Cold air intake
Driver
Joined: Nov 2004
Posts: 199
Likes: 1
From: Canada
Every Gs is build a bit different, Some are stronger than others....
I was shocked to see my brand new car dyno at 225, but thats the Truth! The auto tranny eats all the power.... I looked at SRT and their numbers were similar so that is that.
I was shocked to see my brand new car dyno at 225, but thats the Truth! The auto tranny eats all the power.... I looked at SRT and their numbers were similar so that is that.
Lexus Test Driver
Joined: Jun 2002
Posts: 869
Likes: 1
From: California
Originally Posted by Vette Boy
225RWHP is 270HP (20% loss), I thought the 2000 GS400 was stock 300HP 
255RWHP is 306HP (20% loss).
255RWHP is 306HP (20% loss).
270 hp x 20% loss= 216 hp NOT 225
306 hp x 20% loss= 244.8 hp NOT 255
Our cars are rated at 300 hp and assuming APPROXIMATELY 20% loss= 240 hp at the wheels.
I have read and seen numerous dyno runs on this forum that seem to support this as a BALLPARK figure for a stock GS4. Some are a bit lower and some a bit higher due to the numerous variables involved.
Lexus Test Driver
Joined: Jun 2002
Posts: 869
Likes: 1
From: California
Originally Posted by lex400pshR
My numbers are too low???
Look, Here is a dyno from SRT themselves....
Look, Here is a dyno from SRT themselves....
Also, notice that according to the SRT dyno sheet (which I have seen numerous times BTW) that they don't show a 30 hp gain either-more like 22 hp.
This is why I made the statement in my earlier post. Sorry, I am a bit sceptical about claims by aftermarket manufacturers about their products. Nothing personal against SRT though, they make fine products.
Also, the gains on a given dyno on a given car on a day with weather conditions that differ from your own will yield different results.
If you got the numbers you claim, that's great! I hope I do when I install mine too (but I doubt it).
I would be interested in seeing your dyno run printout if you have it. I'm curious to see the power curve before and after...
EDIT: Yes, I know SRT's base numbers are low too. Different dyno's produce different numbers and cannot be reliably compared to runs on another dyno.
Last edited by FutureGS400; Jan 2, 2005 at 05:08 PM.
Driver
Joined: Nov 2004
Posts: 199
Likes: 1
From: Canada
Honestly man, I don't really care about the 20% loss with the tranny... Its just theory
I have seen my car on the dyno 2 times already.... That is the numbers that I got.
Its was at a respected dyno shop and my car was brand new with 5000KM on it when I dyno'd
I wish they where higher, but thats the truth..
SRT dyno is correct... If anyone knows about the Lexus cars its them...
my results were similar so I Support their claim 100%.
Like I said I will dyno my car soon and I will post pix. I will be interested to see your dyno results as well or if anyone else wants to share their dyno...... by all means.
I have seen my car on the dyno 2 times already.... That is the numbers that I got.
Its was at a respected dyno shop and my car was brand new with 5000KM on it when I dyno'd
I wish they where higher, but thats the truth..
SRT dyno is correct... If anyone knows about the Lexus cars its them...
my results were similar so I Support their claim 100%.
Like I said I will dyno my car soon and I will post pix. I will be interested to see your dyno results as well or if anyone else wants to share their dyno...... by all means.
Lexus Test Driver
Joined: Jun 2002
Posts: 869
Likes: 1
From: California
Originally Posted by lex400pshR
One more question......
I know U become faster with the 3.76LSD, but those it make U put out more HP or TQ on the dyno? I've heard the TC does not on the dyno but U can feel it on the street.
thanx,
I know U become faster with the 3.76LSD, but those it make U put out more HP or TQ on the dyno? I've heard the TC does not on the dyno but U can feel it on the street.
thanx,
)I do know from what I've read that the way the car's transmission shifts and the way the TC locks up may affect the peak readings.
I can vouch for the improvement that the two mods make in actual performance even if they don't actually increase the HP output of the engine!
BTW, I didn't mean to imply that I don't believe your numbers. If it came across that way, I apologize. I have an SRT intake myself sitting in the garage waiting to be installed, so I certainly hope to get good numbers (whatever they are) like you did!
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Lexus Test Driver
Joined: Jun 2002
Posts: 869
Likes: 1
From: California
Originally Posted by lex400pshR
Its all good man,
I know U will gain like 30WHP,
But U felt like U gained major power when U put the TC and 3.76LSD?
Like 0.7-0.8 seconds 1/4 mile?
I know U will gain like 30WHP,
But U felt like U gained major power when U put the TC and 3.76LSD?
Like 0.7-0.8 seconds 1/4 mile?
Not sure yet about 1/4 mile times, my best run so far 0-60 was around 5.4 using my Passport G-Timer. I know I can do better-maybe 5.2 or 5.1 Hoping to get around 14.0 or even 13.9 at around 100mph in the 1/4.
Problem now is traction-I can easily smoke both tires from a standstill so I need to practice my launch technique. I'm reluctant to abuse the car in the process however...
If it ever stops raining here, I plan on a drive out to the dragstrip for some official runs!
Guess this is kind of O.T. now...
Pole Position
Joined: Dec 2004
Posts: 212
Likes: 0
From: Illinois
Originally Posted by FutureGS400
...I do know from what I've read that the way the car's transmission shifts and the way the TC locks up may affect the peak readings....
Looser TC will have slightly higher powertrain loss, as will a higher gear.
On a drag strip, there won't be any difference in MPH at the end of the strip, the time will be faster.
Pole Position
Joined: Dec 2004
Posts: 212
Likes: 0
From: Illinois
Originally Posted by lex400pshR
Honestly man, I don't really care about the 20% loss with the tranny... Its just theory
I wish they where higher, but thats the truth..
SRT dyno is correct... If anyone knows about the Lexus cars its them...
my results were similar so I Support their claim 100%.....
SRT dyno is correct... If anyone knows about the Lexus cars its them...
my results were similar so I Support their claim 100%.....
The right way to do this test is interleaved dyno runs switching between between intakes after each run. 6 runs total with 3 runs using each intake (stock and SRT). Then average the numbers and make the results available. When SRT does the test in a manner similar to how an auto manufacturers do it, they will have some credibility....
I'd be shocked if the SRT adds 5 RWHP, that's typical on other cars like GMs LT1/LS1 etc. I can't imagine Lexus is going to leave 30 RWHP on the table.
Driver
Joined: Nov 2004
Posts: 199
Likes: 1
From: Canada
I have done 6 dyno runs in total on two different Occasions.....
There was a 10 mins cool down between runs..
SRT intake comes with a piggy back chip, its the total combination that gives u that 25-30WHP gain... More fuel + more air= More HP
So U can drive like this...hehe
My best time @ the track so far has been 14.9 at 94mph.... So its gonna take a lot to break into 13's..
I'm saying 20% loss is just a figure(theory) like when road and track says stock gs400 will do 14.5 in 1/4 mile which is impossible... since mine with best launch, Brake Rev, Chip + intake + full exhaust busted a 14.9 at best.... so U tell me...
And oh one more thing BTW U can't take the SRT intake + chip in and out like that, it takes a lot of time and once its in, I wouldn't tamper with it,
U can make a stock dyno run, then when U install the kit, do another one, which I did
Anything else would Be Uncivilized lol
There was a 10 mins cool down between runs..
SRT intake comes with a piggy back chip, its the total combination that gives u that 25-30WHP gain... More fuel + more air= More HP
So U can drive like this...hehe
My best time @ the track so far has been 14.9 at 94mph.... So its gonna take a lot to break into 13's..
I'm saying 20% loss is just a figure(theory) like when road and track says stock gs400 will do 14.5 in 1/4 mile which is impossible... since mine with best launch, Brake Rev, Chip + intake + full exhaust busted a 14.9 at best.... so U tell me...
And oh one more thing BTW U can't take the SRT intake + chip in and out like that, it takes a lot of time and once its in, I wouldn't tamper with it,
U can make a stock dyno run, then when U install the kit, do another one, which I did
Anything else would Be Uncivilized lol
Lexus Test Driver
Joined: Jun 2002
Posts: 869
Likes: 1
From: California
Originally Posted by lex400pshR
I have done 6 dyno runs in total on two different Occasions.....
There was a 10 mins cool down between runs..
SRT intake comes with a piggy back chip, its the total combination that gives u that 25-30WHP gain... More fuel + more air= More HP
So U can drive like this...hehe
My best time @ the track so far has been 14.9 at 94mph.... So its gonna take a lot to break into 13's..
I'm saying 20% loss is just a figure(theory) like when road and track says stock gs400 will do 14.5 in 1/4 mile which is impossible... since mine with best launch, Brake Rev, Chip + intake + full exhaust busted a 14.9 at best.... so U tell me...
And oh one more thing BTW U can't take the SRT intake + chip in and out like that, it takes a lot of time and once its in, I wouldn't tamper with it,
U can make a stock dyno run, then when U install the kit, do another one, which I did
Anything else would Be Uncivilized lol
There was a 10 mins cool down between runs..
SRT intake comes with a piggy back chip, its the total combination that gives u that 25-30WHP gain... More fuel + more air= More HP
So U can drive like this...hehe
My best time @ the track so far has been 14.9 at 94mph.... So its gonna take a lot to break into 13's..
I'm saying 20% loss is just a figure(theory) like when road and track says stock gs400 will do 14.5 in 1/4 mile which is impossible... since mine with best launch, Brake Rev, Chip + intake + full exhaust busted a 14.9 at best.... so U tell me...
And oh one more thing BTW U can't take the SRT intake + chip in and out like that, it takes a lot of time and once its in, I wouldn't tamper with it,
U can make a stock dyno run, then when U install the kit, do another one, which I did
Anything else would Be Uncivilized lol
I think Road & Track is pretty reliable when they quote actual times (as opposed to "estimating").
14.5 E.T. sounds like a possibility to me under ideal conditions with an expert behind the wheel.
The 20% drivetrain loss figure is fairly accurate based on historical data from other dyno runs...usually about 230 hp on the low side and 240 or so on the upper end of the scale.
I will try to schedule a dyno run before and after my SRT intake install (and possibly Carson Tuned cat back exhaust) to get some more numbers for the "data base".
Driver
Joined: Nov 2004
Posts: 199
Likes: 1
From: Canada
Trust me, I'm a good Driver!
Gs gave all it had, I had a very good reaction time and the launch was perfect, thats what I got with all my mods, So how can a stock gs without these mods do better?
Theory states that its impossible, hehehehe
BTW when I was at the track I was on the stock 17's chrome with mich/Pilot sport 245's all around, Now i'm on 19's with 275's
Gs gave all it had, I had a very good reaction time and the launch was perfect, thats what I got with all my mods, So how can a stock gs without these mods do better?
Theory states that its impossible, hehehehe
BTW when I was at the track I was on the stock 17's chrome with mich/Pilot sport 245's all around, Now i'm on 19's with 275's
Last edited by lex400pshR; Jan 3, 2005 at 07:51 PM.