Ok, i am really confused. I thought SAE Horsepower was at the rear wheels? Our trucks are suppose to have 300 hp SAE, right? Someone clear things ups for me because it seems that everywhere i look people are taking their trucks to the dynos and only getting around ~225 RWHP.

 

The 300 hp number is at the crank, not the wheels. Oh how we all wish.

 

Does anyone make a good Single turbo (intercooled) kit for 2005 F150 5.4L ?
And if so which would be better for towing ~6,000 lbs, a turbo or S/C? I searched but couldnt find anything on a kit for a turbo...

 

I don't think there are any turbo kits out there for our trucks, anything that is bolt on that is decent anyways.

Superchargers are endless. My favorites are the Whipple, Magnacharger, and Procharger. The Roush I/C kit is also very good, I'd imagine it's gotten reliable written all over it. LOL

 

STS Turbo's makes a rear mount kit, will be in production in 30 days, according to a rep there!

 

It would have to have like 400hp at the crank for it to put 300hp at the wheels. The new harley S/C f150 (450hp) only put 337hp at the wheels on the dyno, according to Truckn' Magazine.

 

SAE numbers are corrected numbers (sea level, heat, etc) at the wheels which are not necessarily the actual numbers that were put down at the time. Standard numbers are the hp that was actually put down at the time of the dyno. Standard dyno numbers will almost always be higher than SAE corrected numbers. That's why I always use the Standard numbers from the dyno results of my Mustang
None of these numbers are at the crank, as was already mentioned. I thought our trucks dyno'd right in around the 240 rwhp mark, stock. I've also noticed some very low numbers floating around lately. At roughly 20% driveline loss with an automatic tranny, 240 rwhp seems to be pretty close when figuring it out after taking 20% off of the 300 hp at the crank.

 

there usually tends to be a 20% loss for drivetrain.300hp - 20% nets 240hp.

 

No. driveline loss is much higher for these trucks... And it's not a fixed percentage. Obviously, like a lot of stuff here, it's been beaten to desth with a rusty tire iron already lol. -->

https://www.f150online.com/forums/sh...8&postcount=23

Stock on a 5.4L 3V is anywhere from approx 190 - 210 hp, on a stingy (read- accurate lol) dyno, not 240. Some freaks of nature hit figures below or above those, but they're either rare, or have a problem (lean, stuck in closed loop, etc).

 

I'm sure tylus mentioned 240 rwhp as a good round stocker number for our trucks, and as per my post above that made perfect sense to me when he told me that, but then I don't really give a rats *** either way cuz mine is and shall remain stock

Uhh, yeah, that's a crap load of driveline loss. Never seen that much loss before, and I've seen a whack of dyno's being peformed. Well, I shouldn't say that. Stall converters can really screw around with dyno numbers which in many cases will not reflect the true performance of the said vehicle.

 

Tylus would be incorrect, or the dyno used was inaccurate. Plain & simple.

Which would you prefer> One run, by one guy, or data gleaned from thousands of runs, with thousands of different trucks, on the same dyno?

It's absurdly high - a plain fact. And one reason Titan & Tundra drivetrains have an edge. Not to say they're more reliable, though lol.

We are talkin' the stock converters, here. And peak numbers, locked in 3rd gear, converter locked.

 

Absolutely. It's a good ballpark figure though; at least for most vehicles. I use 15% for manual tranny's.

 

Ok. concur on the sticks.

BTW - ever do any Speed-Density --> Mass Air conversions?

 

I don't believe any runs, by any guys, especially on the net..LOL In Tylus' defense though; he seems like a pretty straight up dude.

I noticed Troyer talking about 310 rwhp for a stock Lightning dyno pull in the link you posted. Well I can personally attest to seeing 350 rwhp on a stock Lightning, and this was on an accurate dyno. Cobra's (03-04), I've seen all over the map from 350- almost 400, and that's stock.
Unfortunately, I never saw any F150's on the rollers. I used to pop by my friends performance shop to watch the different car and truck clubs come through on dyno days. Haven't been back in a while.

 

Including cam swaps I know a few that have done quite well going to SD, esspecially with a SC, but no, I haven't personally done any myself.
I kept the MAF intact in my car, although that has all been changed to aftermarket.