Engine Dyno Results

Finally got the 4L build on the dyno. Took a bit of custom machining to get a 328 engine that sits on it's gearbox hooked up to a superflow dyno.

It survived and put out decent power. Was really shooting for 600Hp. Had to source a set of 348 headers last minute as our custom units are still not done. A big thanks go out to Russ at Ferrparts for sending us a set overnight! The 348 headers are still not BIG enough for this engine, the headers are supposed to be 1.8" primaries with a 3" merge, think 458 size. So as a result the power is down from about 6.5k on up.

I modeled the engine in the sim and results are just about spot on to the dyno results. The numbers are not corrected, correction factor should be 1.05, it was a hot humid week at the dyno. The poor dyno also ended up blowing it's manifold at 8.5k rpm and flooding the room, that upped the humidity like crazy! Also brought an end to testing and tuning. The dyno servos were not balanced and could not be balanced apparently as a result it would surge terribly below 3k and above 8.5k, wanted to tune out to 10k as it's been designed to run out to 11k. Dyno couldn't get there though

Next time it's on the dyno it'll be a chassis setup.

One of the best runs hit 527Hp @ 8700rpm corrected.

Thought I'd update the group on the long 4L ITB project..
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Thanks, it's been a lot of work to get to this point. It's a lot of power from 3.93 liters... At the moment we've got an honest 475Hp, that's 120 hp/L.

 

The gearbox this engine is mated to has been completely gone thru, I replaced every bearing, new baulk rings and a couple gears, even sourced a NOS main input shaft. That was only due to the fact that the main shaft and a couple gears were corroded due to rust. Otherwise the boxes will handle the power with no real issues. The internals of these boxes are shared with the GT40 and a couple other high HP/TQ engines. You should not have any trouble provided the oil is changed as needed and check and clean the pump filter at least every other yr. Yes the later gearboxes have a pump and filter, I've seen a few completely clogged with junk, and probably never checked since it left the factory.

 

F&L 111 race fuel, ECU is the new Link Thunder.

 

Why the street of course

Here's a couple threads that cover the bits and pieces of the build.

http://www.ferrarichat.com/forum/308-328-sponsored-yellow-compass-group/521995-itb-4l-progress.html

http://www.ferrarichat.com/forum/308-328-sponsored-yellow-compass-group/501444-engine-jewelry.html

More pics and vids soon, Nick has the dyno pics and vids.

 

Yes, I've built and run a number of high hp engines running thru the gearbox. One with just a bit over 700Hp. The gearbox can handle the power, the clutch is a different story all together.

 

Are we talking 'shock loads' ? The CV joints and axles are not capable of handling 'clutch dumps'. As to the power and tq output keep in mind that at high rpm the tq loads are actually quite low compared to say a big block ford engine at low rpm. Pk tq is only in the mid 300's that's not very much at all. It's just happening at very high RPM points, hence the high Hp numbers. The gearbox has no problem handling a modist 350ft/lb of tq. compared to Ford's 450+lb/ft

But yes the gearbox and drive train have no trouble with 450 or 500 Hp at 8k rpm. The clutch's limit is the pressure plate clamp load. It's possible to break anything, but in normal use and not dumping the clutch it's capable of these power increases. Many have turbo charged, supercharged and increased the displacement of these engines all going thru the stock box without trouble.