Got some Dyno numbers....thoughts???

[Mr Jones 4.6]

Its been awhile since I got the car dyno'd but when it was put on the dyno to be tuned the numbers were around 238rwhp and around 268rwtq on a Mustang Dyno. The #'s just seemed really low to me. I know I have been told that numbers dont mean anything it is how it runs and times it produces, but still for all the stuff done to it I assumed it would make some where in the high 280's for rwhp.

Maybe Im wrong, here is a list of mods on the car at the time of the dyno pull........

Forged -3cc pistons
Forged I-beam rods
Cast crank
Teksid Block
Brand new stock PI heads
Comp XE262AH cams (timed too)
BBK Equal length shorty headers
Pypes off-road X-pipe
Borla XR-1 Catback
JLT Ram-air
BBK 75mm TB w/ Prof. Prod. Upper plenum
MSD coil packs w/ Ford Racing plug wires
NGK TR55 Plugs
4.10 gears
Stock auto tranny & TC plus BC-Automotive valvebody

......and the SCT X-Cal2 tune is a 93 octane with 20 degrees of timing, not sure what the air fuel ratio was (cant find the dyno sheet right now).


I am just trying to figure out what the deal, or am I setting my hopes too high? I have not had a chance to run it at the track but when I get on it while cruising the damn just lights the tires up between 1st & 2nd and 2nd & 3rd shifts ( which I love...heheheh).

Since the dyno I have added an MSD ignition box (whatever the number is) and plugs are gapped at .056

Any bit of advice or help would make me feel better.

Unless you guys think it maybe the auto tranny throwing off the numbers, also the tall gears too.

Thanks guys

:new_year:

 

[AaRoN]

That does seem pretty low.

 

[lethal2v]

Your gears dont affect your horsepower so forget about that one.

With the mods you have i think thats prob fairly close. I would of thought closer to 250 or so. Get some longtube headers instead of your shorties and port and polish those heads. Also, i didnt see...what is your compression at?

 

[Petek]

Your gears dont affect your horsepower so forget about that one.

With the mods you have i think thats prob fairly close. I would of thought closer to 250 or so. Get some longtube headers instead of your shorties and port and polish those heads. Also, i didnt see...what is your compression at?

Gears DO affect Hp, rather common knowledge i thought.

But your numbers do seem low. PI swap, and a good set of cams should see 250ish rwhp.

 

[AaRoN]

Your gears dont affect your horsepower so forget about that one.

With the mods you have i think thats prob fairly close. I would of thought closer to 250 or so. Get some longtube headers instead of your shorties and port and polish those heads. Also, i didnt see...what is your compression at?

Gears DO affect Hp, rather common knowledge i thought.

But your numbers do seem low. PI swap, and a good set of cams should see 250ish rwhp.

YUP!

I've seen a sn95 with a full exhaust, VT cams and a pi swap at almost 290 to the wheels. (I think he had a few other bolt ons as well) But he pretty much had the mods the OP does.

 

[trav_19]

gears do affect it ...it puts your motor into a band faster before it shifts throwing off stuff there is a correction somewhere i believe ...what gear are you running?

 

[Lightning Struck]

I think you guys missed a key point in his post, he put out almost 240rwhp on a MUSTANG DYNO not a Dyno Jet. I dont think his numbers are bad at all, for what he has. Thats nothing special really, he has a nice solid bottom end, but other than that nothing fancy to make big numbers. Stock PI heads, mild 262 grind cams no mention of a AFTERMARKET intake so I assume hes using the stock PI one. All of that PLUS this is a automatic car............so all together I think that near 240 on a mustang dyno isint too bad. That would be in the 270-280 range on a dyno jet I think.

 

[trav_19]

oh i missed the mustang dyno thingy....but regardless i believe i was told gears throw off your numbers

 

[Lightning Struck]

oh i missed the mustang dyno thingy....but regardless i believe i was told gears throw off your numbers

Yes, ..........I want to say it was on SVTP or maybe stangnet that had a HUGE ass write up about it and all kinds of formulas and math to figure the loss from gear changes. But yea it does have a impact on the final numbers.

 

[AaRoN]

Gears throw it off like 2-3hp.

 

[lethal2v]

Hows that? I thought gears had nothing to do with hp. Just acceleration.

 

[lethal2v]

Isnt it the same amount of horsepower, the dyno just reads it different because it assumes stock gearing?

 

[IceMan]

Well... you have an auto trany... that will rob some power... also it all depends on the tune... what was the A/F ratio??? maybe if you lean it a bit it will make more power... add timing... ask your tuner about it???

 

[Lightning Struck]

Well... you have an auto trany... that will rob some power... also it all depends on the tune... what was the A/F ratio??? maybe if you lean it a bit it will make more power... add timing... ask your tuner about it???

hes got 20* of timing now, I think thats pretty high for a .46 isint it????

I know about 14 is the norm for L's

 

[AaRoN]

Well... you have an auto trany... that will rob some power... also it all depends on the tune... what was the A/F ratio??? maybe if you lean it a bit it will make more power... add timing... ask your tuner about it???

hes got 20* of timing now, I think thats pretty high for a .46 isint it????

I know about 14 is the norm for L's

Yeah that seems pretty high.

 

[AaRoN]

Hows that? I thought gears had nothing to do with hp. Just acceleration.

More work for the drivetrain. It robs power but completely makes up for it.

 

[Mr Jones 4.6]

Well I appreciate it guys, yall's answers made me feel alot better about my numbers. I am happy now with the numbers I made compared to what I have done.

What is the average amount of timing for a mustang because mine is 20 degrees with around 11.5:1 c/r.

I was just wondering all this because I am going back to the tuner on monday so i will get another print out of the dyno run and find out what the sir/fuel is.

Im going to look at running the car o Jan. 25th at the track, so I am a little nervous to see what all my money has paid off with.

Thanks

 

[SnakedMark8]

Lightning Struck is giving you good info. The Mustang dyno will give you a 10 - 12 percent lower result than any Dyno Jet. When I was in San Diego, CA I used to tune for JBA Racing. We would have dyno days all the time. Some of the guys right after their tuning session would run down the road to The Dyno Shop, about 10 miles away and have them make a couple pulls on the Dyno Jet dyno to see the higher numbers. They did this because they wanted a good tune and the dyno at JBA was a Dynamic Dyno, similar to a Mustang dyno, so they would get the good tune and then run to the other shop to get the higher numbers on a print out so they could post them up.

Also he's correct in the fact that you don't have anything really special that would produce higher numbers. Now for the gearing, they should have locked the trans in 3rd gear and the TC when they made your pulls. If it was done in any other gear then you numbers will be off. The rear gears have nothing to do with hp. Also, an auto trans will rob you anywhere from 30 - 60 hp depending on the type of trans and condition.

If you are actually running 11 plus compression your timing of 20 is pretty close also. I've been able to get more in some vehicles and then in others less. You can't just say because one vehicle runs 24 that all the others with the same combination should run it also.

 

[Mr Jones 4.6]

Thanks guys. I really appreciate yall's input it reassured me alot more with what im making.

The next things I have lined up are

1) Circle-D Tranny w/ 3k stall TC
2) 100 shot nitrous
3) Sticky Tires

Those should get me easily my low 12 second ride, then I can still drive it everyday with out changing anything internal.

I choose nitrous b/c to my knowledge Nitrous LOVES high compression.

Again, Thanks Guys