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 :)

Where are you going and who are you having tune it?

I believe it's already tuned...he's going to see what kind of power he's got :D

Tuend to 16 already by Steve kan...just going to a local dynojet.

curious to see what #'s will come out...I will be going single in a week or so and it will be a t04r, would like to see similar #'s but mine will probably be lower since I am not running a street ported engine.

Ok, So it's scheduled for 1 today....What other numbers would you guys like to see besides the dyno with AFR?

Ambient Tepm
Intake Temp
EGT
Injector Duty Cycle

??

All of the above... boost - of course - and what type of gas.

Yes. boost will be there. I will try and record the boost on the DEFI link and do a play back to record by video or something geeky like that.

I decided I am just going to do the pulls with 93 and watch the AFR. I doubt I will go get racegas to piddle around town so may as well get the numbers on what fuel I will run normally.

Little on the rich side....But i'm still alive.
 

So anyway,
Here goes.

93 Octane
Ambient Temp: 53F

Did 3 runs...
Run 1 (not graphed)
Comments: Had some huge amount of smoke coming out the exhaust and around the compressor housing after the pull...Then it just burned off afer about 10 seconds...So there's an oil leak somewhere...I thought maybe it was the oil line sitting on top that was leaking before...But I sealed it and no oil there...Kinda looks like where the compressor housing connects in the rear...Right around the center....Don't know what you call that..

Run 1 Boost Gauge Video
Run 1 EGT Video

Run 2
PSI: 13
Water Temp: 84c
IDC: 77%
Intake Temp: 24C
Knock: 19
Comments: Same shit again with the smoke...Not as bad as the first time but still smoked.

Run 2 Boost Gauge Video
Run 2 EGT Video


Run 3
PSI: 16
Water Temp: 80c
IDC: 88%
Intake Temp: 21C
Knock: 23
Comments: Same shit again with the smoke...Not as bad as the second time and smoked from the turbo burned off almost instantly. But it still fucking smoked! I think I am going to pick up the HKS Twin Power and go for a retune. 400 is the goal..Once I hit that I am happy..


Run 3 Boost Gauge Video
Run 3 EGT Video



So Questions
1. What could be causing this oil leak?
2. I noticed my boost fluctuate slightly...what's yours like?....Take a look at the videos and tell me if this is bad or what the deal is.



https://www.rx7club.com/attachment.p...id=86030&stc=1

and why am I so lumpy up top? I didn't have any ignition breakup and plugs are new.

EDIT: I'm lumpy everywhere!

When you go WOT, Oil pressure tends to peak, and then settle down, a little better venting may well solve your problem. This is assuming a -10, or a -12 return with no or very slight bends, if you are not straight out of the turbo, that could be it. With those AFRs, and that knock, why not crank it up to at least 20 psi? What gas were you using? Looks like mid 400s S/B no problem. What is your complete ignition consist of? The twin power is a mediocre solution generrally speaking. 3 MSD6A, with the right plugs, and wires should do it. At the boost you are running the ignition is not that much of a problem, past ~20 psi, you really will see a huge benefit. I'd say, looks good, iron out the bugs, and try 20, and 25 psi on race gas. AFRs look just right, although you could be a little leaner even though that rich spot is peak torque. What sort of timing? Good job,Carl

You might be missfiring from running so rich. The AFRs are between 10 and 10.5 from 4700rpm and up.

ya, the car was tuned just a little rich since most areas of Oklahoma has 91 octane. I think 400rwhp is possible with the tune leaner to 11.0:1. a/f looks pretty flat from what I can tell, not bad for street tune :)

Imma see what guitarjunkie locked my afr's in at. Conservative I know, but what is the best for 91 octane? (t78)

Running 93 octane

I'm running 2 greddy race plugs in the leadingg and new NgK wires.

Why I didn't crank it up? we were having ignition breakup at high RPM during tuning past 16psi...Just didn't want past that till I got some ignition amp.

I don't blame you, but keep in mind you can reduce break up by leaning out the afrs a bit. How much advance are you running at 15psi around the torque peak?

16 degrees advance timing with 14 degrees split....

Looks like the EGT is pretty cold, it can definately lean out a bit for sure.

Steve, only bass ackwards OKC has 91 ...everyone here in Tulsa everyone has 93 :D

Ok, help explain this to a dumb ass....Why on run 3 which is the higher HP higher boost run the EGT is cooler than the lower HP run at 13psi?

The 13psi run is 1250 and 16psi almost hist 1200...

:scratch:

Is it because of the tune and it's actually richer up top for the 16psi run?

You gained 50rwhp from 13psi to 16psi? I would tune a litte leaner if it was mine...do you have the numerical pages as opposed to the graphs? On the graph when it bottoms out a 10:1, you don't know how rich you really are going...where as the numerical sheets would still register...but regardless, I would go for 10.5:1 up to 11.5:1 throughout the power band. I did on my 60-1 and it came out very clean...no breakup, smooth graphs, etc...I would guess your fuel situation is causing the roughness on your graph. My tune was at 12-13psi....I am now running 16psi, so I would be curious to know if that is the normal expected power increase with boost levels.

How do you like the way she feels on the street? dyno numbers really don't mean shit....but it's fun to know.

I did that for years and made some timming adjutments.

Yep, It was 331 at 13psi and 381 at 16psi...I have read on here that with each PSI you gain about 15rwhp...So this is close. But closer to 17hp/psi...

I will go see Steve at the begining of the year with a new trailing coil and hks tp and tune to 17. Maybe with a little leaner I will crack 400...

As for on the street. It's pretty amazing actually....Nice power delivery and holds steady and strong till redline...Personally I thought the spool would be a little quicker for this turbo...I get 10psi by about 3800rpm and then by about 4600 full 16psi...Maybe the older style manifold. Don't know.

Anyway, if anyone sees the boost gauge vids...Can you tell me what could be causing the flutter of the needle..It seems to fluctuate and bounce a little..

Does anyone elses do that?

Dou you have the dyno sheet on the win jet file? I would like to compare it to other's.

No, but i can ask for it.

>>...Personally I thought the spool would be a little quicker for this turbo...

yeah, it should.... that may change with a better af tune. With that turbo it should not take to 3800 rpm to get 10 psi. That thing should spin like a mofo.

you positive there are no exhuast leaks on any of the turbo or wg connections.... a small exhuast leak may cause a fluxuation like that,.... i know that my track cars boost would flutter a bit when I had gasket leaks.