I just gotta ask myself every once in a while "Where do people get this stuff?"
I dont think he is talking about a stock DET, I am not, I am wondering how much
power can be accomplised while using pump gas, in my case 91 octane. And how to get the HP, what mods.... thanks for the reply. I have been doing a lot of research and most of the time people dont say what Gas they are using, I assume race gas for anyone who makes 500 and up and maybe the others with 400 and up too... I aslo understand that a lot of people think that 400 is unattainable with the stock bottom end... and some do... anyways do you know how much HP is attainable with 91 octane gas... using the SR20DET thanks
Opps... here's the setup. I thought it was stock internal but he has 9.0 CR pistons. anyways, ran 12.50@117.18 on street tires and pump gas in his S13.
from a thread on freshalloy:
Redtop SR
CP Pistons - 9.0:1 CR
Stock Rods
Cometic 1.2mm HG
HKS 264 step 2 Cams
HKS valve springs
HKS rocker arm stoppers
Stock Turbo manifold with external WG flange welded on.
Tial 35mm WG
GT25R (.86 A/R) with WG flapper welded shut.
Z32/740/walbro/SSPL ROM Tune.
the setup made 8 psi by 3800 rpm and put down 293hp @ 8 psi.
full power runs were at 18 psi and yeilded 397 Hp actual (378 Hp SAE corrected...very cold morning for florida!!!) and the car made full boost around 4100-4200 RPM. the owner was VERY happy.
oh, the record for a stock bottom end DET is somewhere around 550whp in a 240. Granted, at those levels, who knows how long it'll last
With 91 octance, I'd think 18psi is fairly safe on pump gas.... this is just based on EVOs coming from the factory set with a max boost of 19psi at 3500rpm (which goes down to 16.2 at 6500rpm) according to Sport compact car. And that's with a compression ratio of 8.8:1. So with a lower CR of 8.5, and I'm assuming the combustion chamber of the SR is equally good at preventing detonation as the 4g63, 18psi should be safe.
And with a set of cams and intake manifold, and a properly sized turbo, 350whp should be doable at 18psi I'd think.
Oh, just noticed you're in Cali.... hmm... 16psi at least! I've read your gas sucks ass out there. I know Dave Coleman dyno'd his SCC 240 at 15psi on that Cali gas. Really, I'd still think 18 would be doable even on your crap gas.
Last edited by spdracerUT : Aug 9th, 2004 at 11:16 PM.
How much HP should I expect from 91 octane gasoline? What would be the bext most efficient way to get the most power from pump gas?
Quote:
Originally Posted by spdracerUT
with a DET? maybe 350whp.... maybe... I know of a guy running 93octane and making 380whp.
Quote:
Originally Posted by spdracerUT
P.S. myoung, don't worry, i'm not crazy
Sorry, but no where did he even mention any modifications or any current whp numbers. Without a crystal ball it would be impossible to give him any possible numbers what so ever without knowing something about the car setup. Your 350whp to 380whp quote seemed a bit odd...it also did not have any clarification..... Those numbers seem a bit high for those modifications.
It's not crap gas.. only lower octane than what can be found in other states. 91 is the highest normal pump gas obtainable in CA.
91 octane yes, but the same quality as 91 octane from other places? Just from tons of reading, I've read that the gas in cali is quite inconsistent and just lower quality with regards to knock resistence. I wonder what all additives and stuff they put in your gas over there for emissions and pollution control... well, that's what i've read.....
Sorry, but no where did he even mention any modifications or any current whp numbers. Your 350whp to 380whp quote seemed a bit odd...it also did not have any clarification..... Those numbers seem a bit high for those modifications.
No biggy, I was just taking the more global view on things concerning the car with the specs i listed, was owned by a guy named Jay here in Florida. I've seen it in person at a track event I attending. Pretty sure it was tuned by Secret Services in Tampa. Just based on the 1/4 trap speed, I don't doubt the power. The numbers do seem a bit high to me too, but it's all in the tuning and far you're willing to push the limits. I'm use to numbers from more conservative tuning.
I never mentioned a setup. Well, what I'd do is get the greddy intake manifold, a proper equal length exhaust with a divorced wastegate setup, cams, 3" exhaust minimum, and a properly sized ball bearing turbo (if looking for max power as opposed to boost response, something that's the most efficient at anticipated flowrates and pressure ratios).
That would be after taking care of the reliability stuff of course.
oh, the record for a stock bottom end DET is somewhere around 550whp in a 240. Granted, at those levels, who knows how long it'll last
With 91 octance, I'd think 18psi is fairly safe on pump gas.... this is just based on EVOs coming from the factory set with a max boost of 19psi at 3500rpm (which goes down to 16.2 at 6500rpm) according to Sport compact car. And that's with a compression ratio of 8.8:1. So with a lower CR of 8.5, and I'm assuming the combustion chamber of the SR is equally good at preventing detonation as the 4g63, 18psi should be safe.
And with a set of cams and intake manifold, and a properly sized turbo, 350whp should be doable at 18psi I'd think.
Oh, just noticed you're in Cali.... hmm... 16psi at least! I've read your gas sucks ass out there. I know Dave Coleman dyno'd his SCC 240 at 15psi on that Cali gas. Really, I'd still think 18 would be doable even on your crap gas.
Our gas is really bad and the SR is more prone to detonate than the 4G63. About 15-18 is the max depending on the turbo's backpressure.
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91 octane yes, but the same quality as 91 octane from other places? Just from tons of reading, I've read that the gas in cali is quite inconsistent and just lower quality with regards to knock resistence. I wonder what all additives and stuff they put in your gas over there for emissions and pollution control... well, that's what i've read.....
I suspect the volitivity of our gas is bad. This is the difference between the motor and research octane rating. The bigger the difference, the greater the propensity to detonate despight the octane.
Our 91 acts like our old 89 octane fuel. It sucks balls.
Mike
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