200whp with stock N/A rotating assay? by ForcedFirebird

3 minute(s) of a 31 minute read

Probably could use an adjustable gear with the block and head being shaved, but it doesn't have one. Probably just going to keep it simple, put larger injectors in and call it a day.

It does. 100% duty at 5500 and you can see the graph go lean after.

Thinking about 36lb to give some room, 850c would be a bit overkill lol.

24's might do it, but want to leave some margin.

It did go over 14 a few instances. Looking through the logs now. Was wondering why we got a stutter a couple times at high RPM. We only did about 7 pulls and a couple of them weren't full. There's a couple places the duty was much higher and the AFR's spike as if the injector just stopped firing.

EDIT: Found one log to be at 146.2% DC lol

1-25-2016

Put 24lb in tonight and preliminary tuned it, will dyno tune tomorrow.

Yeah. Just tough to get in high gears with a loud race car and industrial/public streets. If they are too small, will order, but the customer is getting antsy about having his car back. Did some rough calcs based on old vs new flow etc, should be in the 80's duty as you suggested. Time will tell though, eh?

1-26-2016

Had some fun today at the dyno. Made a best peak hp @ 217, but that was with the runners shortened and mid range TQ suffered. Overall best "power under the curve" was a peak of 214hp/202tq.

Sorting the graphs, will post some up.

Ugh. First I grabbed the wrong folder from the dyno PC, so can't post any graphs right now, but that's not the worst part.

The vapor in the video turned out to be a developing problem. Got worse today, so opened up the valve cover when we got her back in the shop. Lots of milkshake on the back of it, but dip stick looks clean - threw the pressure tester on it and that stupid #6 cam journal cracked

Pretty consistent with here. Duty cycle is close to yours, too. These Ford 24lb injectors are the single pintle and shoot pretty sharp.