92 hatch

Hey People,
I just got my kit done like a few days ago, took her out for some boosts and I must say it was mighty nice. Here's my situation though as it sits now. I bought an Airtex in line fuel pump, and installed it on the hose between the fuel filter and the fuel rail on that hose. I took it out and ran it a while and then upon my lucky decision to stop at a store, I got out and noticed that one of the hoses had ripped itself due to the pressure that was built up inside my fuel hose there where it attached to the pump. Anyways, I was lucky that there was an explosion from the leakage of gas right under my hood, but I had the fire extinguisher in hand ready to put out any blaze that would have happened.

To sum it up, I'm wondering it anyone has any ideas about whether I should just not go with the in line pump and just go with the 6:1 FMU that I have hooked up. That's all the management I have on the car, and I would like some opinions and advice on what I should do. I loved the car while it was boosting, and my computer is fried so I can't really tell how rich she is running when on boost or not. I'd love to get it goin ASAP so I can take it out, I was keeping up with a new V8 Firebird while it was working, and I also took on an S2000 but he beat me goin uphill, the turbo wasn't in full boost when he took off. Anyways, should I keep the airtex fuel pump? Go with internal fuel pump in the tank? What should I do for management, and if I just run it without the fuel pump, do you guys think the fmu will be good enough? I know that the management is basically the most important part, and I just need some help setting it right now that it's on there and ready. I'll post some pics and info once it's goin again, thanks for any help,
Patrick

Dr.Boost

Ditch the inline and get an intank. How much psi are you running? You should be fine with just the FMU if you are only running 5-6 psi. Are you using check valves or a missing link?
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92 hatch

Hey,
I'm using check valves, and the 6:1 FMU, I'm only running 7psi max at my redline is about where I hit it, should I set it up to hit 7psi and open the wastegate earlier than that or is that how it should be? It was decently quick like this when I had 7psi at my redline. I could spin the tires in first while going about 25mph without touching the clutch. Anymore help will be definately put to use. I plan to do a D16z6 built swap in the next year and run the boost up to about 12-15 at the track, so an in tank pump will probably work better for this too down the road, right? I'm already addicted to the boost, I loved it before I had this problem and I can't wait to get it goin again!!! Thanks!

Dr.Boost

You need to do some adjusting to your wastegate. It should hit full boost way before redline. What kind is it? What is it rated at?

An intank will be crutial when you plan on going to 12 psi. Just buy one now and save yourself the headache.
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92 hatch

sweet mother of god!!!!!!! so when do you think it should hit full boost? I was thinking it was awesome when I first started it up before I messed with the wastegate, I had it set up when it was first on there and it was hitting about 7psi at like 3k rpms, it had some serious torque and get go, are you telling me it is supposed to stay like that all the way up to the redline? If so, that would be spectacular!!!!!!
I guess I was under the impression that the boost should come on later for some reason. So the wastegate should open you think at about 3k on the rpms?
I think I'm gonna go with an intank fuel pump, and sell the in-line one that I had, do you know how much fuel pressure the in take of like 255lph will run on the fuel lines? Awesome man, I'm hella excited about running the boost lower in the rpms because it takes a while to get it up there otherwise. I like how you can tune the turbo to the way you want to drive the car, it's the best thing ever

92 hatch

Oh, and I forgot to let you know that it's a baby T25 mated to the sohc vtec motor, man it is gonna be sweet when I get it goin, I bet it's gonna have some serious low end if I run it at like 7psi around 3500rpm or around there, and then let the wastegate open from there up, dude, it's gonna rock ***!
The wastegate is just the external one that comes along with the T25 Garrett, when I first hooked it up, I could tell that it was gonna go way more than 7psi, so I took it off, bent it down and did some playing with my manual boost controller so that the boost would reach the max of 7psi at around 6500 or thereabouts.
Thanks a lot DrBoost, it's helping me in the process.

Dr.Boost

Your fuel pressure depends on the fuel pressure regulator. If you still have a stock regulator it will be around 37psi. The intank 255 will be more than enough.

You meant an "internal" wastegate right? You have me confused now. You said it wasn't hitting 7 psi until redline before, but now you say it hits it at like 3500? 3500 sounds more like it. You should get an adjustable wastegate that will allow you to have the flap shut all the way and use a manual boost controller to raise it. That will eliminate the lag you have right now.

Your turbo might not handle a whole lot of boost at high rpm, but it should get there very fast.
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92 hatch

So do I need to get an adjustable fuel pressure regulator to go with the FMU? The FMU is on the return line of the fuel. I believe it is 6:1, that is what I was told. I didn't run colder spark plugs at first, but now I have them on there and I have the fuel hose that I needed, I went to the junk yard today and the hose, and it was up and running again, but it was missing pretty bad, so I put the new plugs in, and now it seems to be good again.
Anyways, I don't know how to set the boost up, I have the T25 and the wastegate with the rod setup that came with it, and I have a manual boost controller that I also have hooked up. Anyways, I can't get the wastegate to open around 4k rpm and stay open up to the redline, but I bent the rod and can dial it in to where it reaches maximum boost (7psi) near redline, but I can't get it to hit that amount of boost earlier in the rpms without it wanting to keep on building up, like up into the 8-9psi range, which is dangerous. Do I need to bend the wastegate more? Should I be bending the wastegate? How do I go about getting around 7psi around 3500rpms or so, and keep that boost up to the redline? And is this safe to do on my stock motor? Thanks

Also, I am planning to go with the log manifold (tubular), in the near future and maybe switch to a Tial wastegate that would be on the main junction of the runners, anyways, will this fix the problem if I resort to this now? Will I reach 7psi around 3500rpms, and stay there until redline? Thanks

Dr.Boost

The FMU will raise the fuel pressure without an adjustable fuel pressure regulator. A fuel pump will not. A fuel pump will supply volume more than pressure. The pressure is regulated by the fuel pressure regulator and the FMU in your case.

If you are planing on getting an external wastegate you should just deal with what you have for now. I personaly don't like the "log" style manifolds, but to each his own. If you were to keep your current manifold with the internal wastegate I would say you should get the right wastegate actuator for the job. You need an adjustable one that is set at 5-6 psi so you can keep the flap completely closed and adjust it with the boost controller. This will eliminate your lag and allow for a more accurate boost setting.
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92 hatch

Cool,
thanks for all your help, do you know where I can get a wastegate like this? I have a kit that turns my wastegate rod into an adjustable unit, is this what you're talkin about? Thanks