CAMARO6 - View Single Post - TSP Stage 3 Cam (stock heads) results (C7 GS). Need heads...

Nabush · 07-19-2020, 10:27 PM

Guys,

Some (bad) news...

I bought the GPI Stage 3 cam, did a complete engine rebuild with new oil pump, crankshaft bearings, rod bearings etc...

I have exactly the same issue with the GPI Stage 3 cam, perhaps even worse.

I tried a stock ported IM manifold (weapon X) with no changes.

I started to run E85 today, my tune is far from being finished but I see the same behavior.

Like I said before I would assume a cam retarted a lot would mean the engine would be a dog below 3000 rpm...Which is not the case...

2 different cams, dot to dot like OEM, I don't see how 2 different cams from 2 different manufacturers could have the same issue.

Also, yes it did not degree the cam, but even if did and found it off by 4deg : 1- Jumping a teeth is 8deg 2- 4deg of retard would not create a dip from 3500-4500 right ? It would be all accross the range...

The only stuff I did not try is the exhaust. But a lot of people are running ARH without this kind of issue

Here is pic of my first E85 run this afternoon

Seriously this is getting old...

07-19-2020, 10:27 PM	#89
Nabush Drives: 2017 C7 GS M7 / 2017 Camaro SS 1LE Join Date: Dec 2016 Location: Idaho Posts: 198	Guys, Some (bad) news... I bought the GPI Stage 3 cam, did a complete engine rebuild with new oil pump, crankshaft bearings, rod bearings etc... I have exactly the same issue with the GPI Stage 3 cam, perhaps even worse. I tried a stock ported IM manifold (weapon X) with no changes. I started to run E85 today, my tune is far from being finished but I see the same behavior. Like I said before I would assume a cam retarted a lot would mean the engine would be a dog below 3000 rpm...Which is not the case... 2 different cams, dot to dot like OEM, I don't see how 2 different cams from 2 different manufacturers could have the same issue. Also, yes it did not degree the cam, but even if did and found it off by 4deg : 1- Jumping a teeth is 8deg 2- 4deg of retard would not create a dip from 3500-4500 right ? It would be all accross the range... The only stuff I did not try is the exhaust. But a lot of people are running ARH without this kind of issue Here is pic of my first E85 run this afternoon Seriously this is getting old...