Swervin309

I did a dyno run after flashing a new tune (Brenspeed) that was updated for the new mods. Numbers were 291 @ 5400/308 @ 4400 (275/294 previously). I noticed that the torque curve was rather lumpy and would spike and flatten for a few hundred RPM. Is this normal? Tuning? Or am I retarded? Thanks guys.

Tylus

what are your mods?

LT's with cat delete? if so, ensure the rear O2's are turned off

Swervin309

BBK CAI, BBK 62mm TB, Shorties, Dynomax Ultra-Flo Welded muffs, 91 tune.

Tylus

Check for air leaks on your Cai and TB. That can cause wierd spikes


Not bad numbers otherwise for relatively unmodded. How was your A/F ratio?

Swervin309

No leaks. I checked everything before I pulled.


Not sure. I haven't put a wideband on it yet. Although she did like being "2% richer".

SpartaPerformance

No it's not normal at all. Your torque and HP curves along with your AF ration should be as smooth as possible.

Swervin309

Simon1

Is this an automatic?

From the looks of the run I would say something off on the dyno.

What did the shop say?

Swervin309

Nah, it's a 5.

The shop didn't say anything other than "Your HP curve looks smooth". I gives a s*** about HP.

Simon1

I torque curve like that would be felt by the driver and probably heard from those listening. Point to the spot on the graph and say WTF? What is that? Make them explain.