HKS cast turbo manifold for L15a available...... sort of
#1
HKS cast turbo manifold for L15a available...... sort of
I am building turbo kit using a 2008 Fit Sport engine in my 2002 Insight. I just happened to have a Cast Manifold from the HKS RSX kit laying around and set the L15 gasket over the face of it and it looked good so I got out my caliper and got to measuring..... long story short, it will work. the exhaust ports are 1.25" and the K20 ports are 1.75". The step open is abrupt and not ideal but the head ports are in fact completely unobstructed by the ever so slightly offset and re-drilled K20 manifold. Im still a while away from having this running but I figured I throw this out here for those looking for a solution. These are available new for around $200
Build thread-1G Insight w/L15a Fit A/T ultimate commuter - Honda-Tech
Build thread-1G Insight w/L15a Fit A/T ultimate commuter - Honda-Tech
#2
Very interested to see how this turns out.
I have a few questions, will it bolt right on to the L15A head or are you going to redrill the HKS manifold for that?
And about the ports, are you going to port-match the L15A exhaust port to the HKS ones?
What turbo housing are you going to use?
I have a few questions, will it bolt right on to the L15A head or are you going to redrill the HKS manifold for that?
And about the ports, are you going to port-match the L15A exhaust port to the HKS ones?
What turbo housing are you going to use?
Last edited by dgraz0r; 02-10-2017 at 11:40 AM.
#3
I have in fact redrilled the manifold, I won't be port matching the head as it would be tough to make it with it and this is the biggest compromise vs just building one but worth it for me due to ease, reliability, and cost. Ill be using the Garrett GT2554r turbo.
Last edited by Bongobennie; 02-10-2017 at 06:22 PM.
#4
I've been really debating myself whether to turbo the Fit or sell it and buy a Vitz Rs Turbo
#5
I bought mine off eBay over 5 years ago, I did a quick google search and found this but cannot suggest the seller, there are a few different people selling them Acura RSX HKS Turbo Exhaust Manifold - Cast Iron
I would assume that this could be done to any manifold but I really don't know. Rev Hard might be a good try, its a top mount T3......
Also I was at the last thread on the two exhaust studs and wanted 5mm more length, found the Nissan GTR studs are perfect and will be using 5 of them.
I would assume that this could be done to any manifold but I really don't know. Rev Hard might be a good try, its a top mount T3......
Also I was at the last thread on the two exhaust studs and wanted 5mm more length, found the Nissan GTR studs are perfect and will be using 5 of them.
Last edited by Bongobennie; 02-10-2017 at 09:46 PM.
#6
I bought mine off eBay over 5 years ago, I did a quick google search and found this but cannot suggest the seller, there are a few different people selling them Acura RSX HKS Turbo Exhaust Manifold - Cast Iron
I would assume that this could be done to any manifold but I really don't know. Rev Hard might be a good try, its a top mount T3......
Also I was at the last thread on the two exhaust studs and wanted 5mm more length, found the Nissan GTR studs are perfect and will be using 5 of them.
I would assume that this could be done to any manifold but I really don't know. Rev Hard might be a good try, its a top mount T3......
Also I was at the last thread on the two exhaust studs and wanted 5mm more length, found the Nissan GTR studs are perfect and will be using 5 of them.
Meanwhile I'll be looking forward for your build until I can figure out what I'll do.
Daaamn it´s too hard to decide to stay with the Fit, go with the Vitz or the Glanza.
Btw thanks for answering my concerns
#8
I don't have an on car pic of it right now but one of the new holes I drilled is rather close to the exhaust runner but a sleeve or a bolt instead of studs will fix it. Also keep in mind the the K20 ports are much larger so there will be a stepped opening but this has be done by the V8 crowd for years. Also I have my engine in a different car so headers will definitely need to be checked. I would say that any header 'should' be able to fit at the flange though.
#9
Very interesting. I would love to get my hands on a 1st gen Insight, they are so light!
Do you plan on changing the internals? I see the GT2554 is good for around 270 whp, and the stock L15A tends to brake not much after 200 ft/lbs. I am interested to see your dyno results with this turbo with not only the power band but how early it spools.
Do you plan on changing the internals? I see the GT2554 is good for around 270 whp, and the stock L15A tends to brake not much after 200 ft/lbs. I am interested to see your dyno results with this turbo with not only the power band but how early it spools.
#10
Very interesting. I would love to get my hands on a 1st gen Insight, they are so light!
Do you plan on changing the internals? I see the GT2554 is good for around 270 whp, and the stock L15A tends to brake not much after 200 ft/lbs. I am interested to see your dyno results with this turbo with not only the power band but how early it spools.
Do you plan on changing the internals? I see the GT2554 is good for around 270 whp, and the stock L15A tends to brake not much after 200 ft/lbs. I am interested to see your dyno results with this turbo with not only the power band but how early it spools.
#11
The step is no big deal, pretty much standard to have 1/8 to 1/4 inch jump especially if your using stepped headers (IE NASCAR) to get the big torque numbers.
I have a couple acquaintances that do big power motors for sprints and midgets and they want the step, supposedly it helps reduce exhaust gas reversion. Both of them claim port matching for a step up junction nets no real improvement and these are NA motors running methanol making over 800 hp out if a 350 chev block, and 400+ HP out of a 2 liter 4 cylinder..
At sub 8psi numbers spool time is negligible on any quality name turbo, you give up a tiny bit off the line but after that its even. Oil cooled turbos are just center sections that only have oil and no water,, lots of engines run years that way and at your boost goals I'd consider water cooling a "nice to have" not a need. That being said, do not run a blanket on the turbo with no water cooling, you want some air around the center section so when you shut down it can cool without baking..
I'd consider a bypass valve setup for a small motor like ours that revs up pretty quick in first in the auto, plus takes a little of the load off the transmission till your rolling.
I have a couple acquaintances that do big power motors for sprints and midgets and they want the step, supposedly it helps reduce exhaust gas reversion. Both of them claim port matching for a step up junction nets no real improvement and these are NA motors running methanol making over 800 hp out if a 350 chev block, and 400+ HP out of a 2 liter 4 cylinder..
At sub 8psi numbers spool time is negligible on any quality name turbo, you give up a tiny bit off the line but after that its even. Oil cooled turbos are just center sections that only have oil and no water,, lots of engines run years that way and at your boost goals I'd consider water cooling a "nice to have" not a need. That being said, do not run a blanket on the turbo with no water cooling, you want some air around the center section so when you shut down it can cool without baking..
I'd consider a bypass valve setup for a small motor like ours that revs up pretty quick in first in the auto, plus takes a little of the load off the transmission till your rolling.
#12
now you got me thinking.... I can go in the opposite direction and go with a T3 50 trim (the small stock one, not T4) that would spool nice and slow and even. This car is purpose built for freeway commuting #1(not racing, not city driving, maybe embracing the laggy turbo IS a wise choice? I have had turbos in my youth but this is all new again, I also had swaps more recently but with K motors in K cars. I have also NEVER messed with an automatic. I have made posts on a few different forums but most answers are very race oriented. In all honesty what drove me to turbocharge in the first place was the fact I have no room for an intake manifold and short is the only way..... If you can make the argument for an NA automatic 2000 pound Insight, Im all ears as I am about to pull the trigger on the turbo. My NA thought were this... My father has been building custom headers since the 70s, I could build a header type intake manifold and I could run a header with 40" primaries ... Cat Cams makes several street cams of which the mild would be my pic if any as I would prefer to have the best MPG possible.
Of all the people I have talk to, few have messed with the Fit. Keep in mind, my wife car is an 08 Fit so I do get to drive it around, its slow.
Of all the people I have talk to, few have messed with the Fit. Keep in mind, my wife car is an 08 Fit so I do get to drive it around, its slow.
Last edited by Bongobennie; 02-19-2017 at 01:53 PM.
#13
now you got me thinking.... I can go in the opposite direction and go with a T3 50 trim (the small stock one, not T4) that would spool nice and slow and even. This car is purpose built for freeway commuting #1(not racing, not city driving, maybe embracing the laggy turbo IS a wise choice? I have had turbos in my youth but this is all new again, I also had swaps more recently but with K motors in K cars. I have also NEVER messed with an automatic. I have made posts on a few different forums but most answers are very race oriented. In all honesty what drove me to turbocharge in the first place was the fact I have no room for an intake manifold and short is the only way..... If you can make the argument for an NA automatic 2000 pound Insight, Im all ears as I am about to pull the trigger on the turbo. My NA thought were this... My father has been building custom headers since the 70s, I could build a header type intake manifold and I could run a header with 40" primaries ... Cat Cams makes several street cams of which the mild would be my pic if any as I would prefer to have the best MPG possible.
Of all the people I have talk to, few have messed with the Fit. Keep in mind, my wife car is an 08 Fit so I do get to drive it around, its slow.
Of all the people I have talk to, few have messed with the Fit. Keep in mind, my wife car is an 08 Fit so I do get to drive it around, its slow.
#15
One of the mysteries I have had in my mind is how the car would shift, Ive had zero opinion until now.... One thing I want is to be able to step on the gas full throttle at any time without worrying about anything breaking besides traction. 110 to the wheels would be about as low as I would want but maybe, thing is I will have flashpro so why not..... The one supercharged fit guy ran 12psi with zero trans issues. (all I have to go from, this one guy) Maybe a 2560 would be a bit softer on the trans? 2854?(bigger turbine) or maybe a journal bearing version of any of them?
#16
One of the mysteries I have had in my mind is how the car would shift, Ive had zero opinion until now.... One thing I want is to be able to step on the gas full throttle at any time without worrying about anything breaking besides traction. 110 to the wheels would be about as low as I would want but maybe, thing is I will have flashpro so why not..... The one supercharged fit guy ran 12psi with zero trans issues. (all I have to go from, this one guy) Maybe a 2560 would be a bit softer on the trans? 2854?(bigger turbine) or maybe a journal bearing version of any of them?
#17
The bypass valve would let the engine start out like its NA, then ramp in the turbo later than a race application. Basically your using a blow off valve backwards, same principle as the bypass valve on a eaton supercharger, The turbo spins up with little resistance then the valve ramps the boost up at the throttle body. Way back HKS sold a whole setup like this for the Mitz Mirage Turbo,,, it made them quite a fun ride and they hardly ever had issues with the engine stress. You might also tighten up the auto by using a different ATF?, something like the old trick shift they used to sell to replace dextron? I haven't run an auto in 30 years that wasn't a track box so kinda out of touch with the street side these days..
#20
On the manifold its been surfaced and is completely secure, had to use some washers that i trimmed since the new bolt holes are rather close to the runners.
AS far as the car goes Im ditching the auto and installing the gear set from 04 Civic Hybrid into a Fit case for VX/HF style gearing and also installing KPRO (not Flashpro) for E85 etc.
AS far as the car goes Im ditching the auto and installing the gear set from 04 Civic Hybrid into a Fit case for VX/HF style gearing and also installing KPRO (not Flashpro) for E85 etc.
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