Right now I'm in the middle of rebuilding my 87 T2. While my car is all torn apart I'm doing some mods as well, but I need a little conformation on my fuel setup.



First here's the mods I'm doing:

streetport

Stage 3 turbo upgrade (t04 with 60-1 compresser wheel)

catback

cone intake



Here's my fuel setup:

S-AFC

FCD

Walbro Pump

and 4 720 injectors



Does this sound like plenty enough fuel for my mods? Am I forgetting anything?



Thanks, Ed

bump

I can get bosch injectors for $95 each or nippon denso for $110 each.

Which should I go for?



Thanks, Ed

thats plenty of fuel, i ran the same setup with the stock injectors and i could make the car stumble it was so rich. where are you find the nd injectors? i would go with those (stock) over the bosch



mike

You should also add a fuel pressure regulator. But thats if you go the cash for an lines an rails.

you can also plug the stock regulator into the manifold, it becomes rising rate when you do that



mike

it does? cool. Where is it normally plugged into?

it does? cool. Where is it normally plugged into?[/quote]

its plugged into a solenoid. When you plug it directly into the manifold it increases the static pressure and it becomes a rising rate regulator.

so that means it rises 1 psi per each pound of boost, right? is that how those work? it seems those would be hard to control, i don;t really understand the point of rrfpr.

yup, it does 1:1. think of it this way. the injector is pressureized at the fuel rail, say 43psi, and when there is 15psi vacuum (idling) on the other side, it flows x amount of fuel. what happens when the fuel rail pressure is 43psi and your boost is 15psi, the idfference between the 2 is less, so its gonna flow less fuel through the injector. the rising rate regulator is supposed to keep the raitio the same, ie at 10psi it raises the fuel pressure 10psi to compensate



mike

"thats plenty of fuel, i ran the same setup with the stock injectors and i could make the car stumble it was so rich."



I don't understand, you were running what setup (a to4, intake, exhaust and streetport) and you were running rich with 550cc injectors?



Everyone told me I would lean out if I didn't go with 720's all around



Also I don't want to mess with fuel rails, pressure regulator or anything else like that, thats why I'm going 720s.

I think I should be safe with the 255lph pump, s-afc, and injectors.



ed

yeah u should be safe.

i was running stock injectors with an fd pump, hybrid stock turbo, full exhaust, intake @11-13psi and it was so rich it would stumble (i had an fcon) when the fcon was turned up



mike

j9fc3s, oh ok now I understand.



1Revvin7, I see you are running a hybrid to4 also.

What's your fuel setup like?

Do you have any other mods?



ed

I had a small hybrid (TO4B H3 wheel in a machined stock comp housing), stock engine, 550s/720s, stock ic, full exhuast, walboro, and the fpr plugged into the intake, and it was piss rich over 3800. Luckily my turbo didnt really come alive until about 4000, so i wasn't stressing the primaries so much. I think thats how I got away with no fuel controller. I hear lots of people blow theirs before the secondaries come on.



Anyway, your setup sounds fine.

So I should go with the 720's in the primary like I said.

With the s-afc I should be able to tune them in so they don't run too rich right?



ed

Yeah you are on the right track.



In all my rambling I forgot to mention I was running 14 psi.

walbro, aeromotive fpr. 6an lines, tapped fuel rails, 1600cc secondaries,

sometime you just get lucky with fuel setups. I ran 1600cc's with the stock ecu and dynoed at 265rwhp with a 12.1 ARF across the board. 720's with a super AFC is good setup.

's

how did u manage that? with a piggyback?

the car runs lean when you put low impedance injectors, on a high impedance car, so the 1600cc injectors dont act like 1600's



mike

ah, so thats only with a stock ecu though right? 1600cc on a standalone wouldn't matter if they are high or low impedance, right? since u wouldn't keep that resistor pack, correct?

Woohoo I got my S-AFC today. Now all I need to do is put my motor back together:)

I'll be needed some help pretty soon with tuning my s-afc.

Should I get a a/f gauge to setup my s-afc, how will I know if I'm running lean or not?



ed

I also wonder that too, and HOW accurate is it.

Ive seen an hks one that reads out the actual ratio, but it was expensive around 300

Then I saw a cheap autometer one for like 60, but it just reads from lean to normal to rich

I'm thniking about getting the autometer one, 300 is too expensive for me.

Doe anyone have this gauge and is it acurate?



ed