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Mar 15, 2020 | 06:07 PM

Wvstingray16

Thread Starter

Racer

Joined: Feb 2016

Posts: 284

Likes: 105

Help!!!!

Just had 1 7/8 Ts headers and x pipe installed

Then got it tuned with hp tuner

After had misfire in 3th cylinder, new plug fixed that

Then mustang dyno

After dyno got codes P0700 and U0073 Car wouldn’t shift out of 4th gear. Turned it off, waited a few minutes, restarted car. Shifts fix now but codes still on. Is this just bc of the dyno and back wheels going 120 mph when front wasn’t moving?

Also what do base c7’s pull stock? Figured I’d get more from headers than I did.

Thanks

Mar 15, 2020 | 06:16 PM

Zchris

Instructor

Joined: May 2018

Posts: 168

Likes: 87

From: Port saint Lucie FL

Mustang dynos are notorious for putting out lower numbers than say a dynojet. Keep that in mind. I believe 405-410 rwhp is probably about normal on a stock LT1.
Wish i could help with your other problem but im sure someone else here will.

Last edited by Zchris; Mar 15, 2020 at 06:17 PM.

Mar 15, 2020 | 06:18 PM

DPC57

Pro

Joined: Jun 2016

Posts: 607

Likes: 330

From: Fredonia Mountain, TN

My 2017 Z51 M7 pulled 398 on a mustang Dyno, roughly 15-20 HP less than most Dynojets reported. No problems doing the pulls other than a bunch of OnStar alerts.

Mar 15, 2020 | 06:38 PM

Wvstingray16

Thread Starter

Racer

Joined: Feb 2016

Posts: 284

Likes: 105

With headers

Mar 15, 2020 | 08:37 PM

LT4CMG

Le Mans Master

Joined: Mar 2016

Posts: 9,175

Likes: 4,015

From: 2019 CMG Z06/ZR1

M7 or auto?

Mar 15, 2020 | 08:40 PM

TxLefty

Race Director

Joined: Apr 2014

Posts: 10,469

Likes: 1,758

From: North Texas

Did they do a baseline dyno test?

Mar 15, 2020 | 08:56 PM