Ultimate and stock FPR...?

[HotRudyRod]

Hello, is it possible to run the ultimate with the stock FPR and what i assume whats a stock FP?

We are planing to run the truck with the ultimate in a mild timing and 18 to 20lbs setting with race gas, a ported exhaust turbo housing and a dump valve before he catalizer, would this be safe? Any input on issues i might not have contemplated will be apreeciated, thanks a lot before hand.

 

[The Devils Own Chariot]

Re: Ultimate and stock FPR...?

I think 42lbs is stock base fuel pressure with the vacuum pulled. I can't see pulling fuel pressure that low even on race gas. I run alky with the stock fuel pressure and stay a bit on the rich side. Datamaster will tell you what you can and cant do. I would not just say I want to run this set number of fuel pressure. I would let the truck tell you what it wants.
Yes the Ultimate will work no matter what fuel pressure you are at. Are you mostly stock with stock injectors? Stock turbo?
Running 20 psi you will definitely run out of fuel. With race gas you should be in the clear. Every truck is different so there is not really any way one person can say a certain fuel pressure will work for every truck.
If you want a path to follow. I would get an alcohol injection system. Run regular gas. Start with stock fuel pressure and tune from that point on. :2cents:

 

[HotRudyRod]

Re: Ultimate and stock FPR...?

What you are saying sounds about right, its just that the ulimate is setted up to work at 50lbs but my buddys truck doesnt have an AFPR or a 255lph pump that i know of so i was wondering if this could work, if not well i could let him borrow my AFPR but i dont want to pull any parts out of mine.
We'll defenitly have o run datamaster to see what she likes and stay in the safe side race gas or not. Thanks.

PS. the truck seems to have had some work as i've found some aftermaket parts like a flow master muffler, k&n filter, intercooler hoses, a billet mini starter, brass dist cap, etc. Other than that is all stock, turbo, FPR, injectrs, etc. Nothing major.

 

[It's just a six]

Re: Ultimate and stock FPR...?

The stock fuel pump will not keep up @ 20 PSI boost pressure.
You need the Walbro 255 HP pump & an adjustable FPR @ the very least.

 

[HotRudyRod]

Re: Ultimate and stock FPR...?

How could i find out what size a pump its got, with out actually pulling the pump out? Meassure the actual output of the pump or the non adjustable reg?

 

[HotRudyRod]

Re: Ultimate and stock FPR...?

The stock fuel pump will not keep up @ 20 PSI boost pressure.
You need the Walbro 255 HP pump & an adjustable FPR @ the very least.

Race gas included?

 

[It's just a six]

Re: Ultimate and stock FPR...?

I would definately install a wide band O2 reader,then you can see if your A/F ratios go way lean.Perhaps telling you if your pump is keeping up.
Also,,,, running 20 PSI & race gas will not necessarily put you in the clear if your pump cannot keep up w/your fuel demand.
A bit of race gas is always a good idea or @ least use an Alky setup.

 

[turbodig]

Re: Ultimate and stock FPR...?

How could i find out what size a pump its got, with out actually pulling the pump out? Meassure the actual output of the pump or the non adjustable reg?

Turn your base FP up to like 60 psi. Make a 15 PSI run, while watching fuel pressure gauge. If the pressure never drops from the 75 psi it's supposed to be at, you're good.


Adding a chip (any chip) without having the basics in place is pretty much a guaranteed dead motor.
If you can't afford the small parts, how are you gonna afford a new motor?


Get it to run well on the stock chip. It should run mid-13s solidly at < 1000 ft altitudes.
Then get the fuel pump, and the FPR, a PC scan tool, and a wideband.

 

[The Devils Own Chariot]

Re: Ultimate and stock FPR...?

There is now way of telling what fuel pump is in there without pulling the tank. If the chip is for 50# injectors and you want to run it on stock injectors I would say NO WAY!
With a 255 Walbro I was able to run stock timing and 18 psi with FP up to 58lbs safely. It was not as fast as it could be but I was able to do it. You need a custum tune or get alky. Dont try to shortcut it will cost you dearly in the end.

 

[HotRudyRod]

Re: Ultimate and stock FPR...?

Ok, this isnt my truck. It's a friend's and he is all obsessed with racing this blown/nitroused s10 that he raced before, the s10 won for about half a lenght and now he wants me to tune his just enough to give him the edge but im not so sure anymore, this truck needs more than just tunning.

 

[The Devils Own Chariot]

Re: Ultimate and stock FPR...?

:doh: Ok now Im really confused. How is an ultimate chip for a syclone going to work for a nitrous/blown s10?

 

[HotRudyRod]

Re: Ultimate and stock FPR...?

No no no, his got a 93 Typhoon. He raced against an s10 and now wants me to do some miracle because the guy upgraded to forged internals and is going to use a lot more boost and nitrous, hope that explains.

 

[The Devils Own Chariot]

Re: Ultimate and stock FPR...?

No no no, his got a 93 Typhoon. He raced against an s10 and now wants me to do some miracle because the guy upgraded to forged internals and is going to use a lot more boost and nitrous, hope that explains.

OIC!
Well if I was in your shoes this is what I would do. Cut the cat off and put in a test pipe. Cut the mufflers off and strait pipe the whole thing. Get a manual boost controller and set it for 15 psi (No Higher!). Hot wire the intercooler pump. Pull off the spare tire and the assembly if you haven’t all ready. Most importantly make sure you check everything with datamaster before you give it wide open throttle. If its still getting KR. Get the adjustable fuel pressure regulator hooked up. Turn pressure up until you are OK.

I know some people on here would disagree with me but thats what I would do to perform a miracle.

 

[cloneman315]

Re: Ultimate and stock FPR...?

Get a wbo2 before you do anything,I dont know why anyone even thinks of tweaking without one.Id rather have that over datamaster if i had to pick one

 

[NecroWolf]

Re: Ultimate and stock FPR...?

a boosted and sprayed s10 against a stock typhoon? he won last time and is turning up the boost and spray? either hope he doesn't hook or blows up :tup:

 

[The Devils Own Chariot]

Re: Ultimate and stock FPR...?

Get a wbo2 before you do anything,I dont know why anyone even thinks of tweaking without one.Id rather have that over datamaster if i had to pick one

If datamaster is not pulling KR then who cares about a WBO2. Just set your tune on the safe side just under pulling KR. A wideband O2 is a good tool though.

 

[cloneman315]

Re: Ultimate and stock FPR...?

i dont even run a knock sensor dont even feel that i need one,also since i run open loop i dont even have a o2 sensor

 

[cloneman315]

Re: Ultimate and stock FPR...?

um because if your not getting knock then its possbile you might be rich which means there is possible more power left in it and how are you going to tell on say a open loop chip without a wbo2?simple your not.

 

[The Devils Own Chariot]

Re: Ultimate and stock FPR...?

Okay okay. WBO2 is the next thing on my list. But I can tell the difference in to rich and to lean in my truck. Between EGT, Datamaster, KR, Alky settings, and feel of the pull I can tell. WBO2 is the way to go and I will have one this spring.

 

[HotRudyRod]

Re: Ultimate and stock FPR...?

Good new is i finished the truck before the dead line and the truck was running a lot better in t1 15 than it did before, bad news is i broke a rear shock mount bolt because it was so rusted. So he didnt race it, now he is going to have time to buy and install the basics: AFPR, Warlboro255, alki syst, datamaster, etc.
Thanks every one for all your help with the tune up and chip questions.