nycRedRex

What does it take to run 25 psi on a street ported rebuild motor with 2mm seals? Will the motor hold up if I make sure the A/F readings are below 12.0:1? I haven't heard too much about people running over 18 psi on this forum. Just want to know if people have done it safely and reliably.

joe

Mr rx-7 tt

iTrader: (5)

Race fuel...

ttpowerd

safely and reliably.....I don't think so but I could be wrong. I have heard of low 30's though so I know its possible but I don't know how "reliable" it is.

nocab72

100+ Octane is your new best friend. Water or propane injection may also aid you.

k

carcrazy

I was told on my motor 22 psi was the max you could run. I have RB housings and rotors too!

regards

Rick

AJC13B

VP C16 is your friend

fdracer

you've got rb housing and rotors! jesus man does money grow from the trees in your backyard?

carcrazy

I have two of these trees, they are getting kinda' bare though.

This is the way I "cheat" getting an easy "400+" rwhp out of a stock T04E turbo. Ok ok, so I got some compressor surge to deal with around 2500-3250 rpms. The cool thing is the motor is awesome and idles very nicely - almost like a V8!!! This is what conservative tuning and those rotors and housings can do!

Ask me if it is worth it if you are building a motor and watching the money - probably not a good way to blow $4,000-5,000 on just those mods. The mods were worth only about 20 hp, better durability, and bragging rights - just not worth it looking back maybe. Considering I will need to tear the motor down after 50,000 miles, not that good. However, it does allow you to redline at 9,000 rpms and the motor just runs VERY smooth as it comes with a special counter-weight for the reduced weight of the rotors (shown on the pictures on the web site).

regards

Rick

carcrazy

Here is the picture of the new motor with the counter-weight shown. This comes with the lightened and clipped rotors to off-set the reduced weight of the new rotors.

Racing Beat Counter-weight

Enjoy!

Rick

fdracer

rick,
what kind of apex seals you use on that motor? did you have rb build your motor for you? if not, were the side housings already pre-ported or did you get the blank template and have that ported?

ErnieT

iTrader: (2)

Whoever told ya that was mistaken. You can run as much boost as you want as long as you have the fuel for it. (within reason). I have stock reman and ran as much as 27lbs with no ill effects. I run 20lbs on the track all the time with no ill effects. When Demetrios ports my motor this winter, I'll run 28lbs all the time on the track with no ill effects. Its all in tuning and having enough fuel, proper timing, and the proper A/F ratio.

fdracer

i think he's talking about pump gas. in ca that's only 91 octane.

ErnieT

iTrader: (2)

Pump gas is a totally different subject. I don't run anymore than 15psi on pump. Some people go more, but I don't like to chance it.

carcrazy

The people that built the motor was Redline Engineering in Long Beach area (forget the exact town). Mike is the owner and builder of the motors - awesome guy.

The seals were 2mm Hurley I am fairly sure as it has been a while (over two years now). The reason they did not use 3mm is due to the high revs. They have had better luck with the 2mm at higher revs. The motors specs were this:

1. No positive boost for at least 500 miles.
2. vary the speed of the motor
3. redline is 9k rpm, you can go to 10k in racing situations, if you hit 11k - BOOMIE!!!
4. 22 psi max boost
5. rebuild after 50k miles as the rotors and housings are expensive - no ****!

that is it! With conservative and awesome tuning from X S Engineering, I am getting 403rwhp at 1 bar of boost running a stock T04E (stock from their HKS kit).

regards

Rick

tk5dan

Is 15 psi the most you should go on 91 octane? What happens if you went to like 18 psi, would your engine blow?

Silver Ninety Three

How much boost you can run is all in the tuning. I personally won't run more that 16 psi on 93 octane pump gas. Some people run as much as 18psi and get away with it, but for me it is not worth it. What is your fuel system set up like? Your going to need at least 1600cc seccondaries and a high flowing fuel pump for 25 psi.

carcrazy

Yes, 15 psi is the most you should run with 91 octane. Unless you include water injection, this is a safe limit.

regards

Rick