What's the most HP you could get with a N/A?
08-09-01, 03:00 PM
#26
mad scientist
Originally posted by RETed
A Z32 turbo is one of the worst cars to race.  A stock one barely does mid to low 14's on the 1/4-mile track.  Due to the anti-squat geometry on the rear suspension, it is a VERY HARD car to launch correctly - how many really fast Z32's have you see at the drag strip?  Even a typically modded Z32 (intake, exhaust, more boost) barely cracks 13's in the 1/4-mile.
By your description, you car looks like it does the 1/4-mile at around mid to low 14's.  I know of another NA FC that cracked a 14.0x - that car ONLY dyno'd at 170hp to the rear wheels.
Eagerly awaiting dyno graphs.
-Ted
A Z32 turbo is one of the worst cars to race.  A stock one barely does mid to low 14's on the 1/4-mile track.  Due to the anti-squat geometry on the rear suspension, it is a VERY HARD car to launch correctly - how many really fast Z32's have you see at the drag strip?  Even a typically modded Z32 (intake, exhaust, more boost) barely cracks 13's in the 1/4-mile.
By your description, you car looks like it does the 1/4-mile at around mid to low 14's.  I know of another NA FC that cracked a 14.0x - that car ONLY dyno'd at 170hp to the rear wheels.
Eagerly awaiting dyno graphs.
-Ted
170 hp at the wheels would be 200-205 at the flywheel. That car probably weighed less then mine, so I think I would have at least that much hp. I probably should have ~220 flywheel(185 or so at the wheels), but my intake temps have been sky high lately. That would make 200-205 bhp sound much more appropriate for my car right now. Im working on a cold air box to get my intake temps down, and that should put me back to where I should be.
This is totally unrelated, but where do you think the stock MAF sensor limits hp to? I know it is quite restrictive.
08-09-01, 10:26 PM
#27
Lives on the Forum
SCCA IT legal cars need to run stock ECU's.
I haven't done too much R&D with the NA stuff, so I can't give you a good answer to the stock airflow meter restriction.  It's a much different case with the turbo airflow meter, since pressure is involved.  The NA airflow meter is a bit smaller than the turbo airflow meter.
You build a 250hp NA motor on stock ports, I'll buy one from you!
-Ted
I haven't done too much R&D with the NA stuff, so I can't give you a good answer to the stock airflow meter restriction.  It's a much different case with the turbo airflow meter, since pressure is involved.  The NA airflow meter is a bit smaller than the turbo airflow meter.
You build a 250hp NA motor on stock ports, I'll buy one from you!
-Ted
08-09-01, 11:38 PM
#28
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Originally posted by RETed
SCCA IT legal cars need to run stock ECU's.
I haven't done too much R&D with the NA stuff, so I can't give you a good answer to the stock airflow meter restriction.  It's a much different case with the turbo airflow meter, since pressure is involved.  The NA airflow meter is a bit smaller than the turbo airflow meter.
You build a 250hp NA motor on stock ports, I'll buy one from you!
-Ted
SCCA IT legal cars need to run stock ECU's.
I haven't done too much R&D with the NA stuff, so I can't give you a good answer to the stock airflow meter restriction.  It's a much different case with the turbo airflow meter, since pressure is involved.  The NA airflow meter is a bit smaller than the turbo airflow meter.
You build a 250hp NA motor on stock ports, I'll buy one from you!
-Ted
Do the 6-port sleeves have to be present/working? Can the be removed? Can the be REPLACED with fixed units that flow better? Does the AFM have to be the stock Mazda one?
Brad
08-09-01, 11:48 PM
#29
Lives on the Forum
Originally posted by rx7_ragtop
Do the 6-port sleeves have to be present/working? Can the be removed? Can the be REPLACED with fixed units that flow better? Does the AFM have to be the stock Mazda one?
Do the 6-port sleeves have to be present/working? Can the be removed? Can the be REPLACED with fixed units that flow better? Does the AFM have to be the stock Mazda one?
I don't think they care of the 6-ports are working or not, but you cannot pull the acutators.  You can't even mod the actuators.
Yes, the stock airflow meter is supposed to be there.
-Ted
08-11-01, 07:19 PM
#30
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They way SCCA rules state we can remove the six port actuators and sleeve as they are classified as smog related devices. After doing some research, (and will be putting this to the test) we feel from a road racing point of view, you are better off leaving them working as well as the VDI unit found on the '89 and later models as the change the characteristics of the torque band.
08-12-01, 11:46 PM
#31
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Originally posted by RETed
6-ports have to be there - there is very LITTLE mods you can do to the engine via these rules.
I don't think they care of the 6-ports are working or not, but you cannot pull the acutators.  You can't even mod the actuators.
Yes, the stock airflow meter is supposed to be there.
-Ted
6-ports have to be there - there is very LITTLE mods you can do to the engine via these rules.
I don't think they care of the 6-ports are working or not, but you cannot pull the acutators.  You can't even mod the actuators.
Yes, the stock airflow meter is supposed to be there.
-Ted
Brad
Getting some ideas now...
08-13-01, 06:42 PM
#34
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Originally posted by mazdaspeed7
On a stock port, the limit is probably 240-250 hp, but that is with every bolt on possible. Im pretty close to that on my car.
Current mod list:
cone filter
TB mod
ported intake manifold
RB dual outlet headers-->straight pipes all
the way to the mufflers
all emissions removed, including air pump
6 port sleeves removed
electric fan
UD pulleys, main and alternator
TII fuel pump and 550 cc secondaries
A/c and p/s removed
Crane Hi-6
NGK plug wires
timing advanced
some weight reduction...~2600 lbs
Redline ~8500 rpm
That puts me at about 230 bhp. I am doing the Mustang MAF sensor conversion as soon as I get the schematics for it. Other than that, theres not really anything else I can do without opening up my motor or doing forced induction.
On a stock port, the limit is probably 240-250 hp, but that is with every bolt on possible. Im pretty close to that on my car.
Current mod list:
cone filter
TB mod
ported intake manifold
RB dual outlet headers-->straight pipes all
the way to the mufflers
all emissions removed, including air pump
6 port sleeves removed
electric fan
UD pulleys, main and alternator
TII fuel pump and 550 cc secondaries
A/c and p/s removed
Crane Hi-6
NGK plug wires
timing advanced
some weight reduction...~2600 lbs
Redline ~8500 rpm
That puts me at about 230 bhp. I am doing the Mustang MAF sensor conversion as soon as I get the schematics for it. Other than that, theres not really anything else I can do without opening up my motor or doing forced induction.
08-13-01, 10:33 PM
#35
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Mazdaspeed, I'm gonna have to call you out on the whole 230 horsepower thing. Please go get your car dynoed and prove us wrong, he'll I'll even chip in a few bucks for your dyno time if you do break 200 to learn your secret. Without NOS, or porting, there's no way in hell you're getting near that without forced induction. (prove me wrong!)
As for the whole cold air box thing, I wouldn't bother, without having your air filter down near the front of the rad, I doubt its going to see that much cold air for you to make a difference.
As for the 300zx, you sure that it was a turbo? They have 300hp. Maybe it was broken.
What were you're times at the track?
As for the whole cold air box thing, I wouldn't bother, without having your air filter down near the front of the rad, I doubt its going to see that much cold air for you to make a difference.
As for the 300zx, you sure that it was a turbo? They have 300hp. Maybe it was broken.
What were you're times at the track?
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