Advancement of fuel delivery? - Page 6

Chevota · #**176** (**permalink**) July 9th, 2008, 09:59 PM

gonna MAKE it fit Don?

DonWG · #**177** (**permalink**) July 9th, 2008, 10:49 PM

Holy Freaking Crop Duster!!!

(jaw laying on the floor between my bare feet)

I think I'll be making it fit, Ummm.... HALFWAY THROUGH THE RADIATOR!!! OOOMMMGGG!!!

Chevota · #**178** (**permalink**) July 9th, 2008, 11:39 PM

that's actually a pic of a FI-X 98mm, but i bet yours uses the same housing

DonWG · #**179** (**permalink**) July 10th, 2008, 12:35 AM

I think you're right.

Those wouldn't happen to be those new half cans of soda?

Hot Air · #**180** (**permalink**) July 10th, 2008, 07:30 AM

Now that's a real TURBO!
Conrad C.

Tim (the Tool Man) Taylor would be impressed.

DonWG · #**181** (**permalink**) July 12th, 2008, 09:19 AM

I figured out a wiring configuration that will hopefully eliminate any chance of the delay box causing any problem after transbrake release. In the past, the box was mysteriously, and intermittently restarting during the run, causing the transbrake solenoid to come on when I really, really didn't want it to.

The new wiring circuit only powers up the delay box when I press on the transbrake button. On the release of the transbrake button, and after the delays have timed out, the box powers down on the release of the transbrake solenoid. The box remains dead until the next time the transbrake button is pressed. Now. Unless there's some freaking electrical gremlin in that box, that should totally eliminate any worries of that box messing with my run. Saying of the day. I got this one off the toilet paper. A less stressed driver is a good driver.

By the way, the new turbo didn't show up this week. Drats.

Chevota · #**182** (**permalink**) July 12th, 2008, 12:50 PM

UPS prob had to purchase another semi make that delivery

DonWG · #**183** (**permalink**) July 13th, 2008, 02:28 PM

I installed the new fuel pump that I'll need to extend my boost range and the difference was quite a surprise. It's apparent now that the old fuel pump was having a very hard time keeping up with demand from the very start of boost rise. The fuel map had to be adjusted to keep the engine from flooding out at the onset of boost.

The fuel pressure is now referencing with boost pressure as it should be. The fuel pump voltage booster was turned down from 35% to 0%, and so far 20% of electronic injector pw has been pulled out across the board. Testing ended with the a/f still very rich (lower than .69 lambda*) throughout much of the midrange. The engine is now making a clean run, but the ET is down around 2 tenths. MPH is very close for the 24 psi I was testing with. I suspect I'm losing most of the time at the launch when the engine is passing through the over rich midrange.

The transition period where the auxiliary fuel is turning on still shows a lean spike, but the time for the mixture to come back around to normal (but still too rich) is shorter. The higher fuel rail pressure has changed the contour of the aux fuel turn on transition. Still working on the shape of the contour. The tail end of the contour also includes the transition of the nitrous turn off point.

The rate of map rise is amazingly quick. That was a very obvious dicovery in the datatlogs. Don't know why that would be different. For the first time since engine version 2.0, the boost is actually spiking past the controller set level. The spike is about 5 psi. More testing will bring that reason to light.

* The richest reading that my system will read out is .69 lambda.

GNBRETT · #**184** (**permalink**) July 15th, 2008, 12:35 PM

That thing is Ginormous!

DonWG · #**185** (**permalink**) July 17th, 2008, 10:45 AM

The larger fuel pump I installed has the capacity to reference the fuel pressure to boost (1 to 1), unlike the old pump. This presents a problem with my nitrous system. The nitrous system was jetted on the rich side for a fuel pressure of 45 psi. Now that the fuel pressure is rising with boost, the nitrous system will be richening with boost. I'll study the datalogs to see if I can get away with this. If not, I'll have to install a separate fuel pressure regulator for the nitrous system. Luckily, methanol has such a wide a/f ratio burn range, I may get away with having it richen before shut down at 16 psi. It would certainly be a safe way to run it. Preliminary runs show that it will run clean. I just need to figure out if it's slowing my 60 foot being so rich.

DonWG · #**186** (**permalink**) July 17th, 2008, 03:17 PM

Quote:

Originally Posted by DonWG

The larger fuel pump I installed has the capacity to reference the fuel pressure to boost (1 to 1), unlike the old pump. This presents a problem with my nitrous system. The nitrous system was jetted on the rich side for a fuel pressure of 45 psi. Now that the fuel pressure is rising with boost, the nitrous system will be richening with boost. I'll study the datalogs to see if I can get away with this. If not, I'll have to install a separate fuel pressure regulator for the nitrous system. Luckily, methanol has such a wide a/f ratio burn range, I may get away with having it richen before shut down at 16 psi. It would certainly be a safe way to run it. Preliminary runs show that it will run clean. I just need to figure out if it's slowing my 60 foot being so rich.

Ignore this last post. The fuel pressure referencing with boost pressure is a good thing isn't it. Delta across the nozzles. Doh!!!

Chevota · #**187** (**permalink**) July 18th, 2008, 01:43 AM

Which pump did you end up using?

DonWG · #**188** (**permalink**) July 18th, 2008, 03:50 AM

Quote:

Originally Posted by Chevota

Which pump did you end up using?

Weldon 2345-A.

Reggie West · #**189** (**permalink**) July 18th, 2008, 10:26 AM

You may need a 150 shot on the line to spool that monster.

DonWG · #**190** (**permalink**) July 19th, 2008, 12:58 AM

Quote:

Originally Posted by Reggie West

You may need a 150 shot on the line to spool that monster.

I've been using a 190 shot since the beginning. It should be interesting to see how it spools this turbo. I'm kinda hoping that the nitrous stays on a little longer than it has in the past with the T76. What I mean is the turbo not spooling to 16 psi too quick. It might be nice to have the 190 shot of nitrous pull me out of the hole for longer than just .4 seconds.

I've finished re-mapping the VE table to the new fuel pump, off nitrous. There's an event at Barona Sunday. I may take the car up to check the engine tune on the nitrous. If all goes well, it'll be time to do the big upgrade. I have tons of extra fuel capacity now.

I've got some pictures I'll start posting tomorrow.

DonWG · #**191** (**permalink**) July 19th, 2008, 01:03 PM

I now realize why I melted some spark plug electrodes when I tried to spray the nitrous for the whole run. With the fuel pressure not referencing with boost, and my nitrous system fuel side tied to the main fuel system, the nitrous was leaning as boost increased. Guess I should have concentrated sooner on what the fuel pressure was doing.

Another thing learned was that nitrous can tolerate a progressively leaning situation as long as the duration is short. Very short.

lazaris · #**192** (**permalink**) July 19th, 2008, 08:19 PM

Man thats allot of nitrous to spool a 76 or a 91 for that matter. Did you need all of that 190 for the 76?

Quote:

Originally Posted by DonWG

I've been using a 190 shot since the beginning. It should be interesting to see how it spools this turbo. I'm kinda hoping that the nitrous stays on a little longer than it has in the past with the T76. What I mean is the turbo not spooling to 16 psi too quick. It might be nice to have the 190 shot of nitrous pull me out of the hole for longer than just .4 seconds.

I've finished re-mapping the VE table to the new fuel pump, off nitrous. There's an event at Barona Sunday. I may take the car up to check the engine tune on the nitrous. If all goes well, it'll be time to do the big upgrade. I have tons of extra fuel capacity now.

I've got some pictures I'll start posting tomorrow.