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

Horsepower Estimate

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Old 03-30-05 | 06:02 PM
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Default Horsepower Estimate

Hey CL,

I am curious about what type of horsepower I may have with the few performance mods that I have done. So far I have torquemaster plugs, SRT intake w/chip, and Borla exhaust. I know that stock is 300 hp/310 tq. Using the G-tech timer I averaged 13.9 at 101.9 in the 1/4 mile over 3 runs. The car has had its services done regularly and I have never had any problems with it other than the steering curse which I finally fixed with a new steering rack and aluminum rings. Any ideas or guesses on how much horsepower I can expect to have with my mods. I get asked frequently and I don't want to give inflated numbers. I haven't had the opportunity to dyno yet. Maybe this summer. Any guestimates from the pros are appreciated. Thanks.


KC
Old 03-30-05 | 06:08 PM
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my guesstimate is +30-45 hp
drewgs4 was able to gain 38hp from just the srt intake

and i think some they gained 10hp from the tm plugs
Old 03-30-05 | 06:43 PM
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Originally Posted by T.L.W.

and i think some they gained 10hp from the tm plugs
no sheet? from just plugs
Old 03-30-05 | 07:47 PM
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Originally Posted by kcrawford
Hey CL,

I am curious about what type of horsepower I may have with the few performance mods that I have done. So far I have torquemaster plugs, SRT intake w/chip, and Borla exhaust. I know that stock is 300 hp/310 tq. Using the G-tech timer I averaged 13.9 at 101.9 in the 1/4 mile over 3 runs. The car has had its services done regularly and I have never had any problems with it other than the steering curse which I finally fixed with a new steering rack and aluminum rings. Any ideas or guesses on how much horsepower I can expect to have with my mods. I get asked frequently and I don't want to give inflated numbers. I haven't had the opportunity to dyno yet. Maybe this summer. Any guestimates from the pros are appreciated. Thanks.


KC
KC, I and several other folks have / have had that exact same setup from a performance perspective.

Do you have the newer 'race' ECU?

My GS with exactly the same mods dyno'd between 248 RWHP and 255 rwhp. I've seen others lower by 5- 10 and higher by 5 - 10 depending on how strong their stock engines are.

Chuck, Here is Mean Gene's post on the dyno for the TM plugs btw
https://www.clublexus.com/forums/performance/50745-tm-dyno-results-awesome.html
Old 03-30-05 | 08:49 PM
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Originally Posted by DaveGS4
KC, I and several other folks have / have had that exact same setup from a performance perspective.

Do you have the newer 'race' ECU?

My GS with exactly the same mods dyno'd between 248 RWHP and 255 rwhp. I've seen others lower by 5- 10 and higher by 5 - 10 depending on how strong their stock engines are.

Chuck, Here is Mean Gene's post on the dyno for the TM plugs btw
https://www.clublexus.com/forums/showthread.php?t=50745
Those numbers sound like what you should expect.
Old 03-30-05 | 09:07 PM
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WOW im in the 13's? jesus i knew my car was faster but DAAYYYAAAMMM
Old 03-30-05 | 09:09 PM
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what do you guys think ill be hitting once i get the TC in?
Old 03-30-05 | 09:36 PM
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damn, i don't know about the hp, but under 14 1/4 mile, that's very fast speed we are talking about here... nice job!
Old 03-31-05 | 01:45 AM
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Redgs4 and myself have the TM plugs, he has the FIPK , I have the RMM intake, He has the Tanabe Exhaust, I have the RMM, we both have TC mods, yada, yada, the whole 9 yards.

My car 245 RWHP 250 TQ

Redgs4 242 RWHP 254 TQ


Redgs4 just switched over to the SRT w/ecu. so I'd say it's time for another dyno run.

I myself have slightly more power adder mods coming by the beginning of summer.

Here's the results of our last Dyno Day meet:
Attached Thumbnails Horsepower Estimate-hp-tq-reduced.jpg  
Old 04-01-05 | 01:12 PM
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Thanks DaveGS4 and RMMGS4 for the info. I didn't know there was a new race chip for the intake. I bought mine in 2003 direct from SRT. If there is a newer chip I can get, I'd like to know more about it.

I appreciate the help you guys provide. I got my list of mods right here from the forum. Glad to see others have done the same.

KC
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