G1en Posted February 29, 2020 Author Share Posted February 29, 2020 Right, lets bring this upto date a little. So with the hillclimb season over it was time to see what I could spend some money on to get the car a step forward. All cosmetic enhancements went out of the window a while back so it was only functional upgrades from now. With the car handling about as good as it can get (well sort of, more on that later) the obvious other major consideration is power so still not having the budget or desire/worry for turbos I decided to put some high lift cams in so booked in at @Jez @ H-Dev in November. I smartly booked the MOT for the week before as apparently sport/race cams can make it very hard to pass an MOT, needless to say it did get through although one of the readings, can't remember which, was right on the limit for pass/fail which is probably to do with the cobra sports cats possibly degrading. So off I popped for the 200 miles to Horham and dropped off the car Tuesday and arranged to collect Friday. Now the list of Jobs I left them with was quite extensive and not known to me at the time was about to get even bigger. Many of you will know one of the very few flaws on the 350z HR motor is the dread oil gallery gaskets, so even though I have never had any issues with the oil pressure and the car is on around 70k it only seemed right that whilst the engine was apart, we may as well get the gaskets replaced with the uprated version for peace of mind, it also makes financial sense as the cost is minimal if the engine is stripped already. The great thing with trusted garage such as Horsham Developments is the guys ring you with updates as they are going along especially if they hit any snags/issues. The gallery gaskets in the main were still ok, which is obviously why my pressure has been fine to date but Craig did say one part had broken loose and over time would have failed so like many HRs, they WILL need doing at some point even if you have an unblemished service record. This was mine below: I also decided to purchase an uprated fuel pump, even though not required because I wasn't going Forced induction, for peace of mind and to keep my credit card busy I insisted anyway as the existing pump was now almost 12 years old and after reading up on it, the oem pump is surprisingly small/low pressure, whatever the correct terminology is. I think (but don't quote me) the standard fuel pump is 90 l/min where as the uprated one Horsham offer is something like 210-250 l/min so again, it just means peace of mine and I am not gonna have a lack of fuel when thrashing it on track. So next on the build list was hardrace engine mounts, now for the last few months I have experienced a lot of juddering or wheel hopping when setting off that I put down to worn engine mounts or because most parts underneath were polybushed and I already had the hardrace gearbox mount, I assumed this was the last sloppy piece in the jigsaw, it was only when they got it up on the ramp that they told me the likely real cause. The front ultra racing strut brace (not the w brace) that I replaced last year had been hit/bent so many times (due to the car being so low, me going off track and bottoming out over humps/bumps) that 2 of the 6 fixing bolts had sheered off and the 2 banana arm poly bushes either side had been ripped out of the arms, this may well explain the progressive vaugeness in steering I had put down to wear and tear (turns out it was quite literally wear and tear) So added to the list of jobs was new banana arm poly bushes and a new front brace, OEM this time sourced speedily from @ZMANALEX as its much stronger and a full alignment required. I also asked them to raise the front coilovers as much as they could and lower the rear slightly. I had always been under the impression they were on the maximum height but it turns out they were kind of in the middle of the adjustment range so we were able to raise the front suspension around 20mm and lower the rear around 10mm which has made a big difference to front clearance for speed humps and now the car sits kind of level rather than raked lower to the front which should also help me get off the line as the centre of mass will move slightly rearwards (if you ever watch old rallying with the escorts you will notice the rear end is always squatted lower to the ground for traction) So, finally, all the routine yearly service tasks were carried out, new titan race oil, new coolant, new diff oil, and its was aligned to my request, the few bumps and scrapes over the year had knocked the alignment out slightly so its always best to get it done every year. we went for the maximum the camber arms would give us on the front (-2.5) It was -3 at some point in the past but raising the suspension means you take off camber, conversely, lowering a car adds camber, not teaching anyone to suck eggs. and -1.5 on the rear with neutral toe, as I have mentioned before, I find this is a good neutral setup for my driving style and having a square tyre setup eliminates a lot of the terrible understeer the standard car offers. Onto the dyno, now Horsham were disappointed with the results and they think a CAT may be degraded/blocking some of the exhaust gases, this may well be the case as it keeps throwing up the same EML light periodically which is O2 sensor 1 &2 Bank 1 but I don't have the time/money to sort the exhaust so that's something for future, it could also be the manifold but its not major as it did make 10bhp over last time which was 2 years ago. They did not have a start point as apparently with new cams you can't do a base run/before run as you need to download different things to ecu or it runs like a pig. so we are basing this against last dyno printout, previous in this build thread which as stated is 2 years ago, the car may have naturally lost some power since then, who know, I know I have never changed the K&N air filters so that may restrict the airflow, anyway, we still got an improvement at the top end which is where I need it for track driving and it seems obvious the Tomie cams are working as the power is still there/increasing at red line. Its hard to tell whether I will see any actual time improvements (watch this space) but the sound at WOT is proper race car now and amazing. shame I cannot de-cat the exhaust because of hillclimb regs (and general mot regs!) as it would sound even better and release even more power (another reason the gains had been low) all the cars previously dyno with high lift cams had been de-catted and uprated cold air intakes for breathing, so although slightly disappointed, I know I can certainly get more power down the line if I sort out the intake and exhaust. Coming next, I attempt to paint the front bumper plus other TLC jobs on the car. 3 Quote Link to comment Share on other sites More sharing options...
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