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Explorer Maintenance - Modifications - Performance Upgrades - Problem Solving - Off-Road - Street Explorer Forum Covers the Explorer, ST, Sport, Sport Trac, Lincoln Aviator, Mercury Mountaineer, Mazda Navajo, Ford Ranger, Mazda Pickups, and the Ford Aerostar
Did you do any upgrades to the trans...other than Doug's reprogramming? That's the only thing I'd kinda be worried about since mine can't even handle the stock 4.0L.
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:frustrate Yesterday was a nightmare on the dyno. Doug and I couldn't get the a\f right regardless of how much Doug tried to manipulate the programming. The dyno operator was suspicious of me running out of injector but once he learned I had 30#ers we threw that idea out of the window. So with the truck sitting on the dyno we hurried to a local parts store and bought a fuel pressure guage. Did a few preliminaries and found at around 3500rpm the fuel pressure started going to pot. No damn wonder Doug couldn't get the a\f correct electronically. I had a new pump in it,but it is a Focus SVT unit. After talking to Doug he mentioned this is the third one he's seen fail. 3 OUT OF 3! So to all of you thinking of using a Focus SVT fuel pump CONSIDER YOURSELVES WARNED, THEY ARE DESIGNED TO BE IN A PWM SYSTEM NO A CONTINUOUS SYSTEM. Either the pump is already worn from running continuously or it was faulty to begin with (which I doubt). Oh well here I come Walbro. I guess sometimes you gotta pay to play. As far as numbers.......Doug and I have agreed to keep that little bit till the next time we dyno. But we are sure it'll will be impressive. It was just starting to show decent numbers but Doug was limited in what he could do because of the poor fuel pressure. Once again and as always thankyou Doug for everything!-James
Ouch! that sucks dude sorry to hear about the fuel pump but again you have a very nice looking truck and setup and wish you all the best and love the dedication you have with your truck.
Yes, we were at Walker's. I'm not shy to say the numbers, 253 rwhp and 271 rwtq, but I will also say that they are low because we couldn't add any timing to the mix. One run would be great at 11.5 until 4800 and then drift lean and then the next would be at 13.5 and drift horribly lean at the end.
I'm in Orlando right now at SCT's advanced training class so I'm out of pocket for the next few days but I have one of the half decent runs on paper that i"ll post just to give everyone a small taste. I think once we get the a/f right and can add some timing to the mix it will really come alive. It wasn't pinging at all at 13:1 a/f so that means the timing can really be raised.
So how much boost is it actually getting? What RPM is max boost available? I know it isn't optimized yet, I'm just wondering how quickly it spools up so far.
This boost was only at 5.5 to 6.0 #'s so it is very conservative, as well as no methanol inj whatsoever. The boost can come on as soon as 3000 rpm just depends where your foot is in the throttle because that controls what the wastegate does
When my truck was stock, 0-15 was where it was worst. It didn't pick up until 3000 rpm or so, but it went pretty well from there to 6k. It gets off the line much better now though.
Well I haven't yet driven a SOHC 4.0, I was referring to the V8, and I figured the V6 would be close. That does match what others have said about the V6/V8 differences.
Regards,
MAN I COULD HAVE TOLD YOU THAT! lol. In a return fuel system I would have went with a Walbro GSS342 immediately. Returnless, I would go for either Aviator, SVT Focus, or Cobra pumps. Oh well, lesson learned. At least now you will be getting the fuel pressure you need to see.
I gotta question for Doug. I see on the 4.0, the turbo replaces the muffler and I see how this works. But on the 5.0, could you have just one pipe to spool up the turbo and the other as a single exhaust? Don't get me wrong, I love the sound of a whining turbo, but I like the sound of the exhaust too.
Ok I gotta a question about the exhaust that you have used. Does or did you vehicle have the duel cats.. if so, would the exhaust that you bought (MAC) would it bolt up without problems... if you didn't go with the turbo?? I am still learning about my 98 so please excuse the ignorance
BTW those in the engine bay turbo's were twins, not running only one single on one side and nothing on the other. They were also most likely small twins in the 50-57 mm size, not a T76 or anything bigger like that. If you ever see a single turbo under the hood of an engine with more than one head then there is a crossover pipe that connects between the other side manifold or header to the side with the turbo on it and they Y in together then hit the wastegate if it isnt integral with the turbo and then into the tubo to spin the turbine blades and then out through the single exhaust and into whatever configuration exhaust the person wants to go to from there.
I've seen quite a few STS turbo systems. They're out here in Utah. I like the idea on our trucks for street. But as for wheelin I know I'd damage it some how. I'd hate to hear the sound of a turbo socking a rock.
We ran into some more tuning issues, mainly doing the MAF in a blow through application was dealing us fits.
Finally he came over yesterday and we rearranged the MAF system and it is now a draw through application, the MAF is in the rear of the truck underneath the bumper and there is a large heat sheild around the MAF so no heat from the exhaust is near it. This also reflects in the IAT temps as they are 10 degree's cooler then when we had the MAF up front and the airfilter right off the end of the Turbo.
Either way we used a LM-1 wideband to monitor and record his a/f readings along with the datalogging X-2 tuner and we finally got this right. His a/f ratio is now 11.0-11.5 across the board and well into the 6000 rpm range where as before around 5200 rpm's the a/f would instantly goto 13:1 and higher.
The Explorer runs great on the 6psi setting and where as we wanted to try the 10psi setting my laptop battery and our time frame in a whole just wouldn't allow it. We'll be headed back to the dyno now that we have it where we want it for the 6psi setting to get some new numbers and then complete the tuning for the 10psi setting.
I'll keep you all posted...
Thanks, Doug.
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