Max horsepower safely on 93

[ram150]

Hey, I have been searching tons of different threads trying to see with the mods in my sig if I could add a 10% lower along with LT headers? Or if the 10% is pushing it as far as 93 octane. Im not trying to run e85 or anything else, so I guess as far as horsepower goes my limit would be what 93 can hold. If its not possible to run a 10% lower than I would probably just port the blower. Thanks for any input.

 

[ShelbyGT5HUN]

If you are really going to push the power levels on 93, upgrade the H/E to a good dual fan unit AND core.

 

[MastaAce03]

The majority of people believe 17-18lbs of boost are pushing the limits on 93. There's always those who have went more and are fine. And then those that have blown their motors. I personally have only 92 octane where I live and will be staying at 15-16lbs max on pump gas.

Power depends on each individual set up. You can do 650-680 safely on pump 93 I would say.

At the end of the day, it's just a number. The real question all of us need to ask ourselves is how much power can we actually put to the ground. Especially if you're on the street.

I'm trying to figure out the answer to that question as we speak. A gen2 vmp TVS and Toyo R888 are going on mine this week. Just need the weather around here to cooperate so I can have fun with the new found power. Good luck


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[scotsam]

The real question is how much boost can you run with 93. 18 psi. seems to be the magic number. Last time my car was on a dyno it made 737hp and 667tq on 93 with a 2.9 whipple. I suspect your tvs will do similar on 18psi probably with higher torque.

 

[RedVenom48]

For clarofication are we talking wheel or crank power?

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[ram150]

Thanks for all the replies. I was looking for wheel horsepower, I will be upgrading the H/E as well as injectors if need be. I was looking to push the engine so roughly 18 psi is a good number I guess.

 

[Fang]

Been wondering those same things...

 

[rotor_powerd]

Depends on a lot of things. AFR, ignition timing, and IAT's are going to be most important. I melted 3 pistons out of my car making mid 700's and beating on it on a hot summer night with pump gas. There's no difference between 6-650 horse and 700+ on a street car, no sense in trying to push it to the edge just for a number IMO.

 

[Sirhc7897]

Mine with a Gen2 TVS and 2.4 pulley (full exhaust with ORX, boost a pump, dual fan HE, etc.) put 717/700 to the wheels right at 18psi and was doing that with 127k on the odometer before I traded it in and had been doing that for around 20k miles. Prior to that it was putting down around 600rw through the stock blower for approx. 60k miles...

In hindsight it was a more fun car on the street at 600rw than 700+rw. It was brutally fast at 700+rw obviously but everything had to be just right to use it whereas the 600rw I could almost always play with no worries...

I was on 93 pump gas. I personally don't think I would do an upper and lower on 93 but that's just me...Maybe a 10% and a 2.5 to get it into boost quicker but definitely not with a 2.4 upper...

 

[Ninjak]

In my sig I run a trinity, bps elbow, CJ cai and tb plus longtubes. I have full exhaust, and I run a 2.4 pulley only. I have 93 pump, and I run 13/14 injectors. No boost-a-pump. I am right around 685-690, and it's a blast I have had this setup for quite a while. The tune makes a difference IMO. Bill has always dialed my car in and he did it with run files I sent him from the track and street.

As someone else said, it's better to be safe, and you have to ask just how much power can you put down on the street. I can tell you now, it's hard at the level I am on street tires. On my DR's ok. But those are for the track.

 

[ram150]

In my last post I meant to say "I wasn't looking to push the motor" not push the motor lol. But you guys answered the question no to 10% lower and a 2.4. I'll probably do the BPS elbow the LT headers and maybe port the blower and that is all. I know that the connecting rods are a weak point so maybe replace them.

 

[nxhappy]

Torco is an engine saver. If you push over 17-18 pounds on 93, you NEED to use Torco. I was over 16 lbs and used torco on 91.

If you don't want to use it, and you want more than 18 pounds, you are better off switching to E85 or race gas. 18 pounds is about the limit on 93.

 

[ram150]

So add torco once I fill up with 93 each time ?

 

[Kenneth]

That's what I do.
I use 1 can Torco at every fill up. I usually buy it from VMP by the 5 gallon cans.


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[GT Premi]

There's never a definitive or "right" answer to these threads. They always end up with a whole lot of hearsay and opinions. Take the one above about needing to add Torco if you're running 93 octane @ 19psi. Where did that come from? I'm running 19psi on 93 octane and never use any additives. I've never had an issue. Been running it like this for over 6 years.

With the power level, that, too, just depends. Again, I'm on 19psi with a Whipple 2.9 on my '11 GT500. I estimate it's putting down 660+ at the wheels. Up above, scotsam said he's putting down 737 at 18psi on 93 octane with the same blower. I'd love to know what mods he has.

The general consensus that I've seen over the years, though, is that 750 at the wheels on 93 octane with a Whipple 2.9 is the "safe" limit. I believe a few people have still done more than that on pump gas with the 2.9.

 

[Catmonkey]

There's never a definitive or "right" answer to these threads. They always end up with a whole lot of hearsay and opinions.

Exactly! These cars were made to safely handle the stock output. Anything beyond puts it at risk and that risk goes up incrementally with the more power you make. Sure, only a small percentage of them fail with mods, and no one knows who the unlucky individual will be the next card holder for the BMC. I blew a head gasket in the roughly 675 rwhp range. Not a catastrophic failure, but one that I responded to with a built short block.

 

[nxhappy]

So add torco once I fill up with 93 each time ?

yes, torco is a great additive that will prevent detonation and blown motors. If you are running 16++ pounds you should most certainly add Torco to your pump gas. 18 pounds is the limit on 93 octane. Torco will bump you up to 97-98 octane.

 

[Weather Man]

Threads like this guarantee there will never be a shortage of build threads.

 

[nxhappy]

if you want to run the 10% lower you really need race gas or e85

 

[1st usa car]

In hindsight it was a more fun car on the street at 600rw than 700+rw. It was brutally fast at 700+rw obviously but everything had to be just right to use it whereas the 600rw I could almost always play with no worries...

This actually makes some sense and I can agree because its all about traction and that crazy hit you get from an upgraded blower, tvs included.
I know if i can start hooking up in the earlier gears my car would feel 200whp faster to me -- i would need to wear a diaper.

Agree w/ OP if you do anything just port the blower and if you actually crack open the engine to upgrade the rods... do the cams while you are in there.