1989 Honda CRX K20 track car.
Discussion
I have had this car a couple of years now ,so about time I stuck a few pictures up on here . its a 1989 Honda Crx , it originally set off as a D16 back in 1989 and raced in the original crx challenge in the early 90"s , fast forward 20 years and a few owners and it got a B16 transplanted, raced a couple of years and then upgraded to a B18C6 (DC2 motor) which is when I bought it .
I used it a year but felt the need to upgrade the motor which is where it all went wrong ,huge cams, hi compression and 56mm throttle bodddies , it made great power but engine was fragile at that level of tune and it eventually went bang
so last year I did a Kswap fitting the 2.0 k20 from the later civic EP3 , not a straight forward job on one of these as the engine is the total opposite way round B18 spins anti clockwise so gearbox on the wrong side so everything is to change .
previous build thread and videos on my instagram page; jeff_cooper_49
Spec at the moment.
1989 Crx 16v
shell extensively lightened
full roll cage with additional bracing added
plastic windows
sunroof removed
carbon fibre bonnet
weight 850kg (hopefully another 20kg to come out )
2001 K20A2 engine
TDI North drop in hi lift cams
Custom ported RBC inlet
70MM Skunk TB
custom intake
K&N filter
lightweight flywheel
Ktune TPS
3" exhaust
Mapped on Kpro ecu
260bhp.
6 speed Ep3 gearbox with custom short gear ratios, 134mph @ 8900rpm / 6th
Spoon Plate LSD
Ep3 shafts
Meister R shocks all round
Bespoke double front anti roll bar
Skunk camber adjusters
thicker rear anti roll bar
braced rear
Brembo Tocca spec 4 pot calipers / mintex race pads
standard rear brakes with brembo discs / mintex race pads
I used it a year but felt the need to upgrade the motor which is where it all went wrong ,huge cams, hi compression and 56mm throttle bodddies , it made great power but engine was fragile at that level of tune and it eventually went bang
so last year I did a Kswap fitting the 2.0 k20 from the later civic EP3 , not a straight forward job on one of these as the engine is the total opposite way round B18 spins anti clockwise so gearbox on the wrong side so everything is to change .
previous build thread and videos on my instagram page; jeff_cooper_49
Spec at the moment.
1989 Crx 16v
shell extensively lightened
full roll cage with additional bracing added
plastic windows
sunroof removed
carbon fibre bonnet
weight 850kg (hopefully another 20kg to come out )
2001 K20A2 engine
TDI North drop in hi lift cams
Custom ported RBC inlet
70MM Skunk TB
custom intake
K&N filter
lightweight flywheel
Ktune TPS
3" exhaust
Mapped on Kpro ecu
260bhp.
6 speed Ep3 gearbox with custom short gear ratios, 134mph @ 8900rpm / 6th
Spoon Plate LSD
Ep3 shafts
Meister R shocks all round
Bespoke double front anti roll bar
Skunk camber adjusters
thicker rear anti roll bar
braced rear
Brembo Tocca spec 4 pot calipers / mintex race pads
standard rear brakes with brembo discs / mintex race pads
leglessAlex said:
300bhp/ton? I bet that thing shifts. It looks great, I'd love to have one of these on the road.
cheers tbh its awful on the road, just about tries to kill you everytime you floor it with the plated diff and geo settings it runs, great on track though and yeh it does go very well . 
bit more tinkering going on. I have previously tried throttle boddies on this car with gains in power but I never managed to get the running right and the biggest issue was getting them to fit under the bonnet !
this is where I got too last time as can seen they were never going to fit without cutting half the bonnet away!!!
So , I want to get a set of ITBs to fit but I dont want to hack a huge hole in the bonnet and have a filter poking out and with the engine never been designed to fit in a Crx any manifold you but for a k20 engine is on the wrong angle so decided to have a go and make up my own, using an inlet manifold from a standard k20 engine to get the base plate to fit the head and I stumbled across a set of second hand Jenvey itbs on a manifold for a b18 C6 engine so I cut of the base plate and plan was just to weld the two together , the b18 has the same size ports as the k20 so on paper looked to be ideal later discovered that the spacing was wrong so had to modify to fit . had to spend a fair bit of time machining the inlet angle to get the angle that I was after and also had to heavily modify the idler pulley on the engine and then brace it up so it ended up a little more involved than I first thought ! photos prob make a bit more sense of what I was trying to achieve and how I have gone about it .
this is where I got too last time as can seen they were never going to fit without cutting half the bonnet away!!!
So , I want to get a set of ITBs to fit but I dont want to hack a huge hole in the bonnet and have a filter poking out and with the engine never been designed to fit in a Crx any manifold you but for a k20 engine is on the wrong angle so decided to have a go and make up my own, using an inlet manifold from a standard k20 engine to get the base plate to fit the head and I stumbled across a set of second hand Jenvey itbs on a manifold for a b18 C6 engine so I cut of the base plate and plan was just to weld the two together , the b18 has the same size ports as the k20 so on paper looked to be ideal later discovered that the spacing was wrong so had to modify to fit . had to spend a fair bit of time machining the inlet angle to get the angle that I was after and also had to heavily modify the idler pulley on the engine and then brace it up so it ended up a little more involved than I first thought ! photos prob make a bit more sense of what I was trying to achieve and how I have gone about it .
motorhole said:
Think I've seen YouTube videos of this going round Croft, including when the old motor went bang? Weapon!!
yeh that will be the one, spends a bit of time there as is my local circuit. this was in car of last time I was there few weeks ago was on the plemun and putting in some pretty healthy lap times on 1b road tyres ,
https://www.youtube.com/watch?v=juG8EYMDf9E
itbs fitted with carbon backplate and filter , bonnet vented for air feed.
Dropped off to be mapped, was hoping to do the next round of Time attack at oulton park but looks like I need to fit headlights, indicators , hazard lights , drivers seat and belts and a dash to comply with regs and suspect will run out of time as not sure when will get car back and its on the 9th .
Dropped off to be mapped, was hoping to do the next round of Time attack at oulton park but looks like I need to fit headlights, indicators , hazard lights , drivers seat and belts and a dash to comply with regs and suspect will run out of time as not sure when will get car back and its on the 9th .
dr_rallye said:
I like this, they are a nice shape and I remember thinking that they looked quite futuristic in their day. Not sure I've seen a red one before. Paint colour undoubtedly adds 5mph 
Bet it sounds good with that engine in once the VTEC (Yo!) kicks in. Any videos?
yeh It sounds pretty mental when it goes into Vtec on the Itbs. Bet it sounds good with that engine in once the VTEC (Yo!) kicks in. Any videos?
plenty of race and track vids.
rolling start to flat out testing on the Throttle boddies here https://www.youtube.com/watch?v=B_Z1PmyY_Qo
and at Croft before Itbs were fitted here https://www.youtube.com/watch?v=juG8EYMDf9E
Edited by JeffC on Wednesday 6th July 07:12
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