[ZLRob]

Originally Posted by djctoto

Letting the results and data supplied to me speak for them self.

After spending approximately $15K with Patriot Motorsports USA to have them perform a numbers of modifications including tuning on my 2019 ZL1-1LE I witnessed a dyno run and was provided with the following screen shot as the only data. This was done with an Ethanol mix at E30.

No Actual Graph was provided and the peak torque value at 2865 rpm is suspect.
https://drive.google.com/file/d/1pMo...usp=drive_link

After the addition / installation of 2" ARH headers their 3" x-pipe / long system, the removal of cats. And adding a MAMO blueprinted throttle body I then had the car re-tuned, no other changes were made and received the following data:
https://drive.google.com/file/d/1cIH...usp=drive_link

Comparing the e30 results:
Patriot Motorsports Max HP 661 @ 4862 rpm Max Trg 753 @ 2865 rpm
New Dyno Results Max HP 654 @ 6227 rpm Max Trq 663 @ 3598 rpm
Delta Max HP -7 HP Max Trq -90

Again the data shows that the actual results from Patriot Motorsports that I received. Even with the differences from Dyno to Dyno how is it possible that my engine produced -90 ftlbs of torque to the wheels after the addition of ARH 2" Headers along with the removal of CATs and the addition of a 3" x-pipe and long system into the same stock suitcase muffler.

My only guess the screen shot provided by Patriot Motorsports is flawed somehow? Buyers beware is all I can offer.

Well the first thing to address, E30 doesn't have as much potency as E40-E50 which is where you start seeing some big benefits.


I don't know your mod list, but a throttle body is not going to provide meaningful dyno results. I may get torched for that, but after my debacle with my Soler throttle body, which is supposed to be ported and larger than OE due to it's porting (87mm but 91mm effective), it made me realize that what you are being sold is a difference in drivability, not actual horsepower and torque pick up. At least not in the more OEM power ranges.


I've always been a big proponent of a properly configured exhaust system. I won't get into it about headers vs factory manifolds, but I am certainly still running factory manifolds which are technically shorty headers. Say what you will about them but they have shown that they are more than capable of putting out and handling big power. At least in my situation they definitely have.


It may entirely be possible that you lost power due to opening up the system more than it's capable of breathing in and out. As in, you went too large on your openings and exits. You may want to consider a pulley if you haven't done one already. It may do a better job at picking up the boost that you may have lost and restoring you back into a range better suited for power delivery.