Have had my y pipe on now for about a week, 04 f350 cc sb 4x4 3.73 gears with hypertech tuner, k&n fipk and fm70 muffler. Did one on my brother in laws bone stock 01 f350 cc, lb 4x4 3.73 gears at the same time. We both notice better throttle response, less throttle needed to maintain speeds and to get the truck moving, no dyno runs though but seat of the pants feels good. Deffinetly worth the 90 bucks spent. Neither one of us have towed anything since the install. The pipe removed from the truck is a joke the way it is choked down, couldn't be good for power or mpg.
To touch base on the choppy data numbers on the dyno, I spent about 4 hrs at a NED in Mass and they found it to be in the loop on how the motor is reading air/fuel. They guy that did my tune was a master programmer and wrote Ford code. He fixed it and I am looking for my dyno sheets to scan. It was communication between the MAF and what the O2 sensors were reading. I had a back fire and a lean condition at the higher end of the RPM range. Choopoy like what you saw. Now, all good, the tune I have is a custom tune, wiped out a chip and reprogrammed it. I think when it was all said and done, I picked up almost 50 hp and much more torque. Let me find my sheets so ya'll don't call me a fibber...
The eBay guy claims 33HP(!) with just the Y-pipe. He's obviously full of shee-it. Why anyone would want to continue to support his business now is beyond me.
Actually, 33HP at the flywheel is believable, if you're using "corrected" rear-wheel dyno results. Of course, we all know how accurate rear-wheel dynos are. Great for comparisons between mods on the SAME VEHICLE like fordmdb is doing, but overall not a completely accurate portrayal of what's happening at the flywheel. (Rear-wheel-dynos show more HP when you remove rotating weight like lighten the driveshaft or rear wheels/tires or remove the mechanical fan and replace it with an electrical fan. In reality, you haven't done anything to the actual amount of torque at the flywheel available at any one RPM. HP=Torque*RPM/5252. HP at the flywheel has nothing to do with engine acceleration).
I suspect what the restricted Y-pipe does is limit the acceleration of the crankshaft. Which is not really "flywheel HP".
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- art k. - Moderator for the Superduty, V10, and FE forums
'01 F250SD SC SB XLT V10 4x4 auto 3.73 Warn hubs Volant CAI, eBay headers and y-pipe - 5-star custom tunes on SCT X3
'97 Cougar XR7 30th Anniv Edition 4.6L
'74 F250 Highboy FE390 deceased! I've been wrong before, I'll be wrong again. Just wait and see.
They don't claim flywheel HP & TRQ gains. SPDs site says
Quote:
Originally Posted by SPD
After the installation of our Y Pipe, our customers are achieving 30 to 40 hp more (and 30 to 50 pounds more of torque). Made from mandrel bent piping, it creates a smoother, unrestricted meeting point of both header exhausts. Additionally, our customers have seen an increase of gas efficiency, averaging 2 mpg better. Here is what the Dyno Tests show on an F250 crew cab.
HP increase: 33 hp
Torque increase: 35 Ft. Lbs.
(The vehicle tested was considered "stock", not having any other modifications, alteration, or aftermarket products.)
Doubt they pulled the engine to test it.
I'm not even seeing a 33HP with a custom tune.
While its a great mod, I think the performance gain claims are crap, that's all.
While its a great mod, I think the performance gain claims are crap, that's all.
Of course they are. And I can safely bet that they are "adjusted flywheel" numbers. Did you get your tuned X dynoed?
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- art k. - Moderator for the Superduty, V10, and FE forums
'01 F250SD SC SB XLT V10 4x4 auto 3.73 Warn hubs Volant CAI, eBay headers and y-pipe - 5-star custom tunes on SCT X3
'97 Cougar XR7 30th Anniv Edition 4.6L
'74 F250 Highboy FE390 deceased! I've been wrong before, I'll be wrong again. Just wait and see.
^^^^ The Y-pipe from flowmaster may cost around $40 but to have an exhaust shop bend up the pipes and install everything its going to cost a bit more than $100 at most places. Then in most cases you end up with collapsed bends like in the picture that hurts flow. The stock Y pipe is mandrel bent and just replacing the restricted section works well and is easily doable with no bending.
I can believe the 33hp 35tq claims for the 01-04 pipe isn't impossible especially if they calculate flywheel numbers. Remember where the claims come from however. They advertise the best gain at any one point on the entire hp and torque curve not at the peaks. For example the 30 hp gain could be at 1200rpm and the 35tq gain could be at 5000rpm. Not at the peak of either curve but at one given point. Thats how Banks gets there claimed numbers. Its marketing.
Not at the peak of either curve but at one given point.
Yes, that's absolutely right... I was amazed that Superchips, for my 4.6L '96 t-bird, only advertised like a 12ft/lbs PEAK increase in torque.
The fun was the 32ft/lbs increase at lower and higher RPMs that was obvious on their dyno chart. Calculated "flywheel" numbers, but the increase was very noticeable at other parts of the curve.
Maybe their marketing people didn't know what they were doing
Anyway, back the dyno thread - this stuff is way
__________________
- art k. - Moderator for the Superduty, V10, and FE forums
'01 F250SD SC SB XLT V10 4x4 auto 3.73 Warn hubs Volant CAI, eBay headers and y-pipe - 5-star custom tunes on SCT X3
'97 Cougar XR7 30th Anniv Edition 4.6L
'74 F250 Highboy FE390 deceased! I've been wrong before, I'll be wrong again. Just wait and see.
^^^^ The Y-pipe from flowmaster may cost around $40 but to have an exhaust shop bend up the pipes and install everything its going to cost a bit more than $100 at most places. Then in most cases you end up with collapsed bends like in the picture that hurts flow. The stock Y pipe is mandrel bent and just replacing the restricted section works well and is easily doable with no bending.
I can believe the 33hp 35tq claims for the 01-04 pipe isn't impossible especially if they calculate flywheel numbers. Remember where the claims come from however. They advertise the best gain at any one point on the entire hp and torque curve not at the peaks. For example the 30 hp gain could be at 1200rpm and the 35tq gain could be at 5000rpm. Not at the peak of either curve but at one given point. Thats how Banks gets there claimed numbers. Its marketing.
When I bought my ebay pipe, the 99/00 did not have the same claims as the 01-04 pipe, & thats what this dyno run was all about, the 99/00 yrs without the choked down pipe that was supposed to remove flutter. I just checked the ebay site & did not even see the 99 pipe any more. Any how, I was impressed with these results, tuned & not tuned , it confirmed what I had felt in the drivers seat. It's all good !
When I bought my ebay pipe, the 99/00 did not have the same claims as the 01-04 pipe, & thats what this dyno run was all about, the 99/00 yrs without the choked down pipe that was supposed to remove flutter. I just checked the ebay site & did not even see the 99 pipe any more. Any how, I was impressed with these results, tuned & not tuned , it confirmed what I had felt in the drivers seat. It's all good !
oops, I now see the claim for 99-00 pipe...sorry Monsta !!
Hey Mike. I forgot to ask you when I called earlier... I was thinking about getting a new valve body. How well would a good tune be compared to a valve body or would both be a great thing to do?
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-Brice-
1999 V10 F250 SD XLT 4X4 4.30LS
18X9 XD Badlands, 285/65 Dune Grapplers, Doug Thorley Headers,
K&N, Chrome Grille, New headlights & corners, Bilsteins,
Clear Cab Lights, White Lightning bar, LED dome lights, SCT LiveWire
LED 3rd brake light, FM 40, SuperWinch hubs, LED Tails
Forget the valve body unless your willing to get the truck on a dyno for custom tuning or have the software and knowhow to tweak it yourself. Been there with the VB and its a PITA to get it dialed in right or at least to my liking. Thats why I pulled it off. Anyone who is interested in a FT VB PM me. You can however leave the trans stock and still run the accumulator upgrade but the converter still locks slow then. You would have to get a lockup valve kit to get the TQ to lock quicker.
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