost until 5k.

[A4 TSCHUSS]

atp t3 log manifold.

[A4ringedONE8T]

Good call on the BOV/DV

David, have you done a boost leak test?

[A4 TSCHUSS]

not since this problem no. I havent really done anything, I am gonna get under the car and look around tomorrow morning and then I guess I will swap out the bov for my dv and try that then if that didnt do anything I will try taking off the intake for the hell of it and before all that I will check for a rip or something in a connection but like I said I help 25psi to 7000rpm so didnt even think twice about it being a boost leak as far as intercooler piping and couplers wise but I guess anything is possible.

[A4ringedONE8T]

Not that this would really make any difference, but do a TB alignment while you're at it as well

[Condo]

atp t3 log manifold.

The guy who built my manifold says log manifolds are a major restriction but I think Shawn is doing just fine with his.

[A4 TSCHUSS]

yeah like I said my stuff is nearly identical to what he ran. Same turbo, same manifold, same intake, I have 3" exhaust back to the y.

[A4ringedONE8T]

The guy who built my manifold says log manifolds are a major restriction but I think Shawn is doing just fine with his.

Not everything made in the stone age is ideal lol, doesnt mean it wont work The ATP design for sure is not optimal, but it works much better than I ever thought it would.

[B6Lovin]

exhaust leak giving you slow spool? It's the only that really comes to mind if you're holding boost, and getting mostly normal driving (aside from the terrible spool time) that is possible based on what's involved in swapping turbos. (meaning things you took off/put on)

i'm assuming you used all new gaskets, so i'll also go ahead and jump to the conclusion that maybe something is loose/was from the start.

also, even though you have open WG dump and should hear it if it opens early, I'd check those lines thoroughly just to completely eliminate that as a potential cause.

[A4 TSCHUSS]

wastegate lines wont matter, if I had a leak there then it just wouldnt open the wastegate at all or to late. And I checked out all the bolts a few times after runnning it different times to be sure I had no leakes, etc. Going to try the diverter valve now and check one silicone fitting then run no intake

[A4 TSCHUSS]

swapped the bov for my diverter valve and that didnt do anything. I then took off the fitler and maf from the intake leaving the 90 off the turbo and it seemed to help a little at first but then I had the same problem. It would spool up 20psi right at like 4500 which is still to late but then later went back to spooling at 5000 if I were to roll in 1st then pound it, cruise 40mph in 2nd then pound it or run 60 then pound it in 3rd. They all resulted in 5000rpm being the take off point. The car ran ok for a few minutes with the MAF unlplugged then it started running terrible. I don't understand why mine cant run without it. It started misfiring really really bad at idle or low rpm and I would have intermittent flashing cel and I had like only 5 to 0 for vacuum. Before I had 15 which is what I have had forever. Letting car cool down now so I can put the intake and maf back on.

I also looked around at the vacuum hoses and the fitting that I undid on the intercooler piping to make sure there wasnt a problem there and didnt see anything. Sure hope I dont regret doing this.

[dirtybrd]

Are you sure you got a .63? It sounds more like a .82.

[A4 TSCHUSS]

yes, the guy I bought it from said he hit 22psi at 4000rpm

[dirtybrd]

Didn't say a while back you where used oil/low compression?

[A4 TSCHUSS]

I have 160, 165, 160, and think last one was 170. Nothing terrible it just wasnt 195. Yes I burn some oil. I had no problem at all the day before spooling my gtrs up.

[mike-2ptzero]

wastegate lines wont matter, if I had a leak there then it just wouldnt open the wastegate at all or to late. And I checked out all the bolts a few times after runnning it different times to be sure I had no leakes, etc. Going to try the diverter valve now and check one silicone fitting then run no intake

Have any pics of it installed in your car and are you running a N75, MBC or EBC?

[A4 TSCHUSS]

no pictures yet and I am running a hallman mbc. It is actually Charlie Ashby's old one from a long time back. He gave it to me when I came to Cali since he had the Apexi ebc.

[A4 TSCHUSS]

I was talking to a guy and he was saying he actually got like 300rpm sooner spool from going to a profec b ebc from a mbc. He had a $10 crappy one though if that matters. I didnt think an ebc spooled and faster than a mbc, just controlled spike. But still that would only put me at like 4600 for 20psi

[dirtybrd]

So the only things you changed were the mani., turbo, DP, and intake? What PSI WG spring?

[A4 TSCHUSS]

I swapped the manifold and the turbo, installed the 3" downpipe and then had 3" exhaust ran from the downpipe to where the exhaust splits in the back. I put on a 4" to 3" 90 off the turbo with an apapter then coupler attached to the stock maf then a big cone filter.

I asked the guy I bought the turbo from what spring was in the wastegate and he didnt know, he said it was stock, whatever comes in the B5 Gt3071r kit. He said he ran 22psi though and hit it right at 4000rpm.

[RLB6]

I was talking to a guy and he was saying he actually got like 300rpm sooner spool from going to a profec b ebc from a mbc. He had a $10 crappy one though if that matters. I didnt think an ebc spooled and faster than a mbc, just controlled spike.

MBC's allow boost pressure to hit the wastegate actuator and starts to creep open before your desired boost is reached. This means boost will come on slower. With a EBC, you can program it to keep the wastegate fully closed until the last possible moment, allow you to build boost faster. I have a profec b spec II and I have mine set to start opening the wastegate at 19 PSI. Any later than that, it will boost over my set boost pressure of 22 PSI.

EBC's are a good investment, especially for big turbo's on smaller motors.

[dirtybrd]

Did you inspect the exh. wheel before installation? On my old GT30, the exh. wheel was damaged and was causing late boost on a .48 housing.

[mike-2ptzero]

MBC's allow boost pressure to hit the wastegate actuator and starts to creep open before your desired boost is reached. This means boost will come on slower. With a EBC, you can program it to keep the wastegate fully closed until the last possible moment, allow you to build boost faster. I have a profec b spec II and I have mine set to start opening the wastegate at 19 PSI. Any later than that, it will boost over my set boost pressure of 22 PSI.

EBC's are a good investment, especially for big turbo's on smaller motors.

Correct. This is because you end up using a pressure line to the top of the WG to keep it closed up to the point the EBC forces it open from the inlet on the side of the wg which is below the diaphram. Using a EBC also removes any chance of the wg being forced open by the exhaust pressure.

[A4 TSCHUSS]

yeah I looked at the compressor and exhaust wheels and shook the shaft, it all looked good

[A4 TSCHUSS]

Correct. This is because you end up using a pressure line to the top of the WG to keep it closed up to the point the EBC forces it open from the inlet on the side of the wg which is below the diaphram. Using a EBC also removes any chance of the wg being forced open by the exhaust pressure.

the wording on that confused me a little, but I have the hose connected to a nipple on the side of the wastegate that the mbc is connected to and there is nothing on the top of the wastegate where there is a threaded hole.

[dirtybrd]

I only run a side line on my WG also. Should we be running a side and top? How does that work? Should the WG signal line be split, one to the side and one to the top?

[mike-2ptzero]

the wording on that confused me a little, but I have the hose connected to a nipple on the side of the wastegate that the mbc is connected to and there is nothing on the top of the wastegate where there is a threaded hole.

Yeah you dont need to put anything to the top of the wg when using a N75 or MBC, but when you use a EBC the hose coming from the compressor housing or IC pipe will end up going to a Y with one side going to the side of the wg and the other one to the EBC inlet. The outlet from the EBC then goes to the top of the WG.

I asked the guy I bought the turbo from what spring was in the wastegate and he didnt know, he said it was stock, whatever comes in the B5 Gt3071r kit. He said he ran 22psi though and hit it right at 4000rpm.

What GT3071r kit would that be? Because ATP doesn't list a 3071r kit for the B5 on their site and the page with the Tial shows a choice of spring rates.

[A4 TSCHUSS]

I dont know, he just said he bought a kit for his B5 and didnt know the spring that was in the wastegate. But like I said, the guy was running 22psi at 4000rpm so why the hell would I hit only 20 at 5000!

[dirtybrd]

Can you find a drawing? This might be why my Profec might not be working. It won't control boost at all. I can use the low boost setting and no gain and if I try to use it I just get full turbo boost, no control. I've been running off the WG spring, 5-6psi.

[mike-2ptzero]

Can you find a drawing? This might be why my Profec might not be working. It won't control boost at all. I can use the low boost setting and no gain and if I try to use it I just get full turbo boost, no control. I've been running off the WG spring, 5-6psi.

greddy install instructions


If you have a external wg go to page 11. The 2 loose ends on that picture go to a Y and then to the pressure port (turbo housing or charge pipe).

[dirtybrd]

So boost signal straight from the turbo split to the lower WG fitting and WG solenoid and signal from the solenoid to the top of the WG? Would having only the lower line hooked up be the reason I have no control over boost? David, sorry to threadjack.

[mike-2ptzero]

So boost signal straight from the turbo split to the lower WG fitting and WG solenoid and signal from the solenoid to the top of the WG? Would having only the lower line hooked up be the reason I have no control over boost? David, sorry to threadjack.

Yes that would be a problem because the EBC uses both sides of the diaphram in the WG to control boost.

[A4 TSCHUSS]

tried running car with no wastegate signal hose attached and still same thing, boost was no earlier. Going to eat some lunch now and then come back and do a pressure test.

[dirtybrd]

Yes that would be a problem because the EBC uses both sides of the diaphram in the WG to control boost.

I'll try it.

[A4 TSCHUSS]

just did a pressure test and I couldnt hear or feel any leaks besides the fuel injectors leaking like no other. But they have always leaked quite a bit since the day I put them in 2.5 years ago and did a pressure test. And they werent touched in no way when the new turbo went in so nothing has changed with them at all anyway.