Alright, maybe some of you have a suggestion why my motor quits out under boost
 

Hey guys,

I have a b16 with a t3 on it and a tial wg set at 7.5 pounds. Im using a vafc hack set correctly with 450's. The car runs good and can boost. I just did a compression check and the numbers turned out great. The problem is when I hit full boost at 7.5 pounds around 5k rpm, the motor like literally just wants to stop accelerating entirely. It doesn't ping, clunk, or chug...or make any nasty noises.....it simply just quietly wants to stop any acceleration. Its not the ecu going into limp mode because it doesn't throw a cel and I don't have to reset it. Any ideas what this may be?

Re:Alright, maybe some of you have a suggestion why my motor quits out under boo
 

Mabye vtec isn't kicking on? just a thought.

Re:Alright, maybe some of you have a suggestion why my motor quits out under boo
 

Are you using a filter? Try some screen and see if that fixes it for you.

Re:Alright, maybe some of you have a suggestion why my motor quits out under boo
 

That sounds like a good idea, i'll remove my filter and post back. Thanks. Btw, when I say am not accelerating at full boost, I mean I literally have to change gears because the rpm increase is coming to a dead stop.

Re:Alright, maybe some of you have a suggestion why my motor quits out under boo
 

Nope, didn't fix it.

Re:Alright, maybe some of you have a suggestion why my motor quits out under boo
 

what size T3? if its a smaller trim size then its prolly running out of steam up top.. thats what my RHB5 did at 5500rpms, just felt like a normal car after that.. just an idea

Re:Alright, maybe some of you have a suggestion why my motor quits out under boo
 

No, I mean I literally CANNOT accelerate once i hit full boost.

I figured it was my intake sucking in exhaust gas from the wastegate opening under hood since I don't have a return for it welded yet, but people said that bwouldn't be it, and even after blocking the wg port off it still does it.

Re:Alright, maybe some of you have a suggestion why my motor quits out under boo
 

damn that really sounds like a cluster ----.

Remember a motor needs air, fuel, spark to operate.

Think it's possible that the boost is pushing fuel away.. like on a carb motor with a non boost-referenced essentric fuel pump?

Re:Alright, maybe some of you have a suggestion why my motor quits out under boo
 

im running into the same problem.im also running the tail wg. could it be the check valves are ready the boost.

Re:Alright, maybe some of you have a suggestion why my motor quits out under boo
 

That could very well be it. When I first got my setup together the half downpipe I had put exhaust gases into the intake. The car bogged really badly and would hardly go anywhere, I took the downpipe off and it fixed it. But if you say you blocked it off then I guess that's not it.

Re:Alright, maybe some of you have a suggestion why my motor quits out under boo
 

Well I tried blocking the flow of gasses to the filter off from the port with sheet metal, not the port itself.... looks like I'm gonna have to go make a trip to get a wg dump welded on and then I'll get back to you guys.

Re:Alright, maybe some of you have a suggestion why my motor quits out under boo
 

what fuel pump are u using with those 450s?

the stock fuel pump WILL crap out.
also do you have a wideband and what fuel management are you using? maybe your timing falls off way too much; that will kill power.

and i dont think your motor will outbreath a t3 turbo.
dodge put .42/.48 t3's on their 2.2/2.5l engines that can make over 300hp with the stock turbo. it moves a lot more aire than even a b-series.

Re:Alright, maybe some of you have a suggestion why my motor quits out under boo
 

You thiink the dodge engine moves more air then a b-series with vtec head?? the dodge doesn't redline at 8K.
I think it may be your exhaust...using stock exhaust?
I had the same problem..with a D-series hooked up stock exhaust and the car just died at 6K
everytime just went to a dead stop like you mensioned.
Ride with open downpipe or get at least a 2.5" exhaust...the turbo should be ok till 7K on the b-series it will eventually die after that, but will just feel like NA

Re:Alright, maybe some of you have a suggestion why my motor quits out under boo
 

Hmm, well honestly guys the more I think about it Im really leaning towards it being the intake sucking in the exhaust gas from the open wastegate because think about it, it only happens at full boost when I hear the wg open, its a very sublime feeling of not wanting to rev higher....different then running lean or rich or pinging etc... Also my wg port points directly at my filter only about 6 inches away.
I'll put a dump tube on it and report back to you guys.

To your posts:

I am using the stock pump but my underhood fuel pressure guage reads ~35 psi at idle so I hope Im ok there. The exhaust is a 2.5 custom straight through. I said above Im using the vafc hack garbage. Also my turbine is a .63/.48 so I know it flows enough cfm's.

Re:Alright, maybe some of you have a suggestion why my motor quits out under boo
 

You sure you just arent running REALLY rich there?

Try leaning it out slighty and see what happens...

Re:Alright, maybe some of you have a suggestion why my motor quits out under boo
 

Well I'm running -34% at 6,000 rpm past like Turboef recommends in the faq, so it shouldn't be too rich to the point I can't accelerate....but who knows....maybe I have a stuck injector or something.

Re:Alright, maybe some of you have a suggestion why my motor quits out under boo
 

I think at -34% there is too much fuel. Change your settings to -36 from 6000rpm to redline on both the wideband HVT and the narrowband HVT. Test the car and if needs be, gradually lower the amount of fuel.

Re:Alright, maybe some of you have a suggestion why my motor quits out under boo
 

My car did that at 1psi for a while.

My A/F gauge was reading "lean lean lean" all the time ( although it still cycled at idle ), so I added a fuel pump, still the same problem. So I added an AFPR and turned the presure up some, but that didn't fix it ( all the while the A/F gauge kept reading "LEAN" ). Finally I posted and asked for help and a few people to lean it out a little, and I was like "no way !!! I don't wanna blow my car up, and if its running too rich its not gonna blow-up". Finally I got desprate and turned the AFC setting down to lean it out a little. First run the car hauled ass.

Its scary to lean a car with on wideband out, but my car still runs rich, and the damn A/F is a POS. The A/F still says "lean lean lean", yet my plugs need cleaned about once every week b/c they are so black...

I'd say try -40 AT LEAST.

Also... a .48 turbine isn't going to choke the exhuast off so bad it won't rev to its redline ( power will fall off, but not competely stop it from gaining rpms ). If it was a RBH25 or something, I'd " maybe ".

The honda prob. does flow more than the dodge motor for 2 reasons.
#1 the dodge cyl. head isn't a "crossflow" deisgn.
#2 the honda does turn another 2K Rpms more.
Not to take anything away from that "hammerdog" torque monster.

Re:Alright, maybe some of you have a suggestion why my motor quits out under boo
 

thats bullshit the stock pump will work fine with those injecters.

Beau

Re:Alright, maybe some of you have a suggestion why my motor quits out under boo
 

im with the afc settings being the problem.

list them all, lo/hi % and all fuel trim settings.

Re:Alright, maybe some of you have a suggestion why my motor quits out under boo
 

Narrow and wide throttle settings are the same since my crossover is 98%lo/99%hi.

1000rpm -41%
1500rpm -40%
2000rpm -40%
2500rpm -40%
3000rpm -40%
3500rpm -38%
4000rpm -37%
Vtec@ 4500rpm
4500rpm -36%
5000rpm -35%
6000rpm -34%
7000rpm -34%

Re:Alright, maybe some of you have a suggestion why my motor quits out under boo
 

maybe for a tiny turbo; you slap a t3 on a b16 with 450s and your fuel pressure will start dropping before you top out. i didnt do it; i have a friend who did.
but im sure with a puny d16 and a t25 the stock pump should be fine for a while

Re:Alright, maybe some of you have a suggestion why my motor quits out under boo
 

Im getting a dump tube for the wg welded up tomorrow, in the meantime how do my fuel correction values look to you guys? Anyone using a vafc and 450's run anything different?

Re:Alright, maybe some of you have a suggestion why my motor quits out under boo
 

HERES THE UPDATE:

Went and got a short dump tube welded on that goes past the filter and vents to atmosphere under the crank pully. Drove the car out of the shop warmed it up, got on it for a freeway onramp and I got full boost and acceleration to go with it! I still need to get a hold of a wideband though and tune the fuel values because I run so rich that I stink of gas at idle and cruise, and also I can feel the motor run rough at points where I think too much fuel is being added. Can any of you with a vafc and 450's please post your settings that are working for you.

So in conclusion, it was the fact I was sucking back up my exhaust gasses when the wg opened because I didn't have a dump tube that was preventing me from going past 6k.

Re:Alright, maybe some of you have a suggestion why my motor quits out under boo
 

I win bitches!!!!!!!!!!! Do I get some money? :P

Re:Alright, maybe some of you have a suggestion why my motor quits out under boo
 

Here are my new fuel settings that are working better for me:

Narrow/Wide and Hi/Lo are all the same.

1000 -42%
1500 -42%
2000 -41%
2500 -41%
3000 -40%
3500 -40%
4000 -39%
4500 -38%
5000 -37%
5500 -36%
6000 -36%
7000 -36%
8300 -34%

Tell me how they compare to some of yours.