Sr20det boost cut/ studder/ choke. No boost?!

[SilviaT]

Rebuilt redtop sr20det cp pistons arp head studs, oem for the rest of the rebuild.
Enthulapy tune for 440cc injectors and n60 mafs
Fuel rail with ACCEL DFI fpr (I think that's what it is)
T28 on 12lbs external waste gate
Greddy rs bov
Turbo xs dual stage mbc
Boost gauge
Ngk iradium bkr7eix gapped at .25. Usually fouled when pulled..
Chevron 92 octane.
So whenever I get close to boost/ Wot, my car chokes out and won't pull..
It has a studdering feeling where it will cut power out completely at around 4k when I'm around building boost..
Recently: replaced my mafs (which WAS bad)
Cleaned air filter with k&n kit
Cleaned my plugs and they kinda smelt like gas.
Replaced knock sensor a while ago when code 34 was shown.
(^ after I replaced knock sensor I was gettin boost fine, now I'm only showing code 55 consult terminal. Usually that's fine.)
Feels exactly how it felt before i replaced my knock sensor.
i know for a fact I'm running rich.
For a while my mafs kept messing up and Id have to fix the connection and clear the codes.. Could this retard my timing? I have not checked yet....
Please help me get boosters again so i can slide!

[SilviaT]

All I can think of next is;
Fuel filter/ pump
Check timing.
CAS
IACV
TPS
and I'm pretty sure my turbo is fine. I will try to check the turbine after work today. Sometimes I can get 5psi in 5th gear half throttle. Almost wot. Bov sounds fine.
Hopefully my wastegate arm is still good. Will check.
Anything I'm missing??????

[SilviaT]

Bumpppp. Maybe I need a boost leak tester is what I've heard

[KendallH]

Check your fuel pump/tank.

edit: assuming you don't have a wideband?

[SilviaT]

No wide band... I am unassuming my timing is off due to running in limp mode for a couple days and I haven't had the time to check yet...

[SilviaT]

Boost leak test first. I have a feeling I'm overlooking a leak

[SilviaT]

Compression is fine. NO vacuum leaks. Coils are acting fine.
I believe it is my Enjuku racing Enthulapy ECU is telling my injectors to spray for too long..
SO i am going to buy a SAFC version 1 if i cant fine a neo for cheap..
This way i will have a good view of my a/f ratio. I do not have a wideband since i have no O2 on my downpipe..

[KendallH]

1. An safc does not show a/f ratio
2. An safc is not the solution to your problem. If you truly think its an issue with the tune you need to send it in to enthalpy for inspection.

You need to get a wideband to see your a/f ratio. You should be looking at your injector o-rings and whatever fpr that is before assuming its the tune.

[SilviaT]

Well when i took it to my shop, they put it on the dyno and adjusted my FPR towards leaning out so i will not flood my plugs as much. Yeah getting a wideband would be a good idea..

[Sx-mad]

Should do a log of you maf voltage when accelerating.

[240dream]

sounds like its just running super rich, my ka-t did this as soon as it hit boost it would just die and cut it self off

[KendallH]

Well when i took it to my shop, they put it on the dyno and adjusted my FPR towards leaning out so i will not flood my plugs as much. Yeah getting a wideband would be a good idea..

Ok well this is just not right at all. Your fuel pressure needs to be adjusted to 43.5psi. You cannot properly tune an SR or any EFI ecu based on fuel pressure. If they are "tuning" your motor based on looking at the plugs, that is a technique that was used by carb V8 guys back before modern engine tuning and will not yield results. If you can, put the stock fuel pressure regulator back on, because I'm not sure if that Accel FPR is even meant for a turbo application. That could be your entire issue right there. And please do not ever take your car to that shop again because they have no idea what they are doing.

[SilviaT]

I feel like an idiot..
I looked at my FPR and the vacuum hose was not connected to the T fitting..
Connected it to its correct place, drove down the street and my boost is building nicely and blowing off smoothly. A little studder under WOT un 2nd gear but it goes all the way to 10lbs without breaking up in 3rd and 4th gear. havent done 5th.
Still am planning to use a SAFC II.
My injectors are working fine. Idle is fine and smooth now. 850rpms warm.
Runs nicely warm, a little more sluggish cold. its 30* outside.
When i had my car dyno tuned at the shop about 6 weeks ago, they said my ECU does not create a constant build A/F wise. SAFC wil correct this and kinda "fine tune" my Air Flow.
Still so happy i found that disconnected vacuum hose from my FPR.

[cotbu]

Bull defecation! Your weren't tuned! At least not correctly! There is nothing an S-AFC is needed for on a dyno tuned engine period!

they said my ECU does not create a constant build A/F wise.
WTF, does that mean to you? Bull defecation!

[Sx-mad]

Also what's a accel dfi fuel pressure regulator?

This engine ain't gonna last long lol


Ha ha just googled it

They are no use for your car. Doesn't even say if its rising rate. I guess that's why the fueling is not right.

U have to put an fpr on the with a rising rate of 1.1ratio

[SilviaT]

Also what's a accel dfi fuel pressure regulator?

This engine ain't gonna last long lol


Ha ha just googled it

They are no use for your car. Doesn't even say if its rising rate. I guess that's why the fueling is not right.

U have to put an fpr on the with a rising rate of 1.1ratio

Ha should I just trash the accel dfi and get a different Fpr? And not even bother to get a safc?

[SilviaT]

Bull defecation! Your weren't tuned! At least not correctly! There is nothing an S-AFC is needed for on a dyno tuned engine period!


WTF, does that mean to you? Bull defecation!

Sorry they never really "said" that. Wtf does bull defecation even mean and why do you keep saying that?

[KendallH]

Ha should I just trash the accel dfi and get a different Fpr? And not even bother to get a safc?

This is what I've said in my last 3 posts.

[SilviaT]

Well thank you Kendall

[SilviaT]

Any suggestions of for a better FPR? And how do you know i have the wrong one?

[e1_griego]

Just put a stock fpr on it.

edit: looks like you have aftermarket rail. Aeromotive or something of that caliber is what you should be looking for.

And dare I ask what shop you've been going to?

[Sx-mad]

As above or as long as it has a rising rate of 1:1 ratio and is set to the correct base pressure

[SilviaT]

I have a fuel rail yes.. Idk what brand it is.

[SilviaT]

TrackForged is the shop. and i guess i will look for a new FPR. im on a budget so i really just need something that will rid me of this headache!

[Croustibat]

When i had my car dyno tuned at the shop about 6 weeks ago, they said my ECU does not create a constant build A/F wise. SAFC wil correct this and kinda "fine tune" my Air Flow.
Still so happy i found that disconnected vacuum hose from my FPR.

That disconnected vacuum hose was creating a serious boost leak, which is why you car was bogging down.

Stay away from that shop, really they have no idea of what they are doing. Do you realize they "tuned the FPR" without seeing it was unplugged ?

The SAFC will do nothing on its own, it will enable you to correct the AFR, and it is useless anyway - read the next msg.

Ha should I just trash the accel dfi and get a different Fpr? And not even bother to get a safc?

Get the stock FPR. Enthalpy (or any off the shelf tune) is made for these. You will have a hard time finding an FPR that reacts EXACTLY like the stock one ( they all take a little different time to react on pressure changes).

An SAFC is a tool. You cant use it without knowing how, nor without an AFR wideband sensor; and it can only adjust fueling, which is worthless. A tune is about timing first and foremost. Timing makes power, and it also makes holes in your engine if you dont set it right. Adjusting only fueling is useless. So dont get one.

[SilviaT]

Thank you guys thread closed.

[cotbu]

If your boost gauge was t'd to the fpr, you would've known it wasn't hooked up!
C'mon Bull defecation, really?;)

[SilviaT]

If your boost gauge was t'd to the fpr, you would've known it wasn't hooked up!
C'mon Bull defecation, really?;)

Boost guage wasn't t'd off to my fpr.

[cotbu]

And I said
If your boost gauge was t'd to the fpr, you would've known it wasn't hooked up!

[SilviaT]

I heard that's not good to do.