Want to run 7 psi

[SpeedySolara]

What do I need to run 7psi SAFELY? Any internal work needed?

Please fill me in with as much details as possible such as mods list, recommendations, tips, etc.

[jetbtkng]

bigger injectors, jims fuel mod, safc, bigger fuel pump, the complete obx 3 in exhaust, plasma booster, 100 or better octane fuel, plug wires, meth inj, if you run a 6 psi pully you can 94 octane no need for meth inj, and keep the fuel pump you have, and should be able to get about 270 hp, my black lara gets about 285 hp with 6 psi pully, but you need to upgrade all the other items i mentioned......................

[SpeedySolara]

Thanks for the reply. Adding additional mods is no problem but getting 100 or better octane in NY isn't going to be practical, the most they offer is 93 (for the most part).

[Mr_Chunkz]

Thanks for the reply. Adding additional mods is no problem but getting 100 or better octane in NY isn't going to be practical, the most they offer is 93 (for the most part).

Any boost above 6, your engine will start to knock pretty bad because of heat, especially if you run crappy gas.. The mods that were mentioned by Frank will keep the car stable, but if running high octane fuel or methanol isnt practical for you, the only other consideration is built internals.

[Eye8Pussies]

you don't need 100 octane gas- I can attest to that. Even on 93 octane in the states, my motor ran fine. But I had also tuned it fairly conservatively.


basically all you need is what you listed there already. The more free-flowing the exhaust, the less strain on the motor as well, so again 3" is your best choice, especially for 7psi


the only issue that you must be very wary of is, as tracy said, heat. Although with good gas and safe tuning you'll be fine, bad gas or a hot day that wasn't accounted for in the tune could lead to some disastrous results. In addition, due to the increased heat, going from 6psi to 7psi is not that big of a jump- because the effects of the heat negates the extra air. So, meth injection is pretty much a logical next step that will yield great results.


I have to disagree with tracy though, about getting a built motor. 7 psi on a built motor is pretty much a waste of money.

[Mr_Chunkz]

you don't need 100 octane gas- I can attest to that. Even on 93 octane in the states, my motor ran fine. But I had also tuned it fairly conservatively.


basically all you need is what you listed there already. The more free-flowing the exhaust, the less strain on the motor as well, so again 3" is your best choice, especially for 7psi


the only issue that you must be very wary of is, as tracy said, heat. Although with good gas and safe tuning you'll be fine, bad gas or a hot day that wasn't accounted for in the tune could lead to some disastrous results. In addition, due to the increased heat, going from 6psi to 7psi is not that big of a jump- because the effects of the heat negates the extra air. So, meth injection is pretty much a logical next step that will yield great results.


I have to disagree with tracy though, about getting a built motor. 7 psi on a built motor is pretty much a waste of money.

Well, If he was not to run meth or higher octane fuel, and has the engine running hot alot of the time, longevity would be an issue, imo. Getting built internals is a sure fire way not to blow engines like I did lol

[jetbtkng]

7 psi will kill the engine, you need higher octane, i never run anything under 94.3 octane at 6 psi, you can make your own octane boost, thats what i do, xylene is what i use and marvel mystery oil, 1 gallon xylene and 3.5 ounces of marvel to every 7 gallons of 91 octane will equal 94.25 octane, if you can get 93 octane pump gas then 1 gallon of xylene with 9 gallons of 93 , will produce 95.4 octane, and you can run the >>I'm a douche<< out of it at 6 psi, and be good..................

[SpeedySolara]

Considering heat is a major concern, would the TRD thermostat lower the temperature enough to run 7 psi safely? If not, would a CAI with the thermostat be sufficient?

[1gSE]

whats the temp. difference between the TRD and the stock thermostat? I really think the best bet would be meth injection since kit can be bought for under 300 bux, or you can build one even cheaper. Windshield washer fluid isn't expensive and you get the benefits of higher octane along with cooler intake temps.

[Eye8Pussies]

I've gone through a motor as well...but because my motor had over 200K miles on it already. And when it went, it wasn't from detonation, but from wearing down of seals- both from periods of running extremely rich, and periods of running extremely lean while figuring out how to make the blower work properly on my car.


we have 94 octane here (as do you guys) at sunoco and it's all that you'll need. I beat the crap out of my car every time I drive it...people who know me can attest to that.....and 7psi holds just fine. There may be small knock, but your knock sensors will account for that. Though, by the same token, the ambient air temperature- and as a result, engine temps- are not what they are either here in Toronto or New York as you guys have it in Cali. In addition, our air also contains A LOT more moisture than the air in cali. As such, we get knock inhibiting properties simply from that environmental factor as well.


The age of experimentation for our stock blocks are in a new age. A couple years ago, the consensus for the most "safe" boost you can run on a stock engine was 5.5psi on pump gas. And as such, many people stuck to that, and 6psi was not the norm. Now we know that we can do 7 psi easily. And on pump gas as well.

I personally will be going to 8psi as soon as I figure out if the pulley that I have sitting around is an 8psi pulley or not (or if I can get my hands on one). But with that, meth injection would be a must for the heat- I just have to get around to installing my kit. I'm going to see how far I can push the stock block (within reason) and see how long it can last.

A built motor would be nice, but unless I'm shooting for 500+whp, it's not worth the money. I can swap in 6 or 7 stock motors and push 300+whp out of each of them for a year each for the same amount. And to be frank, I'm tired of this high powered fwd stuff.

[Eye8Pussies]

Considering heat is a major concern, would the TRD thermostat lower the temperature enough to run 7 psi safely? If not, would a CAI with the thermostat be sufficient?

a trd thermostat won't do anything, though it could make the ecu run the car a bit richer since the ect sensor will then read cooler.


the heat that we are talking about is air intake temperature + heat created from the blower pushing the air (due to the spinning of the rotors) that causes predetonation

[Eye8Pussies]

whats the temp. difference between the TRD and the stock thermostat? I really think the best bet would be meth injection since kit can be bought for under 300 bux, or you can build one even cheaper. Windshield washer fluid isn't expensive and you get the benefits of higher octane along with cooler intake temps.

stock is 180F, TRD is 160F, and you can get off the shelf lower-temp ones at 170F


and that's basically the theory behind the meth injection!

well worth the money for what you get.

[SpeedySolara]

Ok so meth injection it is. King, dont you have an advantage over my fuel system since ur running the return fuel line and a 255 fuel pump? Speaking of fuel pumps, i just installed the 190 fuel pump, would i need a bigger one for 7psi?

[ASG14]

Dickhead, I pulled you a Gen 3 return style fuel line from the yard today.

[SpeedySolara]

Dickhead, I pulled you a Gen 3 return style fuel line from the yard today.

Thank you. Would I need a bigger fuel pump though (to run 7 psi that is). It would suck if I do because we JUST freakin installed it not even a week ago and I haven't even driven the car much because of the tires.