fordsvtmfl

iTrader: (13)

Ok, this is just a random question...and i promise this is my last thread for awhile But what would be faster?...a Gs300 Turbo or a Gs400/430 with the same HP numbers...(and for the fun of it same Torque as well) I guess its more of a hp/tq curve type of thing. It seems to me that you would get more hp/tq say from 3-5k from the Gs3-T than you would the Gs4xx, but the 4xx would smoke it off the line. Do i have a flaw in my logic?

twojayzee

If they had the same hp and same tq. Both of them had no stereo system...both weighed the same. And your esentially only asking which is a faster setup, a V8 or I6. Theres alot more to it. Size of turbos, or supercharger if they are running FI.

Now say you have a GS3 na-t with 270ish rwhp on boost vs a stock 02' GS430 with 270ish rwhp (315 crank). I can speak to this since I have a friend with a na-t and my wife has a GS430. The 430 left the line like a rocket and pulled about 3 cars right off the bat, then the na-t came up from behind like I hit the brakes. He kept pulling till 80mph when we were almost neck and neck again. He was still pulling and I let off. The 430 is heavier even though the v8 is all aluminum.

fordsvtmfl

iTrader: (13)

yea thats basically what i was asking..thanks 4 the info...thats kinda what i thought would happen...any other stories/opinions?

twojayzee

Im sure that if he was brake boosting or had an AEM or other ems with anti-lag function he would have walked away from me.

JeffTsai

iTrader: (1)

GS4 will get off harder off the line due to the larger displacement and torque off the line. The GS3 will catch it top end because the turbo is forcing air in up top.

That's also how my personal experience even with American V8's go. They will catch me off the line pretty badly, but once the turbo comes online it's all over from that point on.

sam430

iTrader: (10)

Same horse and torque with same weight? THe 6 will beat it because it can rev much quicker.

Rock-a-Lex

iTrader: (4)

There is one huge error in the above...every stock V8 GS has 300hp at the crank not 315hp and there is an approximate 20% loss due to the drivetrain. This equates to around 240whp...if you search old threads in the 2GS perfomance section you will find that MANY with GS400/430 got stock baseline dyno runs ranging from 235-245whp.

So, if your friend had in fact a GS3 na-t then he most likely had that dyno'd at some point for tuning purposes and he probably was at 270ish whp but your stock GS430 was pushing only 245whp MAX. 25whp extra will pull on the highway without a doubt. This is NOT apples to apples. Sorry if I sound like I am coming of as being a jerk just pointing out the reason why your friend caught up to you and started pulling past you at 80mph.

...back to the drawing board!

twojayzee

Gosh you big jerk, you hurt my feelings. I got your huge error right here j/k
Your right. Its 325tq, I was giving it 10more hp than it deserves.
Anyway the na-t was dyno'd. Wow I didnt realize there was that much loss. All the wifes car has is a short ram intake. I certainly didnt think her car is the shiznit or anything like that, shi* only 235-240huh that makes me feel even better not worse. We'll race again when I get my motor built

jcat_350

actually you guys are kind of both wrong....i baselined my stock GS3 (225 crank) and it came out to 170 rwhp. That accounts for a 24% driveline loss. Therefore:

300/1.24= 242 at the wheels. Obviously mileage and engine wear will affect these numbers +/- a couple hp.

But, like jeff said, the added low end grunt of the V8 will get the 6 off the line, but once that turbo spools the 6 is gone due to less weight and much more high end power.

black_gs99

i say it depends on the turbo and where the gs3t's power curve is....seeing that the gs3 is only making 270rwhp hes probably using a very small turbo...or he has a big one and isnt using any boost...but if it is a very small turbo he can probably hit full boost at like 3300rpms maybe less...like in my gs3 i hit 480tq at about 3700rpms and thats with a pretty small turbo...

twojayzee

What size turbo ?

twojayzee

Not disagreeing with you, but not every car has the same parasitic loss thru the drivetrain.

Rock-a-Lex

iTrader: (4)

Perfect response...I couldn't have said it better myself! That's why I gave it a range of 235 - 245whp to play it safe. lol

Just a small note...I got a dyno (on my GS400) of 252whp when I just had an intake, Borla rear section exhaust and TM spark plugs. All of those items may have added 10whp so I was probably around 242whp stock. The small addition of the Apexi Neo jumped the numbers up to 270whp and I just added headers about 2 mos ago. I have to get it re-dyno'd again to see where I'm at now.

GS FONZy

iTrader: (6)

50lbs is not that much different
He said same hp/tq numbers, so how will he have more or higher hp
Like I said before 50lbs won't make a big difference.

The V8 will take it off the line and if they are the same HP, the 300 might catch up top end. So if you drag race in a 1/8 or 1/4 mile track, my money is on the V8, if they truely have same top HP/TQ numbers.

This is not the first time this topic has come up. I was looking for the dyno sheets I used to compare the power band difference between a turbo GS vs larger displacement GS(V8). The GS4xx will reach max torque a lot quicker in lower rpms than a turbo GS. That's ofcourse if they are running a street tuned basic turbo system. Like mentioned before, they could be set up with small turbos and reduce lag, But that won't be as street friendly.

fordsvtmfl

iTrader: (13)

so...whose money would you be on say...rolling from 45-100mph?