This is exactly it, so many skewed numbers, hard to tell what we are really looking at. From doing pulls in different gears to having over 50hp difference in stock dyno numbers between everyone. How do we even know if our 360 is putting out healthy numbers? From your 368HP SAE crank dyno numbers above, thats between 294-313 whp factoring a 15%-20% drive train loss.
Not all dyno's are the same of course. My experience over the last 24 years is on the same Dynojet. If I had a 360 on a Dynojet making significantly less than 320rwhp I would figure out why. Starting with is the air/fuel ratio correct and is it making peak torque and hp at the correct corresponding RPM. Just my opinion.
This is why I started this thread, because how do we know if there is a "why" when it doesn't have 320 whp hitting the dyno lol. What is the actual baseline that we need to be worried that something is actually wrong when compression is good, runs good, feels good but puts out 285-310 whp on the dyno? Is there actually something wrong or is that a healthy normal number for this engine when dyno'd crank hp straight from Ferrari was 360-368? All skewed, makes it hard to try and figure out whats wrong when nothing is actually wrong.
I believe dialing in the cams properly can make quite a difference. We can all go quicker down the quarter mile with a new clutch booked in for the following day. If Michelotto got 550hp from these (with serious mods) then there is plenty left on the table.
It's not just 25 HP though. That's 25 HP on paper, The Stradale is operating at higher potential due to the less restrictive backbox. Also not sure if US Stradales had pre-cats in the header (I know Modenas did). Its the 25 HP plus the made up power. Trev had a wonderful thread discussing all of this somewhere on here, he stated best case scenario for a Modena is like 360-370 crank in most stock configurations. Less if poorly maintained, slightly off timing, more if better options installed like the race/stradale exhaust.
^^If the best case scenario is 360-370 hp at the crank in a stock 360 per Trev, that means our 360's are healthy with a range of 285-315 whp on a dyno, calculating a drivetrain loss of 15-20%
Right, I would think the differences in the CS are taken into consideration of it's rated power. (including the exhaust)
I believe what INTMD8 is trying to convey is a healthy 2.7 355 engine makes at least 320 rwhp (on his dyno). If a 360 engine is making less (on his dyno), something is wrong. INTMD8’s current 355 engine setup (early 2.7 355 engine) makes 373 rwhp with full exhaust mods and without a tune. That’s your base line
Yes exactly. Thank you for translating my thoughts As for mine, yes but also milled heads, slightly bigger valves and many hours of porting everything that could be ported. Also revised cam timing and lighter flywheel.
You definitely have a lot of good work done to your car. I wish dynos were more standard between each other. Sounds like I also wish Ferrari was more accurate with their crank hp descriptions also
I also think when Ferrari says 400hp it would be dynoed with open headers. Then they put all the emissions crap on and that drops it down. A muscle car engine I built made 405 at the wheels on open headers. Dyno guy said exhaust too small. Took it away and fitted bigger open headers, no other changes. Same dyno and dyno guy, boom 30hp. Didn't touch the carb or timing. Gained 3 tenths on the quarter mile. Down to 11.4.
355 version of the engine also never had precats in the headers. 315-330 rwhp for a healthy modena makes sense.
Graph was printed on a sheet of paper over a year ago and is long gone. Sorry. I’ll get it dynoed again when @360trev finally releases his new carbon intake manifold with larger F430 TBs.
These cars are not very powerful. They are an NA 3.6L motor! With that said, it’s all the power I certainly need. With that also said, these crazy low numbers simply aren’t true or something is wrong with the car. Unless the two dynos I have used in two different states are way off. I went and looked back through my earlier posts, and here is how both did with my car. Dyno in Texas with Trev tune, headers, and high flow cats. Also timing was off. 356HP / 261FTLBS at the wheels Dyno in California with Trev tune, headers, high flow cats, exhaust, air injection deleted, and timing set exactly to 659/659. 370HP / 270FTLBS at the wheels Dynos are all gonna be different, and there are mods in my car, but if a 360 or CS is only putting down 300HP at the wheels, then there is something wrong. Check for a vacuum leak. The first dyno I did in Texas put down 306HP and we checked for something wrong and found a vacuum leak. Once fixed, the next dyno put down 50 more HP. Anyways, that’s what I got for ya.
