Dyno Test

[French TB]

Hi At all,

I put my TB on dyno test next monday, one test with Jet chip st2 and another without chip.
we will know what a is the real power given by this chip!
Made your bets!

Yves.

[blandmiller]

My bet is that the stage II will make slightly less power than the stock PCM.

[French TB]

On the Jet Performance web site, the dyno sheet give from 13 to 21 hp more at the rear wheel. You think that is false?

[ghoster]

I would like to see it tested with the chip, then driven 5000 miles and tested again.:cool:

[French TB]

I have install this chips at 500 km (310 miles). My TB has 100500 km (62410 miles) without problem. In France we have no compagny for tune PCM

[ghoster]

I am not thinking it would have problems. I think the PCM will negate any effects the chip has after its been given enough time to compensate.:cool: I also think those numbers for gains will be a little on the high side, but thats just one persons guess.:)

[blandmiller]

I don't believe that the JetChip is modifying anything but basic transmission parameters. The Dyno numbers they publish do not look anything like any other dyno sheets (Mustang, Superflow, Dynojet) of these vehicles.

And I tend to agree with Ghoster, if they are making any changes to the timing or fueling they are being negated as the PCM detects and corrects for them. If the PCM is correcting the sensor data, it will not behave completely normal immediately after removing the JetChip and relying on the learned PCM parameters alone.

We all have opinions regarding the Jet products, but any dyno information is appreciated. Go for it.

[French TB]

Ok, I think of having understood, I am sorry my English is not good…
Have you a true dyno sheets for stock TB I6?

[French TB]

I am really disappointed!
After install a new catback (JBA) on my TB, I put on dyno test.
I found between 265 and 270 hp! I do not understand anything!
Somebody has a dyno sheet with a stock vehicle?
I put the copy of this test next saturday.
Yves tears...

For Blandmiller,
I make a run without Jet Chip and, You are right, the gain
is of approximately +3hp. I run more km without Jet Chip and put another dyno test.

[Blazernut]

I am really disappointed!
After install a new catback (JBA) on my TB, I put on dyno test.
I found between 265 and 270 hp! I do not understand anything!
Somebody has a dyno sheet with a stock vehicle?
I put the copy of this test next saturday.
Yves tears...

For Blandmiller,
I make a run without Jet Chip and, You are right, the gain
is of approximately +3hp. I run more km without Jet Chip and put another dyno test.

Compare your test to this test and see the difference.

http://i147.photobucket.com/albums/r308/Blazernut/trailblazerdyno.jpg

Alvin sells tuned PCM at PCMforless. Test has I5 posted to it however was labelled wrong.

Notice anything that would be of benefit to you? His tune would take advantage of the rest of your modifications. You stated your HP as 260 - 270? Seems far above stock HP from this dyno sheet or are the measurements taken at different areas?

B. :)

[French TB]

Yes, of memory (I wait the graph sheet for this saturday), the power is between 260 and 270 on 3 run. The power is Iso power not SAE power, but after search on th internet, I think the small difference (1,4%). I found another dyno sheet on K&N web site, and there is difference with Alvin dyno sheet. The SAE like ISO indicate the power with all accesories installed and at the flyweel.
I am not explained the difference between my test and the "stock dyno sheet". I not think what CAI, TB and catback give as much power.
Or then the french bezine is very very very good. At 1.2 Euros per liter what would be normal!!! lol

[Blazernut]

Yes, of memory (I wait the graph sheet for this saturday), the power is between 260 and 270 on 3 run. The power is Iso power not SAE power, but after search on th internet, I think the small difference (1,4%). I found another dyno sheet on K&N web site, and there is difference with Alvin dyno sheet. The SAE like ISO indicate the power with all accesories installed and at the flyweel.
I am not explained the difference between my test and the "stock dyno sheet". I not think what CAI, TB and catback give as much power.
Or then the french bezine is very very very good. At 1.2 Euros per liter what would be normal!!! lol

LOL ... We pay about 1 Canadian buck per litre where I am. (87 octane)

Is that bezine actually benzine? (highly flamable carcinogenic stuff?) Do they put that in all fuel? :undecided

I am very enthusiastic to see your dyno sheets. Did you notice how the "Tuned" PCM delivers smooth horsepower compared to stock.

You must get one for your truck. It is the most credible change you can do for it for less than $200 US dollars. And it may save you a few Euros at the fuel pump :yes: A "Tuned" PCM should make your other modifications perform to the maximum.

If you read the posts on the PCMforless area you will see that they did the dyno runs in second gear for specific reasons. They also describe the type of dyno and why it gets the readings as posted.

Cheers,
Bill

[turbomike]

My stock 02 Envoy on a 95deg day:

217 tq
220 hp

[Blazernut]

Ahh... here's that thread ....

http://forums.trailvoy.com/showthread.php?t=14818&highlight=dyno+results


Hey turbomike .... was your dyno in second gear like Alvin stated in this thread? He ran into a "cat overtemp" situation. In third he said he was at like 140 mph.

Interesting stuff!

B.

[turbomike]

Yes, 2nd gear because of speed limiter in 3rd at about 4500 rpm.

[Blazernut]

Yes, 2nd gear because of speed limiter in 3rd at about 4500 rpm.

Oh ya ... I forgot about the speed limiter on the stock tunes. Good numbers though! And it's a stock I6 ....very nice. Regular fuel?

[ScarabEpic22]

Interesting, I would drive a few hundred more km and then put it back on the dyno.

Also, 265-270hp is at the flywheel, can you get the results at the rear wheels too?

I really want to dyno mine now, especially since I can now do a pull in 3rd b/c I can remove the limiter and with EFILive I should be able to do a pull in stock form, and then again tuned by PCM4Less to see the differences.:D

Now, to find a dyno that doesnt cost an arm and a leg...

[Blazernut]

Interesting, I would drive a few hundred more km and then put it back on the dyno.

Also, 265-270hp is at the flywheel, can you get the results at the rear wheels too?

I really want to dyno mine now, especially since I can now do a pull in 3rd b/c I can remove the limiter and with EFILive I should be able to do a pull in stock form, and then again tuned by PCM4Less to see the differences.:D

Now, to find a dyno that doesnt cost an arm and a leg...

Like Alvin said - With a sustained run in third he got an "overtemp" at the cat. That's why he used second. (140 mph in Third) :eek:

How much does dyno testing run in your area? I think I will phone around here and see what it costs.

[blandmiller]

Turbomike, are those corrected HP/TQ numbers; and if so to what SAE, STD, ISO? How about vehicle specifics: 2WD/4WD, rear gear ratio, ~ fuel octane?

Those are very impressive numbers for a stock LL8. They are higher than my non-stock numbers, and I know what gains I made.

[turbomike]

I can't remember all the details, but it was a fairly hot humid day in Dallas during august. Dyno was a DynoJet, 3.42 diff, 93 octane, removed air filter, and placed IAT sensor in a cup of ice water. I also remember when the exhaust cam was advanced around 4800rpm the hp and tq numbers went up by about 20.

[blandmiller]

Now I feel better. My numbers are in driveable form, 3.73 diff, 4WD, 87 octane pump gas, and without manipulating the sensors or intake filter.

The jump in power around 4800 rpm is not only the exhaust cam "retarding" (yes, it retards not advances), but the PCM goes into open loop fueling and not stoich.

Are the manipulated numbers you stated corrected or raw based on the 95 degree day and no mention of the barometric pressure? Did you happen to have the wideband O2 in the tailpipe to see if the IAT manipulation was doing anything? I bet the IAT mod made it run even more pig rich than normal.

[ScarabEpic22]

Like Alvin said - With a sustained run in third he got an "overtemp" at the cat. That's why he used second. (140 mph in Third) :eek:

How much does dyno testing run in your area? I think I will phone around here and see what it costs.

I bet he did, I think I can smell when my cat goes into overtemp mode, it starts to not be as quick and smells a lot more. Only happens after spirited drives on the freeway + some hard street launches.

Just wish EFILive could turn the cat overheat parameter off, if only for dyno runs... (That way I could make more of a "race" tune with less TM, fastest shifts I can have and make sure it doesnt start pulling fuel when Im in a race or at the track).

I will call around and check about dyno time, wonder if the speedshop near me has one and if they are open next week.

[blandmiller]

Erik, the COT parameter does not pull fuel, it adds fuel to cool the cat and keep it from melting due to the high exhaust temperatures at high engine loading.

I would install and monitor an EGT directly ahead of the cat before disabling or adjusting COT (unless you want to buy a new catalytic converter).

[French TB]

Here finaly the dyno sheet with comment.
http://gallery.trailvoy.com/showfull.php?photo=5322

For this test, we stabilize the engine at 2000rpm, then I accelerate until 4000rpm, I release the accelerator around 3000 rpm then I accelerate has bottom.
The problem is when we release then accelerate has bottom, the transmission shift from gear 3 to gear 2, and at 6200 rpm shift to gear 3. This shift 2 to 3 is recording on test.

The second problem is in gear 3 at 5300 rpm the speed is 200 km/h and the engine cut!!!!

The next dyno test we will do it in gear 2, for the moment, the dyno test is calibrate for gear 3.
The fuel is unlead 85 octane.

Yves.

[blandmiller]

The image is not there.

When on the dyno, move the gear selector to D2 (this will lock the transmission to not shift above second gear). I rev to ~2700 RPM and then press the accelerator to the floor (your actual starting RPM may be different depending on the rear end gear you have). If the transmission downshifts into 1st gear, you need to be at a higher RPM before pressing the accelerator to the floor. Once you have found the RPM that will keep the transmission in second gear when the throttle is pressed to the floor, you should start the dyno recording. Keep the accelerator pressed to the floor until the engine 'cuts' out due to the rev limiter. Do not perform the dyno test in third gear unless you have removed the speed limiter and are not concerned with the AFR being very rich due to COT.

[French TB]

Yes we understood that after the test. the dyno is parameterized
for a recording on the gear 3. We will modify it for recording in gear 2.

For the picture
http://gallery.trailvoy.com/showfull.php?photo=5323

[blandmiller]

What brand and type of dyno are you using? I have never seen anything like that graph. Are the bottom three lines the torque? Why does the dyno care what gear you are in?

[French TB]

on this sheet there are three recording superimposed, bellow there are the three recording of torque in Nm not in ft-lbs
The dyno is ROTRONICS.

[Gearhead2012]

Ok, so...for ****s and giggles, i bought an ebay chip...total was like 18 bucks, so i figured why not. How thinks there's any chance of it actually making any substancial difference? And, on the other hand, who thinks it'll screw things up? Just a thought. I also have a K&N intake, and flowmaster catback, and a throttle body spacer...I'd like to get it dynoed and see what kind of power all that got me...if any.

[French TB]

I finally found how to insert an picture!!!
Here my dyno sheet.http://memimage.cardomain.net/member_images/1/web/2497000-2497999/2497513_25_full.jpg

[Blazernut]

Ok, so...for ****s and giggles, i bought an ebay chip...total was like 18 bucks, so i figured why not. How thinks there's any chance of it actually making any substancial difference? And, on the other hand, who thinks it'll screw things up? Just a thought. I also have a K&N intake, and flowmaster catback, and a throttle body spacer...I'd like to get it dynoed and see what kind of power all that got me...if any.

If you look at Frenchtb, he shows a loss of power with the jet chip. I want to see his gains when he gets a tuned PCM installed.