Dyno run on out of box 393

[5.8CAPRI]

Well got my 393 running, and took it to a dyno for a baseline run. This was with 0 tuning. Stock A9P, 13 base timing, about 40psi fuel. Oh yeah, and for now, stock airbox and rubber tube between MAF and TB.

Max RWHP: 343@5150
RWTQ : 414@2750

Not so happy with the HP, but pleasantly surprised with the TQ for an initial run, and at such a low rpm. I know some of you are able to analyze numbers and know about how much more is left on the table. My A/F ratio at peak HP is 12.9 which I believe to be a bit rich for peak pwr. I am thinking that the stock airbox and tube are really choking it down since my pwr peaks at only 5150. I know, I know, spend so much on a motor, and cheap out on the filter. Any, what are you guys with similar combos puttin out, all tuned up?

Edelbrock Vic JR 70cc heads
Scat 393 stroker crank
TFS 351 intake
75mm BBK TB
75mm PRO-M MAF
30lb inj
XE282 roller cam
BBK 1-3/4 ceramic longtubes
BBK X-Pipe
1.6 roller rockers
10.5:1 CR
Everything else for added strength or looks.

 

[vristang]

What's up Lake Stevens!

I don't have any power numbers to offer, but would like to hear some tuned power levels.

jason

 

[2000xp8]

Even the meter is likely a restriction there. Use an afm NA power pipe, 80mm pro m, and i'd bet you pick up quite a few HP.

 

[Grn92LX]

12.9:1 up top is perfect for your n/a engine. remember, on the street you WILL be leaner as a chassis dyno doesn't put a real load on the car like the street does.

I see a few bottlenecks. Your exhasut is a big bottleneck IMO. Did you grind open the restrictive bbk collector? They neck down to near 2.25" take a grinding tool and open it to 3" or as close as possible. Ditch that 2.5" x pipe and go 3".

A custom cam will pick up a lot of power. I would also consider a box upper for that R manifold if it fits under your hood.

Tuning will help too.

 

[Redrooster]

You really need to throw the stock air box and tubing away. I would go with a 90 mm MA,90 mm throttle body, AFM power piper or something similar, and 3 inch exhaust. I don't know the specs on your cam but I think you should be making another 100hp or more with a good tune.

 

[BaXTeR3221]

I agree with what these guys said, sounds like there is a lot on the table. I would have gone custom cam and N/A powerpipe. Sounds like your off to a good start though, 343 is nothing to sneeze at. I would bet you could easily get 400 out of that. Good luck

 

[5.8CAPRI]

Thanks for the tips. The reason I haven't chucked the stock tube yet is because I will need a custom one made, since I have hood clearance issues. I have the Factory Capri hood scoop that I really like, but it is not quite wide enough and actually hits the air tube about 1.5" from the TB. And I am not fond of the normal cowl hoods. Sooo....There I am there.

Anyone have a link for where I can look up CFM flow of TB's, and engines and stuff? I am looking for a well matched street motor that makes tons of torque, and good power. So I don't want to just go out and throw the biggest everything I can find on it. Besides, I am freakin broke!! (Recently blew the motor in my Super Duty PSD) If I can reach 425/450 at the tires, I would be happy. There is always boost later

And there has got to be some of you out there with similar builds that have dyno'd. I want to see some numbers!!:SNSign:

 

[Blk91stang]

12.9:1 up top is perfect for your n/a engine. remember, on the street you WILL be leaner as a chassis dyno doesn't put a real load on the car like the street does.

I see a few bottlenecks. Your exhasut is a big bottleneck IMO. Did you grind open the restrictive bbk collector? They neck down to near 2.25" take a grinding tool and open it to 3" or as close as possible. Ditch that 2.5" x pipe and go 3".

A custom cam will pick up a lot of power. I would also consider a box upper for that R manifold if it fits under your hood.

Tuning will help too.

My buddy has a 302 with 1-5/8" bbk longtubes making the same hp he is making along with a 2-1/2" h-pipe. I don't think his exhaust is hurting him of his 70+hp he is missing somewhere. I would think the intake setup could be a big restriction though.