GS - 2nd Gen (1998-2005) Discussion about the second generation GS300, GS400 and GS430 (1998 - 2005)

Can you read this dyno?

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Old 11-09-06 | 01:34 PM
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Default Can you read this dyno?

Stupid question, but this is confusing - can you interpret the dyno chart on this page http://www.swiftracing.com/vehicles/...take_gs400.htm ?

Which curves (starting at the bottom) represent the stock HP and Torque figures?

I am looking for a stock HP and Torque dyno chart to use as a reference for the dyno I am getting done this week - do you have one that is easier to understand than the one above?
Old 11-09-06 | 01:38 PM
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the bright red is the Stock HP and the Dark Red is the Stock TQ

so max power is 226.4 for the stock gs400 and 235.3 for the torque.

was that what you were asking?
Old 11-09-06 | 02:15 PM
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Originally Posted by mikal
the bright red is the Stock HP and the Dark Red is the Stock TQ

so max power is 226.4 for the stock gs400 and 235.3 for the torque.

was that what you were asking?
Yes, thanks!
Old 11-09-06 | 03:36 PM
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I dynoed my GS400 3 months ago on mustang equipment, see below:

1. 2000 GS400
2.Milage: 88K
3.Engine Oil: Mobile 1 Syn. ( car needed oil change at that time)
4.Trans Fluid: Simple drain and fill, about year before i've dynoed (77K)
5.Heavy 19'' cast wheels
6.Fuel: Regular Premium gas (91 or 93 Oct. can't remeber) no fuel boosters, ect.
7.Exhaust: Completly Stock
8. SRT Intake with K&N cone filter
9.Little *** fan at the front of the car (fan wasn't even pointed towards right side of the car)
10.Closed hood
11.Outside Temp:80's, sunny day

Everything else stock
Total of 3 runs, consistent, third gear pull only
2 of them were at 235WHP
1 was at 234WHP


I can post dyno sheet if you want to......just LMK
- Jake
Old 11-09-06 | 06:51 PM
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Originally Posted by LEXSOOS
I dynoed my GS400 3 months ago on mustang equipment, see below:

1. 2000 GS400
2.Milage: 88K
3.Engine Oil: Mobile 1 Syn. ( car needed oil change at that time)
4.Trans Fluid: Simple drain and fill, about year before i've dynoed (77K)
5.Heavy 19'' cast wheels
6.Fuel: Regular Premium gas (91 or 93 Oct. can't remeber) no fuel boosters, ect.
7.Exhaust: Completly Stock
8. SRT Intake with K&N cone filter
9.Little *** fan at the front of the car (fan wasn't even pointed towards right side of the car)
10.Closed hood
11.Outside Temp:80's, sunny day

Everything else stock
Total of 3 runs, consistent, third gear pull only
2 of them were at 235WHP
1 was at 234WHP


I can post dyno sheet if you want to......just LMK
- Jake
Please post , Always nice to see others charts.
Old 11-09-06 | 07:46 PM
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Good luck Hameed, can't wait to what comes out after the nice work you've done. Make sure you get it on video,like I really need to remind you of that right?
Old 11-09-06 | 08:20 PM
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Here it is:
Attached Files
File Type: pdf
scan0001.pdf (92.1 KB, 182 views)
Old 11-10-06 | 06:02 AM
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Originally Posted by LEXSOOS
Here it is:
You posted SRT with a K&N filter, can I assume you also had the ECU?
Old 11-10-06 | 06:52 AM
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Originally Posted by bluelex
Good luck Hameed, can't wait to what comes out after the nice work you've done. Make sure you get it on video,like I really need to remind you of that right?
Thanks blu, I will record all three runs from different points of the car - one at the back, front and side (just for fun). . I will use my tripod and the video will be big just like the exhaust video you saw before.

I sure hope that there is a difference (read that as in an increase) in power because of the intake and exhaust, otherwise it will be such a letdown !

Appointment is tomorrow afternoon at 1:00 PM. Ambient temperature is supposed to be 50 Fahrenheit (or 10 celsius).
Old 11-10-06 | 05:03 PM
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Originally Posted by GWELEX
You posted SRT with a K&N filter, can I assume you also had the ECU?
Yes, SRT with ECU
Old 11-10-06 | 06:46 PM
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keep in mind though that these Dynos that does not require wheels to be taken off can be fairly inaccurate, can be up to 10% more than real stats
Old 11-10-06 | 07:19 PM
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lexsoos, what was the tq at?
Old 11-11-06 | 11:57 AM
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The dyno was kinda dissappointing......

A couple of reasons:

The shop did not have any experience running a GS400. They specialize in Mustangs.

The guy made me do the runs instead of him - his reasoning being that I knew the car better than him - which is probably true, however I have no experience running a car on a dyno, so that was kinda stupid. If I had known that I would be doing the runs myself, I would have gone elsewhere.

Anyway to cut a long story short I did 3 practice runs and then 3 more and I still didn't know how to apply the correct pressure on the throttle to maximise the hp reading even though I had the gear in M mode and eshift in 3 as advised by Glen.

I still couldn't master the art of applying enough throttle at the right times when accelerating so that it maximized the power.

Anyway, max RWHP was 230 and max TQ was 241 on my final run.

Considering my car is not bone stock at all (other than headers, done every single performance mod short of FI) I should have gotten better numbers.

The video turned out like crap as I had to give it to my son to tape (since I was doing the runs myself). The camcorder was zoomed in and he had not used the camcorder before and didn't know how to zoom out. So the whole video was just showing the rear wheels turning on the dyno.

I think if someone with experience doing this had done the runs, the readings would have been slightly better.

Last edited by Hameed; 11-12-06 at 07:01 AM.
Old 11-11-06 | 12:09 PM
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Here is the dyno chart
Attached Files
File Type: pdf
Hameed_GS400_dyno.pdf (67.6 KB, 509 views)
Old 11-11-06 | 09:30 PM
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Hey why don't you other guys post your engine mods and wheel size ?

And how is SRT getting 13 more HP than anyone else ? With just intake ??????


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