dyno sheet - does this look right?
dyno sheet - does this look right? Here's a dyno graph. I'm curious as to the dips and sudden fall off along with low results. I have stock bottom end, custom cam 23x/23x .6XX .6XX, 1.6 rr's, 185cc ported heads along with all the supporting mods vig3200 58mm tb ported intake 36# inj., and 8.8 w/ 4.10's. Online calculators say it should be 425rwhp., as you can see its a little off. 
This is quiet depressing.
Dyno Sheet
Everyone I've spoken with agrees that something doesn't look right and the power off. the rwtq is embarrassing at 315 when stock I dyno'd at 265rwhp/296rwtq SAE
Could the tq converter be slipping at 5k rpms causing loss of power? The converter is the only used part I installed during the upgrade. Converter was also unlocked during these pulls since the only information we had was vig3200.
This is quiet depressing.Dyno Sheet
Everyone I've spoken with agrees that something doesn't look right and the power off. the rwtq is embarrassing at 315 when stock I dyno'd at 265rwhp/296rwtq SAE
Could the tq converter be slipping at 5k rpms causing loss of power? The converter is the only used part I installed during the upgrade. Converter was also unlocked during these pulls since the only information we had was vig3200.
Last edited by illusions; Mar 1, 2010 at 07:54 AM.
230/238 and leave the rest as x's, these are stock castings ported.
I purchased the converter from a member here and do not have information on whether its a single of multi disc converter. my tuner will not lock a single disc converter on the dyno. so with not knowing what I have he has to be safe. All I know about the converter is its a vigilante 3200 stall 9.5"
Originally Posted by ls1adamls1
the converter needs to be in lock up mode if its a lockup converter.
if it is what you say it is here are the specs...Vigilante 9.5" Single Disk Lock-up Torque Converter, 200R4, 700R4/4L60E, 4L80E
http://thunderracing.com/catalog/?ac...cid=73&sid=297
http://thunderracing.com/catalog/?ac...cid=73&sid=297
if it is what you say it is here are the specs...Vigilante 9.5" Single Disk Lock-up Torque Converter, 200R4, 700R4/4L60E, 4L80E
http://thunderracing.com/catalog/?ac...cid=73&sid=297
http://thunderracing.com/catalog/?ac...cid=73&sid=297
Real world results with those mods are closer to 410 crank HP, properly hooked up through the driveline you should see in the neighborhood of 365-370RWHP on an A4. If your vig 3200 is a multidisc and can be safely locked, you'll see 365-370 and about 360RWTQ... maybe a touch higher, but not much. And those HP and TQ curves will look a lot better.
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Real world results with those mods are closer to 410 crank HP, properly hooked up through the driveline you should see in the neighborhood of 365-370RWHP on an A4. If your vig 3200 is a multidisc and can be safely locked, you'll see 365-370 and about 360RWTQ... maybe a touch higher, but not much. And those HP and TQ curves will look a lot better.
Without flow numbers and who ported them any guesses are completely random.
You need to get the car to a track and check your et/mph. Stalled autos dyno horribly, especially unlocked.
Also, your drivetrain loss is way off. He will make more then 410 flywheel but even so 370 is a bit much for rwhp through a stalled auto. You estimated only around 10% drivetrain loss, which is too low even for a manual. His drivetrain loss is closer to 25% with what he is running.
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see if you can get your dyno print out in MPH instead of RPM
then look at the MPH that they lifted on the graph and compare to the RPM they lifted at.
I bet you are having converter issues...have a good friend that dyno'd 300ish rwHP on a nice little 383....after fixing the converter he made 420whp
and on the "tiny 185cc" comments....I made 422rwhp and 447rwtq with a 222/228 .544/.538 112lsa cam and ported LT1 castings with 188cc intake runners.
then look at the MPH that they lifted on the graph and compare to the RPM they lifted at.
I bet you are having converter issues...have a good friend that dyno'd 300ish rwHP on a nice little 383....after fixing the converter he made 420whp
and on the "tiny 185cc" comments....I made 422rwhp and 447rwtq with a 222/228 .544/.538 112lsa cam and ported LT1 castings with 188cc intake runners.
[QUOTE=Ray@Nitrous
and on the "tiny 185cc" comments....I made 422rwhp and 447rwtq with a 222/228 .544/.538 112lsa cam and ported LT1 castings with 188cc intake runners.[/QUOTE]
Yes, but since you know your **** it is a given that your heads were professionally ported by someone who knew what they were doing. I did not mean to infer that the heads were too small to work, just that two heads can have 185cc intake runners and have a huge performance difference so that number does not mean much by itself.
We know absolutely nothing about his heads besides the runner size and that they are stock castings...I just find it silly trying to guess horsepower when we are missing info on the most important piece of the puzzle.
By the graph is is clear that he is having issues, but nobody has a clue what it "should" be making peak since we know zilch about the heads. They could be Billy Bob's Backyard Dremel'd heads and not be worth 5hp...we just don't know.
and on the "tiny 185cc" comments....I made 422rwhp and 447rwtq with a 222/228 .544/.538 112lsa cam and ported LT1 castings with 188cc intake runners.[/QUOTE]
Yes, but since you know your **** it is a given that your heads were professionally ported by someone who knew what they were doing. I did not mean to infer that the heads were too small to work, just that two heads can have 185cc intake runners and have a huge performance difference so that number does not mean much by itself.
We know absolutely nothing about his heads besides the runner size and that they are stock castings...I just find it silly trying to guess horsepower when we are missing info on the most important piece of the puzzle.
By the graph is is clear that he is having issues, but nobody has a clue what it "should" be making peak since we know zilch about the heads. They could be Billy Bob's Backyard Dremel'd heads and not be worth 5hp...we just don't know.
The heads were done by a reputable shop that many have used here on tech. I don't want to name names since this is not my build, but I did help them out a little with it. I still think it needs to get to the track asap and see how it does, the only thing that is weird to me is the dip in the graph. Anyhow, it could be the converter eating power, or it could be a bad converter. Hell my car dynoed 330/298 but traps 89mph and recently dipped into the 7's letting out 200 or so feet before the traps.
Thanks Matt. And thanks for everyone who has replied. I appreciate the comments and help trouble shooting this.
I'm not mentioning the shop that CNC'd the heads because I'm not going to start a this shop vs that shop flame war. these heads flow on the intake side 261 @.50 and 271 @.60 with exhaust in the 19X area. I do not have the sheet in front of me.
The cam specified should also make power to 6500 rpms instead it falls flat on its face at 6200 rpms. Converter slippage? that's what I'm beginning to thinks happening since this is the only used part installed along with only seeing 315 rwtq.
I'm not mentioning the shop that CNC'd the heads because I'm not going to start a this shop vs that shop flame war. these heads flow on the intake side 261 @.50 and 271 @.60 with exhaust in the 19X area. I do not have the sheet in front of me.
The cam specified should also make power to 6500 rpms instead it falls flat on its face at 6200 rpms. Converter slippage? that's what I'm beginning to thinks happening since this is the only used part installed along with only seeing 315 rwtq.
Last edited by illusions; Mar 2, 2010 at 06:16 AM.
Trans is a complete upgrade rebuild to handle the added power it's suppose to have. This was rebuilt by a very reputable local guy who's rebuilt many transmissions for high HP/TQ setups.
Considering the deal I got on the converter I'm leaning in that direction. The whole deal with the converter sale on here had a slight sour tone to it.
Considering the deal I got on the converter I'm leaning in that direction. The whole deal with the converter sale on here had a slight sour tone to it.
I would absolutely get the converter looked at or just take it to the track and see what it runs. Does it seem like it falls on its face at around 4800rpm on the street? Did all the pulls look the same or did it smooth out as it was getting tuned?