That is incorrect, the tII rotors are heavier then the s6 rotors.
thats why i had mine lightened. They do however have compression of 8.5:1 instead of the s6 9:1. which of course equals more boost

 

Before anyone asks, more boost is not equal to 26 psi ^_^

thewird

 

Just to clarify, the lower compression rotors give the option of running more boost on pump, but yeah 26psi is not a realistic goal.
18psi is what i am hoping to tune for

 

Most serious drag racers consider 87 thru c16 "pump gas" then its meth.... ???

Either way if he has a 8 second drag car then he knows what he is doing...

 

He could also be injecting large amounts of fuel to get the cooling effect. especially if he is injecting further up the intake tract. This would cool the charge more, the injectors being further away is not ideal for a street car, but fine for a drag car.

 

Hmm, that and possibility a liquid intercooler as well. When your talking about dragging it opens up a bunch of possibilities. If you can get the air cold, it might be possible.

thewird

 

Interesting... I expect to be something out the ordinary

 

Lets say I want to run upwards of 18psi on my 62-1..

What supporting mods do I need?

I've got 550/1600 injectors, Aeromotive FPR, Walboro 255lph, Power FC, Profec B series II...FMIC, exhaust, yada yada.

 

Switch the Walboro to a Denso. Install a water or methanol injection system. Possibly upgrade your ignition. Get it tuned. There might be other things but I've been up since yesterday so my mind might not be straight.

thewird

 

Why switch the walbro? I got twin in my tank...

 

I was replying to YoshiFC3S. Walbro's are known to not be reliable. If you have 2 of them there is less of an issue since they aren't being strained as much.

thewird

 

From what I heard is that walbro doesnt like to run dry at all. FD tank is not designed well and chance of pump running dry is higher than in some other vehicles. If you keep at least filled 1/3 of the tank you should be fine.

Source: CJ-motorsports

 

walbros are only unreliable in rx7s and other cars with terrible control of fuel placement inside the tank. keep them wet and they last forever.

 

Honestly, if the guy can keep his intake temps down than why shouldn't he be able to do it???


I'm currently running 18psi on my BNR's. I'm running this boost level all day, every day. I'm seeing consistant intake temps of (on average) 10 degree's above ambient. Granted, I am using A/I in a 50/50 mix of meth and water, however I am not spraying so much that my temps plummet. For a while my A/I kit was malfunctioning and not spraying at all, however my AIT's didn't change in the slightest. I'm spraying just enough water/meth to protect/steam clean my engine under extended periods of boost.

So... if this guy is running 26psi on a single turbo, with VERY good intake temp cooling, why couldn't he do it?

 

With AI its easy, he claims no AI.

theiwrd

 

Yeah, I know.

I should have been more clear. I'm currently running A/I. Shortly after my VMIC was installed the ground for my Aquamist system came off. So I was not running ANY water injection, however I was still showing intake temps of only 10 degrees above ambient. This was while pushing 18psi through my BNRs. The main thing that clued me in to the fact that my A/I was not working was the fact that my reservoir did not need to be refilled.

Now that I *am* running A/I again I have seen no real difference in my AIT's. So what I'm asking is: If he has a very good intercooler setup, why is 26psi on pump gas not possible?

A/I combats pre-ignition, allowing us to run much higher boost than we might normally be afforded. Extremely high intake temps (usually associated with higher boost) and bad fuel cause pre-ignition.

(Hypothetically speaking) If he's running good gas (solid 93+ octane) and has excellent cooling then why can't he push 26psi without A/I??

 

The temperatures in the combustion chamber go up exponentially with increased pressure regardless of intake temps. With AI in the mix, you give something to absorb those temps (water or meth) or increase the octane (meth) to be more resistant to the higher temperature.

thewird

 

Fair play, it hadn't really clicked that that was the case =)