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FLDak
Dodge Dakota
JOIN HERE
6/23/2003
11:25:05
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 Subject: Dyno results for 4.7L
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I took my truck, 02 Dak CC+ AUTO, to Professional Engine Service in Mobile, AL to dyno it.
Best run with IAT sensor in CAI tube:
Max RWHP=205.3
Max RWTQ=265.6
Best run with IAT sensor in stock location:
Max RWHP=200.8
Max RWTQ=259.4
The following is a list of my mods:
360 Intakez, TPS adj, removed clutch fan, removed 3rd cat, Autolite 3923, Flowmaster 70 series single in/dual out, Motive 4.10 w/LSD, Fastman true 68mm TB. Used 87 octane.
I hope this provides some useful information on how much difference some mods help. It appears just relocating the IAT does make a difference. This was the first time I dyno'd my truck.
According to some previous post, if this formula is correct, my truck should be making 257HP(RWHP*1.25=HP@Flywheel) at the flywheel. I don't know how to post the graph and charts, sorry.
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IntenseDak39
*GenIII*
6/23/2003
12:01:24
|  RE: Dyno results for 4.7L
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Very Nice!!
glad to see testimonial about debatable mods!
is debatable a word? lol
1998 Regular Cab V6 Auto
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CThomp
*GenIII*
6/23/2003
12:59:51
| RE: Dyno results for 4.7L
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I had no idea just moving the IAT to the air intake would be worth that much power. Guess I've got to bust out my drill.
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mb
Dodge Dakota
JOIN HERE
6/23/2003
13:00:11
|  RE: Dyno results for 4.7L
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Message:
Great run.
Using a 25% driveline loss, your crank numbers would be:
273.7 HP peak crank
354.1 TQ peak crank
Your above formula you found is flawed. You must DIVIDE not multiply.
205.3 @ wheels DIVIDE by .75 (25% driveline loss) = 273.7
I actually think the driveline loss is more like 15% but you can use 25% loss if that makes you happy. At 15% though, your crank figures are:
241.5 HP / 312.4 TQ
(205.3 @ wheels Div by .85 (15% loss) = 241.5)
You can do a "coast down" measurement on a Dyno Jet dyno so that you can pin-point the driveline loss if you really want to know what it is.
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mb
Dodge Dakota
JOIN HERE
6/23/2003
13:14:26
| RE: Dyno results for 4.7L
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Called a pal of mine at a Dyno jet shop. He said "18-20% coast-down loss on most pickups."
So split the diff between your original 25% and my 15%, then go w/ 20%.
205.3 RWHP Divide by .80 (20% loss) = 256.6 crank HP
265.6 RWTQ Divide by .80 = 332 crank TQ
Whats stock rating? 240 HP / 300 TQ?
Good numbers.
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FLDak
Dodge Dakota
JOIN HERE
6/23/2003
13:45:00
| RE: Dyno results for 4.7L
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Message:
Thanks for the replys!!
CThomp: Yeah I was surprised also. I left the stock IAT in place and bought another IAT to put in the air intake tube, just incase I was not happy with the results. Between dyno runs I simply move the cable from one IAT to the other to see what difference it would make.
mb: Thanks for the help with the math! I was confused about how to get the crank HP. The dyno operator said about 18% driveline loss was normal for an auto. Yes, the stock rating is 235HP/295TQ.
Thanks again!
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mb
Dodge Dakota
JOIN HERE
6/23/2003
14:14:41
| RE: Dyno results for 4.7L
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Message:
No matter how you slice it, those are good numbers for bolt on mods.
205.3 div by .82 (18%) = 250.3
265.6 div by .82 (18%) = 323.9
It is responding well to those mods.
I was a bit thrown when I noticed your original 25% 257 figure was right on the 20% 256.6 figure. We just by chance landed on the same calculation even though we took different routes!
Anyhow, good runner. I bet w/ those 4:10's that it scoots.
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IntenseDak39
*GenIII*
6/23/2003
14:31:51
| RE: Dyno results for 4.7L
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Message:
remember MikeD's dyno run? Turned the IAT Adjuster down to the second to coldest mark and gained 25 wrhp... impressive!! (but he has a very good list of bolt ons)
From the local dyno shops here, i have heard that you should expect about a 13-17% for manuals (less clutches) and 15-20% for automatics.
1998 Regular Cab V6 Auto
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FLDak
Dodge Dakota
JOIN HERE
6/23/2003
14:33:13
| RE: Dyno results for 4.7L
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Message:
mb:
Yeah, RWHP*1.25=crank HP is the same as RWHP/.80=crank HP. The 1.25 number in the first equation is the inverse(1/x button on the calculator) of .80
Just invert and multiply.
Yes, I love my 4.10s! I highly recommend them if you have 3.55s.
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IntenseDak39
*GenIII*
6/23/2003
14:42:53
| RE: Dyno results for 4.7L
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i am getting mine in a couple weeks!!! woo hoo!!
that and a trac lok with my 26" tires should be a whole lotta fun!
1998 Regular Cab V6 Auto
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mb
Dodge Dakota
JOIN HERE
6/23/2003
15:12:55
|  RE: Dyno results for 4.7L
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Message:
I saw your 1.25 as "25%" With my .80 being "20%" So to be the inverse it would have to be .75 to equal 1.25... Confusing enuf!?
No matter, looks like we have a good enough number to be pleased.
Best part anyhow is the post topic. As this real world test on the relocate is 1st rate.
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MikeD
*R/T*
6/23/2003
16:39:01
| RE: Dyno results for 4.7L
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Yeah I was shocked that the little IAT box that everyone said was junk actually jumped me up that much rwhp. But I got the B&G flash so I'm able to run those numbers w/o the IAT box now. I've tried using now w/ the other bolt-ons I've done and it doesn't seem to work as well as it did before...but if u don't have a flash that adds fuel then that box really does work!
~Mike~
Get In...Sit Down...Shutup...& Hangon
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IntenseDak39
*GenIII*
6/24/2003
10:54:53
| RE: Dyno results for 4.7L
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Message:
good deal mike good to hear that your getting the tuning squared away.
btw, do you still have that box and are you gonna sell it? if so, let me know!
thanx
1998 Regular Cab V6 Auto
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Simple
Dodge Dakota
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6/24/2003
13:05:21
| RE: Dyno results for 4.7L
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Message:
You people need to take some basic algrebra courses. sh1t!
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MikeD
*R/T*
6/24/2003
13:48:59
| RE: Dyno results for 4.7L
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Its still spliced in...I'll take a look and see if theres someway I can disconnect it...hell its not even worth selling it if I can get it off there we can meet up sometime and I'll just give it to ya.
~Mike~
Get In...Sit Down...Shutup...& Hangon
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IntenseDak39
*GenIII*
6/24/2003
14:26:43
| RE: Dyno results for 4.7L
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LOL!!
but eigth grade was so hard!!
1998 Regular Cab V6 Auto
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Demon Dakota
DakotaEnthusiast
6/24/2003
16:21:36
| RE: Dyno results for 4.7L
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Would someone mind posting the link for the how to build instructions for the IAT adjuster? I can't find the link, and I need to show my buddy Alan how he can make it for himself. I wish I would have kept my instructions...
K&N Drop in AF (CAI during summer months)
True Dual exhaust and removed third cat
HO Cams & HO Intake
FASTMAN 70mm TB
Autolite 3923 Plugs
TPS @ .76 VDC
IAT Adjuster Mod
14.52@94.2 MPH at Silver Dollar Raceway
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dakotaman4dr
Dodge Dakota
JOIN HERE
6/24/2003
17:55:38
| RE: Dyno results for 4.7L
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Fldak,
Did you have a big MPG loss with the 4.10 gears, and how much higher are your RPM's running with them? Been thinking about swapping from the 3.55's to the 4.10's but wanted to hear what someone else though first.
2001 4.7lt Quad Cab auto 3.55 open dif.
nsperformance air intake w/K&N, magnaflow single in dual out dumped, cutout before the 3rd cat, reflexions cowl hood, Lakewood traction bars
www.dodgetruckworld.com/dakotaman4dr/
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franlofter
Dodge Dakota
JOIN HERE
6/24/2003
23:57:50
| RE: Dyno results for 4.7L
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Message:
One thing I noticed with my Iat in my intake is it makes a noticable difference where I live in AZ 100+ temps, but when i go up north 70s up there feels the same mine should be in the 250HP range at crank, I have pretty much same mods.
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03Dak
Dodge Dakota
JOIN HERE
6/25/2003
00:23:18
| RE: Dyno results for 4.7L
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Message:
I'd like to see where to adjust that IAT as well. But will wait until I make a tube.
franlofter, where do you live in AZ?
I live on the West side (surprise/El Mirage) but work in Central.
I would like to run into some guys locally to see what they got. I haven't seen AZdak post lately either. Hmm???
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franlofter
Dodge Dakota
JOIN HERE
6/25/2003
09:58:05
| RE: Dyno results for 4.7L
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03Dak I live on the west side in peoria 5 min from surprise right next to the 101.
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Simple
Dodge Dakota
JOIN HERE
6/25/2003
09:59:36
| RE: Dyno results for 4.7L
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Message:
I need to take a basic spelling course. sh1t!
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FLDak
Dodge Dakota
JOIN HERE
6/25/2003
10:22:56
| RE: Dyno results for 4.7L
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dakotaman4dr:
The short answer on MPG loss is no.
I'm not blowing you off but go to the link listed below, it has all the info from cost, MPG, to RPMs at different speeds.
http://www.dodgedakota.net/boards/per/7666.html
I strongly recommend the 4.10s and LSD, makes a big differences in performance!
franlofter:
I agree with you on the temp, I forgot to mention the intake air temperature during the dyno was around 98 deg F. and quite humid in Mobile, AL.
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midnightmagic
GenIII
6/25/2003
14:54:00
| RE: Dyno results for 4.7L
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Message:
i ve had my 00 4.7 cc auto with 3.55 rear,dynoed, the mods include air filter right off the tb, with iat in between,the tb is a 65mm that has been ported and cat back magnaflow duals. and the numbers...at 2500ft. and 91.2 deg 4200 rpms when the speedlimiter shut it down 202rwhp, with 286rwtq. im gonna get a 68mm ported tb soon, so hope that helps the numbers.
It's Gumbo night every night with all the rice i cook!
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yates-in-DE
*GenIII*
6/25/2003
19:01:16
| RE: Dyno results for 4.7L
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Message:
The pages for the IAT adjuster are Here.
Later,
Lynn
 Clic the pic
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FLDak
Dodge Dakota
JOIN HERE
6/26/2003
09:46:41
| RE: Dyno results for 4.7L
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Message:
Lynn,
Did you ever look into the UNICHIP? If so could you share that info with us?
Thanks!
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Demon Dakota
DakotaEnthusiast
6/27/2003
11:33:03
| RE: Dyno results for 4.7L
IP: Logged
Message:
Thanks Lynn. I posted it in another thread, but forgot to come back here and update this one...
K&N Drop in AF (CAI during summer months)
True Dual exhaust and removed third cat
HO Cams & HO Intake
FASTMAN 70mm TB
Autolite 3923 Plugs
TPS @ .76 VDC
IAT Adjuster Mod
14.52@94.2 MPH at Silver Dollar Raceway
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R/TBlues
Dodge Dakota
JOIN HERE
6/29/2003
23:27:01
| RE: Dyno results for 4.7L
IP: Logged
Message:
Uuuuh, 1/0.80=1.25
It comes up every time on my calculator.
Very impressive numbers for such a little modification. It would have been nice to have seen the before and after numbers. I think the actual HP numbers for the 4.7L is closer to 250HP. I have suspected all along that the 4.7L actually was producing more HP than the advertised 235 because a stock 4.7L automatic R/C w/3.55's will out run a 5.9L R/T RC w/3.92's just about everytime. It would be hard for the 4.7L to even come close to the 5.9L R/T if it was making less HP than the R/T. Either the 5.9L is making less than 250HP or the 4.7L is making more than 235HP or both. Before I can believe that your modifications actually made any significant increases in your HP I would have to see a before and after mods comparison.
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R/TBlues
Dodge Dakota
JOIN HERE
6/29/2003
23:28:00
| RE: Dyno results for 4.7L
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Message:
Uuuuh, 1/0.80=1.25
It comes up every time on my calculator.
Very impressive numbers for such a little modification. It would have been nice to have seen the before and after numbers. I think the actual HP numbers for the 4.7L is closer to 250HP. I have suspected all along that the 4.7L actually was producing more HP than the advertised 235 because a stock 4.7L automatic R/C w/3.55's will out run a 5.9L R/T RC w/3.92's just about everytime. It would be hard for the 4.7L to even come close to the 5.9L R/T if it was making less HP than the R/T. Either the 5.9L is making less than 250HP or the 4.7L is making more than 235HP or both. Before I can believe that your modifications actually made any significant increases in your HP I would have to see a before and after mods comparison.
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Duner
Dodge Dakota
JOIN HERE
6/29/2003
23:53:44
| Area Under The Curve
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Message:
The PEAK HP number may be lower on the stock 4.7 engine vs the stock 5.9 engine but that doesn't tell the whole story. The 4.7 engine produces it's power over a wider rpm range. This wider rpm range means that there is more "area under the curve". That's a tough concept for alot of people to understand. In reality, peak numbers don't mean much at all.
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Demon Dakota
DakotaEnthusiast
6/30/2003
13:52:55
| RE: Dyno results for 4.7L
IP: Logged
Message:
Thank you Duner! I've been trying to tell people that for months. If you add up all the HP numbers at incremental RPM points on your dyno (whether 4.7 or 5.9), whoever has the most in the end, wins! I'd start at either 2K or 3K RPM...
K&N Drop in AF (CAI during summer months)
True Dual exhaust and removed third cat
HO Cams & HO Intake
FASTMAN 70mm TB
Autolite 3923 Plugs
TPS @ .76 VDC
IAT Adjuster Mod
14.52@94.2 MPH at Silver Dollar Raceway
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