GT4202 29psi freeway test
 

Just finished taking a customers car from a previous tune of 21psi and taking it up to 29psi on pump gas (Shell 93). The car is a blast, in the 70-135mph vid it breaks traction from 83 to 100mph then shifts in to 4th at 106. The car is running a AEM and gets in between 25-28 mpg when not totally raging on it. The current tune on the car has about 20hrs in to making very driver friendly and smooth. It also has a multi stage water injection controlled by the AEM. The Vid is in HD so play it on a fast connection/computer or it will glitch.

Sounds beautiful Congrats on the Pump fuel WI tune.

Thanks, especially from you. Ever since I did my T88 at 28psi a few years back and raced it every weekend with out a hiccup, its the only way I will tune on high boost pump gas.

once you get it right you unlock the world of potential for reliable High HP rotaries.

No doubt, with the proper recipe these motors can make ridiculous power on pump gas. My favorite thing to do is pick on crotch rockets who are then in disbelief when you pull away from there liter bikes.

Wow thats awesome! I would love to see some in cars footage. I would also love to use one of those turbos on either of my rotaries but I'm not prepared to put up with the downsides :(

your a bloody chicken. get over your crap turbos and get something serious for once.

You guys need to pick up some vboxes so we can all compare highway speeds. 60-130 etc..

Ya I agree. No turning back once you add some water injection. I'm still down at 22 psi and pull in bikes. They have no idea how to respond.

Very badass

Great video, however, I am very curious to know how the FD feels as it looses traction at the rear at 80 - 100mph. Does it tend to fishtail like it does in second, or is it more stable . I know there are several variables that can influence this such as tire with and suspension setup. I am assuming that you guys are running stock suspension.

I am presently at a little over 500hp but cant say that I have fully experienced these conditions since I have far surpassed the ratings of my clutch.

Nice going man love them pulls

I would guess it would more depend on how much power and what tires like you mentioned above. Mine is unstable when it hits at 36psi on street tires in 4th gear. Will only try it again on drag tires.

It's crazy to see cars pushing 93 octane so far.. Congrats on the results.

The car has the usual suspension mods with a locking diff, I have also tweaked the alignment (no alignment machine just with some simple tools I have made) to make the car very controllable while spinning the tires. It does take some steering correction while it looses traction but very predictable, nothing like the REW T66 1stgen that I built almost 10 years ago which would snap over steer and would not stop spinning till 4th gear. Learning how to control that 1st gen was the best "driving school" for high hp street driving. One thing you have to be prepared for is when the road surface has a joint or changes from concrete to asphalt and vice versa, I have spun tires going over 120 from those conditions.

Also, thank you for the complements guys.

Wow. Wouldn't mind seeing an in-car either. Great sound. Congrats on the tune. Any pics of the car? Love them in white.

I never would of thought that running just aux injection would be enough to boost 25+psi. People always told me aux injection is only good till 21-23psi and from there you would need race gas.

You obviously have success with 29psi. Car is running solid!

I did this years ago now.
Pump fuel Water injection 34psi
703rwhp

How much water are you guys putting in at those boost levels?

Thats crazy

was it pre-turbo injection? and as ^ mentioned, how much water were you using?

It's not generally considered safe. 23ish psi is the supposed limit for WI. After than you're on to meth and/or race fuel.

i have a hard time believing that thing gets anywhere near 28mpg cruising. what kind of advance and afr are you running at cruise? and what MPH?

Not true.

Like rx72c I have a high boost pre turbo WI setup

93 pump petrol
38psi
740rwhp
BW475
TII engine/intake

On 40psi the car has trapped 156mph on the 1/4 mile.

I don't think there would be much more hp to be made on E85 with this setup. I know which is easier to run!


Great vid by the OP!

Absolutely bonkers!!! O_O I'm stuck at 25psi with my preturbo water/method injection due to my twin plate slipping pretty bad (had it on for about 5+ years of hard abuse) whenever I feel like forking over the cash for replacement parts, I'm shooting to max out my gm map sensor on just 93+ water/meth (32ish psi I'm assuming). I will say that with my current setup and before the clutch really started dying I was spinning my 295 r888s at over 70mph before they would hook...now they only spin until about 60mph.

Yep, a lot of people do. The advance and afr all depends on port size, turbo size, compression ratio, and so on. On this car I run a solid 14.9-15.2 during the constant cruse, leaner under the cruse load to 15.7, and richer 13.7 during vacuum acceleration. One thing people also forget about is the TPS Accel modifier tables and how drastically they can change your fuel mileage even when you think you have a steady throttle but your voltage filter is not right. As for my timing, each engine/set up is different. I just tuned a rx8 motor in a 79 1st gen rx7 with a Electromotive TEC GT that got 35 mpg on a round trip. I have been tuning pump gas rotarys for almost ten years, and one thing I have always concentrated on is the reliability, driveability, and the fuel economy of the tune.


Also to the other question, I am running distilled water only in the pre turbo and pre TB locations.