328 turbo boost problems!!!!

328B · #1 (**permalink**) 02-22-2005, 02:13 AM

Hi all , this is my firts post so i hope you can help me.

i have a 328 turbo which is pushing out more power at .5 bar than it is at .8

i am running a garret t4 turbo with 6 328 injectors and 2 extra injectors and a perfectpower 6 chip ( piggyback system),and ngk8 cold spark plugs

I was told reason for power loss at .8 bar is maybe the ignition or the turbo is to small.

please help

nondescript · #2 (**permalink**) 02-22-2005, 05:36 AM

First: I know very little about turbo setups. That said, I can tell you that most kits people talk about use 6 larger injectors in place of the originals. I'm really curious what you mean by "2 extra injectors" - sounds like an odd setup. So naturally that is what I question first. (enough fuel delivery for the extra air at 11 psi)...

Seems like 8 or 9 psi (0.5 - 0.6 bar) is about the accepted safe limit on the stock engines too... Beyond that and I've heard you are risking head gasket failure, unless you are running something more solid.

Also, post a dyno-chart if you have one, the picture should tell "a trained eye" a lot about what the motor is doing.

328B · #3 (**permalink**) 02-22-2005, 06:06 AM

with a piggyback system (perfectpower) i have been told that they like to run the standard injectors and add two extra injectors on the inlet. so when your are running the car out of boost it's running on the standard map and as soon as you enter into boost the other two injectors come in to keep the air/fuel ratio correct.(thats how it was explained to me) and the car runs at .5bar very smooth and lots of power.

but i want to get the car up to about 1 bar of boost , it was built to handle 1.2 bar (so i'v been told)

.

and i don't have the dyno-chart yet.

nondescript · #4 (**permalink**) 02-22-2005, 06:19 AM

1.2 bar... yikes. I'm going to step aside and let someone who's done this add their $0.02... At that pressure I'm hearing all kinds of things like lower compression pistons and forged internals and things I don't have any experience with.

Oh, take a serious look at the programming of that perfectpower system. Sounds like you are asking two seperate systems to work together with out talking to one another, the factory ECU might be putting up a fight.

Sorry, that's all I got.

328B · #5 (**permalink**) 02-22-2005, 07:06 AM

nondescript thanks for your input and maybe your right about the perfectpower system,because the car isn't running out of boost so that tells me (i think) that the turbo is big enough. but i can't get a straight answer form the mechanics that have worked on it.

so if anyone has gone through this or can help i would be gateful.

GeorgeSmooth · #6 (**permalink**) 02-22-2005, 08:37 AM

I dont reckon those two extra injectors arent enough for the extra boost you running. Remember that its a big turbo and the fuel needs will go up exponenially when you move from .5 to .8bar. You probably looking at making an extra 50kw with that boost increase so maybe you are having a fuel starvation problem.

328B · #7 (**permalink**) 02-22-2005, 01:22 PM

i think if anything the car floods as it goes over .6.
it feels like as it goes over the .6 mark the car pulls back like its drowning, you see the car boost but no extra power just a loss of power.

GeorgeSmooth · #8 (**permalink**) 02-22-2005, 01:40 PM

Have you had a air fuel ratio meter put on it to see what the mixtures are like.

328B · #9 (**permalink**) 02-23-2005, 06:43 AM

i haven't put one in , but the car is on the dyno and they keep telling me there is to much fuel and they still can't get good power at higher boost. do u guys think it could be that the rpm increments are to big ?

MPerfect · #10 (**permalink**) 03-03-2005, 09:43 PM

i think its tuning, probably need to lean out the fuel up top. You could probably take out one of the extra injectors, but still its needs better tuning. A good spark wouldn't hurt either.

Frank de Jonge · #11 (**permalink**) 03-05-2005, 02:16 AM

Got pics of the setup??

zoran · #12 (**permalink**) 03-16-2005, 08:19 AM

Would a T60-1 Garret be great on a 328 ???

chris18T · #13 (**permalink**) 03-16-2005, 04:09 PM

It sounds like you are getting too rich up to which is, as you put it, drowning it. Too little fuel can cause timing to get pulled, as well as too much.

You need to take it to a decent shop and get it dyno tuned properly. They should be able to get those injectors to run right. If not you might need to use smaller injectors. Personally I would of just went with 6 larger injectors instead of adding 2. I don't know about your fuel management system, but any system worth it's weight should be able to adjust fuel at certain RPM ranges.

uvmotors · #14 (**permalink**) 03-24-2005, 07:20 PM

I got a 95 M3 with a custom turbo kit GT30 turbo, with AA tuning,
but the car is not runing right, it pulls up to 5LB of boost, then it feels
like drowning, the power goes down while the boost increases to 9LBS
Iam searching for the problem with AA, if I find any answers I will let you
know.
Basem

chris18T · #15 (**permalink**) 03-24-2005, 07:44 PM

man, i don't know much about AA, but they don't sound like too good of a shop to get a BMW tuned at. maybe it's because i've only read bad posts about them?