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Old 2nd Jun 2006, 07:03   #1
Stonedofmoo
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Turbocharging the Honda CRX

My house mate has just picked up a CRX for a track car. The 1.6 engine puts out a healthy 130bhp but we feel it could use more for a track weapon.

We could either convert over to a 1.8 VTEC for around 180bhp or turbocharge the existing one.

My mate thinks you can buy kits that will fit and it will just work, however I glanced at the spec list and I didn't see anything about replacement engine management. Surely something would be required which would not cut the engine as soon as the turbo started producing positive pressure?

Any idea's?

Cheers
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Old 2nd Jun 2006, 07:24   #2
Simon
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You definately need management. The Ecu throws a code as soon as it detects boost. Standard Map sensor will go up to 11psi and with a chipped ecu you can run up to this much boost

My cousins 1.6 Honda engined Rover Coupe fitted with a T25 turbo made 185bhp /155lb.ft before it got written off.


XBL:RogadogUK. Zero torque but 9200rpm + 260hp
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Old 2nd Jun 2006, 09:15   #3
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im guessing its not the B16? are the regular ones D series engines?

the yanks prob have a wealth of info about it - but I would be tempted to drop a B18C into it and an LSD gearbox
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Old 2nd Jun 2006, 09:16   #4
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Quote:
Originally Posted by Simon
My cousins 1.6 Honda engined Rover Coupe fitted with a T25 turbo made 185bhp /155lb.ft before it got written off.
Is that Jonnycoupe? I thought he was your brother

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Old 2nd Jun 2006, 09:22   #5
Simon
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Quote:
Originally Posted by eidolon
Is that Jonnycoupe? I thought he was your brother
No Jonny did a 1.6 Vtec that was near on 230bhp, only lasted 10days though


XBL:RogadogUK. Zero torque but 9200rpm + 260hp
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Old 2nd Jun 2006, 11:28   #6
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From what i've heard (may be wrong) it probably is best to swap to a B18C4 AND boost it. It reputably responds the best to boost out of the B series engines due to lower compression than the others. Also the bent long second gear will probably assist traction in this case.

EDIT : Argh Managed to delete my original post whilst trying to quote it. So it may not all be above


If it's comfortable, then there's probably something wrong...
Last edited by Gayjin; 2nd Jun 2006 at 11:54.
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Old 2nd Jun 2006, 11:48   #7
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Quote:
Originally Posted by Gaijin
It reputably responds the best to boost out of the B series engines due to lower compression than the others.
They are still in the 10-11:1 range, far from low
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Old 2nd Jun 2006, 11:51   #8
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Quote:
Originally Posted by Gaijin
It reputably responds the best to boost out of the B series engines due to lower compression than the others.


If it's comfortable, then there's probably something wrong...
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Old 2nd Jun 2006, 11:55   #9
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i read your statement thanks,

but they are all so close to one another to make not that much of a difference.

If its just gonna be a track car, strip it to nothing and leave it at that.
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Old 2nd Jun 2006, 12:17   #10
eidolon
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Quote:
Originally Posted by Simon
No Jonny did a 1.6 Vtec that was near on 230bhp, only lasted 10days though
Now I'm really confused.
Is Jonny your brother and do you also have a cousin who turbo'd this VTEC engine too?

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Old 2nd Jun 2006, 12:32   #11
Simon
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Quote:
Originally Posted by eidolon
Now I'm really confused.
Is Jonny your brother and do you also have a cousin who turbo'd this VTEC engine too?
My bro had a coupe with VTEC B16. My cousin had the 1.6 DOHC non-Vtec engine in his coupe - same as the CRX mentioned, hence why I posted about it.

The B16 Vtec is nothing like the D16 Non vtec.


XBL:RogadogUK. Zero torque but 9200rpm + 260hp
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Old 2nd Jun 2006, 12:43   #12
eidolon
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aha, now I see.

You can see why I was confused though, not many people have 2 turbocharged Honda engine'd Rovers in their family!

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Old 2nd Jun 2006, 12:47   #13
Simon
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Quote:
Originally Posted by eidolon
aha, now I see.

You can see why I was confused though, not many people have 2 turbocharged Honda engine'd Rovers in their family!
Unfortunately both didn't exist at the same time and are now both in car heaven

180bhp and 5psi of boost are about your limit on stock engine. ARP head studs help stop the head lifting.


XBL:RogadogUK. Zero torque but 9200rpm + 260hp
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Old 2nd Jun 2006, 13:25   #14
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No point really to be honest.
If your gonna use it as a track car theres no point paying thousands(yes many many thousands) to get a properly running CRX Turbo.

Strip everything out of it and it should weigh 800kg, maybe less. I dont think iv seen a b18 go into a d16 car. Iv seen b16s go into d16 cars however.
Its not worth it unless hes unto track racing seriously. As if hes not it will all be a huge waste of money.


My penis, way more fun than BMW 330's
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Old 2nd Jun 2006, 13:29   #15
Simon
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Quote:
Originally Posted by Mic
No point really to be honest.
If your gonna use it as a track car theres no point paying thousands(yes many many thousands) to get a properly running CRX Turbo.
Won't even cost 400 if you can do it yourself.

Just need to buy a manifold, turbo and intercooler really


XBL:RogadogUK. Zero torque but 9200rpm + 260hp
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Old 2nd Jun 2006, 13:29   #16
merlin
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Agreed, strip it, sort the handling for the track and get on with it.
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Old 2nd Jun 2006, 13:30   #17
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Quote:
Originally Posted by Simon
Won't even cost 400 if you can do it yourself.

Just need to buy a manifold, turbo and intercooler really
& ECU?
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Old 2nd Jun 2006, 13:30   #18
Simon
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Quote:
Originally Posted by merlin
Agreed, strip it, sort the handling for the track and get on with it.
Prob best really.

A guy on CRX forums had a stripped white CRX with a bit of Nitrous. Was a right weapon and he could drive. Destroyed most things on a track


XBL:RogadogUK. Zero torque but 9200rpm + 260hp
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Old 2nd Jun 2006, 13:31   #19
Simon
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Quote:
Originally Posted by merlin
& ECU?
Just need the OE Ecu chipping. Jonnyboy does them pretty cheap (about 50)


XBL:RogadogUK. Zero torque but 9200rpm + 260hp
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Old 2nd Jun 2006, 13:32   #20
Mic
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Quote:
Originally Posted by Simon
Won't even cost 400 if you can do it yourself.

Just need to buy a manifold, turbo and intercooler really
What about the internals?
Would he be able to get enough boost on an non-uprated internals to compete with a vtec crx?


My penis, way more fun than BMW 330's
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Old 2nd Jun 2006, 13:33   #21
penski
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Quote:
Originally Posted by Simon
Won't even cost 400 if you can do it yourself.

Just need to buy a manifold, turbo and intercooler really

The boy has it right; Crack out the CDS, truck turbo, intercooler, saw and MIG kit!

*n
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Old 2nd Jun 2006, 13:34   #22
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Quote:
Originally Posted by Mic
What about the internals?
Would he be able to get enough boost on an non-uprated internals to compete with a vtec crx?
Go low-pressure, positive-displacement supercharger then - stock internals.

Grab me on emessen if you want a chat about it, dude

*n
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Old 2nd Jun 2006, 13:35   #23
djbenjo
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Lots and lots of info especially over in the states of how to boost both B and D series motors Good look and I expect a full write up with lots of piccies

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Old 2nd Jun 2006, 13:37   #24
Mic
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BANG!

LINKING IT UP A NOTCH!

http://www.turbod16.com/
Has to be the most relevant forum ever for this thread


My penis, way more fun than BMW 330's
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Old 2nd Jun 2006, 13:42   #25
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XBL:RogadogUK. Zero torque but 9200rpm + 260hp
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Old 2nd Jun 2006, 13:45   #26
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My cousins D16A9 with a T25 turbo DIY Turbo kit i built and tuned for him. Uses 345cc Prelude H22 injectors and std ECU chipped and remapped. 185bhp and 155lbft. New car he has a 2.5" exhaust and 220sx turbo, should make 200bhp pretty easy. Simons posted his dyno curve above.

Ive also done a guys Rover Coupe with a D16z6 around 6 psi of boost, 186bhp and 165lbft, agiant T25 from a 220turbo and has pretty awesome midrange torque, very fast on the road.

Another guy im helping tune his D16a6 'mini me' (std Rover SOHC block with SOHC VTEC head) has a Jackson Racing charger (Eaton M45) just running on a basemap at the mo (super conservative ignition and Rich AFR's)

Remember the engines run the opposite way so chargers are generally a pain in the ass to DIY



Will get that tuned and should have a flat line of 150lbft well past 7k so will make good power, now thats a nice road friendly power curve

All D series.

My old Red Coupe had the B16 DOHC VTEC with a Pulsar turbo that never got RR's was around 230bhp i imagine.
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Old 2nd Jun 2006, 13:51   #27
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Gah. I forgot that honda lumps spin cack-handed.

Hmm...

*n
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Old 2nd Jun 2006, 13:54   #28
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Most the kits fron yank land have crummy Fuel pressure regulators known as FMU's which really ramp fuel pressure up as boost increases the manifold pressure.

Then they put a check valve on the MAP sensor so it doesnt see boost, you get no ignition retard under boost then so have to retard the ignition via the distributor which effects the whole map, meaning off boost the car drives like a pig.

B series swaps are pretty common on CRX's

Check www.hondacrx.co.uk/forum plenty of awesome spec CRx's there. Glen (88crxturbo) runs a D16 turbo aswell knocking on the door of 200bhp. Whilst Mark punchards (now stolen recovered) white CRX 16v ran the std 130bhp engine with nitrous and then an awesome chassis/brake setup and alignment. At many action days at Combe ive seen his hustling the jap stuff and even getting past the Evo's, his corner speed was immense.

Fast circuit cars dont really need the big power engines, just well setup chassis's and modifications (including weight reduction) to give the performance.
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Old 2nd Jun 2006, 14:13   #29
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Posted on behalf of my housemate: -

At the end of the day I would like more power. Jonny I tried to get hold of you via a PM on the hondacrx forum. Would you mind dropping your mobile number to me on three.cross@lamportbassitt.co.uk

Just need a quick chat about a few things as I trust your judgement. I.E. I know you aren't a armchair expert like some people on forums

Cheers,

Kevin
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Old 2nd Jun 2006, 14:18   #30
merlin
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Quote:
Originally Posted by Jonnycoupe

Fast circuit cars dont really need the big power engines, just well setup chassis's and modifications (including weight reduction) to give the performance.
Aint that the truth. You can save massive amounts of time having the car quick around the bends.

A car that can move around quickly and deal with total direction change quickly will leave a car with twice the power for dead in no time at all.

Seen it time and time again - big bhp pulls away on the straights - gets reeled in on the bends.

Lightweight is the key.
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