Dyno results - I'm rich *****!!!

[Anaconda]

Dyno results - I\'m rich *****!!!

409 RWHP/446 Torque, which is better than what I was predicting. I was guessing 400HP/425TQ. The two results in the 300's are when the car was in 3rd gear. I paid for two pulls in a dyno day, and the guy offered to do in 3rd and 4th, so obviously I let him. Only mods are Corsa catback, smooth tubes, K&Ns, no cats, and an aluminum flywheel. This was just a "before and after" deal to see what I pick up when I start modding it.

Notice how rich I am though. I need a VEC2....

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[99 R/T 10]

Re: Dyno results - I\'m rich *****!!!

I would bet you would pick up 20 HP and TQ by bringing your A/F up to the 12-13 range. You're right, Vec 2!

 

[Mike Adams]

Re: Dyno results - I\'m rich *****!!!

Why is it running so rich ?

 

[Russ M]

Re: Dyno results - I\'m rich *****!!!

I bet you were using a tail pipe sniffer, if so that air/fuel number is pointless might as well use your nose to diagnose your air/fuel mixture.

Your numbers are a bit low for having no cats, even on a creampuff I would expect about 415-420 with your mods.

But the reason is that your car was hot lapped 4 times, which will result in low hp. All 4 pulls were made within 3 minutes of each other, had your initial pulls been made in 4th the numbers would be a bit higher.

 

[PRVT JET]

Re: Dyno results - I\'m rich *****!!!

Russ, the tail pipe sniffer is not as bad as you think. My friend had his zr1 with a wideband installed, and the tail pipe sniffer was very close to the wideband reading.

 

[Russ M]

Re: Dyno results - I\'m rich *****!!!

I tested a brand new dyno jet unit up against a Horriba and a Motec unit, the tail pipe was a full point off when it was brand new.

 

[PRVT JET]

Re: Dyno results - I\'m rich *****!!!

Russ, was the dyno jet leaner or richer?

 

[Russ M]

Re: Dyno results - I\'m rich *****!!!

It was all over the place, some times richer sometimes leaner.

All we could think of is that the sniffer just had too slow of a reaction to what was going on. It seemed as if you did the pull long enough the numbers would get a bit closer. But by that time you were finished with the run.

 

[Anaconda]

Re: Dyno results - I\'m rich *****!!!

I tested a brand new dyno jet unit up against a Horriba and a Motec unit, the tail pipe was a full point off when it was brand new.

Well, let's say it is off by a point, hell TWO points.

I am still rich then.....

 

[BlueGTS]

Re: Dyno results - I\'m rich *****!!!

Russ, I think the sniffer you were using was broken. Obviously the tailpipe will lag a few hundred RPM's versus a **** in the collector but other than that they are pretty good. You just have to realize it is farther away from the exhaust valves and adjust your tuning accordingly.

 

[PBJ]

Re: Dyno results - I\'m rich *****!!!

Anaconda,
I just tuned a car the other day with very similar numbers and mods and after the vec2 I ended up with 471 and 505...I thought that was a nice gain for a simple bolt on. There is a lot to be had with the vec 2 and a mild tune.
See ya,
Joe

 

[Anaconda]

Re: Dyno results - I\'m rich *****!!!

Yeah, I will be getting one soon, especially after seeing that dyno chart.

 

[Jack B]

Re: Dyno results - I\'m rich *****!!!

The odds are that the A/F set-up was faulty. You would know if your car was running that rich. The tail-pipe sniffers are accurate if they are the pump style.

 

[diabolos88]

Re: Dyno results - I\'m rich *****!!!

Anaconda,
I just tuned a car the other day with very similar numbers and mods and after the vec2 I ended up with 471 and 505...I thought that was a nice gain for a simple bolt on. There is a lot to be had with the vec 2 and a mild tune.
See ya,
Joe

so jusy the Vec2 alone can add 70hp?

 

[houstonT]

Re: Dyno results - I\'m rich *****!!!

You are 100% correct. We've done many tests to see what effect putting the wideband in the tailpipe vs putting it in the down-pipe (on a Supra) will have. Here is a pic, as you can see, there is about 400-500 rpm of lag in the reading but putting the wide band in the tail pipe is 100% accurate as far as a/f goes, just lags by 4-500 rpm.
Peter

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Russ, I think the sniffer you were using was broken. Obviously the tailpipe will lag a few hundred RPM's versus a **** in the collector but other than that they are pretty good. You just have to realize it is farther away from the exhaust valves and adjust your tuning accordingly.