brian2906

A couple weeks ago I had JBA ceramic shorty headers installed, before that had made some pulls on the shops Mustang Dyno. I had planned to make more pulls right after the install, but the dyno computer crashed so.... Now that it's fixed I'm hoping to get some runs in soon. (before and after runs on the same dyno are obviously the best) However I had a chance on Sat. at a Mustang Club Dyno day to make some pulls on a Dynojet, and since I had made some runs on a different Dynojet in April.....(Like I said, not the best way to go) check out the results below. Keep in mind that the pull in April was done on a cool day (I didn't make note of the air temp. but I needed a jacket) While Sat. the temp was in the mid 90's with a humidity to match. Also the run they printed out was my 3rd, on the first two runs I went to WOT to fast, and the car downshifted. Also the Dyno operator said that cars were losing 3-5 hp on each back to back run due to the heat. Lastly, both sheets were printed in MPH [:@] But 5252 rpm (where the torque and hp plot crossed) was around 104 mph. My scanner isn't working so this chart will have to do for now. When I get that 2nd run on the shop's Mustang dyno I'll find a way to post the complete graph. (before and after runs on the same dyno)

MPH Stock hp JBA hp
70 153 170
75 162 188
80 179 219
85 195 238
90 209 249
95 223 258
100 242 270
105 253 282
110 262 281
115 269 282
120 274 278
125 276 277

While far from scientific I think the general trend is that the shorty headers do make more power down at lower to mid rpm's/mph. (On my car, your results may vary) Also even though both runs used SAE smoothing of 5 there will be differences, no 2 dynos will read the same. So I wouldn't make any direct comparisons. I hope to make some pulls soon on the shop dyno, and will post results then. For me what I noticed most with the new headers was a much improved sound. The blub..blub...blub.. boat motor sound is gone, replaced with a real nice V8 muscle car sound. Right after Sats. dyno runs I hade several guys ask about the exhaust system, they said it was the best sounding S197 they had heard.
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howarmat

so both of these numbers are from a dynojet or are the stock from the mustang dyno and the JBA from a dynojet?

Simon1

Let the hating begin!! There has been several of us saying the gains are realized in the lower RPMs and not peak. We all know dynos can vary a little bit and theOP admits it. It will be interesting to see the Mustang dyno results.

Howarmat,

He said he used a Dynojet in April and used another Dynojet on Saturday.

brian2906

Sorry for the confusion, both runs are from Dynojet dynos. Just 2 different ones. The shop that installed the headers has a Mustang Dyno, and I made a 'before headers' pull and now I'm waiting to get an 'after header' pull.
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jahudso2

Hey brian, can you please post up the comparison numbers of torque instead of horsepower?

302svt

Subscribing

tonkpils555666sas

I agree... torque would probably tell us more...

brian2906

Sorry for all the delays! I'm having a heck of a time getting in to the shop for a dyno run. They are just swamped I guess. Plus I have my own business to run.

jahudso2

can you post the torque numbers from the previous dyno so we can compare them instead of horsepower? i want to see how flat the torque curve is.

Countersniper

Yeah i'm intersted in the torque results as well.