Hi,

I'm fairly new at this TBI stuff. My car currently is mostly stock, and for now I intend to keep it that way for a while. Mostly stock.

I did fit a full exhaust, open element air filter and intend to follow up some of the advise in the ultimate TBI mod thread. One of the mods I see as particularly useful is making the stock fuel pressure regulator adjustable.

One topic I found no information on is how to fit a permanent fuel pressure meter in the engine bay.

Where would I best connect this to without causing any problems?

 

It would be easiest on the feed line right next to the alternator.

On a side note, a fix FP gauge in the engine bay is not wery practical, as sometimes it is good to monitor FP under load.

With this one you can fix the gauge under the windshield wiper for some accurate testing http://www.actron.com/product_detail.php?pid=16175

Some good information https://www.thirdgen.org/forums/tbi/...sure-test.html
https://www.thirdgen.org/forums/tbi/...-pressure.html

 

A fix fuel pressure gauge in the engine bay is nt practical when I´m in the car but I figured that with the way TBI works, I should be all good as long as the fuel pressure is good in idle. I mean, it´s the fuel pump providing the pressure and with the pressure valve that makes fuel pressure a fixed value, up to the injector pod right?

I wanted to convert the pressure valve to be adjustable so I can play around a bit with the pressure range supported by the valve fitted and see what it does.

Fixed fuel pressure meter is relative I guess. In the future, about 1 or two years from now, when I have the rest of the car sorted out I do intend to change heads, camshaft and intake manifold. At that point it will become unavoidable to replace the current fuel setup alltogether (bigger pump, stronger valve, possibly bigger injectors) so at that point it would make sense to move the fuel pressure meter to the inside of the car.

The Actron unit looks interesting allright. I might actually prefer the since it´s a straight piece that would go in the TBI unit directly, and could, provided I plug it up if not in use, be left there I guess.

 

I had a situation with a weak FPR (fuel pressure regulator) spring, where pressure would drop under load.

But of course once set up, to check FP from time to time, is anough.

It is a good idea to start playng with FP, this will help to get the upgrades running wenn that time comes.

A stock LO3 would probably benefit more, by playing with the SA tables, they run already on the rich side, from the factory.
As you know, hard to beat the EBL flash, wen it comes down to making changes to the tune, easy and quick on these cars http://dynamicefi.com/

Ex. https://www.thirdgen.org/forums/diy-...o3-lt1cam.html

 

Whatever you do, do not run a line inside the passenger compartment. Get the appropriate gauge with a sendingunit so no fuel enters the passenger compartment.

 

http://marine-performance-parts.com/...843505774.aspx

that goes on your throttle body then you get a gauge. That site has them too to connect to it. Summit racing also sells gauges cheaper. more PSI also.

 

Read something like that on F-body nation

ALDL was rather certain I´m running ever so slightly lean atm. BLM at 117´ish. That´s why I´m interested in fuel pressure.

An EBL unit is planned for the future. I mean, once I start replacing major parts I will have to find one way or another to have these tables right, and the EBL unit seems a more comfortable way of doing this then burning stacks of PROMS.

@ Eaglemark, thnx for the heads-up. I wouldn´t be comfortable running a fuel line into my dashboard. I´m a non-smoker. No need for fires.

I guess an electronic sending unit would be the best way to go when setting up a fuel pressure gauge in the dash.

@ undercover, that´s the exact same piece as on this site:
http://www.rvmorsemachine.com/newproducts.htm

Only costs $10 more. That´s the exact piece I´m looking for however. Would perfectly fit my needs. Just have to consider if it would be cheaper having that sent to here, or have someone machine a copy of it over here and not have any shipping cost

 

i know morse machine is more hence why I gave the link to cfm tech. order a gauge from summit for 16 dollars instead of 40. And you can order a gauge that goes from 0-30 or 0-60 etc..

 

Wich shows the ECM is pulling fuel, because the O2 sensor is reporting rich.


Would be kinda hard to read the FP gauge if mounted at the back of the TB under the aircleaner. But not sure, I never put it there.

 

Which is one of the reasons why I want to find out how much fuel pressure goes into the TBI unit in the first place.

WinALDL says something about engine running lean.
Still, BLM is 117' ish which, when I read everything on here right should mean the engine is actually running rich rather then lean.



Ever since this reading a lot has been changed, so I'll try and get a new WinALDL reading somewhere start of next week.

 

Let's ignore that mixture status (o2volt low or INT high flag idk) for the time being...
Batt volts are WAY high.

Everything else indicates rich..o2 volts, IAC counts...BLM low may have sent INT high causing lean flag...low baud rate & no .bin insight suks.

I would hook up w/TunerPro RT for another perspective, get to know your .bin & .xdf, that will help you.

 

I need to get into this tuning stuff so I can decode what the hell you guys are saying. haha.

 

Words of wisdom.

I had a situation on a stock 89 TBI, the rich flag was showing up almost all the time with the winaldl program, FP was around 7psi, fuel pump was bad.

 

Ignoring mixture status will be easy. ... done ...


Car smells slightly rich as well.

After this reading I replaced battery, alt, sparkplugs, distributor and cables most of the front and interior wiring harness (I never knew I had lights in the footwells!) and a bunch of other stuff. Voltage is now as it should be.

One pressing issue I have to deal with is a cracked header. Headers are due when cash is there, whcih might take a few weeks since shocks and brakes need to be exchanged as well.

I'll definately have a look at this w/Tunerpro RT thingy tonight. Thnx for the reply. You do make more sense then WinALDL has done for a while now.

 

Exhaust leak will pull fresh air in (oxigen), the O2 sensor will start adding fuel.

I have a pair of used edelbrock headers, taking up space in the basement. Let me know.

 

That sounds interesting. Do they come with a 2 1/2" Y pipe?
I intend to get somewhere around 300 FWHP from the car, which would have me happy for now and figured 2 1/2" will do for that, so I converted the exhaust up to there to 2 1/2". Would not have any use for 2 1/4" though.

Oh, and what would you want for those?

 

No y pipe. PM if interested.