gearheads78

iTrader: (29)

OK here is what I have
-stock rebuilt .010 over motor with arp bolts 11.5:1 CR
-241 heads ported (don't have flow#'s but they were done right)
-228/234@ 50 .607 / .598 on 110
-tr6 plugs
-SVO 30lb injectors but with stock pump
-ls6 intake with S3 ported TB
-UD pulley
-jet hot headers with 3" to X with 2.5" over the axle all mandrel bent
-A4 with 3800 vigilante converter
-moser 12 bolt 3.73 and 26" tire

A couple weeks ago with 300 miles on the new combo it made 400 RWHP and 332 torque. I don't have that sheet with me today to share. That was with the stock injectors and the AFR was very lean. The graph was pretty straight starting at 14.1 and ending about 13.8 at the top of the run. I also made some logs on the street and found I was at 96% DC on the injectors and getting 4 deg knock retard.

I sent the PCM back to the mailorder tuner to adjust for the 30 lbs SVO's and add more fuel to it. He told me he added 8% more fuel to the tune and tweaked a few things after looking at the dyno graph and my logs.

Fast forward to now. I got the PCM back and changed the injectors. The car seems to run better on the street. The knock retard is gone. The M/T drag radials will spin a good 25-30ft on concrete. Its not like its a turd. The car seems to run ok.

I went this morning and put it back on the same dyno. Now its still a little lean but the fuel graph is all over the place on both runs. The numbers are similar to what they were before. The HP is a little lower than expected but the torque seems extreemly low. Any ideas what going on? Here is todays run.

Patrick G

iTrader: (14)

That's actually very good power through an unlocked converter. The only way you'll get a better torque number is to lock the tranny in 3rd gear and start your run at a lower rpm. The torque multiplication at lower rpm will be very high.

gearheads78

iTrader: (29)

So that is good power for the mods I have? You get used to seeing all these M6 numbers around here and it seemed low. I plan on getting software and a wideband when I can scrape up the money so i can learn to tune it myself. This is my first non carbed hot rod so its a learning experience for me.

What do you think is causing the AFR to be so different on the two runs.

Denom

iTrader: (2)

I'm an M6 owner, and can tell you, it ain't what you put down on the dyno, but what you put down at the track. Get some track numbers, and see what times you pull. If you run in the 11's you should be happy.

gearheads78

iTrader: (29)

You are correct. I didn't build it for a dyno queen. The dyno was mainly for the wideband but seeing the low numbers and the AFR had me a little concerned. Do you all think its safe to take to the track as is even though its lean and the AFR graph is all over the place?

Zentenk

Duh, half the graph is chopped off, your torque would be higher down low.

Phlip00WS6

iTrader: (7)

Looks like its a little rich to me.

gearheads78

iTrader: (29)

How can you say mid 13's AFR is rich?

JakeFusion

iTrader: (7)

I think you may still need a retune for the 30lbs'ers. That A/F is way too lean on the dyno. Maybe have your tuner look it over once more.

Once you get it richened back up, you'll probably see a bit more power. And yes, A4s are not dyno queens. But you should be able to run some decent numbers with that setup.

vodas00ss

iTrader: (14)

maybe because he has no idea what hes talking about an decided to post anyway??

Phlip00WS6

iTrader: (7)

Hmm, maybe I was on drugs at the time because I thought that 13 was where 12 was..

slowredz

iTrader: (23)

I say mail order tunes are junk, every car is going to be different... And I know you live in DFW so you have plenty of shops to choose from. You need to cut your loss on the current tune and take it to Simplequick or RPM for a completely new tune. It will be the best $400 you have spent so far...

cantdrv65

iTrader: (3)

Those are good numbers! I would richen it up some though... Dont expect to gain much if any power though, you MAY gain a little midrange torque from more fuel.

'Trust'

iTrader: (24)

The graph looks different from many unlocked graphs I've seen. Its smooth, of course you know that the 12 bolt is holding you back and the 3.73's. Think of it this way, your setup is similar to mine, ported/polished 241's, the cam is bigger compared to my 224/.561/.561 112, and your stall is a lil bigger too (3800 compared to my 3500). I did 392/373 locked 10 bolt and 3.23's where as you did very similar with a bigger unlocked stall, gears, and a 12bolt.

TX99LS1

your converter is gonna soak up some power

s346k

iTrader: (4)

but why wouldn't a car with 11.5:1 compression yield better numbers than that?

it appears to have a few more hp...but that's it. also, i doubt the tq would be much higher earlier in the graph as the peak usually occurs between 4,500-5k. something seems awry, even with a 12 bolt through an unlocked converter, 332 rwtq is closer a bolt-on number. i'd pay to have that thing dynotuned, as i think you'd gain more than just "richening it up"..

moeZ28

iTrader: (7)

I agree completely. Mail order tunes are based on what a car should do in relation to what a few other cars did. Get a real tune that is tailored to what your car is doing and not someone elses car.

mike#9

iTrader: (3)

13 is a very rich AFR....compared to 19 AFR!!

LMAO

jimbob

iTrader: (4)

Here...I'l say it again.............."WIN PEP 7" kills TORQUE by the way it calculates....Totally different numbers than previous versions.....If you lock that verter then you'll know where you stand...The bigger the verter (more flash) the lower the number will be....closer to stock stalls or manuals will read the closest on torque, with that newer software.....On the plus side the locked vs. unlocked hp numbers are more correct vs. rpm up top. I used to see 400-500 rpm difference between those two, now the horse power peaks are almost the same.

383ss

iTrader: (14)

the graph is only from 5-7k?? looks like the dyno operator didn't know what he was doing. the tq will be much higher down low. I would have them redyno it. preferably for free.

numbers there look just fine to me