I have this turbo on my car and I would like to know when other people are making full boost on it. My turbo starts spooling around 3k, but I am not making full boost till around 4500. What are other people seeing? I don't really want people to guess either. I would like people who have datalogged it to answer. I have seen way to many people claim that they make full boost by 3500 rpm but after datalogging they see that they are only making 15psi at that rpm. Thanks

 

I am getting 18psi by 3800-3900rpm in 4th gear. I have not had my car tuned yet so 18psi is just the wastegate spring. I have no datalogging though, just a good eye.

Edit: I also run a HF cat too. So my spool up may not be as good as some. My turbo has a .63 turbine housing and .60 4" ported shroud.

 

I have a .63 backside with a to4s compressor housing. I don't trust the eye though. My eye said the same thing but the dattalog says something else.

 

Its funny that I see this come up. I get full boost which is about 19.5 psi or 20-21psi via map sensor in 3rd at about 4100rpm+/- in 3rd. I would say 4200 at the very latest, in 4th I can get full spool before 4k probably before 3900 or right at it I would think. I just tested 3rd this morning. I have been using this turbo now for about 2k miles though so far.

Exact same turbo TO4S .70ar frontside / .63 backside.

I will post data logs as soon as I get a chance just to be exactly sure. Because what you say above tends to be true somtimes.

 

Cool. Post those dattalogs when you get a chance or pm them to me.

 

Here are some datalogs for you. One in 3rd and one in 4th. Hope it helps give you a general idea. Looks like I was right on what I though.

 

As you can see in my signature, I've got one. I have not yet finished the "build up" so I don't really have any information to share. It does build boost rather quickly at 6000ft ASL. Alot quicker than I expected it too.

 

Thanks for the logs. That's about what I am getting with mine. I might be a little slower but I think my wastegate is opening a little early. What size spring do you have in your wastegate.

 

I am just running the 10/11 psi spring.

 

I had to get the stronger spring because the pressure was opening the wastegate early and it was making the turbo spool slow.

 

I have thought about it to see if it would improve things at all. Where did you get your spring from and how much? What color for what PSI?

 

I am running a big blue(1 bar) and a small red(.4 bar) together. So I don't really need a boost controller I can just run off the wastegate. I might pull out the small red though becuase I like to be able to adjust the wastegate opening with the profec and I want to be able to turn down the boost just in case I get a bad tank of gas. The springs have not totally settled in yet though, I am boosting about 22.7 on the two springs when I should be boosting right over 20. You can order them from atpturbo.com or roadraceengineering.com. They have a list of the springs with pressures on rre's website.

 

Thanks

 

Have you guys noticed that the turbo seems to spool a little faster as it gets broken in? It seems like mine is starting to spool a little better.

BTw, I use the the big blue spring and small yellow spring. It gives me 18psi w/ out boost control. Also, the guys at ATP told me that 2 springs gives better spool up and less boost spikes.

 

Nope. Your just used to it. Turbo's dont break in. Sit in a stock turbo evo and you'll be like WOW...FAST SPOOL