GT3574 dyno plots (A-spec kit)
05-14-09, 04:36 PM
#1
GT3574 dyno plots (A-spec kit)
Just got the car tuned by Dave at KDR (great guy and tuner) and am very happy with the results.
The first attachment is a 3rd gear pull at 16 psi. The second is with the same tune, but a 4th gear pull with creep up to 17 psi. The car seems to have run out of ignition (stock coils, hks twin power and B10EGVs) on the 4th gear pull at close to 500 rwhp. There was very low knock however, and I would have to be going over 130 mph to hit that part of the curve, so I could care less. I am pretty surprised by the significant difference between 3rd and 4th.
Also, the car is hitting about 10 psi around 4k then climbing to 16/17 up to about 7k. Since I have boost creep issues, this is the best I can get it. I would expect that if the boost was controlled better I would have hit max boost earlier and had better lower rpm numbers.
Overall the car is making an impressing 460-500 rwhp and 320-370 ft-lbs on pump gas
.
The first attachment is a 3rd gear pull at 16 psi. The second is with the same tune, but a 4th gear pull with creep up to 17 psi. The car seems to have run out of ignition (stock coils, hks twin power and B10EGVs) on the 4th gear pull at close to 500 rwhp. There was very low knock however, and I would have to be going over 130 mph to hit that part of the curve, so I could care less. I am pretty surprised by the significant difference between 3rd and 4th.
Also, the car is hitting about 10 psi around 4k then climbing to 16/17 up to about 7k. Since I have boost creep issues, this is the best I can get it. I would expect that if the boost was controlled better I would have hit max boost earlier and had better lower rpm numbers.
Overall the car is making an impressing 460-500 rwhp and 320-370 ft-lbs on pump gas
.
05-14-09, 08:20 PM
#7
. He is a great tuner though - he didn't just copy a generic map and tweak it here and there. He spent a good two hours or so meticulously working it from scratch.What was impressive is the turbo put down these numbers continuously. over an over again. The first run hit 17 psi in 3rd and made 470 rwph. This turbo puts it down!
For reference, the previous tune put down 388 rwhp - Dave said the map was just horrible.
That has a lot to do with it I think. The car made great compression (110 psi on front and 114 on rear), but only pulls about 15-16 inHg vacuum. Between that and this power curve, I would say it has some huge ports on it. Puma (forum name) built the engine.
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05-14-09, 08:53 PM
#11
My AEM wideband read about 11.6-11.8 through max RPMs. I was pretty comfortable with that. Also, I turned the boost down about a 1/2 psi after the runs, just to be a little more safe.
Another thing is that we set the fuel cut to 17.5 psi. The 4th gear run hit about 17 psi and stayed below 11.8 AFR (the second run shown with the red line), so I'll hopefully be safe if it does overboost and lean out the AFR.
I'm sure I'm pushing it for pump gas, though. No water or alcohol injection as of now...
Another thing is that we set the fuel cut to 17.5 psi. The 4th gear run hit about 17 psi and stayed below 11.8 AFR (the second run shown with the red line), so I'll hopefully be safe if it does overboost and lean out the AFR.
I'm sure I'm pushing it for pump gas, though
. No water or alcohol injection as of now...
05-14-09, 09:54 PM
#13
Also, the 3rd gear pull is not the final tune. The final run made 458 and the AFRs are slightly lower (below 11 from 7-7.5k and rising to 11.8). The only plot I have of it is cluttered with 3 runs on top of each other so I didn't post it.
05-14-09, 10:20 PM
#14
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Why in gods name did you set fuel cut?! You never set a fuel cut. You set a fuel "dump", where if you run too much boost the ecu is set to go full rich. I guess you can't teach an old dog new tricks. Good luck with your car. Sounds like a nice setup. And I hope your tune was changed up top when you were running 12.0 a/f ratio. On pump gas thats too much heat without AI. You'll warp on detonate the seals.
05-14-09, 10:34 PM
#15
A couple of things to point out. First I want to say good numbers.
These runs were done in STD which means inflated HP number. Most tuners do it in SAE with smoothing set on "5". SAE usually shows about 10HP less depending on temp conditions. Smoothing set to "0" will also inflate the numbers because its not averaging the little spikes in HP you get in the run.
Never tune in 3rd gear. As soon as you do a 4th gear pull on the street or highway you will blow that motor especially with you running close to 12.0 A/F. 4th gear puts a bigger load on the engine and its going to run leaner than doing it in 3rd gear. My advice is figureout the boost issue and retune in 4th.
Also, you are not running out of ignition. We have done over 500HP many times on stock coils and a twin power.
Still good numbers for a 35R.
These runs were done in STD which means inflated HP number. Most tuners do it in SAE with smoothing set on "5". SAE usually shows about 10HP less depending on temp conditions. Smoothing set to "0" will also inflate the numbers because its not averaging the little spikes in HP you get in the run.
Never tune in 3rd gear. As soon as you do a 4th gear pull on the street or highway you will blow that motor especially with you running close to 12.0 A/F. 4th gear puts a bigger load on the engine and its going to run leaner than doing it in 3rd gear. My advice is figureout the boost issue and retune in 4th.
Also, you are not running out of ignition. We have done over 500HP many times on stock coils and a twin power.
Still good numbers for a 35R.
05-14-09, 11:08 PM
#16
5th is most fun
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A couple of things to point out. First I want to say good numbers.
These runs were done in STD which means inflated HP number. Most tuners do it in SAE with smoothing set on "5". SAE usually shows about 10HP less depending on temp conditions. Smoothing set to "0" will also inflate the numbers because its not averaging the little spikes in HP you get in the run.
Never tune in 3rd gear. As soon as you do a 4th gear pull on the street or highway you will blow that motor especially with you running close to 12.0 A/F. 4th gear puts a bigger load on the engine and its going to run leaner than doing it in 3rd gear. My advice is figureout the boost issue and retune in 4th.
Also, you are not running out of ignition. We have done over 500HP many times on stock coils and a twin power.
Still good numbers for a 35R.
These runs were done in STD which means inflated HP number. Most tuners do it in SAE with smoothing set on "5". SAE usually shows about 10HP less depending on temp conditions. Smoothing set to "0" will also inflate the numbers because its not averaging the little spikes in HP you get in the run.
Never tune in 3rd gear. As soon as you do a 4th gear pull on the street or highway you will blow that motor especially with you running close to 12.0 A/F. 4th gear puts a bigger load on the engine and its going to run leaner than doing it in 3rd gear. My advice is figureout the boost issue and retune in 4th.
Also, you are not running out of ignition. We have done over 500HP many times on stock coils and a twin power.
Still good numbers for a 35R.
With reference to the higher load being put on the engine in fourth gear, I would like some info on how this affects tuning. I am a highway guy and enjoy 5th gear, does this mean i need to tune specifically for each gear, does a dyno account for different gears or different speeds rather. I am not trying to hijack the thread but I have heard in the past warnings about max boost on long highway pulls, can someone reccomend some threads, thanks. Great numbers man !!!
05-15-09, 07:08 AM
#18
Why in gods name did you set fuel cut?! You never set a fuel cut. You set a fuel "dump", where if you run too much boost the ecu is set to go full rich. I guess you can't teach an old dog new tricks. Good luck with your car. Sounds like a nice setup. And I hope your tune was changed up top when you were running 12.0 a/f ratio. On pump gas thats too much heat without AI. You'll warp on detonate the seals.
The map that Dave started with had the max boost in the cells set to about 17.5 psi for finer resolution. So Dave and I decided to keep it that way. That left us with little option for how to handle the fuel if the boost spiked other than a fuel cut which Dave said was safe. Is it not?
If the car is too lean, I’ll put some fuel back above 6k just to be safe. I thought high 11’s were ok.
A couple of things to point out. First I want to say good numbers.
These runs were done in STD which means inflated HP number. Most tuners do it in SAE with smoothing set on "5". SAE usually shows about 10HP less depending on temp conditions. Smoothing set to "0" will also inflate the numbers because its not averaging the little spikes in HP you get in the run.
Never tune in 3rd gear. As soon as you do a 4th gear pull on the street or highway you will blow that motor especially with you running close to 12.0 A/F. 4th gear puts a bigger load on the engine and its going to run leaner than doing it in 3rd gear. My advice is figureout the boost issue and retune in 4th.
Also, you are not running out of ignition. We have done over 500HP many times on stock coils and a twin power.
Still good numbers for a 35R.
These runs were done in STD which means inflated HP number. Most tuners do it in SAE with smoothing set on "5". SAE usually shows about 10HP less depending on temp conditions. Smoothing set to "0" will also inflate the numbers because its not averaging the little spikes in HP you get in the run.
Never tune in 3rd gear. As soon as you do a 4th gear pull on the street or highway you will blow that motor especially with you running close to 12.0 A/F. 4th gear puts a bigger load on the engine and its going to run leaner than doing it in 3rd gear. My advice is figureout the boost issue and retune in 4th.
Also, you are not running out of ignition. We have done over 500HP many times on stock coils and a twin power.
Still good numbers for a 35R.
My boost issues are that this set-up with my engine has boost creep issues (44mm Tial). Running on a 10lb wastegate I see 13 psi at redline. To raise it to 15-16 is tricky.
I’m not trying to squeak out every last number from this thing. I would have been just as happy with less hp since the car more than exceeded my goals. I wanted the smoothing set to zero to see if there was any ignition breakup. The numbers were exactly the same (the 500 hp run is shown with smoothing 5). Also, the ambient conditions (shown on the graphs) were 83 deg F and 20% humidity. Not sure how much the numbers would be affected by SAE, but correcting actually increased my numbers on my old car in similar conditions (more humidity though).
Thanks for the advice guys - do you guys think I need to get this thing re-tuned? I was happy with it, but ignorance is bliss I iguess
.
05-15-09, 08:06 AM
#20
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The map that Dave started with had the max boost in the cells set to about 17.5 psi for finer resolution. So Dave and I decided to keep it that way. That left us with little option for how to handle the fuel if the boost spiked other than a fuel cut which Dave said was safe. Is it not?
If the car is too lean, I’ll put some fuel back above 6k just to be safe. I thought high 11’s were ok.
Thanks for the advice guys - do you guys think I need to get this thing re-tuned? I was happy with it, but ignorance is bliss I iguess.
If the car is too lean, I’ll put some fuel back above 6k just to be safe. I thought high 11’s were ok.
Thanks for the advice guys - do you guys think I need to get this thing re-tuned? I was happy with it, but ignorance is bliss I iguess
.No, fuel cut is not safe. For instance, you spike to 18psi and you have fuel cut. That means you running 18lbs of boost with NO FUEL, hense no more motor. I would take it someplace else to have it tuned. I would also invest in an AI setup. You will be much happier in the long run.
05-15-09, 12:48 PM
#23
canadian monster
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just for the record, i did not build the engine, rx7specialities in Calgary did, i just put everything together in the car.
I am surprised with those numbers too, they seem awfully high for that turbo.
I am surprised with those numbers too, they seem awfully high for that turbo.
05-15-09, 01:30 PM
#24
Original Gangster/Rotary!
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I'm pretty positive this is the FS ad:
https://www.rx7club.com/canadian-sale-wanted-classifieds-120/fs-1993-lhd-canadian-rx-7-single-turbo-really-clean-fast-791783/
Looks like someone else built the motor.....also, who tuned it?
https://www.rx7club.com/canadian-sale-wanted-classifieds-120/fs-1993-lhd-canadian-rx-7-single-turbo-really-clean-fast-791783/
Looks like someone else built the motor.....also, who tuned it?
