yusoslo

I am running a stock S4 T2 motor with haltech E6K. I will be running 12lbs of boost for now.

I believe I need to get rid of the 550 secondaries for some 1600's (I will be going big turbo next year)

Will a Walboro 255lph pump be fine......I will be shooting for 375whp on 93 octane when going big turbo as well.

Also for my stock turbo setup, should I go one heat range colder on the plugs? and should I do that for both leading and trailing, or just trailing?


My biggest concern is the car is running great with great compression. We are getting ready to drive it and tune the haltech. I dont want this thing to lean out so I am def changing the fuel pump. But do I need 1600's at 12lbs ?

J-Rat

iTrader: (2)

You wont need 1600s for 12 PSI on a stock turbo, but bigger injectors is a good idea. The Walbro will be plenty for 375. And you can run BUR9EQs all the way around, and you will be fine.

Rat

yusoslo

thats jrat.

but the walboro pump with stock 550's all around wont support 12psi??

I might just get 720s for now and when I do my turbo swap put those in as primaries and have the 1600's for secondaries

RETed

That combo is only good for 240hp at the wheels (DynoJet) until the pulsewidth gets too dangerously high.


-Ted

yusoslo

thanks for the information guys.

I will buy some larger injectors tomorrow.

I was looking into a timing split.

how does like 2-4 split in vaccum and work my way up to 12 split at 12lbs of boost. I want to have a safe tune as far as fuel enrichment but I dont want my timing too retarded. BTW this is also assuming I do not advance the timing. I dont know if I should. This is my first rotary tune.

Tournapart

iTrader: (4)

go with some 720's and 1000's, unless your going with a huge turbo and you want to run dual fuel pumps, 1600's are unecessary, unless you like flooding

yusoslo

isnt that a little overkill for a stock turbo?

I think you are talking about a 720/1000 setup for my 60-1 turbo when I upgrade.

and a intake and a inline fuel pump. or two in tank pumps?

J-Rat

iTrader: (2)

Okay, let me give some info here:

Split is a matter of MUCH debate. Some run lots of split, some dont. Myself and some of the others around here in Tucson consider *safe* to be around 12, with 8 being the max limit I would go in boost. Thing is though, you really cant see what is working for your motor unless you can get some dyno time to see results. Also, advancing is somewhat of an art, because what you want is to get a baseline curve, then run your numbers according to what you are seeing, with the timing going more advanced AFTER the torque peak.

As far as injectors are concerned, I made 347.5 on 720 primaries, and 890 secondaries with some alcohol on top. The 720/1000 combo is a good suggestion, although you dont need anything other then a Walbro 255 in tank for that power level (assuming you have an aftermarket FPR). The Walbro can flow a signifigant amount of fuel, and has actually been proven to outflow the Supra pump in most cases.

As usual, keeping tabs on your AFRs and fuel pressure while tuning is a must.

Hope that helps.

*edit* and that Haltech should be fairly competent at controlling those 1600s in the secondary positions. Rumor around the campfire is that its hit or miss for idling 1600s in the primary positions. I never tried it, so I cant really say for sure.

yusoslo

yeah I would like to stick with the 720/1600 setup when I upgrade the turbo.
I also figured the Walboro would be enough.

So you are saying as soon as I transition into positive boost on my maps, I should not have anything closer than 8 degrees of splitand then taper to 12?

J-Rat

iTrader: (2)

No, mine runs a flat 12 deg split. All the way out.

yusoslo

even in vaccum?

btw you have been a big help.

J-Rat

iTrader: (2)

No, my split is different in vacuum. I pretty much copy the Hitman map up till vacuum. Then I run a straight 12 all the way out.

Tournapart

iTrader: (4)

yeah i meant for your larger turbo, and yeah i mean one intank and one inline, but dont mind me, i was tired when i posted that and didnt read your post correctly, i think, lol. anyways, i think that the 720/1000 setup would be a great choice considering, but i mean, its not my car, and theres alot of other ppl out there that know more than i do,

good luck