Was bored last night and got to comparing my "bolt on dyno" to "cam dyno." I noticed some dips in the 3000rpm range and also 4300rpm range of both TQ and HP.

From comparing several other ls1 dyno graphs it seems this is common, but I was just wondering if that is indeed the case and why my bolt on dyno is so smooth?

Thanks for the help!

 

yes, is normal.

 

Yes it's normal depending on the intake you have. Look at Pat G's sticky in the Gen III Internal engine section. He explains the dyno double dip in one of his write ups. He says its due to the intake not able to move enough air for the engine setup.

I just added a Fast 92 to mine and the dip was non-exsistant. Flat torque curve, and a steady smooth HP curve.

What are your mods? What intake do you have?

 

I would try a leaner AFR in the 4200 RPM Range to try to "Iron" the dip out as much as possible...

As for the FAST 92 making it disappear... Mine was still there with a FAST 92 and Ported 243's.

 

Awesome, thanks for the replies guys. I will also check out that stickey as well.

 

Do you remember witch one by chance

 

2002 Trans AM Ws6 M6
TSP Torquer V2 114lsa
Comp 918 Springs
Powerbond 25% pulley
TSP 1 3/4 headers
TSP ORY
SLP LM2
SLP Lid
Potz P&P throttle body
MSD Wires

Stock LS6 intake

 

Sometimes they can be tuned out and sometimes not. Impossible to know without seeing the tune and what adjustments were tried.

 

Had and Ls3 camaro on the dyno yesterday same dip, leaned it out around 13.2 in that range and it helped it (didn't eliminate it, but helped)

 

Good insight, thank you!