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So after getting my fuel pressure adjusted to its optimal point.
And getting my ignition timing a few degrees advanced.
And installing an upstream heated o2 sensor.
And cleaning a re-oiling my drop in k&n filter.
And replacing my egr valve and cleaning the passageways+intake manifold& throttle body.
As well as a new oil change for a good baseline comparison of feel.(it was also due to be done)
I unplugged the ecu and let it reset itself and drove it around the last fee days. To relearn itself.
I feel like I should give a review of the product because there hasn't really been one yet on a mostly stock aspire.
Keep in mind my car is stock except for
Drop in k&n filter
Dickmeyer adjustable fuel pressure regulator
Premium plug wires
NGK iridium spark plugs
Denso heated O2 sensor
Dickmeyer longtube header
2" exhaust consisting of all 2"in/out;
Magnaflow catalytic converter
Magnaflow 18" resonator
Magnaflow stock sized muffler straight through center in/out.
I'll start off saying the header itself is constructed well.
I love how there is a bung for the narrowband sensor.
As well as an extra bung for the addition of a wideband o2 at a later point.
The flex bellow ordered with it was nice to have for flexing under engine load/accelleration.
He recommended a "2-2.5 exhaust behind the collector.
I went with 2" simply because my car doesn't flow enough air to need the extra ".5
Had to keep velocity high.
First notice was that there was lack of power down low until I stepped on the gas.
I had to bump up the fuel pressure 2lbs to reduce the effect.
Then when it persisted I did some checking and realised that the o2 sensor was not staying warmed up enough to maintain closed loop status/read accurate a/f ratios at idle+part throttle+low rpm driving.
It is a common problem with most vehicles that upgrade to longtube headers.
So got a Denso 234-4000 3 wire heated o2 sensor as reccommended via email sent to a Denso technician.
Wired it up and it made a huge difference at idle and part throttle.
A heated o2 sensor I would say is required if you decide to get this product.
It was $35 on eBay for mine.
But then there was still something to be desired.
The powerband was a little off.
that's when I had to learn to understand the whole timing adjustment thing.
Fuel burns at different rates based on the air fuel ratios of the new setup+extra fuel.
So adjusting it up and down I found the point of over advance&under advanced.
Then adjusted accordingly to find the sweet spot.
Too advanced and the power hit all down low but not up high.
Stock advance or retarded made it a dog at low rpms/part throttle but power up high.
Then just right netted me extra torque down low as well as the kick up high in the rpms.
It took me some time to realise &solve the fact that exhaust systems don't have to lose torque and power at low rpms.
The vehicle just need to be adjusted to the new setup.
This is the first exhaust system I've gotten to piece together fully.
Work on fully.
And understand the inner workings fully.
And now that's its complete until further upgrades.
I just gotta say wow this setup really makes a difference.
I'm not sure how much horsepower exactly was gained since every vehicle is different.
But if we went on the low side of his 8hp on stock car with stock exhaust
and 14.5 on a modded vehicle with some port polish.
8hp added to 63=71hp
That's a %12.7 gain.
If it was 10hp added to 63=73
That would be a %15 gain.
But for a %12.7-%15 gain in power.
It gives me plenty of torque to to accelerate out of 1st/2nd/3rd
And get up to speed.
It is very very noticeable.
It gives the car a nice sporty feel.
And I must say it was a well designed carefully crafted piece of work.
I am very very happy with this product.
It will put a smile on your face anytime your using the gas pedal :-)
And getting my ignition timing a few degrees advanced.
And installing an upstream heated o2 sensor.
And cleaning a re-oiling my drop in k&n filter.
And replacing my egr valve and cleaning the passageways+intake manifold& throttle body.
As well as a new oil change for a good baseline comparison of feel.(it was also due to be done)
I unplugged the ecu and let it reset itself and drove it around the last fee days. To relearn itself.
I feel like I should give a review of the product because there hasn't really been one yet on a mostly stock aspire.
Keep in mind my car is stock except for
Drop in k&n filter
Dickmeyer adjustable fuel pressure regulator
Premium plug wires
NGK iridium spark plugs
Denso heated O2 sensor
Dickmeyer longtube header
2" exhaust consisting of all 2"in/out;
Magnaflow catalytic converter
Magnaflow 18" resonator
Magnaflow stock sized muffler straight through center in/out.
I'll start off saying the header itself is constructed well.
I love how there is a bung for the narrowband sensor.
As well as an extra bung for the addition of a wideband o2 at a later point.
The flex bellow ordered with it was nice to have for flexing under engine load/accelleration.
He recommended a "2-2.5 exhaust behind the collector.
I went with 2" simply because my car doesn't flow enough air to need the extra ".5
Had to keep velocity high.
First notice was that there was lack of power down low until I stepped on the gas.
I had to bump up the fuel pressure 2lbs to reduce the effect.
Then when it persisted I did some checking and realised that the o2 sensor was not staying warmed up enough to maintain closed loop status/read accurate a/f ratios at idle+part throttle+low rpm driving.
It is a common problem with most vehicles that upgrade to longtube headers.
So got a Denso 234-4000 3 wire heated o2 sensor as reccommended via email sent to a Denso technician.
Wired it up and it made a huge difference at idle and part throttle.
A heated o2 sensor I would say is required if you decide to get this product.
It was $35 on eBay for mine.
But then there was still something to be desired.
The powerband was a little off.
that's when I had to learn to understand the whole timing adjustment thing.
Fuel burns at different rates based on the air fuel ratios of the new setup+extra fuel.
So adjusting it up and down I found the point of over advance&under advanced.
Then adjusted accordingly to find the sweet spot.
Too advanced and the power hit all down low but not up high.
Stock advance or retarded made it a dog at low rpms/part throttle but power up high.
Then just right netted me extra torque down low as well as the kick up high in the rpms.
It took me some time to realise &solve the fact that exhaust systems don't have to lose torque and power at low rpms.
The vehicle just need to be adjusted to the new setup.
This is the first exhaust system I've gotten to piece together fully.
Work on fully.
And understand the inner workings fully.
And now that's its complete until further upgrades.
I just gotta say wow this setup really makes a difference.
I'm not sure how much horsepower exactly was gained since every vehicle is different.
But if we went on the low side of his 8hp on stock car with stock exhaust
and 14.5 on a modded vehicle with some port polish.
8hp added to 63=71hp
That's a %12.7 gain.
If it was 10hp added to 63=73
That would be a %15 gain.
But for a %12.7-%15 gain in power.
It gives me plenty of torque to to accelerate out of 1st/2nd/3rd
And get up to speed.
It is very very noticeable.
It gives the car a nice sporty feel.
And I must say it was a well designed carefully crafted piece of work.
I am very very happy with this product.
It will put a smile on your face anytime your using the gas pedal :-)
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