I have a 4 pound spring I believe and it usually stays around 4-5 psi but now all of sudden it’s just goes up to 9-10 psi and I boost cut since my tuner knows I’m not going up to 10psi at the moment any help ? Was reading not sure if a boost controller would work

 

Give details of setup in full . Tell us about your boost reference points you use, what boost controller you have, and detailed photos of how it is set up....

Until those are done... no comments

 

hey my account stopped working had to use a different one but my setup 07 Civic si Emusa Turbo Kit I am etune already 410cc injectors 38mm wastegate the wastegate is being sourced from the intake manifold stock fuel pump stock map no boost controller At night time when the air is about 75 degrees intake temp will sit at 90-100 and there will be no spike at all only when hot outside IAT will sit about 105-115 and then will spike up not really sure what to do maybe a different hose to use for the intake manifold to the wastegate ? Don’t have any photos at the moment

 

So not a boost spike, a rise in IAT? Are you driving when the IAT goes up during the "hot outside" temperature is occurring, or are you just idling the car?

 

no it’s defiantly a boost spike I will push around 9psi of boost when it is hot outside and normal psi when it is night time but I’m saying I noticed boost will spike up when the IAT is higher

 

That doesn't make sense, really. The reason why most increases in boost (such as creep or even spikes) occur with with cooler, denser air, going into the compressor inlet and and the intercooler,resulting in lower IATs, not higher. I suspect something may be wrong with boost settings. What's the boost controller setup? Manual? ECU based? Independent EBC?

 

the thing is what I’m confused about is that it will do it sometimes it’ll just spike up to 9-10psi and I’ll hit boost cut I don’t have a boost controller going straight off wastegate spring which is 4psi I’m using Hondata flash pro tuned by Derek Robinson

 

Email Derek. Im sure he will be able to assist you.

 

07 Civic Si is K-series, yeah? So.. You're running a K20 (I believe) on a 4lb wastegate spring?
Who is tuning this again? What shop? The name is not familiar.. I'm pretty sure you're only spiking that little is because your boost cut is set so low.. I'm willing to bet this would overspool the **** out of that EMUSA turbo. Lol!

 

Yeah k20z3 and it was a constant 4-5psi driving perfectly which is where I want it because my injectors are 410cc which Not enough fuel for 7psi+
and he set boost cut for 10Psi and it’s not a shop it’s a etune one of the best etuners out there for k series

 

I'm sorry, but this is a case where e-tuning isn't enough here. You may have your vacuum sources in the wrong places, (and no, the compressor cover is ok to use, but isn't the BEST source of vacuum).
You need larger injectors.... period. If not, you will destroy this engine, regardless of the boost pressure relative to the EMUSA turbo size.
Is it a EMUSA wastegate? could have problems with the valve, diaphram, or other issue causing the spike. (Not to mention, it's tough to get just 4psi out of something as efficient as a K20Z3 engine anyway, those have a lot of exhaust energy for their size.

Your exhaust manifold configuration may be made for larger turbochargers that don't vent that little amount of pressure due to the size runners. (Sidewinders vs. log-style manifolds, use different sized runners which easily effect exhaust energy.

This isn't just a one-issue pony, here. If you don't know how these components operate and depending upon the "best e-tuner" in the business without him going over everything on the fly in person, well, we can't help but only so much, you'll need to go to him to see what's going on. Or better yet.. Take the time and drive or trailer there. .

I'm sorry, I couldn't be more helpful, but there are literally about 20 different variables I can come up with to be possibilities..

 

I would hope that the best e-tuner available for K-series would catch you hitting boost cut, with no boost controller on a 4lb spring, and inform his customer RIGHT AWAY of an issue.. Shodan nailed many points above at play here and these are things any reputable tuner would have caught onto immediately. Your tuner lied to you; caught numerous problems and stopped the process; or isn't actually qualified at all to tune anything.. I'm leaning toward the latter..

 

Drob
he’ll tune circles around you

 

I'm sure he may but, it sounds like he's also trying to tune this poor fella's car to pieces..

 

problem was fixed just a the hose connected to the vacuum line was a bit to long and wasn’t the best type Cheap hose from Home Depot Changed it up and everything good again car running great don’t blame my tuner he just takes about a day to reply and I was impatient and wanted to ask the forums car is pushing some great power on 4-5psi I’m looki to get bigger Injectors but not right now I want a good daily with some power

 

he noticed the boost cut immediately and we went sending pics of where the source is and etc he suggested running a different hose and fixed the problem

 

This your first E-tune? Takes time, and if you're not patient, you can end up smearing somebody pretty hard. As I mentioned a competent tuner could easily identify the issue and stop the process or correct the issue and move forward! You made it seem as if they just tuned your car and let you go. Lol. Anyhow, good that it was actually identified and corrected.. Now go get some larger injectors!!

 

Glad it was simple, and rather predictable. And solved. But before you get offended any further, just slow down a bit, and just appreciate the fact that it was your own diagnosis. Very few trust e-tuners: period. D-Rob (from IMW) is a bit of an exception, but even he would admit that the way you presented the issues you had, with such little background, meant that it could be any number of issues that were available. I'm just glad it was a small physical connection with a cheap hose. I could easily see a whole lot of other issues going along with this. Not to mention, I don't think your problems are going to stop after this. I just have a feeling that This is the end of the beginning. And no, not because of the turbo you used.

But congrats, regardless.