So I haved dumped a ton of money into this car.. and I cannot tune it for the life of me. After I got it back from the shop the car drove nicely but you still couldn't get on the gas very much or the motor would start to bog heavily. Anyways I figured I could live with that for awhile and just be light on the throttle every where I went.

That doesn't work. Anytime the car gets a load on the motor its bogs way down and I have to pull off on the side of the road and restart to clear what I believe is excess fuel? Its fuel pressure was at 3psi. I bought a malpassi fuel regulator which didn't help. Now its at 5 psi and the car still reacts the same..

My fuel setup
13b fuel pump
Stock gas line sizes
Malpassi regulator which does not regulate below 5 psi
(The psi @ 3 was achieved by teeing off the main line and having run back to the tank.) So we have been limiting the pressure by doing that.

Symptoms: any time there is load it bogs and dies... the car has no power its like the turbo is not even working. The turbo only boosts under extreme loads. Why is it that way? I drove a sti yesterday and it was building boost just driving around in the lot.

 

there you go

 

woot your the man thanks for the help. Im really shocked that your helping me out this much considering im just some random guy in wv.

 

thats what makes this forum great.

 

Did I miss something? Did 680 cast a spell?

 

so what was the answer?

 

the fact that sti's are different than boosted 12a's?... ...btw i don't know much about turbo's but as far as i know you need a fpr that would increase/decrease fuel as needed..right?...so maybe yours is just set to a certain psi...idk...correct me if i'm wrong, i'm trying to learn more about it since i'm going this route..eventually..

 

gap down and go to GM HEI igniters , i suspect your blowing out the candle

 

See its a drawthrough set up. So instead of hooking up a regulator im suppose to hook a basic pump straight to the carb. The plugs are gapped to .15 so no spark issues. I have a 13b pump on there and it is flowing way to much volume to engine. The turbo can't hardly spool cause its being overloaded with fuel.

btw 680whp12a called me up and is helping me out with this a lot. This forum rocks hopefully its as simple as too much fuel.

 

+1

 

So a draw-through setup doesn't need a rising rate fpr? Interesting, I'll have to remember that. Does that apply to draw through air metering (such as the vam) as well or no since the fuel is delivered further downstream?

 

cool thanks for the info .....this thread was a bit missleading lol, if you just read it w/out knowing that 680 is helping you, it seems like he's being a dick and like you're being a smart-*** lol...thanks for clearing that up too lol.

 

You want to keep a constant pressure differential between the air and the fuel. So if you have boost where fuel is added to the air, you need a boost-referenced FPR.

 

mr 680rwhp is indeed the carb turbo specialist!!!! he has done plenty of them...

 

I don't think you need fpr atleast from what I understand. Its pretty much just straight line from your fuel pump. Because the turbo is just drawing air through the carb will do its job and match. Blow through you would definitely need one.

 

very nice
a draw thru fuel system is treated the same as a N/A fuel system, blow through is totaly different tho, hi-pressure fulel pumps and boost refrence rising rate regulators and so forth..

 

thanks chin, see you at sevenstock

 

Nice to see great help from a member.