Asking for a friend who is not on the board. He is running a PFC, stock primaries, and 1300's for secondaries, w/a supra fuel pump.

Question is does he need to do more to the fueling system and EMS system before moving up to a GT3540? If so what is reccomended?

 

That should be enough fuel to support 420hp.

 

more like 450hp.

 

Well, not to insult anyone else, but be VERY careful have your buddy look up the calculations themselves.

Check out Max Coopers site and do the calculations based on what boost you're going to run along with the specifics of BSFC of the engine and what fuel pressure you're going to run.

If you run STOCK fuel pressure (with at least an upgraded pump!) on a stock block at not more than 85% duty cycle, you'll only support 381 RWHP.

I ran 100% duty cycle for awhile and toasted my injectors, burnt the O-rings too.

Here is the MOST important reason you need to plan to run 80% or below:

AMBIENT AIR TEMPERATURE!

What most people are ignore is that the PFC will factor the basemap and correction factor based on certain temperature ranges.

I hit 90% duty cycle on my car (see mods below) in ~20C weather where I was tuned to hold a very rich 11.0 AFR running 14psi. This is with 850/1300s! I doubt I am putting out over 400RWHP.

Do your buddy a favor and filter out the noise from the signal and tell him to do the math. Running anything less than 550/1600 for around 15psi boost is trouble waiting to happen when the temperature drops.

 

running 850 / 1300 is the same as 550 / 1600 though.....are at least they both add up to 4300cc's

Just throwing in another alternative.

STEPHEN

 

My Bad. How about "don't run less than 4000+ cc's"

 

Tell your friend to run two Nipendenso (Supra) pumps inline and get the 1600cc secondaries and he won't have any problems at all unless he wants to run more than 24psi. The one Nipendenso is supposed to be good for 500hp. My friend runs two of his pumps inline in his Supra and he puts down 733rwhp, so I know its good for you.

 

Ernie,

You running both pumps in tank? Using a surge tank or anything?

 

what fuel setup do i need to run a t78? i have the secondary with the 1600's but am unsure what size pump i need to run. do i need to upgrade my primaries? i have the RP pump but dont know if it will be big enough. thanks.---j

 

I Have seen a T-78 running 400 rwhp on STOCK injectors with a PFS purple. I have tuned RX-7's around here that dynoed 370 rwhp and run 15 psi on STOCK injectors with the purple. Peter Farrell runs 430 rwhp on pump gas and 490 RWHP on C16 with 550/1200..with an electromotive...You should be ok to 430-440 rwhp...

 

Thanks a lot for all the responses.

 

But is that at stock fuel pressure??? I doubt it unless Peter's dyno roller has some holes drilled in it lol

STEPHEN

 

As of now, Im still running one pump, but I plan to run two SR Ultimate pumps next spring.

 

What duty cycles? And as asked above what fuel pressure?

 

Nice. I bet that engine and computer are still running, right? And have survived some below 68F temperatures at boost?

Anyways, sometimes it better to be lucky than good.

 

On the car running 400 rwhp with stock injectors he wanted more power so he sold the purple and upgraded injectors..( limited tuning) As far as duty cycle at 400 rwhp I am sure it was 100%. (This I wouldn't recommend either but I have never seen one fail). As far as the 370 rwhp still going and they run supra tt fuel pumps...(5 cars around here). I would agree it is FAR better to be safe than sorry..

 

Ernie,

I have a dual feed pump in development. It's a bracket and fitting kit to turn your single pump into dual in tank pickups. Can ALMOST be used with any pump. Currently prototyping with the Walbro 341 and the Nippon Denso (I don't have 1 or 2 SR's to work with right now).

PM me if you want to know more.