Shut off motor between runs and spray or let idle and spray? Which will make more HP?
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Originally Posted by TeamRX8
that's why you have to retune the jets and set the bowl fuel level height just right 
Rotary only since 1980
Joined: May 2003
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From: Southeast of Seattle
I recall reading a thread about the Racing Beat open house where they were showing their engine test bench. They could maniupulate the various ECU inputs to see the effect on the engine. IIRC, coolant temperature had a significant effect on engine output.
Rotary only since 1980
Joined: May 2003
Posts: 587
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From: Southeast of Seattle
Fastmike,
I'm sorry but I don't remember the details. I tried to search to find the thread but didn't find it. In short, RB was able to turn a dial and simulate different coolant temps to the ECU. After a certain temperature, the ECU changed either the fuel map or timing (that's the detail I don't remember.
).
I would suggest that you ask the question to Racing Beat. Jim Langer was the one demo-ing the test bench (IIRC). RotaryGod and some other forum regulars were in attendance. Seach for "Racing Beat focus group" for a discussioin of the session.
I'm sorry but I don't remember the details. I tried to search to find the thread but didn't find it. In short, RB was able to turn a dial and simulate different coolant temps to the ECU. After a certain temperature, the ECU changed either the fuel map or timing (that's the detail I don't remember.
). I would suggest that you ask the question to Racing Beat. Jim Langer was the one demo-ing the test bench (IIRC). RotaryGod and some other forum regulars were in attendance. Seach for "Racing Beat focus group" for a discussioin of the session.
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From: Kennewick, Wa
so end product. Drive first : Now what about numbers
Ok FastMike, lets hear the numbers on the HP and TORQ measurements when in 1st , and 2nd. and any other numbers for any other gears.
Thanks
Bring that 8 over to the the Tricities next week end
Thanks
Bring that 8 over to the the Tricities next week end
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Joined: Mar 2003
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From: Around
Here's what I do when I run my RX-7 (autox or 1/4 mile)
open the hood and let it idle with AC on (to turn on the fans) for a few minutes
shut it off but let keep the fans running
when moving in the staging lanes I start it, move it and shut it off again, this circulates the cooled coolant throught the engine but doesn't give it time to heat it up again
open the hood and let it idle with AC on (to turn on the fans) for a few minutes
shut it off but let keep the fans running
when moving in the staging lanes I start it, move it and shut it off again, this circulates the cooled coolant throught the engine but doesn't give it time to heat it up again
Originally Posted by fastmike
You only dyno is 5th gear.
We were hoping to bring the car to Bremerton next weekend but maybe not now...
Today's best hp peak at 177 and best TQ at 134.(run2 of the day)
Down from there....worst(taking out the first cold pull) was 170/129.
Most were low 170's and low 130's.
Last test of her car(same dyno)with ghetto straight pipe and stock exhaust on 2/26/05 got a repeatable mid 180's and mid 130's on TQ. Straight pipe getting much more overrev compared to stock exhaust that day and more peak hp. Stock just starts dropping hp/tq severely at 8500 rpms. Doesn't even make it to the 9100 rpm rev limiter on any of the 3 runs with stock exhaust. Dyno must stop recording when it sees such a drastic downward line or when it gets below 50 ftllbs or something.
We are going to go back to a true straight pipe and see if her cats are plugging? One car during the 2/26/05 test had melted/plugged cats and he couldn't get over 130 hp even though the car still sounded ok.
Maybe the muffler we went with is causing some restriction??
We should be able to replicate the earlier tests???
Maybe we will get the straight pipe on early this week and do a quickie dyno one afternoon. If we can find our "lost" hp, we will bring the 8 to Bremerton..
SURE WOULD BE NICE IF SOMEONE WOULD INVITE US TO THE PCA EVENT ON SATURDAY! LOL!
Hmmm...who could do that?
FM
We were hoping to bring the car to Bremerton next weekend but maybe not now...
Today's best hp peak at 177 and best TQ at 134.(run2 of the day)
Down from there....worst(taking out the first cold pull) was 170/129.
Most were low 170's and low 130's.
Last test of her car(same dyno)with ghetto straight pipe and stock exhaust on 2/26/05 got a repeatable mid 180's and mid 130's on TQ. Straight pipe getting much more overrev compared to stock exhaust that day and more peak hp. Stock just starts dropping hp/tq severely at 8500 rpms. Doesn't even make it to the 9100 rpm rev limiter on any of the 3 runs with stock exhaust. Dyno must stop recording when it sees such a drastic downward line or when it gets below 50 ftllbs or something.
We are going to go back to a true straight pipe and see if her cats are plugging? One car during the 2/26/05 test had melted/plugged cats and he couldn't get over 130 hp even though the car still sounded ok.
Maybe the muffler we went with is causing some restriction??
We should be able to replicate the earlier tests???
Maybe we will get the straight pipe on early this week and do a quickie dyno one afternoon. If we can find our "lost" hp, we will bring the 8 to Bremerton..
SURE WOULD BE NICE IF SOMEONE WOULD INVITE US TO THE PCA EVENT ON SATURDAY! LOL!
Hmmm...who could do that?
FM
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Originally Posted by neit_jnf
open the hood and let it idle with AC on (to turn on the fans) for a few minutes
When I'm done with a run, AC is OFF, but I turn the fans on full blast and heat all the way up. Can't sit in the car between runs though. :D
I used to idle the car for 30 sec or a minute before turning off the engine and leaving the fans going. But then I had a scary moment when the 8 didn't want to start bewteen runs (need that battery TSB). Since I'm not super competitive (yet) I figure I'm in it for fun, leave it idling.
Originally Posted by pcimino
I'm confused, everyone keeps talking about leaving the AC on. Do you just mean the vent fans?
When I'm done with a run, AC is OFF, but I turn the fans on full blast and heat all the way up. Can't sit in the car between runs though. :D
I used to idle the car for 30 sec or a minute before turning off the engine and leaving the fans going. But then I had a scary moment when the 8 didn't want to start bewteen runs (need that battery TSB). Since I'm not super competitive (yet) I figure I'm in it for fun, leave it idling.
When I'm done with a run, AC is OFF, but I turn the fans on full blast and heat all the way up. Can't sit in the car between runs though. :D
I used to idle the car for 30 sec or a minute before turning off the engine and leaving the fans going. But then I had a scary moment when the 8 didn't want to start bewteen runs (need that battery TSB). Since I'm not super competitive (yet) I figure I'm in it for fun, leave it idling.
JV
You do know we're talking about the radiator fan, not the interior ventilation fan, right?
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