Dyno Pull yesterday (OBX Headers)

[lbszr]

Originally Posted by Shrek

She's going to run with the NASA group first, then we'll branch out to some other clubs. Even though she has many, many laps on track with the NCCC, we're going to start her off in group one until she learns to play nice with other cars on the track.

Let us know how it goes. Have fun!

[Shrek]

Added dyno sheets to post #19

[Paul Workman]

Originally Posted by Shrek

Added dyno sheets to post #19

Ah, Ha! I kinda suspected that! There's more gold in that thar LT5.

For comparison, a selection of curves I have on file; one (my first one = stock/Borla) and the rest = various mods. Ingnoring the numbers, it is the characteristic shape of the torque/power curves vs. rpm that I am trying to illustrate for comparision. See whatcha think...

My stock w/Borla (only)



Two for one: Don's and Dominic's after P&P, and Dom's with headers too maybe??



A 415 creation by Marc...



A 350, fully ported, stock cams and headers/3" exhaust...



And now, if I may draw your attention to your torque vs. power curve...

2012
[/QUOTE]

The torque curve is falling off too soon. I kinda thought from that stock 309 hp figure that there must be some more oomph hiding in there. Looks like there should be another 25-30 to be had if the reason for the torque collapsing could be addressed?? Something. (Cam timing crossed my mind first; is why I asked about compression check results. If one side was significantly different by comparision, it could be that "something".)

Spark? Cam timing? Who knows. I can analyze data and graphs with the best of 'em. But, for some real expertise, maybe Marc or Pete can shed some light on it. Something like 20-30 hp more to look forward to!

P.

[Shrek]

Thanks Paul! "When" it starts to drop off doesn't look to be too bad! It's the linear dive vs. the gradual curve down as seen on the other graphs that concerns me.



Here's a graph from my buddies stock 93 with Power Effects.

1st pull...key off & power effects open...HP-238.49 TQ-308.21
2nd pull...key on & power effects open...HP-360.81 TQ-332.90
3rd pull...key on & power effects closed...HP-346.94 TQ-332.07

[mike100]

Stock LT5's should be peaking around 5900 rpm...maybe a couple of hundred rpm higher for the 405hp cars.

I would not get too carried away with wondering how the cams are timed etc until you check the fundamentals. You should be able to pull to 6000, especially with headers. Is your intake boot collapsing?

Looks like you have plenty of fuel up high..like too much, I would have expected 12.5 AFR from the factory VE table.

ON Edit: extrapolating that curve should put you at at least 350+ whp

[L8apex]

Originally Posted by Shrek

She's going to run with the NASA group first, then we'll branch out to some other clubs. Even though she has many, many laps on track with the NCCC, we're going to start her off in group one until she learns to play nice with other cars on the track.

Best of Luck on the track. Wish I were there to see her get back in the Road Course Saddle with other cars on track. At least she is not going to have to deal the the famous "Kink" and add a third Red, Red '91 ZR-1 to the loop de loop group Brooke and I started!

[SteelBlueZR1]

Originally Posted by mike100

Stock LT5's should be peaking around 5900 rpm...maybe a couple of hundred rpm higher for the 405hp cars.

I would not get too carried away with wondering how the cams are timed etc until you check the fundamentals. You should be able to pull to 6000, especially with headers. Is your intake boot collapsing?

Looks like you have plenty of fuel up high..like too much, I would have expected 12.5 AFR from the factory VE table.

ON Edit: extrapolating that curve should put you at at least 350+ whp

Any updates on issues possible for low rwhp vs conservative dyno?