248 rwhp is about the highest I've ever seen on a stock 1995 n/a motor. That corresponds to 9% drivetrain loss, which is less than people usually assume.
Dyno pull on my 993-corrected attachment
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Dyno pull on my 993-corrected attachment
At Virginia International Raceway, there is a dyno service at the track. Its a joint effort with Old Dominion University, so the price isn't bad (and the convenience is terrific).
A couple of weeks back, I had them do a series of 5 pulls; the average of 5 is attached.
Motor is stock 1995 w/factory chip, and RS mufflers. About 86,000 miles total, of which the last 4,000 or so are on the track.
From the looks of the results, it seems we are due a tune-up, especially as (I am told) the A/F ratio is not optimum at higher RPMs.
------------------------------------
Alright, know I know why you are all telling me I have 248 RWHP; I posted the wrong chart (this was the one with my car overlayed a similar motor with an RS cam).
Correct chart posted below.
Sorry for the wasted time.
A couple of weeks back, I had them do a series of 5 pulls; the average of 5 is attached.
Motor is stock 1995 w/factory chip, and RS mufflers. About 86,000 miles total, of which the last 4,000 or so are on the track.
From the looks of the results, it seems we are due a tune-up, especially as (I am told) the A/F ratio is not optimum at higher RPMs.
------------------------------------
Alright, know I know why you are all telling me I have 248 RWHP; I posted the wrong chart (this was the one with my car overlayed a similar motor with an RS cam).
Correct chart posted below.
Sorry for the wasted time.
Last edited by RickBetterley; Nov 20, 2008 at 03:44 PM. Reason: Posted wrong chart (I really am an idiot)
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I was hoping you would weigh in!
Am I right that the chip of choice is the one you sell? When I bought the car, the seller included another chip (uninstalled. He said it really didn't improve the performance (he too was tracking the car).
That chip has markings handwritten on the bottom '993RS') and 'M6420993' on the top.
Any idea if this is 1 of yours or who its made by?
More importantly, what are the performance improvements from your chip? This is track use only, on street 93 octane gas (I could put in race fuel but this hobby is expensive enough already!).
Thanks as always for your help.
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All I know is it is tough to keep up with my track buddies that have an RS cam (we plotted the 2 engines and the difference at higher RPMs was amazing).
ACTUALLY - where do we see 248? The highest I see is 235 or so; I am attaching the Excel spreadsheet of the readings.
I'd LOVE 248 RWHP.
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The hp/torque readings are printed at the peaks on the chart; 248.9 hp. 217.9 torque. Better than my 964 put down thats for sure.
O/T, but I just clicked on the link in Marks signature. Stunning house. I would kill for that detached garage.
O/T, but I just clicked on the link in Marks signature. Stunning house. I would kill for that detached garage.
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Hi Steve
I was hoping you would weigh in!
Am I right that the chip of choice is the one you sell? When I bought the car, the seller included another chip (uninstalled. He said it really didn't improve the performance (he too was tracking the car).
That chip has markings handwritten on the bottom '993RS') and 'M6420993' on the top.
Any idea if this is 1 of yours or who its made by?
More importantly, what are the performance improvements from your chip? This is track use only, on street 93 octane gas (I could put in race fuel but this hobby is expensive enough already!).
Thanks as always for your help.
I was hoping you would weigh in!
Am I right that the chip of choice is the one you sell? When I bought the car, the seller included another chip (uninstalled. He said it really didn't improve the performance (he too was tracking the car).
That chip has markings handwritten on the bottom '993RS') and 'M6420993' on the top.
Any idea if this is 1 of yours or who its made by?
More importantly, what are the performance improvements from your chip? This is track use only, on street 93 octane gas (I could put in race fuel but this hobby is expensive enough already!).
Thanks as always for your help.
That chip is not one of mine and I'd need a pic to see if I could ID it. If its a clone of the 993 3.8RS one, its no wonder that it didn't do anything,....
To maintain objectivity, I'd recommend that you check with other Rennlisters about our chips,...
I think they work OK but you should get feedback from others.Performance gains start about 3K and extend to the red line. We've altered the fuel maps to fill in the peaks & valleys left by the factory and take advantage of their ultra-conservative timimg maps for better throttle response and improved torque. Most people report smoother running, as well.
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Hi Rick,
That chip is not one of mine and I'd need a pic to see if I could ID it. If its a clone of the 993 3.8RS one, its no wonder that it didn't do anything,....
To maintain objectivity, I'd recommend that you check with other Rennlisters about our chips,... I think they work OK but you should get feedback from others.
Performance gains start about 3K and extend to the red line. We've altered the fuel maps to fill in the peaks & valleys left by the factory and take advantage of their ultra-conservative timimg maps for better throttle response and improved torque. Most people report smoother running, as well.
That chip is not one of mine and I'd need a pic to see if I could ID it. If its a clone of the 993 3.8RS one, its no wonder that it didn't do anything,....
To maintain objectivity, I'd recommend that you check with other Rennlisters about our chips,...
I think they work OK but you should get feedback from others.Performance gains start about 3K and extend to the red line. We've altered the fuel maps to fill in the peaks & valleys left by the factory and take advantage of their ultra-conservative timimg maps for better throttle response and improved torque. Most people report smoother running, as well.
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Hope you are looking at the right numbers; I posted the wrong chart originally (that one was a comparison of a friend's 993 w/RS cam overlayed with my stock 993). Correct chart is now posted above.
We'll work on that A/F ratio during the tuneup.
Dyno is a Mustang, I believe.
We'll work on that A/F ratio during the tuneup.
Dyno is a Mustang, I believe.
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Ah, so it looks like 230 rwhp, with AFRs dropping from about 12.8 at 3500 rpm to 11.0 at 6500.
I wouldn't worry about the 230 rwhp readings. All dynos read different and that's not out of the norm.
As for AFR, it's definitely a bit rich at redline, but it's not the worst thing in the world. I believe that's pretty typical of stock programming (some aftermarket chips too), but others may have more experience in that regard.
I wouldn't worry about the 230 rwhp readings. All dynos read different and that's not out of the norm.
As for AFR, it's definitely a bit rich at redline, but it's not the worst thing in the world. I believe that's pretty typical of stock programming (some aftermarket chips too), but others may have more experience in that regard.
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Mustang dynos always generate lower results than Dynojets so fair comparisons are really not valid between the two machines. Further, setup on a Mustang can really skew the figures, as well.
