How much are you going to have to mill the heads to get 11.1 cr? Seems like that wouldn't add up using stock pistons.

 

I thought the parasitic loss was more than 15%...More around 20%. Stock 5.3's that come factory with 285HP at the crank dyno around 225+ @ the wheels from what I've seen, but then again all dynos read different.

I think it might be possible. He is running 11:1.

Starting from 285 rwhp
+40 from cam = 325 rwhp
+25 from heads = 350 rwhp
+15? from pulley/fan = 365 rwhp
+15? from FAST = 380 rwhp
+5? from cutout = 385 rwhp

Get some Long tubes and its possible IMO. I said 40 for the cam because I gained 30~ rwhp from this low lift comp 212 218. Thats judging by the .3 gain and +3 mph in the 1/4 untuned. I dynod 260rwhp on the 212 218, basically stock 5.3

 

Yes, I am not doubting for a second that headers, intakes, mufflers, efans, pulleys, ect don't ADD power, but allow the engine to be more efficient. Even a tune is that same way. It doesn't add power, it just controls parameters that allow the engine to function as efficiently as possible.

I don't doubt your math at all. There are plenty of guys making 350+ rwhp/rwtq with very similar setups as the one he wants to run. 400 to the wheels may have only been done once or twice, but it is still obtainable.

I will say that 15% drivetrain loss is pretty typical on a dynojet. Mustang dynos can show as much as 20% parasitic drivetrain loss. I believe it is because mustang dynos take into account true loads set on the vehicle.

 

Plenty of guys are bolt on/cam only and putting down 330-350 tp the wheels all the time.
Just do a little search.
Add a few things like a better intake,tb and the heads and you should be 370+ run it on a hot tune with some race fuel and you might see 400.
Oh and as normal i disagree with almost everything InchUp has to say.

 

Rethinking everything I think it's going to take more cam I read Pat G's build a while ago when he did a write up of a 500rwhp N/A LS1 build. Basically since the Fast dies @ 275 cfm/.600" lift, he had AFR work some 205 heads to flow great @ low and mid lifts, and ran a XE-R lobed cam to get the lift faster and obtain more air in the low and mid lifts. Also ran 11.92:1 compression, with some Kooks 1 7/8 stepped to 2" headers with 3" duals.

 

Ya except that you just agreed with me word for word. Way to go!

Your response on top of mine is the same 370hp mark until he advances the timing and adds race fuel:
And again for the 3rd time 400 flywheel horsepower is still 60hp short of 400 rear wheel horsepower. I don't care who disagrees with me at this point. The final results of a dyno will say it all.

 

I don't get why you would only get the 78mm intake. Will your 80mm TB bolt to and seal against a 90mm intake? If so, then go with that route so when you do upgrade the TB later it will work better.

 

with the setup he is talking about maybe 340-360 at the wheel....Mean03 put down 390 at the wheel on a motor pass with a N/A tune...with a LQ9/big cam/and worked heads...just look at his sig

 

Wow, I really didn't mean to stir up this much ****, but I guess now it's not only a goal but a point to prove that it can be done. It may not be cheap, but it can be done. The 220 may not be enough cam, but I'm going to start with that. I'm a true believer of the perfect combination can build excellent power, after tons of research and bugging some sponsors I think this combo is a good starting point. I think if I can continue to build power to 6500 rpm it will buy some more ponies.
How many 5.3's have we seen @ 11:1 with similar parts [B]making[B]power to 6500? most guys don't bother spending that much on a 5.3. Like I said, I as well as plenty others on here would like to see how much can be squeezed out of the 5.3. Whether I end up with 400rwhp or not it'll be snappy and fun.

 

a little different set-up but one of my good friends has a ws6 he has the smallest cam and cheapest set of heads, and runs the best time out of all the guys I know (locally) that have cammed f-body's. It's all about what works well together in a particular motor. Just because you have the largest cam, and the best set of heads doesnt mean your making the most power!