90' Civic D15b Q's Help a newbie...
09-13-2003, 03:14 AM
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90' Civic D15b Q's Help a newbie...
Hey all... im new to these forums and have some questions regarding my engine...
NOTE: i have done a search already and couldnt pull up any satisfactory results, so if i ask something thats already been asked please dont be mad...
OK...
my car: Honda Civic '90 model, D15B SOHC Dual Carb 1.6L.
1. I've asked an engine specialist about if i could change the carbs to some bigger ones, and he told me this 'The carbs on those engines are a sort of hybrid between a Carb and a Single point fuel injection system, so swapping the carbs for bigger ones won't work'
Now is this true or not.
2. Been trying to get an air filter for my car, and again seeing as its a carbed car im having trouble locating a performance filter for it. Any ideas??
if not would it work if i just ripped out the filter lining in the current setup and just bolted a pod filter the end of the intake pipe??
the other option i thought of was just punching a hole in the bonnet and putting a scoop there, then building a heat shroud around the filter so it sits flush with the bonnet when closed... cant just remove the cover cos the filter is behind my engine, meaning i get hot air into my filter which aint good.
3. im looking at installing a cat back exhaust, 2", is that enough?? too big? too small?? ive also been told not to bother with a mandrel bent system cos its more expensive, doesnt last as long, and really only benefits turbos...
is this correct??
4. i have read about vtech head swaps on d15b's on this forum, now does this work on my carbed engine?? i take it there is an EFI version of my engine model. How much work is needed to get this happening?? and how expensive.
Anything else i could do to improve performance?? for less than the cost of an engine swap??
Now after all this am i better off just bolting in a b16a??
btw could i get answers to my questions anyway even if an engine swap is the better solution, because if i do have a dead end engine, i'd like to at least understand why...
Cheers and thanks in advance guys...
(btw i live in Australia so i dont know if the engines may be different or what)
also if pics are needed to visualise what im talking about please let me know and i'll post a link.
also if the above mentioned parts are available please supply links to them if you can...
Thanks again
NOTE: i have done a search already and couldnt pull up any satisfactory results, so if i ask something thats already been asked please dont be mad...
OK...
my car: Honda Civic '90 model, D15B SOHC Dual Carb 1.6L.
1. I've asked an engine specialist about if i could change the carbs to some bigger ones, and he told me this 'The carbs on those engines are a sort of hybrid between a Carb and a Single point fuel injection system, so swapping the carbs for bigger ones won't work'
Now is this true or not.
2. Been trying to get an air filter for my car, and again seeing as its a carbed car im having trouble locating a performance filter for it. Any ideas??
if not would it work if i just ripped out the filter lining in the current setup and just bolted a pod filter the end of the intake pipe??
the other option i thought of was just punching a hole in the bonnet and putting a scoop there, then building a heat shroud around the filter so it sits flush with the bonnet when closed... cant just remove the cover cos the filter is behind my engine, meaning i get hot air into my filter which aint good.
3. im looking at installing a cat back exhaust, 2", is that enough?? too big? too small?? ive also been told not to bother with a mandrel bent system cos its more expensive, doesnt last as long, and really only benefits turbos...
is this correct??
4. i have read about vtech head swaps on d15b's on this forum, now does this work on my carbed engine?? i take it there is an EFI version of my engine model. How much work is needed to get this happening?? and how expensive.
Anything else i could do to improve performance?? for less than the cost of an engine swap??
Now after all this am i better off just bolting in a b16a??
btw could i get answers to my questions anyway even if an engine swap is the better solution, because if i do have a dead end engine, i'd like to at least understand why...
Cheers and thanks in advance guys...
(btw i live in Australia so i dont know if the engines may be different or what)
also if pics are needed to visualise what im talking about please let me know and i'll post a link.
also if the above mentioned parts are available please supply links to them if you can...
Thanks again
09-13-2003, 04:20 AM
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You are using the same engine as mine... dual carb D15B ... it's actually 1.5L ... not 1.6.
From what I've known this dual carb doesn't work simultaneously, the 2nd carb only activates when there is the need for more air and fuel, mostly on higher revs. I don't know how to explain this technically, but I think you should get the idea.
About performance filter, I just remove the drop in filter and bolt an open pod filter at the end of the intake pipe, of course you will need to do some modification on the joining, like using an adapter. it's better than taking off the carb cover.
If the engine is still stock, it's better to get 1.8", but 2" should be the max, unless the engine is heavily moded(ie cams,high comp pistons etc.).Mandrel bent is the best, and it doesn't matter if it's turbo or not... because mandrel bent provides better exhaust gas flow.
D15b carbs and D15B sohc vtec are sharing the same block design, so it should be possible to do the hybrid. make sure u get the complete engine head with intake manifold, harness and the ECU.
lastly.... of course the B16A swap is still the best. JDM honda parts are cheap in Australia if I'm not mistaken.
From what I've known this dual carb doesn't work simultaneously, the 2nd carb only activates when there is the need for more air and fuel, mostly on higher revs. I don't know how to explain this technically, but I think you should get the idea.
About performance filter, I just remove the drop in filter and bolt an open pod filter at the end of the intake pipe, of course you will need to do some modification on the joining, like using an adapter. it's better than taking off the carb cover.
If the engine is still stock, it's better to get 1.8", but 2" should be the max, unless the engine is heavily moded(ie cams,high comp pistons etc.).Mandrel bent is the best, and it doesn't matter if it's turbo or not... because mandrel bent provides better exhaust gas flow.
D15b carbs and D15B sohc vtec are sharing the same block design, so it should be possible to do the hybrid. make sure u get the complete engine head with intake manifold, harness and the ECU.
lastly.... of course the B16A swap is still the best. JDM honda parts are cheap in Australia if I'm not mistaken.
09-13-2003, 05:13 AM
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Re: (soulfly)
ok cool, i get it, now i know why im getting that sudden pickup at higher revs,
that does answer most of my questions... cheers...
but is it possible to replace the carbs??
how much of a performance gain do i get from the vtech head? does that mean changing to an efi setup?? or do i still retain the carbs?
how much would a head swap set me back approx?
i thought it was a 1.5, but someone told me it was a 1.6, so i guess im back to 1.5 eh...
with the filter, would increasing the size of the intake pipe be good?? cos the pipe is quite a bit smaller than what ive seen on some other civics, would i get better airflow from it therefore more power?? what should the max diameter of the intake be.
Thanks again, good to hear from ppl who know what they are talking about...
that does answer most of my questions... cheers...
but is it possible to replace the carbs??
how much of a performance gain do i get from the vtech head? does that mean changing to an efi setup?? or do i still retain the carbs?
how much would a head swap set me back approx?
i thought it was a 1.5, but someone told me it was a 1.6, so i guess im back to 1.5 eh...
with the filter, would increasing the size of the intake pipe be good?? cos the pipe is quite a bit smaller than what ive seen on some other civics, would i get better airflow from it therefore more power?? what should the max diameter of the intake be.
Thanks again, good to hear from ppl who know what they are talking about...
09-13-2003, 05:38 PM
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Re: (depoch)
Well you would not want to replace the carbs, you want to replace the whole intake system. that will get you into mpfi instead of dpfi. You will gain more horse from doing this. I have not done it yet, but i am very confident it will not be that hard. Search for dpfi-mpfi. This will open the door for you. Hope that helps.
Matt
Matt
09-13-2003, 06:45 PM
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Re: 90' Civic D15b Q's Help a newbie... (depoch)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by depoch »</TD></TR><TR><TD CLASS="quote">my car: Honda Civic '90 model, D15B SOHC Dual Carb 1. 5 L.
Now after all this am i better off just bolting in a b16a??
</TD></TR></TABLE>
I had a d15, then went with a b16 after i finally warped the head on the old motor. The d series motors are some workhorses, or should i say ponies.. I beat on mine, hittin the rev. limit and stuff for like two min and it wouldn't blow. BUT...
The b16 is almost 2 times the power of your current setup. Depending on how deep your pockets are, will be the main factor in what to go with.
I can't help you much more than that.
2.25 piping would be fine also.
That would be cool and different to stay with the carbs...
Now after all this am i better off just bolting in a b16a??
</TD></TR></TABLE>
I had a d15, then went with a b16 after i finally warped the head on the old motor. The d series motors are some workhorses, or should i say ponies.. I beat on mine, hittin the rev. limit and stuff for like two min and it wouldn't blow. BUT...
The b16 is almost 2 times the power of your current setup. Depending on how deep your pockets are, will be the main factor in what to go with.
I can't help you much more than that.
2.25 piping would be fine also.
That would be cool and different to stay with the carbs...
09-15-2003, 06:35 AM
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Re: 90' Civic D15b Q's Help a newbie... (B16_madman)
damnit, couldnt have more than 5 replies in 24 hrs... good idea to stop lamerz spamming the boards but a pain in the **** for n00bs with genuine questions...
oh well you win some you lose some...
anyway back on topic
1. i want a good exhaust note with my system, but i dont want the sound to drone, plus i don wanna go too big and lose low end power... whats the point of ur car pickin up at high revs when it takes off like a snail...
2. atm i dont have deep pockets otherwise i woulda done a b16a conversion already...
3. how do you post images on this board?? i got some before and after pics of my airfilter install... seeing as it was using one of those oldschool carb filters, i modded it so that i could fit a pod filter on the end of the intake.
does the job.
4. when u do a EFI mod, do u have to change the pumps and sensors in the fuel tank too??
saving my posts to keep this thread alive long enough for ppl to answer my q's...
oh well you win some you lose some...
anyway back on topic
1. i want a good exhaust note with my system, but i dont want the sound to drone, plus i don wanna go too big and lose low end power... whats the point of ur car pickin up at high revs when it takes off like a snail...
2. atm i dont have deep pockets otherwise i woulda done a b16a conversion already...
3. how do you post images on this board?? i got some before and after pics of my airfilter install... seeing as it was using one of those oldschool carb filters, i modded it so that i could fit a pod filter on the end of the intake.
does the job.
4. when u do a EFI mod, do u have to change the pumps and sensors in the fuel tank too??
saving my posts to keep this thread alive long enough for ppl to answer my q's...
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09-15-2003, 01:58 PM
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Re: 90' Civic D15b Q's Help a newbie... (depoch)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by depoch »</TD></TR><TR><TD CLASS="quote">damnit, couldnt have more than 5 replies in 24 hrs... good idea to stop lamerz spamming the boards but a pain in the **** for n00bs with genuine questions...
oh well you win some you lose some...
anyway back on topic
1. i want a good exhaust note with my system, but i dont want the sound to drone, plus i don wanna go too big and lose low end power... whats the point of ur car pickin up at high revs when it takes off like a snail...
2. atm i dont have deep pockets otherwise i woulda done a b16a conversion already...
3. how do you post images on this board?? i got some before and after pics of my airfilter install... seeing as it was using one of those oldschool carb filters, i modded it so that i could fit a pod filter on the end of the intake.
does the job.
4. when u do a EFI mod, do u have to change the pumps and sensors in the fuel tank too??
saving my posts to keep this thread alive long enough for ppl to answer my q's...
</TD></TR></TABLE>
I can't answer any of your questions, but I will give you some advice.
Save your money, don't put any money into that stock engine. Realistically, that d15b has very little potential and with bolt ons you will net maybe 10 WHP. I don't mean to discourage you, but it is a realistic point of view.
But, if a d16a6 or d16z6 or a b16a isn't an option, the MPFI conversion will net you some HP, If you want serious performance an engine swap is your best bet.
Good luck
oh well you win some you lose some...
anyway back on topic
1. i want a good exhaust note with my system, but i dont want the sound to drone, plus i don wanna go too big and lose low end power... whats the point of ur car pickin up at high revs when it takes off like a snail...
2. atm i dont have deep pockets otherwise i woulda done a b16a conversion already...
3. how do you post images on this board?? i got some before and after pics of my airfilter install... seeing as it was using one of those oldschool carb filters, i modded it so that i could fit a pod filter on the end of the intake.
does the job.
4. when u do a EFI mod, do u have to change the pumps and sensors in the fuel tank too??
saving my posts to keep this thread alive long enough for ppl to answer my q's...
</TD></TR></TABLE>
I can't answer any of your questions, but I will give you some advice.
Save your money, don't put any money into that stock engine. Realistically, that d15b has very little potential and with bolt ons you will net maybe 10 WHP. I don't mean to discourage you, but it is a realistic point of view.
But, if a d16a6 or d16z6 or a b16a isn't an option, the MPFI conversion will net you some HP, If you want serious performance an engine swap is your best bet.
Good luck
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