Will Dyno My GT35/40 in 2 weeks. Wanna take a stab at what numbers to expect?
 

So I finally got my car back and it's running strong.

On the weekend of the 20th I will finally dyno on a dynojet here in town. Want to see what y'all think it will be...

Will make 2 runs. one at 14psi and one at 16psi..

1/2 tank 93 octane and 1/2 tank 116 octane race gas.


Here's the current mod list.
- Gotham Racing Large Streetport w/3mm Mazda Apex Seals
- Garett GT35/40 Turbo Kit. Down Pipe & Manifold Ceramic Coated
- 45mm Turbosmart Wastegate
- Greddy 2 Row Front Mount Intercooler
- Greddy Elbow
- Greddy Profec B Boost Controler
- Apexi PFC / Commander (Tuned by Steve Kahn)
- Bonez Street/Strip Clutch
- Pettit Down Pipe
- Mid Pipe
- Racing Beat Catback Exhaust
- B&M Short Throw Shifter
- Greddy Race Plugs
- NGK Plug Wires
- Double Throttle / Accelerated Warmup Removed
- Supra Fuel Pump
- Pri Fule Rail Milled w/850cc - Sec Top Feed Rail w/1600cc Injectors
- SX Fuel Pressure Regulator
- 3 Bar Map Sensor
- Eurathane Motor mounts
- 9Lb Racing Beat Flywheel
- RX7.COM Aluminum Oil Cap (i hear this thing adds 15rwhp just from Bling Factor alone)

16 PSI will give ya 420 rwhp. That's my guess.

By the way, you should make your mods list another color other than white. I run the "old style" on the site, so I can't see it!

Please POST the dyno!!!!!

Good call on the white font thing. Here it be.



Here's the current mod list.
- Gotham Racing Large Streetport w/3mm Mazda Apex Seals
- Garett GT35/40 Turbo Kit. Down Pipe & Manifold Ceramic Coated
- 45mm Turbosmart Wastegate
- Greddy 2 Row Front Mount Intercooler
- Greddy Elbow
- Greddy Profec B Boost Controler
- Apexi PFC / Commander (Tuned by Steve Kahn)
- Bonez Street/Strip Clutch
- Pettit Down Pipe
- Mid Pipe
- Racing Beat Catback Exhaust
- B&M Short Throw Shifter
- Greddy Race Plugs
- NGK Plug Wires
- Double Throttle / Accelerated Warmup Removed
- Supra Fuel Pump
- Pri Fule Rail Milled w/850cc - Sec Top Feed Rail w/1600cc Injectors
- SX Fuel Pressure Regulator
- 3 Bar Map Sensor
- Eurathane Motor mounts
- 9Lb Racing Beat Flywheel
- RX7.COM Aluminum Oil Cap (i hear this thing adds 15rwhp just from Bling Factor alone)

holy sh!t that dude's running TWO downpipes!!!! :eek:

Running race gas will lower your hp a little (10-15rwhp) at most but will require you to lean out the a/f ratio to get more hp. If I have to guess, i would say 390-400rwhp@16psi and 365rwhp@14psi. (being optimistic)

That seems a little low to me. Around these parts most guys on stock port engines put out 400 rwhp@15 psi.

but race gas running on a map that is tuned for pump gas will significantly lower the hp #'s. If it was on pump gas, I would guess about the same as what you mentioned.

Yes, it's something new I'm working on. :D

Actually I just forgot to take the stock twins DP off the list :D

Steve, we tuned on Pump gas. How far would you say I can push it safely? (then again, is anyting safe in FI rotary?)

No worries. will be posted here.

Just watch your a/f ratio when making pulls on the dyno. the car was tuned on pump gas so when you put race gas in there, I think your a/f ratio is probably closer to around 10.3:1

Oh, just to post whore a bit more...I thermal wrapped the DP so you can add that to the list :D

I was going to quote the same numbers. That is about what I have seen on the dyno.

Jason

good thing that at least we have something both agreed to.

408.5!!!

We tuned my friends fd to 421 at wheels on a mustang dyno at 15.5 psi....Thats also using a power fc...

this was the closes one to my guess.......I guessed 408.54

Thats right I forgot the oil cap. 409! Just messin. Good luck and let us know how it goes. Sounds like you will have no problems making in the 400's. Why not make a higher psi pull? What ar is your turbo?

You lost me here Steve, why would race gas signifigantly change the AFRs, or the HP? Gasoline, regardless of octane has the potential to make a certain amount of power, the octane refers to the stability of the fuel, not its potential to make power. Help me out here, I think your out there on this one... I have seen AFRs change a couple tenths with race gas, but I've never seen more or less power from the same AFR, race gas VS pump. Where are the engineers when I need them ;). Seriously, can you expand on your comment, Thanks, Carl

415 @ 15 psi 425 @ 16psi

GL man, dont pop the motor now :)

mike

I'm also dynoing my 35/40 set up in 2 weeks.....

Race gas generally has heavier specific weight than pump gas. When you have a higher density fuel atomized with air, your a/f ratio will richen up and lower your hp rating using the same map. That's why you always wanted to tune with the fuel you normally run. Also, like you mentioned, higher octane rating is more stable because it burns slower than pump gas so the potential hp will also decrease due to slower burning process. Generally speaking, for NA cars, you want to run as low of an octane as possible for maximum hp but will also risk a chance of knocking. If you ask any SCCA ITA/spec rx7 racers, they always run 87 octane instead of 91 or 93 because the car runs faster with lower octane.

Thanks for the explanation. So let's say, for safety sake, I want to run C16 to tune, but I plan on running 100 on the track. how much would I "pad" the afr by? In other words, If I want an AFR of 10.8:1 on 100, roughly what would you tune the C16 to 10.4-5? Thanks, Carl

That mainly depending upon the difference in specific weight between the two fuel. Generally speaking, if you tune on C16 for around 10.5:1, you should be fine for most other race gas and pump gas and still be safe. But like I said, the best way to do it is to use whatever gas you plan to run on your car to tune.

It's been two weeks, where's the #'s?

2 weeks ago I was supposed to go and it was raining like a bitch...then I took off to Moscow for a week and now I am back....So tomorrow is the big day :)