No, not another dyno thread!
#1
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I finally broke down and went to Dynojet Dyno in Balanced Performance.
The setup again:
Stock engine 112000 miles
Exhintake cam
460 cc injectors
Garrett GT28R (2560) turbo (welded wastegate)
Tial 38 mm external wastegate with separate exhaust
3" exhaust
Tullos EBC
Emanage Ultimate piggyback
Ebay Blow off valve
RX-7 Gen II modified intercooler.
7 psi 184.1 hp 160.3 lbf/ft
8 psi 191.8 hp 166.9 lbf/ft
9 psi 208.9 hp 179.8 lbf/ft
the torque curves are very flat, boost start at 2000, is 5 psi at 2500.
Never tried more than 9 psi since the road race class, KCC and Nasa Super touring are based on power/weight ratio, and the next step above 210 hp would have been 244 and I assume it might be too much for this turbo to try to be there 40 minutes at the time. 9 psi should be quite conservative boost.
Comments?
hrk
The setup again:
Stock engine 112000 miles
Exhintake cam
460 cc injectors
Garrett GT28R (2560) turbo (welded wastegate)
Tial 38 mm external wastegate with separate exhaust
3" exhaust
Tullos EBC
Emanage Ultimate piggyback
Ebay Blow off valve
RX-7 Gen II modified intercooler.
7 psi 184.1 hp 160.3 lbf/ft
8 psi 191.8 hp 166.9 lbf/ft
9 psi 208.9 hp 179.8 lbf/ft
the torque curves are very flat, boost start at 2000, is 5 psi at 2500.
Never tried more than 9 psi since the road race class, KCC and Nasa Super touring are based on power/weight ratio, and the next step above 210 hp would have been 244 and I assume it might be too much for this turbo to try to be there 40 minutes at the time. 9 psi should be quite conservative boost.
Comments?
hrk
#7
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Yes I have, with stock injectors and poor setup.
Here is description:
http://russmarshall.com/v/cars/cmc7/cmpfeb2007/
And will again next weekend in Road Atlanta. Come and say Hi!
hrk
Here is description:
http://russmarshall.com/v/cars/cmc7/cmpfeb2007/
And will again next weekend in Road Atlanta. Come and say Hi!
hrk
#12
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Thanks,
I scanned a combination sheets with 3 documented runs.
![Name: dyno.jpg
Views: 91
Size: 63.8 KB](https://www.miataturbo.net/attachments/dynos-timesheets-21/216855d1501274390-no-not-another-dyno-thread-dyno.jpg)
Take a look at the torque, there is not buttloads of it, but it is pretty flat through rev range.
Please, remind me how to make O2 clamp with EMU?
hrk
I scanned a combination sheets with 3 documented runs.
![Name: dyno.jpg
Views: 91
Size: 63.8 KB](https://www.miataturbo.net/attachments/dynos-timesheets-21/216855d1501274390-no-not-another-dyno-thread-dyno.jpg)
Take a look at the torque, there is not buttloads of it, but it is pretty flat through rev range.
Please, remind me how to make O2 clamp with EMU?
hrk
#13
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hrk
Last edited by hrk; 03-09-2007 at 06:53 PM. Reason: checked log
#19
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Blatant misuse of timesheets:
Here is one from Sunday race at Road Atlanta
http://www.texicanracing.com/nasatx/...h/scan0018.jpg
1:34.814 around Road Atlanta makes average speed to 96 mph.
Very happy with results. The RX-7 finishing 1.1 seconds in front passed several people (including me) under yellow flag and got disqualified.
Towards the end of the race the water temp crept up to 220 F and there was some sputtering, took an easier lap to cool it down and went off again once temps were at 200 and the car was fine again to be pushed.
I need to add another radiator to the trunk of the car, fed by rear opening of the head.
Here is link to datalog from accelerating from standing start:
http://russmarshall.com/v/cars/cmc7/...geViewsIndex=1
hrk
Here is one from Sunday race at Road Atlanta
http://www.texicanracing.com/nasatx/...h/scan0018.jpg
1:34.814 around Road Atlanta makes average speed to 96 mph.
Very happy with results. The RX-7 finishing 1.1 seconds in front passed several people (including me) under yellow flag and got disqualified.
Towards the end of the race the water temp crept up to 220 F and there was some sputtering, took an easier lap to cool it down and went off again once temps were at 200 and the car was fine again to be pushed.
I need to add another radiator to the trunk of the car, fed by rear opening of the head.
Here is link to datalog from accelerating from standing start:
http://russmarshall.com/v/cars/cmc7/...geViewsIndex=1
hrk
Last edited by hrk; 03-20-2007 at 03:53 AM. Reason: added link to graph.