This result is from a dynojet with SAE corrected hp. The horsepower in STD was 245whp. We ran out of time on the dyno, the shop was closing and some lady across the street complained about the noise from my car. This was a 4th gear pull with 91 octane.

 

We took it to 10,000rpm, the next step is to upgrade the ignition and due more tuning. We believe the chart is choppy at the top end because my stock 2nd gen coils are reaching their limits. It could also be bad mag sensor readings to the MOTEC, or detonation...... hopefully not.

It makes good power from around 7.5-10k. For those of you that want to do the equation, my O.D. is 23.5", Final drive is 4.875, and 4th gear is 1.
I think we can make 250whp SAE corrected with more tuning and better ignition. We picked up 7whp just from adding some fuel on the top end during the last run, we were way to lean from 8-10k.

I'm only allowed to run 242whp SAE corrected based on my current weight and class rules. I'd like to get the hp up from the 7.5-9k, then taper the timing starting at 9k.
It maybe a few weeks before I make it back to the dyno.

 

What year engine and model?

 

Rx8 e-shaft, RB 89-91 lightened rotors, 2mm ceramic apex seals, 93-95 block.

 

HOW DOES IT HANDLE the big tracks with the str8;s

 

nice

 

Not bad on the straights, I've hit 141mph at Fontana, that is where I struggle the most. There is a corvette C5 ZO6 that runs my class, he is tough to beat when he has a fresh set of tires. Last time I ran a best time of 1:48.9, the Corvette ran a 1:48.3.

I hoping to run a high 1:47 this time out.

 

NRS ceramics? Small bridge as in a 1/2? or just small on every port?

Very nice numbers on that setup, and a sexy looking intake as well! Fun little racer ya got there

 

Thanks

It's a full bridge, just small on every port, or rather (not maxed out compared to what it could be). We new the class wouldn't allow me to run much Hp, so we didn't spend to much time maxing out the ports. I'm fairly sure 250whp will be possible the next time we get on the dyno.

I may switch to a higher race class next year, it would allow me to put in some J-port irons. The next class up would allow me to run around 320whp.

 

I WOULD LIKE TO SEE SOME track vids if you have any?

 

Fontana race part 1 (15 min) http://vimeo.com/5950934
Fontana part 2 (15 min) http://vimeo.com/6001830

Buttonwillow: (short) http://vimeo.com/7075589
Buttonwillow: (short) http://vimeo.com/7075911
Buttonwillow: (short) http://vimeo.com/7076225

These are before my new intake, but everything else is pretty much the same. I was making around 231 whp SAE corrected.

 

Here are some from Mid Ohio in 2008. They are only 1 minute long each.

http://www.streetfire.net/video/3-of...Rx7_190081.htm

http://www.streetfire.net/video/4-of...Rx7_190082.htm

http://www.streetfire.net/video/5-of...Rx7_190083.htm

 

besides spec miata whats the easiest way to get into competition racing?

 

easiest or cheapest? easiest would be to take your car to NASA TT. cheapest would be 24hr Lemon and divide the cost by 4-5 people or just build you a spec miata.

 

I run with NASA, they have a class for just about every car you can think of. I'm running Super Touring 2 race class and the Time Trial S class.

The easiest way is to buy an existing race car with all the correct safety equipment, then join NASA and start running HPDE events. They will issue you a driver book that can be signed off after each event. You will be able to progress from HPDE1, HPDE2, HPDE3, then Time Trial License. Nasa usually will issue a full provisional competition license after getting to HPDE3 and taking a race driving course (driving concepts - 2 day course, depends on region).

I'm die hard rotor head, so I would find an SCCA ITA,ITS,EP rx7, they can usually be found for between 4k - 12k, depending on class and quality. It would be a good setup while you get use to your local tracks and work towards you competition license. All of this can be achieved in one year, all you need is some time and money.
One more thing, when you run in HPDE1 they will assign you an instructor to ride along, so you may want to have a car that has a passenger seat for the first 2 events, until you progress to HPDE2.

 

I donīt want to be ***** but isnīt torque a bit low? While not taking into account that spike, it appears to be about 135 Lb.ft at peak and 125 Lb.ft at max power which corresponds with max power and RPMs. Bridgeport, especially with such nice intake should generate 170+ Lb.ft across the board. Your desired 242 whp should be generated much lower in the powerband.

 

i like this a lot. nice and simple, and i can see the logic there. just out of curiosity, i have two questions:
1. how many miles/hours (not sure how you log it) do you have on the engine?
2. how many rebuilds (in total, but particularly on the ceramics) has it gone through?

it's always a pleasure to see info on your car. keep it up.

 

On other dyno runs we saw around 140-142lb.ft

It does seem low, but it's mainly because the power is made in the high rpm's. I made more torque with the stock 3rd gen manifold, more around the 155lb/ft level, peak hp was 230whp SAE corrected at 8k rpm. I believe I can get torque back to the +150 level with more tuning. I don't think +170 will happen though.

 

I've not had this motor rebuilt yet. This is the first time I've used ceramic seals, The motor has been running in the car since March 2009, about 1 year. I would estimate that we have around 12hrs on the motor. I'm hoping that it lasts through nationals in September, then having it torn down and inspected.

We have a drysump oil system as well, if we can keep oil and water temps at a correct level and keep correct amounts of 2 cycle mix in the fuel, it should last.

I might order the 2 piece e shaft after nationals this year.

Also, I agree with your quote about torque....

 

Pretty Intake work, I like it

 

Something isn't right with your car. My super small streetport made 144ftlbs of TQ.

 

Where is your timming set at? On 91 pump gas I made the most power set at 27*BTDC

 

We're running 26* timing, I think I just need more tuning. I still don't think I'll beable to get much more than 155lb/ft.

 

So it looks like we will be upgrading the ignition this weekend. We will be ditching the stock leading coil, and putting 2 bad *** coils in it's place. Each coil will be helped by 2 msd digital 6 boxes. then hopefully I can get it tuned better next week. It sounds like the guy who usually tunes my car will be able to make it this time.

I will have updates next week.

 

Such advance in bridgeported engine indicates that there must be something what holding your engines VE% back. It seems that your new intake is pushing powerband higher, but exhaust header is tuned for lower range, so we donīt see nor extraordinery high torque, nor such high top end.

Donīt get me wrong, you car is awesome, but stressing engine at 10,000 RPMs when same power can be developed at less than 8,000 RPMs