Dyno Bhp /g-tech Power Anyone?

[rydning]

I was out did some test with the G-tech this evening/night

I live above the artic circle so we have midnight sun at this time of the year :-) and its nice to drive after 12 in the evening with the sun shining from the sea.And almost no trafic.

Did a lot of test in the 2nd gear and got from 347-352 rwhp at 1.49 dropping to 1.42 bar of boost at max rpm.

Almost flat powercurve from 4500-7300rpm with max at 6300rpm.

Got the max torque at 4500rpm, need to be in 3rd to get max torque belowe 4000rpm.

With a outside temp of 15celcius and sea level with normal pressure this reading are pretty much at ISO.

If the temp drops to 5C and hige humidity the power levels increase easily with 15-20 bhp.

This test was done at 100%flat roads with very good calibrations and accurate input data.

So if its 18% drivetrain loss (gearbox and rollingresistance) I have 426bhp at the flywheel.

18% is what I have heared earlier and sounds to be ok?? 12%gearbox loss +6% rollingloss.

Does any have dynoed this cars so you know the drivetrainloss?

Any with more dyno nr or G-tech or other test equipment?

Edited July 7, 2007 by rydning

[Artie]

rynding,

I dyno'd with WC 330 hp chip. I made 274hp at the wheels and 275lb ft of torque. With a 15% driveline loss this equates to about 325engine/crank HP(almost spot on for the chip) was a humid day(80%) and decent Temp 77F.

Artie

[rydning]

rynding,

I dyno'd with WC 330 hp chip. I made 274hp at the wheels and 275lb ft of torque. With a 15% driveline loss this equates to about 325engine/crank HP(almost spot on for the chip) was a humid day(80%) and decent Temp 77F.

Artie

How much boost did you have?

Well i did see 1,05bar in the other tread.

How is the dyno?rolling road or on the hubs?

Are you able to mesure drivetrain loss?

Edited July 7, 2007 by rydning

[Artie]

How much boost did you have?

Well i did see 1,05bar in the other tread.

How is the dyno?rolling road or on the hubs?

Are you able to mesure drivetrain loss?

it's what you guys call a rolling road I believe. Drive the car onto a large in floor drum, the car accelerates the drum at a rate and the dyno figures HP.. I have no way to measure driveline loss, it's always an estimate. I don't know of any way to measure it besides brake dyno'ing the engine before installing then dyno'ing the car again and measure the difference.

Artie

[Jonathan]

18% on a rolling road for me.

[Artie]

so 18% is pretty standard driveline loss for the Esprit?

Artie

[Jonathan]

Thinking about it a % doesn't make sense.

You might get a small % increase due to torque reaction (and oil resistance ?) but I was losing about 46bhp from mine @ 258bhp.

I guess it would also change depending on what wheels you have as well...I know the Saturns weigh more than the standard wheels I had on the rolling road so that might have tipped slightly since then.

Still, that 350 odd BHP from the engine is very good

[rydning]

Thinking about it a % doesn't make sense.

You might get a small % increase due to torque reaction (and oil resistance ?) but I was losing about 46bhp from mine @ 258bhp.

I guess it would also change depending on what wheels you have as well...I know the Saturns weigh more than the standard wheels I had on the rolling road so that might have tipped slightly since then.

Still, that 350 odd BHP from the engine is very good

Ye,the percentage is not consistent.I have find out that the %loss is decreasing when you increase hp with the same drivetrain.But the loss in bhp is increasing also but not as much as if we use a fixed %.

If I have 350bhp in the ground = 426bhp at the flywheel and if its 18% then I loose 77bhp in drivetrain loss.

So if my gearbox loss is 12%=51bhp=37,5kw witch is enough energy to heat up 3-4 houses in the winter here.....

Food for thoughts???

And this is the thing I try to find out in this tread.+ nice info about what other Esprit owners have messured of BHP.

Was it 258bhp at the rearwheel on a rolling?

More people with more BHP nr?

Edited July 7, 2007 by rydning

[98GT3]

More people with more nr?

Excuse my ignorance, but what is nr????

Phil

98GT3

[rydning]

Excuse my ignorance, but what is nr????

Phil

98GT3

BHP nr? Brake Horse Power numbers in a dyno or with other messuring equipment.

[98GT3]

BHP nr? Brake Horse Power numbers in a dyno or with other messuring equipment.

Ahh! we write as "No" here, sorry about the confusion! I am looking to get a performance meter of some kind soon-ish.

Phil

98GT3

[Artie]

Thinking about it a % doesn't make sense.

You might get a small % increase due to torque reaction (and oil resistance ?) but I was losing about 46bhp from mine @ 258bhp.

I guess it would also change depending on what wheels you have as well...I know the Saturns weigh more than the standard wheels I had on the rolling road so that might have tipped slightly since then.

Still, that 350 odd BHP from the engine is very good

Here in the states it's a general rule that standard transmissions(5/6 speed manual transmissions) are about 15% driveline loss. Auto's usually are about 20% loss. and transaxles seem to be about 17-18%. I am going to the dyno in the AM, the car is running much better, pulls much better at upper RPM's. Rynding, what did you experience HP wise for each PSI of boost. In other words did you dyno/gtech at 18psi, 19psi, 20psi etc and measure the difference in HP at these levels of boost. Engines/turbos seem to produce a fairly consistent HP per PSI of boost. My RX7 generates about 18 hp at the wheels for each PSI boost, once a baseline is established.

Artie

[rydning]

Here in the states it's a general rule that standard transmissions(5/6 speed manual transmissions) are about 15% driveline loss. Auto's usually are about 20% loss. and transaxles seem to be about 17-18%. I am going to the dyno in the AM, the car is running much better, pulls much better at upper RPM's. Rynding, what did you experience HP wise for each PSI of boost. In other words did you dyno/gtech at 18psi, 19psi, 20psi etc and measure the difference in HP at these levels of boost. Engines/turbos seem to produce a fairly consistent HP per PSI of boost. My RX7 generates about 18 hp at the wheels for each PSI boost, once a baseline is established.

Artie

Yep,the bhp is going up consistent with the boost as long as the backpressure (before the turinewheel) is going parallel to the boost.This is only at lower boost settings I think.You get caught of other issues when running 2,5-4 bar boost.

So on your car with 274 rwBHP at 1.05 bar: 274hp/2.05bar absolut pressure=133,6hp with 0-boost (this is a teoretical No)

133,6hp x 2.36 bar (1.36bar overboost/20psi)=315rwBHP in that dyno.If other thing is unchanged.

If the backpressure beginn to increase more than the boost the BHP tend to stagnate and you reach a point where you dont get more bhp,only heat and this will destroy your engine.

When i talk about absolute pressure is because we live in 1,0bar (at sea level)+boost= absolute pressure.

[Artie]

yes, I do worry about my exhaust restricting flow at these higher boost levels. I am running a WC Stage 1 turbo and some folks have made 330wheel HP with a similar setup. I understand perfectly the absolute pressure(1bar = 14.7psi at sea level) and since the stock system max's at 2.07bar I'm close to the ECM's max limit. I live at 1,023 feet above sea level so I have a little room to play with. I monitor freescan each pull and watch the MAT's and the knock counts. If I see knock counts starting to jump I'll shut it down. My goal is to get 1.2 bar of boost since I wasn't before, so I suspect the additional .15bar will net me around 35-40hp at the wheels. I'll be happy if she marks the territory above the 300 mark! I'll also bring a bag of ice and a pressurized garden sprayer to spray on the CC heat exchanger to keep the MAT's as low as possible. I may make a couple of pulls at 1.25 bar and then see if I can squeeze out 1.3 without problem. If the 1.25 boost pulls give me good numbers then I may forgo this in fear of blowing something up. I'm running a stock ECM with a WC 330 hp chip.

Artie

[rydning]

yes, I do worry about my exhaust restricting flow at these higher boost levels. I am running a WC Stage 1 turbo and some folks have made 330wheel HP with a similar setup. I understand perfectly the absolute pressure(1bar = 14.7psi at sea level) and since the stock system max's at 2.07bar I'm close to the ECM's max limit. I live at 1,023 feet above sea level so I have a little room to play with. I monitor freescan each pull and watch the MAT's and the knock counts. If I see knock counts starting to jump I'll shut it down. My goal is to get 1.2 bar of boost since I wasn't before, so I suspect the additional .15bar will net me around 35-40hp at the wheels. I'll be happy if she marks the territory above the 300 mark! I'll also bring a bag of ice and a pressurized garden sprayer to spray on the CC heat exchanger to keep the MAT's as low as possible. I may make a couple of pulls at 1.25 bar and then see if I can squeeze out 1.3 without problem. If the 1.25 boost pulls give me good numbers then I may forgo this in fear of blowing something up. I'm running a stock ECM with a WC 330 hp chip.

Artie

I think you only get 20bhp on the dyno raising the boost 0.15 bar.If possible.

And if that WC stage 1 turbo is like Garrett stage 1 hybrid 1,2 bar of boost is pretty much max as this turbos are rated to max 350bhp.

It might be that you already are at the limit of that turbo and thats why you cant get more boost.

You need a bigger turbo lol.I had the stage 3 turbo from MJM and if you limit your self to 1,35 bar you will get it to last.Mine blew after sustained use at 1.45bar

Did you do more dyno work?

[Artie]

I think you only get 20bhp on the dyno raising the boost 0.15 bar.If possible.

And if that WC stage 1 turbo is like Garrett stage 1 hybrid 1,2 bar of boost is pretty much max as this turbos are rated to max 350bhp.

It might be that you already are at the limit of that turbo and thats why you cant get more boost.

You need a bigger turbo lol.I had the stage 3 turbo from MJM and if you limit your self to 1,35 bar you will get it to last.Mine blew after sustained use at 1.45bar

Did you do more dyno work?

I see, I think you are right, looked at the compressor maps for the Stage I and I am at about my limit, but I was initially going for a 300 crank hp rating which I already surpassed! Anyway, I am not totally concerned with all out HP if that was my goal I'd have a Toyota Supra with about 1500BHP. I am not having a problem really getting the boost it was peaking and then trailing off, it is staying consistent now, today it was quite hot and humid and with the A/C on she was boosting to 1.27bar in 4th and holding steady(no I didn't run the thing to redline, didn't want to blow my A/C compressor like I did in my RX7). Also, I don't think I'll be shooting for 1.35bar I'll stay conservative maybe max at 1.3 just to see how she handles the fueling. And I did go to the dyno today, but they were closed due to the American 4th of July holiday weekend.... I totally forgot about that, next week I'm tied up with kids, so maybe the week after I'll give it another go! Will bring some liquid CO2 to cool my CC heat exchanger during the run for nice low MAT's!

Artie

[rydning]

Any with more info?

[Artie]

Any with more info?

You're funny, just responded in the other thread.. I was going to dyno again this upcoming Sunday but the weather is going to be too damn hot(High 90's F) so I'm going to wait a few weeks for better cool air. Can't wait to see what she puts down.... Pulls much harder at 1.28bar at 7K rpm vs 1.05bar!!! I bet we're right at 305 hp at the wheels.

Artie

[islandbloke]

Lottie's intermediate owner (me 1990-2002, Gavin 2002-2006, me again last May) did a complete engine overhaul to Garry Kemp specification (although Gav did the work), and he reckons she now puts out 330bhp at the wheels. I have no way of verifying that here (no dyno on the Island) and TBH no real desire to find out...the number doesn't really matter to me. She's been flowed and ported, lightened and balanced, big valves and studs, S300 spec turbo and a race chip, and a free flowing zorst, from memory.

All I can tell you is that she's quick! And LOTS quicker than she was - but I've just got her back from an expensive and lengthy top overhaul (was leaking oil like the Torrey Canyon) and I'm nervous of using the 1.25 bar boost too often, and under strict orders to take it easy for 500 miles until everything beds in. Only other problem is that I think she's over-fuelling - PO did the breather pipe mod and has sealed the petrol tanks, but she smells very petrol-ish if you hoon her.

Now I've got Freescan (although my Vaio laptop isn't a happy host) I'll record a log and let you bright sparks give me some pointers.