355 Socal 355 Dyno Check-ins

Easy theory to test, just do a pull on the dyno with the intake y-pipe removed so the intake starts just upstream of the MAF and skips all the rest. Y-pipe takes 3 mins to remove.

I'd be happy to try it on my car and suspect it'll make virtually no difference. The airboxes, air filters, and intake plumbing on a 355 is big. I doubt it's a restriction. And remember, with intakes and exhausts, you need the right amount of restriction, because this is what helps accelerate airflow into and out of the combustion chamber. Bigger is not better. Block off the end of a garden hose with your thumb and what happens to the water? It flows faster. Basic fluid dynamics.

 

IMO not much to be gained by induction tubing. It's much larger than the maf sensors/intake tract leading to the plenums on a 2.7 car. (though squished over the radiators on 5.2).

And definitely a help at speed with ram air effect (that you won't have on the dyno)

 

no way, not intake alone intake AND engine management on that 348. That is a bit mis-leading what they have listed.

 

You never want a restriction but to your point, too large of induction (intake runners/throttle bodies, not pre airbox or airbox) or exhaust can slow velocity and reduce volumetric efficiency. (by less exhaust scavenging or induction ram effect)

At ideal sizing you would never be to the point of a restriction, such as, a measured vacuum on the induction side or pressure build up on the exhaust.

 

Very true, it's just a diagnostic tool. Moral of story is, they all read differently, even if it's by the same manufacturer, the operator can make it output whatever they want to inflate the egos if they believe a owner might want a slightly more optimistic reading. It's only a relative comparison when multiple cars are measured on the same dyno.

If anyone is actually trying to see power differences between parts, make sure the testing is done on same dyno and in near identical conditions. If the ambient temp was different, even if the same dyno and same car the results are still somewhat inaccurate.

 

The operator of a dynojet can't make it "output whatever they want it to". Maybe others are more easily manipulated.

But yes, it is a tool and most useful when back to back on the same machine on the same day. Not always possible however.

All things considered, I also back up my dyno numbers with dragstrip results. At 340rwhp, 3150 raceweight, 12.403 @ 116.83mph on the rev limiter through the traps (measuring beam at end of track)

So if anyone thinks I'm on a happy dyno, easy to prove by beating my numbers at the track

 

If functioning correctly (and many aren't) it will be open before an rpm it really matters. Unless you're JohnK

 

I'll send you mine if you want to do a comparison

 

I would send you the one off my car.

You could wire the bypass open or just watch it during a pull

 

No. Would only send it if you guys are.

 

just read through most of this thread.. the Dyno sessions sounds fun for comparisons.. not that I'd be making it out there lol..

im no expert.. but I don't think the 355 engine is too reliable to make accurate comparisons.. in comparison to mass produced engines/cars

meaning someone posted above, he had a rebuild. assuming valves, guides etc..
compared to another 355, that may not have the most optimal compression, leakdown etc..
so most likely, all equal, the cars will put down different results..

its fun, awesome to see results.. and just thinking out loud, but I would think the 355 engine is a bit too delicate, in terms of its overall health, condition etc..

delicate, I don't mean its going to explode, i bring my car to red line, 1st, 2nd, regularly and it loves/thanks me for it..
delicate meaning there are so many variables, for it to be running as optimal as possible. and that optimality can vary significantly from car to car. so an all "stock" car compared to a car with a few exhaust mods, may not actually be a reliable baseline of comparison etc..

 

I agree. It’s like saying the 2.7 is faster than a 5.2 which wouldn’t be the case if the 2.7 is down on compression and the 5.2 has a rebuilt top end and Tubi headers. It’s very hard to have an even baseline at this age and with the variance of maintenance items being addressed.

 

CHurches or World Motorsports
Carson and Torrance
Churches hub dyno World wheel
Worlds dyno is also a wind tunnel


https://world-motorsports.com/dyno/

 

And about 20 other things that get overlooked LOL