This is topic What the hell is up with my dyno in forum Tech Talk at Northern California Ford Owners  .


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Posted by Mach 5oh (Member # 9497) on :
 
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My car is cammed, o/r x pipe, explorer intake, 3:73 gears. I dont know the cam, but Im more concerned about the graph, wtf does it look like that? Also dnr had me run my car in 3rd. so the 18x numbers are 3rd gear, the 19x is 4th.

[ January 08, 2012, 03:59 PM: Message edited by: Mach 5oh ]
 
Posted by RONIN (Member # 9987) on :
 
What's your concern ? It looks about where it should be .. How much power did you think you would make?

[ January 08, 2012, 04:10 PM: Message edited by: RONIN ]
 
Posted by Mach 5oh (Member # 9497) on :
 
Look at how jagged the graph is. It put down bone stock 5.0 numbers and it's not bone stock.
 
Posted by 88FOX (Member # 9969) on :
 
a cam is pretty worthless without heads.. a cam on stock heads can make you lose power in some cases maybe thats your problem as far as the hp numbers but yea that graph is pretty choppy.

[ January 08, 2012, 04:46 PM: Message edited by: 88FOX ]
 
Posted by WrenchMonkey (Member # 9529) on :
 
Need an A/F Printout if you got it.
 
Posted by Blind (Member # 3052) on :
 
most dyno graphs have smoothing on the charts, that looks like a raw output.

and it looks like your setup really does not like whatever cam is in there, torque is -super- low.
 
Posted by Mach 5oh (Member # 9497) on :
 
Unfortunately no a/f was used. And I'm not sure but I don't think everyone elses graph from the dyne day looked like that. if anybody else were there today tell me if yours is like this also

[ January 08, 2012, 05:40 PM: Message edited by: Mach 5oh ]
 
Posted by 2BlueGeeTees (Member # 4702) on :
 
Graph does look odd but the numbers seem right
 
Posted by Stangn5oh (Member # 10875) on :
 
My buddy and i went to dnr last month in our 5.0's

My number in my 89 were 218hp 297trq in 3rd gear
Rebuilt 302 bored to 306 but not built, 3:73, edelbrock performer upper n lower, 75mm mass, 24lbs inj,

my buddys 92 has a similar set up to mine with a ecam
216hp & 265 i think

My graph looked alot smoother, and your numbers are really low, i think a previous owner put a lincoln town car 5.0 motor in your car, check plug & wires, air/fuel ratio.

Did u drive your car on the dyno if so what exactly did you do.
 
Posted by Secnd2nun64 (Member # 1431) on :
 
That graph looks like you were dropping spark as the rpm increased. might be time for a tune up. cap & new wires, plugs. maybe step up to a msd box and blaster coils.
 
Posted by Stangn5oh (Member # 10875) on :
 
quote:
Originally posted by Secnd2nun64:
That graph looks like you were dropping spark as the rpm increased. might be time for a tune up. cap & new wires, plugs. maybe step up to a msd box and blaster coils.
What he said
 
Posted by Mach 5oh (Member # 9497) on :
 
I think I need another lower distributor base. Mine is missing a clip I'm thinking maybe it's vibrating and causing the bouncy ignition. I also have a video tho of my 4th gear pull and I was blowing out black smoke on the top end and it was making a weird noise
 
Posted by Mach 5oh (Member # 9497) on :
 
http://www.youtube.com/index?desktop_uri=%2F&gl=US#/watch?v=XM4mcjtS_Rc
 
Posted by copcar (Member # 10113) on :
 
In my experience, a graph like that is nearly always either one or a combination of the following...

1) bad connection at the pick up or a damaged pickup.
2) signal arcing at the pickup - poor quality plug wires can cause this
3) burnt plug wire/wires arcing to the block
4) broken spark plug porcelain... have seen this first hand.
5) failing aftermarket ignition. Usually a bad ground in this case.


Really, any ignition malfunction can create a repeatable result.

I'm sure there are other reasons but in my experience these were the most common.
 
Posted by SLOWFOX (Member # 11067) on :
 
Yea my set up is similar to your mach5oh I got bcam,bbk ssi intake,70mmtb,cold air intake,373s,bbk equal length shorties to pypes o/r xpipe to flowmaster super 40s my car has a timing issue where I think my valves float or something but it still manage to put down 216hp and 260trq but my graph is cleaner n better looking lol...

[ January 09, 2012, 09:24 AM: Message edited by: SLOWFOX ]
 
Posted by MauriSSio (Member # 9943) on :
 
quote:
Originally posted by SLOWFOX:
Yea my set up is similar to your mach5oh I got bcam,bbk ssi intake,70mmtb,cold air intake,373s,bbk equal length shorties to pypes o/r xpipe to flowmaster super 40s my car has a timing issue where I think my valves float or something but it still manage to put down 216hp and 260trq but my graph is cleaner n better looking lol...
usually a dyno in higher gears(4th vs 3rd) SHOULD give you higher and more accurate numbers AND a smoother graph. If you dyno in too high a gear (like an overdrive gear, or over 160mphs or so) though you MIGHT show lower numbers at the top though because the rear will be eating up some more hp with the heat it generates.

if you have a 4 speed auto you dyno in 3rd.

5 or 6 speed manual you dyno in 4th.

basically try to dyno in the transmission gear closest to 1:1 ratio

steep gears can also cause wavy graphs.

not saying thats the answer to your problems though. It could very well be the distributor as you mentioned.
 
Posted by Mach 5oh (Member # 9497) on :
 
im gonnna start with the ignition components. i think its that base. gonna get one from pick n pull. hey just curious does a 4v motors maf (like from a mark 8 or continental fwd since they have 24# pounds injectors) work on a 94-95 with 24#s? Im thinking about getting the injectors and maf from one of those.
 
Posted by Blind (Member # 3052) on :
 
quote:
Originally posted by Mach 5oh:
im gonnna start with the ignition components. i think its that base. gonna get one from pick n pull. hey just curious does a 4v motors maf (like from a mark 8 or continental fwd since they have 24# pounds injectors) work on a 94-95 with 24#s? Im thinking about getting the injectors and maf from one of those.
not without a tune.
 
Posted by Mach 5oh (Member # 9497) on :
 
Fuuuuggg
 
Posted by stangrus95 (Member # 10653) on :
 
I went there also my graph came out a lot smoother but when I got tuned n dynoed I was showed n told 275rwhp and 321rwtq
And dnr show me 254rwhp and 285rwtq in 3rd
I was upset, I don't think its right either man
 
Posted by NEIGHT (Member # 8741) on :
 
Holy shit that's choppy get that fixed ASAP. I'm 100% stock with speed density N clogged up cats N put down 189rwhp 267tq on the same dyno as you. Something aint right with your motor kuz it doesn't put much down.
 
Posted by Mach 5oh (Member # 9497) on :
 
I just put on a new lower distributor base, rotor, and cap....waiting on some money so I can get the rest of my tune up shit. need plugs, oil, air filter cleaner, etc etc. then i''ll put it back together and hope i get more seat of the pants, then I'll re-dyno.
 
Posted by Mach 5oh (Member # 9497) on :
 
Hopefully this issue isnt anything toooo serious. I'm hoping doing this stuff and installing a fuel pump will bring me back.
 
Posted by copcar (Member # 10113) on :
 
I'm confused as to why the vehicle would be dynoed in third. Was that requested by someone?
 
Posted by Secnd2nun64 (Member # 1431) on :
 
I recommend getting some new spark plugs wires, a hotter coil and MSD box. there are usually some used MSD boxes in the ford sale section. $50/$60 for a 6A or 6AL. get the coil and plug wires new online. none of that cheap kragen/autozone stuff. taylor thundervolts or msd wires. they are not that badly priced. probably no worse $ wise than what you paid to get the dyno done.
 
Posted by MauriSSio (Member # 9943) on :
 
quote:
Originally posted by copcar:
I'm confused as to why the vehicle would be dynoed in third. Was that requested by someone?
check out the new years dyno day thread in the events section and youll see why.......
 
Posted by copcar (Member # 10113) on :
 
Weird... I have only dynoed customers cars in different gears to check afr for tunes on ECUs with gear select specific timing retard. Basically each gear had it's own tune. I think the guys were running an AEM ecu... Import stuff. I kind-of understand though. Less load on the engine in 3rd than 4th. May have saved some "on the dyno" failures due to bad tunes. You never know what is going to show up on a dyno day.

[ January 12, 2012, 05:10 PM: Message edited by: copcar ]
 
Posted by Mach 5oh (Member # 9497) on :
 
My wires are currently less than a year old, its not really in the budget to replace what works right now.
 
Posted by SAV SVT (Member # 7848) on :
 
quote:
Originally posted by Mach 5oh:
Unfortunately no a/f was used. And I'm not sure but I don't think everyone elses graph from the dyne day looked like that. if anybody else were there today tell me if yours is like this also
Yea I was there, but my dyno graph was smooth all the way up. I was sitting in your trunk when you made that 4th gear pull and there was hella black smoke coming out I though it was gonna go. I think doing the pull in 4th is a lot of stress on your car it took a while for you to get to redline. I remember when my cobra was stock it would take for ever to get to redline. 3rd seem to be a lot less stress full on your car. No smoke at least. I cant get that youtube link to work [Confused] just brings me to the youtube main page. Ill see if I can post a pic of my graph.
 
Posted by MauriSSio (Member # 9943) on :
 
quote:
Originally posted by SAV SVT:
quote:
Originally posted by Mach 5oh:
Unfortunately no a/f was used. And I'm not sure but I don't think everyone elses graph from the dyne day looked like that. if anybody else were there today tell me if yours is like this also
Yea I was there, but my dyno graph was smooth all the way up. I was sitting in your trunk when you made that 4th gear pull and there was hella black smoke coming out I though it was gonna go. I think doing the pull in 4th is a lot of stress on your car it took a while for you to get to redline. I remember when my cobra was stock it would take for ever to get to redline. 3rd seem to be a lot less stress full on your car. No smoke at least. I cant get that youtube link to work [Confused] just brings me to the youtube main page. Ill see if I can post a pic of my graph.
yeah a 4th gear pull with 190rwhp or so would take a while but with 3.73's what is the top speed reached at redline?
 
Posted by Mach 5oh (Member # 9497) on :
 
shit my speedo is off, so i wouldnt be able to tell you.. and yeah my car was strugglin, but im about to install new plugs and test it tonight.
 
Posted by MauriSSio (Member # 9943) on :
 
what size tires are you running and how many rpms do you spin it up to?
 
Posted by Mach 5oh (Member # 9497) on :
 
i got 295's on the back, and i took it all the way up to 6k. I got the plugs in, and it seems to rev alot smoother, I couldnt actually test the car though. I seem to have lost my brakes over the last few days, one of my lines from the booster is leaking, wont hold pressure. gonna replace that tomorrow,and get some driving tests.
 
Posted by Mach 5oh (Member # 9497) on :
 
same shit, it ran REALLY good when I let it warm up for a few minutes, then took it out...then after running for a while it was back to the way it is, just a lil bit better, from the plugs n shit... I did a 4th gear pull on the freeway, and it wasnt smoking black, but it was lightly smoking out grey i'd say. It didnt make the weird noise though.. I think the car really needs a tune now, cause it is a 94 with a cam...I plan on putting some heads on it then tuning it, or maybe a vortech then tuning it, really no point in tuning it with what it has right now.
 
Posted by MauriSSio (Member # 9943) on :
 
your car only saw about 85mph on the dyno. the top of 4th should only see maybe 116mph. The car shouldnt struggle to hit either of those speeds.

Im not 5.0 computer expert but i would think that a cam change would necessitate a new tune, i might be wrong on that though.

grey smoke would probably be equated to bluish smoke. if thats the case maybe you have some bad rings??? i dont think that would cause a wavy dyno though. looks more like its gonna be an ignition thing still.
 
Posted by bayareapits (Member # 4048) on :
 
during their 1st dyno i went,my graph was wavy,so figured i needed a tuneup so i did,cleaned my mass air and put street tires graph was smoother
 
Posted by slocobra (Member # 6311) on :
 
Im curious who pays to dyno with no a/f readings....... what exactly was the whole point? Dyno's are a tuning tool, with no a/f reading, no tuning.
 




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