Stu @ M Developments

iTrader: (12)

Im a tad confused as to why your confused.

Pipe off = 3.5bar.

Pipe on = only a test done by idiots as an engines vac draw varies depending on hundreds of things.. cams, ports, timing.. blah blah bollox blah.....

To get around the 2.5bar mark would require you to get your YB to pull a HUGE vac at idle, which, aint happening.

Reality.. Std YB pulls around 3bar at idle with pipe on, but is subject to idle speed, cam timing . blah blah bollox blah... but as i said, pointless test.

Turbosystems

iTrader: (5)

perhaps he means decel vacuum 12omph down hill in first gear lol.
Perhaps he has mistaken 15 inches of mercury for 15 psi

Anonymous

Gauge isnt even on there now, and you are right it wasnt a very accurate one, it was just what was on there to begin with.

Ive set the fuel pressure on my current L8 chip to give me a lambda reading im happy with rather than just make an assumption as to what it was mapped with and just blindly dial in a number, so i'll refrain from doing as you tell me to in this instance as your advice sucks frankly and in this instance i happen to know better

St3V3_C

Is there any merit at all in checking that it is 3.5bar less what the vacuum is at that particular point in time? (As well as the pipe off test of course.)

Anonymous

You'd just be adding together readings and hence multiplying up the innacuracy if you do that.

If you want to know what it is with the pipe off then its pointless doing it with the pipe on and then trying to subtract the effect of the pipe really.

Turbosystems

iTrader: (5)

interesting way of doing it we normally map them rather that twidle the regulator

Stu @ M Developments

iTrader: (12)

The only worthwhile test is to put some pressure into it and see what it does. I always test em to 2.5Bar absolute which should show 5bar fuel pressure.

That obviously gives you your fuel pressure at 1.5bar boost.

Anonymous

Yep, far better option which i myself would have opted for if i had the hardware handy to write an L8 chip, but i dont, so until ive installed my SECS (which you can map with a normal laptop and serial lead) thats not an option.

When installing someone elses chip (like alex is here) i would always recomend setting the FP based on lamda, as if his injector flow rates are a little different or his FP gauge reads differently its more like to lead to an error, where as if you go off lamda at least you know if there is a problem or not and know wether or not you can sort it with FP.

Turbosystems

iTrader: (5)

the fuel pressure reg has a working range min and max if you start the basic fuel pressure 1 bar higher then in effect it bottoms out 1 bar earlier

Anonymous

Very good point Stu, given how much these things vary by!

Anonymous

Yep, although on a T34 he wont be hitting it even if he did need to dial in a couple of psi extra start pressure (a bar would indicate a pretty big issue somewhere!)

ImaRacing 700

Well done Tony and Stu Showing Chip he really knows very little.



Will he ever admit this? No Sir he will keep coming back till you all gone home

Turbosystems

iTrader: (5)

they were a very good acurate regualtor if you are having problems with fuel pressure then there is something wrong pump ,pump wiring reg etc etc etc they are old and tired

Stu @ M Developments

iTrader: (12)

Turbosystems

iTrader: (5)

your not old stu you just look it

Turbosystems

iTrader: (5)

a t34 will make the boost it may not hold it on a yb at 7000 rpm but it will certainly be good for 38 +psi at lower rpm .If the reg bottoms out the pump will stall very dangerous for pump engine and wallet lol

Anonymous

Phil, im quite happy to admit that im not an anorak when it comes to the standard spec of cossies, Ive got a good understanding of engines in general and how they work but i would never claim to know all the details of what was chosen originally as standard cossie spec.

My original comment was (as you seem to making out ive said something i didnt so im guessing you havent even read it?)
There is nothing in that which suddenly demonstrates that i know nothing about engines, when i first got my cossie it was showing around 2.5 at idle, so thats what i quoted and i specifically put "I thought" so as not to mislead anyone by making out i acuatally knew for a fact when i wasnt sure.

Anonymous

I'll wager you a quid that the setup he has doenst allow the T34 to run to 38psi on his car, and i know it doesnt on mine

Interesting to hear thats where the regulator tops out though, cheers for the info, you learn something new everyday!

Turbosystems

iTrader: (5)

it is unwise to bottom your regulator but fine to regulate your bottom so mike rainbird says

Anonymous

Mike Rainbird

iTrader: (3)

Bastards .

Turbosystems

iTrader: (5)

or bum stards as mike would say