well met up with a buddy last night and he said there was goin to be a dyno day for this mustang club he hangs out with. he said they were real chill guys and wouldnt mind so i went. ran my car twice and got exactly the numbers i was expecting. ive been tuning it myself with hptuners and surprised how close i got it. it was funny cause they were all about to leave and then i pulled my car up and they all stayed.

car is 1991 z28
2001 5.3l
2001 4l60e stock stall
3:23 gears
ls1 intake
2002 ls1 cam
28lb injectors

 

Pretty decent numbers going through the auto. What is your exhaust set up? You have headers or no?

 

Nice numbers

 

2002 manifolds to 2.5" to a 3" y to some whatever flowmaster. i was surprised on my tuning being that is was my first time.

this but without the cat.

 

over 300rwtq..nice.That 5.3 is putting in work for what it is.Hp is down so Im assuming your not using longtube headers etc..just a basic exhaust.Got any vids of it?

 

Hows the ground clearance with that exhaust? i'm currently fabbing mine but trying to route it under the pass. floor pan area and having a hell of a time....

 

ground clearance is a little tight. have to watch goin over speed bumps. i have a set of 02 manifolds.

 

your y pipe looks just like mine but I did dual 2.5 high flow cats right after each manifold and merged it into my 3" pipe.It tucks up a lil better this way since the cats are beside the trans,I dont scrape speed bumps unless Im going too fast over steep bumps.

 

yeah i only really hit them if i go fast and it slams down on them.

 

Not bad numbers at all! You still have room to grow with a LS6 intake, UD pulley, p&p tb, etc.

Keep up the good work

 

eh the car has been sold since like november so im not really changing anything. gotta finish my iroc now. hopefully takin it tomorrow or tuesday to my exhaust shop to finally get the hot side done.

 

This is my half a$$ed dual catted y pipe.They are magnaflow high flow cats,wish i had a pic when they were on the car.Im going to have a new pipe made up with the cats for a smoother transition and see if i can tuck the passenger side cat up maybe a 1/4 inch so it wont scrape anymore.

 

not bad numbers. get the A/F ratios a bit richer and you should pick up some power. typically, 12.7:1 is ideal. but for the newer stuff, it may be different.

 

correct, engine tuning and theory dictates that ~12.6 is max torque on an N/A gasoline engine. Anything richer and its a downward slope for power/tq and unnecessary richness. Anything leaner and you might run into issues with knock.

 

Well im happy to see those numbers.. I am runniing the truck cam tho.

 

What up dude, did you ever ended up selling the 1991 to your boss?

 

Guy with carbed only 5.3 made 271 running rich, just for comparrison, stock cam.

 

That single cat and flowbastard are holding about 20rwhp.