I have to start with BIG UPS to Frank and Suzanne Hill at Hill's Garage in Elkridge, MD! I am biased but the best Z shop on the East Coast.

So I finally got the headers installed and nitrous tune cleaned up. All tuning done on a Dyno dynamics dyno but different tuner. The earlier numbers were on a dyno that was 8-9 years old and the current #'s are on a newer dyno.

I think it was more of the tuner because I was only expecting a 15-20 whp gain if I was lucky but 40whp...I'll take it! Gained 33 whp on my NA tune also. Needless to say...Frank Hill is a beast!

 

details on the car and mods? besides headers and nitrous

 

wow, congrats!

 

2007 HR Base Model

As far as what's going to add HP:
Headers
150 Shot of Direct Port Nitrous
Motordyne TDX2 Exhaust
Injen Long Tubes

 

nice,... congrats. Those are pretty good numbers

 

Nice gains.

Would have been interesting to see a pre-dyno on the new system vs their old dyno.

You rev to 8k when na?
Dont like how the lines dont cross at 52## rpm

 

What do you mean don't like how the lines don't cross? And I don't rev to 8k normally the shop did and it made power all the way to 7.5k so mind as well see where it drops off at.

 

hp and tq are supposed to cross at 5225 or 5250...rpm due to math. Weird that yours cross at different points even though the axis are right.

Did the dyno pull an rpm signal from injector?

 

Honestly I'm not sure. I'm in Iowa and the shop sent that to me so I wasn't there when they were tuning the car. I'll have more details Saturday when I pick the car up and Sunday is the shops car show so I'll be getting vids then.

 

I just said the same thing...some guys have it others don't when it comes to tuning !

Awesome...hit the strip!

 

+1

 

the equation is
HP = Torque x RPM ÷ 5252

Looks like your graph is
HP = Torque x RPM ÷ 4750

Which causes inflated HP numbers by about 10%

Just something you should get checked.

 

So if I go by your numbers you are saying my car made less horsepower with long tube headers? I highly doubt that. So I lost 3hp in my N/A tune and about 4-5 hp in my Nitrous tune by going with LTH? Now that doesn't make sense at all.

Or are you saying my gains are inflated by 10% so I only got 36 whp in my nitrous tune vs 40 whp?

If the latter of the two are correct I'd still say pretty damn good tuner and gains.

 

the latter

 

Good gains. I definitely need ppe long tubes. Lol still waiting for the price to go down

 

Is the nitrous on a progressive? It comes in very soft for such a big kit.

 

idk. that doesn't look right. since the dyno actually only reads torque and uses this formula to find horse power hp = rpm x ftlbs/5252

one horse's power is the equivalent of lifting 550 pounds one foot in one second or 33,000 lb-ft/min."

multipy torque in pounds-feet by speed in RPM and divide by 5,252 (the constant, which is 33,000 divided by 2pi, to convert to a rotational value).

so basically, when the RPMs hit 5252 they cancel each other (5252/5252 = 1) and HP = Torque

which is why hp and tq cross at the intersection. either some is wrong with the dyno, it is using another formula to derive how much power you're making, or the graph was adjust behind the scale to fit the power curve in neatly. go to another dyno and have it check. it it's different, then go to a 3rd. i know sounds like it can get pricey, but your graph just looks out of place.

 

It make no sense to compare HP from DIFFERENT dynos & from DIFFERENT times, conditions ????

I don't get why TOP H.P. is at 6,000 something RPM & starts dropping at 7,000 RPM +or - ???

You have an HR engine. A lightly modified N/A HR Z starts making top H.P. at about 6,500 RPM + and goes up PAST 7,500 RPM with the PEAK H.P. / Highest H.P. at apx. 7,500 RPM.

That's the case with 90%+ N/A ONLY, lightly modified H.R. cars.

When I see HR dyno charts with H.P curves where top H.P is in the 6k to 7k range of an HR car, I feel like WTF ?????

 

Response from the tuner himself...

"The reason the horsepower and torque does not cross at 5250 rpm is that we are generating our RPM signal from the roller of the Dyno and not a true tach signal. I have recently purchased the tach adapter option but have not been able to get it to work yet. The horsepower and torque numbers seem to match the local dynoJet brand dynos pretty closely so I'm really not worried about the accuracy. That is what dynodynamics converts the numbers to under the brand X name you see on the Dyno charts. The dynodynamics raw number would be quite a bit lower. Everybody always wants to see Dynojet numbers because they are higher."

Makes sense to me. Nothing wrong with the dyno at all just pulling the RPM signal a different way. Obviously pulling the signal from the roller isn't as accurate as the tach adapter and the tuner acknowledges that.

 

Progressive shot starting at 75 up to 150. Little better on the street and easier on the engine.