rotaryextreme

iTrader: (2)

Here is the deal. I dyno tuned my friend's car on stock sequential twin turbo. The car has the following mods:

stock twin turbo running sequential
ported motor with the racing beat street port template
R33 fuel pump
550 cc/min primary and 1300cc/min secondary
HKS twin power
cold air intake
large stock mount IC
downpipe, midpipe, restrictive single tip HKS exhaust

The dynosheet shows the a/f. At some of the runs, the a/f at rpm looks lean like crazy but it's not. The o2 sensor at the tail pipe blows off during the run. The car is still running rich. The boost level is 1.15 kg/cm2 and the intake temp is at 45C measured by power fc.

I believe if I lean it out a little and have him change to a higher flow cat-back exhaust such as the APEX GT, it shouldn't be a problem to break 400rwhp on stock twins. They are just stock, not modified or anything.

I guess it's all about tuning. =) and the best part is I did it with the commander because I forgot to bring my laptop with me. Ha!

Chuck Huang

ttb

stupid question, what is "HKS twin power" ?

awesome numbers.

94RHDFD

iTrader: (3)

Nice job Chuck

Mahjik

iTrader: (1)

http://66.216.67.51/product.asp?0=213&1=276&3=397

pp13bnos

iTrader: (1)

what kinda rpms is that guy spinning that motor to? I notice the 4.5kish rpm dip, but after that, it just seems to rev, and rev. CJ

rotaryextreme

iTrader: (2)

We spinned it to 8000rpm. That dip is there because it's still running sequential! =)

Chuck

Wargasm

So looks like you actually went to about 8150 RPM is that right?

Brian

rotaryextreme

iTrader: (2)

I guess so if you want to be very precise about it. The RPM limit on the power fc was set at 8200 so just before the fuel cut.

Chuck Huang

jdhuegel1

Damn... I'm liking all these numbers! Too bad I've heard so many horror stories about the twins going south when ran like this...

Awesome job!!!

HeX

Be very careful... "BOOM!"

-HeX

rotaryextreme

iTrader: (2)

For one thing, I am the kind of person that wants to learn it the hard way. I don't trust the info floating on the internet until I prove it myself.

If the turbo blows up like that, I will let you know. Just for your info, the car has put down about 8000 miles running at 1.15kg/cm2.

The owner of the car asked me to tune it at 1.35 kg/cm2 when he get the 3 bar map sensor. I know for sure you all want to see the dynosheet of that run. =)

Chuck Huang

RX-8

iTrader: (6)

Great #s, nice job Chuck

GsrSol

Cool deal, now give up your maps

rotaryextreme

iTrader: (2)

I guess you missed something in my post. I did it with a commander that I forgot to bring my laptop with me so I don't have the maps.

This friend of mine lives pretty far from me so when he gets the 3 bar map sensor and we are going on the dyno again, I will get the maps uploaded to the laptop and share it with you guys.

Chuck

HeX

I'm not worried about your turbos going "Boom!", something else. Anyway, good luck with your tuning. BTW, I agree with you about learning the "Hard way", I know it's the best way!

-HeX

rotaryextreme

iTrader: (2)

What's that something else you are referring to? The engine?

Chuck Huang

kwikrx7

Nice numbers Chuck! Just goes to show the stock turbos can put down some numbers with great tuning. I'd imagine the turbos would melt (especially running sequential) at that psi but you've proved that they can withstand some serious heat and power. Impressive! That transition is almost unnoticeable...

r_ed_line53

give it up for TUNING.....

HeX

Yeah, your engine. Lot's of people say your engine feels awesome (it's best) just before it blows. I wonder what you could do with those BNR's? Keep up the good work.

-HeX

pomanferrari

iTrader: (1)

Well, the BNR don't look as good any more b/c they put out 410 rwhp. They are still under my consideration b/c of the upgrades done for reliability (bigger w/g, thermal coating? and general blue printing?)

Wargasm

Chuck,

I added your car to my dyno page.

http://www.catenet.net/dyno.php

Regards,
Brian

gohorns

how much psi is 1.15 kg/cm2 ? hard to beleive those little hitachis blowing out that much power but it must be great. Thanks for sharing your mods/numbers

rx7machine

Great numbers man.

SterlingFD

1.15 kg/cm2 is almost 17psi

Crashunit

Chuck does great work with everything I have seen him produce. From bodykits, to upgraded performance parts, and now tuning. I have never doubted his quality in what he brings to the RX-7 community, so just wanted to give him props again for another achievement .