My K20 Integra DC2 track car

[Lee91]

Ah cool it's good to put a face to a name on here

How's the car going, did you get the engine into the car to start running it in? Should be good when mapped!

No, the engines just sitting in the shed now for another few months, the cars a while off being ready for an engine. Not much running in needed really it only got a new Headgasket and a few seals. Looking forward to getting back down to Aonghus for a tweak once I put it back together again.

 

[t3gav]

What power did it make with the cams in?

 

[SPek9]

Thought I would update the Integra track car thread, took a trip down to Mondello on Friday and had a great day out with the Octane trackday. I was testing out new suspension and still need some adjusting to get them feeling right, car ran great all day and always puts a smile on your face when out on track

 

[SPek9]

Heres a clip from one of my sessions out on Friday, 2nd time on the track so still a lot to learn about the quickest lines through most of the corners

 

[olly]

Looks tough! What suspension are you running now then?

 

[SPek9]

Looks tough! What suspension are you running now then?

Using Yellowspeed 2-way dampers now and I think I have too much bump and not enough rebound, the car was very bouncy and hard to keep in a straight line

 

[Eoghain]

if you had too much bump it would be trying to skip sideways on you in the corners, its hard to tell because of the camera moving but it looks pretty planted. The purposing front to back looks very annoying, kinda suggests its a imbalance front to back! have you the back alot softer than the front?

i think you might just have the two settings too far apart. Like you say,more rebound, but dont remove any bump until the rebound is up and you've tested it. I've 4 way intrax on my integra which allows the fine tuning of high and low speed bump which is very handy!

Class car by the way, have you any modifications done to the gearbox? And what kinda power is the car making?

 

[SPek9]

if you had too much bump it would be trying to skip sideways on you in the corners, its hard to tell because of the camera moving but it looks pretty planted. The purposing front to back looks very annoying, kinda suggests its a imbalance front to back! have you the back alot softer than the front?

i think you might just have the two settings too far apart. Like you say,more rebound, but dont remove any bump until the rebound is up and you've tested it. I've 4 way intrax on my integra which allows the fine tuning of high and low speed bump which is very handy!

Class car by the way, have you any modifications done to the gearbox? And what kinda power is the car making?

That makes sense and it's good to speak to someone who has a bit of experience with higher end dampers, all I have used in the past are basic 1-way so I have only been guessing really after a small amount of reading

My spring rates are 18k front and 16k rear.

It is hard to tell by the video but the car bounces up and down mid corner on the very long 4th gear right hand turn at the far end of the track, it also bounces a good bit up the main straight.

After a bit of reading last night a guide was to have the compression set between 50% and 75% of the rebound setting. I think I have mine set nearly opposite to that which may be the problem?

Also what do you mean by purposing front to back?


The gearbox is a UK k20 with a 5.1 FD and a plated LSD. I'm considering the JDM 4th - 6th gears since I spend most of the time going from 3rd to 4th and some 5th. I would probably need 6th for my local track Kirkistown
The car is making 250bhp 186ft.lbs

 

[Eoghain]

spring rates sound ok

Porpoising i ment to say, that the car seams to bounce front to rear like in a seesaw motion pivioting through the middle of the car! That will effect traction and could upset braking! i noticed it on the straight alright, what setting have you the dampers at on the front and the rear? What spring rates had you with the previous set up? Does the car roll much?

Sounds like i am building a car very similar to yours! The car in my avatar i bought as a rolling shell came with intrax dampers, alcons front and rear, ATL fuel tank and a few other carbon goodies, i'll put up a build thread once i have the shell back from paint! I just bought an english EP3 to rob the engine and box out of it, i've been looking at the m factor gear kit for my car. Aonghus was telling me about your car but i couldnt get the day off work to go to mondello to check it out!

 

[SPek9]

spring rates sound ok

Porpoising i ment to say, that the car seams to bounce front to rear like in a seesaw motion pivioting through the middle of the car! That will effect traction and could upset braking! i noticed it on the straight alright, what setting have you the dampers at on the front and the rear? What spring rates had you with the previous set up? Does the car roll much?

Sounds like i am building a car very similar to yours! The car in my avatar i bought as a rolling shell came with intrax dampers, alcons front and rear, ATL fuel tank and a few other carbon goodies, i'll put up a build thread once i have the shell back from paint! I just bought an english EP3 to rob the engine and box out of it, i've been looking at the m factor gear kit for my car. Aonghus was telling me about your car but i couldnt get the day off work to go to mondello to check it out!

I've just checked and I had the dampers set the same front and rear, out of 33 clicks I was 12 clicks off hard rebound front and rear and about the same for Compression. The car doesn't seem to roll much. I was using 16k front and rear before

I understand what you mean now and the car does seem to bounce front to rear a bit which it didn't do before with the old coilovers so it must be in the setup


That rolling shell you bought has some very nice parts with it! I look forward to seeing your progress with the car, what were you planning to do with the car when it's built? The Mfactory kits are very good, I would consider them myself
Ah right cool, Aonghus was supposed to call down too but he had trouble with a rally car that he was mapping and had to work Friday to try and get it sorted

 

[Eoghain]

First thing i would do with your car is put the stiffer springs in the rear so, wind up the redound on the front another 4-5 clicks soften the rear compression 4-5 clicks too. This will be such a dramatic change it will either feel alot better or a bit worse. You'll know which way to go from there. If the car is alot more settled but a bit stiff after that soften off all the adjusters the same amount to lower the overall damping. The one thing i cant really get my head around is your apparent bump steer on the bumpy sections of the track, are you getting alot of suspension travel with these coilovers?

I plan on doing everything the car will be able to do, track days, ITCC, hillclimbs, time attack, and i'd also love to do a few rounds of the vtec challenge in england at some stage!! Ya the m factory kits arent too badly priced, they have two different ratio 6th gears too.

Did the car gain much torque and power with the Titan throttle bodies? they look a nice bit of kit!

 

[SPek9]

First thing i would do with your car is put the stiffer springs in the rear so, wind up the redound on the front another 4-5 clicks soften the rear compression 4-5 clicks too. This will be such a dramatic change it will either feel alot better or a bit worse. You'll know which way to go from there. If the car is alot more settled but a bit stiff after that soften off all the adjusters the same amount to lower the overall damping. The one thing i cant really get my head around is your apparent bump steer on the bumpy sections of the track, are you getting alot of suspension travel with these coilovers?

I plan on doing everything the car will be able to do, track days, ITCC, hillclimbs, time attack, and i'd also love to do a few rounds of the vtec challenge in england at some stage!! Ya the m factory kits arent too badly priced, they have two different ratio 6th gears too.

Did the car gain much torque and power with the Titan throttle bodies? they look a nice bit of kit!

A few regular Honda drivers from Mondello have said to me about using a spring stiffer on the rear compared to the front. Have you tried this setup yourself and how does the car handle, is it not to stiff at the rear seeing the rear is a bit lighter? Also is the car stable at high corner speeds? We have a 130mph left hand corner at Kirkistown

The bump steer is a strange one, maybe the diff was kicking back a bit at lower revs through that long right hand turn, maybe it was because the rebound was too fast. With the compression wound up too much I don't think I was getting much travel TBH

Do you run much camber or toe out around Mondello? I have stuck with about -3.5 front, -3 rear and close to zero toe for now

Excellent, I have gathered up most of the things I need to start racing so plan to do something similar to you and NI saloons rather than ITCC.

With the ITB's you won't gain more than a couple of peak HP over an RBC and a good Intake setup but what I gained was a bit of torque which starts a lot sooner in the revs now, a broader torque curve, bit of mid range and a load more response. They are also a good bit lighter than an Intake manifold and air filter setup

 

[Eoghain]

I haven't tried that Spring set up myself but it's the way my dampers and springs are at the minute! It's for killing understeer and it was common enough in the btcc, on cold tyres I'd say it'd be lively enough!!

I doubt it's the diff, especially down the straight!! It must be a damper set up issue!!

Do you use bushings or rose joints in your wishbones? This will effect what way the toe settings should be in my experience! I'll be honest this is my first experience of track racing, however I have built and ran high spec Honda rally cars for years. So set up wise I can't be very specific about alignment!

I actually got a quote for Titan bodies and was surprised how reasonable they are compared to buying the likes of a skunk 2 ultra manifold and throttle body!

 

[SPek9]

I haven't tried that Spring set up myself but it's the way my dampers and springs are at the minute! It's for killing understeer and it was common enough in the btcc, on cold tyres I'd say it'd be lively enough!!

I doubt it's the diff, especially down the straight!! It must be a damper set up issue!!

Do you use bushings or rose joints in your wishbones? This will effect what way the toe settings should be in my experience! I'll be honest this is my first experience of track racing, however I have built and ran high spec Honda rally cars for years. So set up wise I can't be very specific about alignment!

I actually got a quote for Titan bodies and was surprised how reasonable they are compared to buying the likes of a skunk 2 ultra manifold and throttle body!

I would say you are right about the car being lively with a stiffer rear Spring. One thing to mention is that I run 210 wide 16" tyres front and 200 wide 15" tyres rear so I may not need to have the spring bias towards the rear. A lot of Japanese FWD time attack and circuit cars still run a slightly softer rear spring and then dial out understeer with staggered tyres but I've read that they also use adjustable rear ARB's

Your right, once you add up a high end intake manifold, TB and air filter kit it's not far off the Titan ITB's. ITB's take a bit more work to setup and tune as you know but I think they are worth the response, broader torque and the noise alone!

Aonghus is also the only man for the job and has plenty of experience with them so have a good chat with him before deciding anything. I think he's still pleased with a good plenium setup when he seen that there wasn't big gains but when you drive the car you will understand the difference in a track situation

 

[Eoghain]

Are you using the 210 Yokohama or hankook? Some of the mad whores in the itcc run mental rear camber, toe out on the rear and stiffer springs for turn in!

Ya I'll be getting Aonghous to build up the engine for me, he's done mapping for me on different cars in the past! The Titans are 50mm butterfly, and by right a 52-54mm butterfly is what you want on a k series but those kinsler throttle bodies are a MAD price!

What's your next day out in the car?

 

[SPek9]

Are you using the 210 Yokohama or hankook? Some of the mad whores in the itcc run mental rear camber, toe out on the rear and stiffer springs for turn in!

Ya I'll be getting Aonghous to build up the engine for me, he's done mapping for me on different cars in the past! The Titans are 50mm butterfly, and by right a 52-54mm butterfly is what you want on a k series but those kinsler throttle bodies are a MAD price!

What's your next day out in the car?

I'm using the Hankook slicks because they are the best priced TBH

The ITCC drivers are doing well with the cars that lively at the back, I've seen a few races on video and they all go really well but some look like a real handful!

Do you think that the Titan with the 50mm butterfly would be designed for better response and drivability on and off the throttle compared to the likes of the bigger Kinsler body's which are more suited to drag racing applications and more peak hp?


I haven't thought about when to take the car out next, I still haven't got my race licence yet so until I do I have the choice of Time attack, Rallysport or trackdays. I might even do a trackday at Kirkistown next Month to try and sort the suspension out with a bit of trail and error

 

[Eoghain]

the k20 engine can flow so much air through it with high compression and uprated cams that 50mm defo isnt over kill, to be honest i'm thinking of going with the titans myself for my car!

defo worth getting out soon to dial in the car more!

 

[SPek9]

I made a few changes to the car recently so I made the trip back down to Aonghus @Vtec6000 at AP-Performance to have the car tuned on Friday. As always Aonhgus did a fantastic job on the map and his attention to detail is second to none so the car is going even better now!

There was a trackday on Sunday so I took the car out on a slightly damp track using semi slicks and the car felt great after a few changes to damping and rebound. The M3 in the vid is an e36 EVO lightened with 1 seat, well setup suspension and a driver who doesn't hold back so we have good fun on track together