Before Turbo Basics: Turbo 101

[Py7h0n]

I thought that this might be worththile adding to the TOP of turbo basics so people who know nothing about turbo setups can understand them a bit more (with Graphical assistance )

http://www.cse.uconn.edu/~yelevich/turbo/turbo.html

[LowTegra]

www.honda-tech.com
read the forced induction section , ull learn everything youd ever want to know, best resource ive ever found, some big guns on there.. nhhra team engineers even post there alot..

[monsterbishi]

http://auto.howstuffworks.com/turbo.htm

it couldnt be easier to understand.

[vtec2nv]

Hey I keep getting mixed stories about FUEL ISSUES

Ive got a TD05h sitting on my ZC DOHC EFI and people tell me to run b00st I need an aftermarket FUEL PRESSURE REGULATOR

is this true??

Or will my Chipped ECU change this??

[BTLF3D]

no you dont need a aftermarket FPR, alot of people run on a standard one

[d16a7]

Originally Posted by BTLF3D

no you dont need a aftermarket FPR, alot of people run on a standard one

yes but the factory ones start losing / lower in pressure ie dont hold the WOT factory pressure higher in the boost.. around 10PSi + it starts lowering... will try find the link on turbod16...

but up till then should be fine.. provided you have big enough injectors...

your chipped ecu with factory map sensor will only take you up to around 11PSi so you should be fine..

and chipped ecu will be able to control everything required...

[crxmad]

Just like the MAP sensor on your engine, the fuel pressure reg will only cope with a smidgen of boost like 4-6psi or so.
The factory fuel pressure reg is not a rising rate type ie 1:1 which means for every PSI in the intake manifold = an extra PSI of fuel pressure.
This is important as rising manifold pressure impedes the delivery of fuel to your engine which in turn can lead to engine failure!!

As an example,if your baseline fuel pressure is 30 PSI at 0 PSI guage or the point just before boost builds and you are running 10 PSI boost then total fuel pressure should be 40 PSI.
Obviously this is a basic rule of thumb and other variables within your setup will determine the optimum pressure etc, but a trip to the dyno to fine tune your fuel system would be highly recommended in reguards to both the safety of your engine as well as power output.

[b16a2]

Originally Posted by d16a7

yes but the factory ones start losing / lower in pressure ie dont hold the WOT factory pressure higher in the boost.. around 10PSi + it starts lowering... will try find the link on turbod16...

but up till then should be fine.. provided you have big enough injectors...

your chipped ecu with factory map sensor will only take you up to around 11PSi so you should be fine..

and chipped ecu will be able to control everything required...

yeah but who cares if it looses pressure, as long as it does it consistently, then your fine, as a tune will incorporate the lower pressure diffirential, i think the problem with factory fpr, is they tend to fluctuate the pressure at higher psi levels and are not consistent in the pressure regulation = bad

[crxmad]

Originally Posted by b16a2

yeah but who cares if it looses pressure, as long as it does it consistently, then your fine, as a tune will incorporate the lower pressure diffirential, i think the problem with factory fpr, is they tend to fluctuate the pressure at higher psi levels and are not consistent in the pressure regulation = bad

Definately not.

No drop in fuel pressure is any good at all.
With turbo fuel systems, fuel pressure MUST rise proportionally to the boost increase regardless of injector sizing. 1 PSI more boost then 1 PSI more fuel pressure.
Fuel flow is proportional to fuel pressure up to the point that the injector orifice cant flow any more(max flow capacity)
Remember if fuel pressure drops then so does fuel supplied to the engine

[thirdson]

nice links..explains alot..

[b16a2]

Originally Posted by crxmad

Definately not.

No drop in fuel pressure is any good at all.
With turbo fuel systems, fuel pressure MUST rise proportionally to the boost increase regardless of injector sizing. 1 PSI more boost then 1 PSI more fuel pressure.
Fuel flow is proportional to fuel pressure up to the point that the injector orifice cant flow any more(max flow capacity)
Remember if fuel pressure drops then so does fuel supplied to the engine

no your wrong

there is nothing wrong with a drop in fuel pressure, i can run a car on 30psi fuel pressure or 60 pressure, or even a changing fuel pressure, as long as the varation is consistent it will be fine, the tune will take care of it

and yesh no shit less pressure = less fuel delivery, but that doesnt make low pressure bad, just means it has to be tuned for,

[americ_ian]

b16a2 is right... ive seen stock fuel pressure regs used on 600whp setups
YOU DONT NEED A RISING RATE FPR

infact, i would never run one...

[BUMP]

A wise man once said, the best FRP is stock.

[b16a2]

Originally Posted by BUMP

A wise man once said, the best FRP is stock.

ian???

[crxmad]

Yes you could tune for it if it was a constant low pressure say 30-35 PSI across the whole rev range provided the injector has enough fuel flow at that pressure,but if the pressure was to drop off while your engine is under full load then obviously it would start to lean out.
Basically you only have to run enough pressure to meet the pressure requirment of the injectors your using.

Id still go a rising rate reg on a turbo though but just me.

[tarmac-]

Only time id use a Rising rate is if i needed that extra squeeze from the injectors, or if for some reason the fuel atomising was bad, to increase the pressure... A pressure reg doesnt need to increase per pound of boost, if its tuned for it.

[Gudgen]

all you need for fuel delivery on a honda is an ITR fuel pump and FPR and at least 440cc injectors. honda map sensors can see, i think, 12psi before they can go skitz. you can get amazing driveability with this combination.