4.1L dyno numbers
06-23-2013, 03:03 AM
#17
bottom line is dyno is a tuning tool, not a bragging rights tool. As long as you're happy with the results you have and understand how they were generated, you're all good.
My comment about 1/4mile trap speed or 60-130 times is based on real world physics. We can weigh the car, and if we have the trap speed over a fixed distance we can calculate amount of power required to accelerate the car to this final speed over the prescribed distance. No quibbling over correction factors, or tire inflation pressures, or wheel sizes, or dyno makers. Simple physics. I plan on heading to the drags when my 4.2 is done. Would like to do a 60-130 pull but will need to plan that for when I can't get arrested.
All the other forum drama, I try to stay out of...
06-23-2013, 05:18 AM
#18
0-60 60-130 or whatever doesn't reflect accurately power or torque, drag from tyres, cd etc all play a big role there.
A proper engine brake (dyno) is the only true way and even then only against itself to provide deltas from one set up to the next.
Jay
A proper engine brake (dyno) is the only true way and even then only against itself to provide deltas from one set up to the next.
Jay
06-23-2013, 10:34 AM
#20
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(I do not mean to thread hijack, just sharing info)
Thought I would share this (earlier than I wanted) but actual data vs all talk
Recent 07 3.6RS to 4.0
Mahle 105.4
Stock DME
Stock Air box
Headers/exhaust
As you can see air fuel is great even with stock DME even if ign timing and cam timing is not optimized. I also have another intake air box to test as well as a 4.0 intake manifold and another custom one and some tuning on top. Solid 50whp gain from 6600rpm to 8400. Car is just plain fast and fun. Also has full regear to keep in the top end power all the time.
Dyno charts are SAE CORRECTED not actual or DIN which on my dyno reads 8-10% higher. I have dynod a lot of GT3's and they always put down the same number stock.
996-3 stock 338-340whp
996-3 LWFW 355-357whp
997-RS 358-361whp
Thought I would share this (earlier than I wanted) but actual data vs all talk
Recent 07 3.6RS to 4.0
Mahle 105.4
Stock DME
Stock Air box
Headers/exhaust
As you can see air fuel is great even with stock DME even if ign timing and cam timing is not optimized. I also have another intake air box to test as well as a 4.0 intake manifold and another custom one and some tuning on top. Solid 50whp gain from 6600rpm to 8400. Car is just plain fast and fun. Also has full regear to keep in the top end power all the time.
Dyno charts are SAE CORRECTED not actual or DIN which on my dyno reads 8-10% higher. I have dynod a lot of GT3's and they always put down the same number stock.
996-3 stock 338-340whp
996-3 LWFW 355-357whp
997-RS 358-361whp
06-23-2013, 04:39 PM
#21
Rennlist Member
10 GT3 you are absolutely correct. I am breaking my silence in the forum after the GMG bullcrap!!!! Too many blind suck ups around here.
I have PM'ed the OP and no response. I would try to help and add to factors dealing with a build but he has not responded to me. That's just fine.
My 3.6 to 4.154L build has been documented and with Dynojet graph.
Serge, please post dyno graphs of your 4.0 bore build. You seem to be the "gold standard" for a 4.0 builds. My Champion Motorsport build is a POS by your standards.
OMG why do I even bother as an amateur dealing with all these experts? Us starving marvin need to go home and coward under our beds.
Ranger (Sua Sponte)
I have PM'ed the OP and no response. I would try to help and add to factors dealing with a build but he has not responded to me. That's just fine.
My 3.6 to 4.154L build has been documented and with Dynojet graph.
Serge, please post dyno graphs of your 4.0 bore build. You seem to be the "gold standard" for a 4.0 builds. My Champion Motorsport build is a POS by your standards.
OMG why do I even bother as an amateur dealing with all these experts? Us starving marvin need to go home and coward under our beds.
Ranger (Sua Sponte)
But since you're attacking me, I'll state that anyone with deep pockets can drop $100k at a shop, but not everyone sweats and swears into the late hours of the evening trying to push the middle cylinder piston rings into the liners.
Here's my baseline 4.0 dyno chart, right after engine break-in. No tuning. Tuning added another 20hp and even further increase in the mid range torque. Matt can share this info if he chooses.
Also, note how much difference gear choice makes on dyno results. Runs 1-3 were done in 5th gear than run 4 was done in 4th.
