Trevor, I will be sticking with the FJ power plants. Construction on a new engine is about to get started. This should be a hell of an engine once finished - but due to cost it will take about 6 months to complete.
Budget for this engine is $10k, including quad throttle body infection, Autronic computer and dry sump set-up. Internally, we plan to do some experimenting with porting on an old head, also we will experiment with different size valve combinations - as normally if bigger valves are installed they hit each other - we'll see what happens. Bottom end - JE pistons (custom made), lightened, balanced crank, lightened and balanced Nissan Group A rods (ex Gibson motorsports). Compression 12.5:1 Redline = 9,000 rpm with expected gear change at 8,500rpm. Oh, yeah huge cams and competition springs from Japan. Should be a screamer! Mark ----- Original Message ----- From: "Greg" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Monday, April 08, 2002 6:41 AM Subject: RE: What size wheels are best? > Listers, > > Take note, some very good tech info from Errol, Andrew and Nick here (even > with The <crap on> bit). This has been something I have been looking into > for some time and settled on 13 X 7 wheels and 205/50 racing slicks. I > bought some ENKIE's from a nice bloke in NT ($200 on ozdat classifieds). > They weight 5.5Kg without tyres and with tyres shouldn't be much over > 10-11kg. Compared to other wheel tyre combos I have access to this is good. > 14x5.5 early skyline wheels with 195/60 A032 Advans were 15kg. 15x7 Cheviots > were 16.5kg with 205/50 Kelly tyres. > > Mark when I weight up the cost benefit of your application I would look for > some lighter wheels as from memory the hotwires (are you still running > these?) were a bit heavier than the ones I have bought (sorry don't have all > the data with me). > > As for the brakes I will be the first one to put up my hands if you want to > sell them. Attention to brake compound and ducting is the go here. If you > can fit a lighter alloy calliper with the same or more piston area, that > would help the handling but considering cost benefit it is not worth it. In > any case from what you told me when you were last in Melb your car has > awesome handling... and brakes is suspect. > > As you said somewhere below the FJ is not powerful enough. I would be > sticking my money into a SR20 DE. A local mk1 escort sports sedan with 48mm > webers and cams makes an easy 230hp. This should keep you near the front of > the field. > > Regards > Trevor Pooley > > If your quicker around oran park with 14's then I'll eat my words. > > > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED]]On Behalf Of Mark Alford > Sent: Friday, 5 April 2002 9:37 AM > To: [EMAIL PROTECTED] > Subject: Re: What size wheels are best? > > > Ken - thanks for your thoughts, > > When you say "quite wide rims" what size are you thinking of? I am > currently running the widest rims I am allowed to run - 7" > > Compound is not an issue - we have to run a control tyre - Yokohama A032 > > As for brakes - I am lucky that I have a four spot Calliper that will fit in > a 13" rim. Trust me when I say I hammer the brakes, due to lack of > horsepower (at the moment) I try to make up for it under brakes and through > the turns - suspension is well setup. I recently pulled the rotors off, and > they actually have a blue tinge to them - so I guess they are getting pretty > warm. Perhaps the fact that I have a decent size vented rotor, run good > pads, and change my brake fluid regularly (Castrol SRF) all helps? > > Thanks again for your feed back. > > Mark. > > > > ----- Original Message ----- > From: "Ken Abraham" <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]> > Sent: Thursday, April 04, 2002 8:24 PM > Subject: Re: What size wheels are best? > > > > Mark, > > > > The following statements are unproven, untenable, and indefensible:) > > > > </crap on> > > > > You'd need very wide rims to stretch the sidewall of your 205/60-13's > enough > > to get the best performance out of them. > > If you don't stretch them them flex in the sidewalls will give bad driver > > feedback and will heat up the tyres faster. > > Because the 14's are slightly narrower, but still have the same aspect > ratio > > (60%) the sidewalls will be shorter. So you could use quite sensible rims > > and still stretch the sidewall. > > > > You also have a benefit of being able to use a softer compound since they > > are easier to set up better. ie the 14's won't heat up as quickly as the > > 13's > > > > The wide, but short, contact patch of the 205/60-13's would be more > > sensitive to camber change (bumps, dynamic or steady state cornering etc). > > The Semi-trailing arm rear-end and MacPherson strut front-end are not very > > precise suspension methods and suffer from lots of camber, castor, scrub > and > > toe change > > > > The 195/60-14 tyres are narrower (obviously). This doesn't mean that there > > is less rubber on the road as the increased rolling diameter means the > > contact patch, whilst narrower, is also longer than for the 13's. This > long > > and thin contact patch is less sensitive to camber changes. > > > > The other, and main, benefit of 14's is the increased room for brakes and > > brake cooling. > > If you are not getting brake fade you probably aren't going hard enough :) > > Seriously, it really depends on the car, track, budget and driver so I > can't > > really say anything useful here. > > > > 14's will increase the ride height of your car, you would have to lower it > > again to get back the CofG and this would cause the suspension geometry > > front and rear to get worse.ie going to 14" requires suspension geometry > > changes. > > > > You can't really compare your car to an F1 car as F1 cars have effectively > > zero suspension movement and the tyres are the only actual deflecting > > element. > > > > All high performance and competition saloon cars go for the biggest wheel > > and lowest profile tyre that is allowable. This gives more room for brakes > > and reduces sidewall flexing (which generates heat) so that they can run a > > softer compund and the driver can get better quality feedback. > > </crap off> > > > > PS When the flag drops and the bullshit stops, how do you go when you race > > together? Is he faster down the straights, say, and you are better under > > brakes and quicker through certain turns ? etc... > > If he is particularly faster through a bumpy corner, or if your > performance > > drops off, relative to his, as the race progresses, I'd suspect the tyres. > > > > Regards, > > Nick > > ----- Original Message ----- > > From: "Mark Alford" <[EMAIL PROTECTED]> > > To: <[EMAIL PROTECTED]> > > Sent: Thursday, April 04, 2002 5:16 PM > > Subject: Re: What size wheels are best? > > > > > > > Andrew, > > > > > > Needless to say, he runs 14" wheels and we are usually pretty close when > > it > > > comes down to lap times etc. Also, I think nearly everyone else runs 14" > > > wheels, but that doesn't mean they are all right! > > > > > > He has a number of points - some of them I find difficult to swallow, > > others > > > have some credence. > > > > > > 1) Run 14" wheels and let the torque (I run an FJ - which is very > torquey) > > > pull the car out of the corner with the 14" wheels. - my argument is > that > > I > > > could change diff ratios if that is what I wanted to achieve. > > > > > > 2) 14" rim will have a larger outer diameter, therefore more rubber - > > which > > > in turn means the tyres will not get as hot because you are using more > > > rubber to do the same task. (I think he's clutching at straws here!) > > > > > > 3) 195/60 will have a smaller side wall than a 205/60 - which is true. > > > But.....the 205 is only a 13" when the 195 is a 14" therefore won't they > > > pretty much cancel each other out or at least the contact patch of the > 205 > > > must be worth something here? > > > > > > 4) The whole bigger brakes argument - my opinion there is that I am > > already > > > out braking other people so why would I need bigger brakes? I am running > > > four spots with a 260mm vented disk up front, with disks in the rear > > also - > > > stops pretty good! > > > > > > He had some others also, but they were a bit left of field and/or he > > didn't > > > have a good explanation as to why. I'm all for taking advise, hence I > > posted > > > this message, but I don't like to change things simply on someone's > word - > > I > > > like to know why, and so far, no one has managed to show me why 14" > wheels > > > will give me a better package than what I already have, or will bring my > > lap > > > times down any further. > > > > > > Cheers, > > > > > > Mark. > > > > > > ----- Original Message ----- > > > From: "Andrew Greenbury" <[EMAIL PROTECTED]> > > > To: <[EMAIL PROTECTED]> > > > Sent: Thursday, April 04, 2002 4:49 PM > > > Subject: Re: What size wheels are best? > > > > > > > > > > Hey Mark, > > > > > > > > No worries - what is the view of the guy you have been having a > > > > long running discussion with?? > > > > > > > > > > > > > Cheers Andrew, I appreciate the feedback. > > > > > > > > > > So far nothing has been said to make me think that 14's are the way > to > > > go. > > > > > This justifies what I have been telling myself for ages, just needed > > > some > > > > > other opinions to confirm it. > > > > > > > > > > Thanks to all who have replied. > > > > > > > > > > Mark. > > > > > > > > > > P.S. If any one thinks that 14's would be the way to go, I would > still > > > like > > > > > to hear why. > > > > > ----- Original Message ----- > > > > > From: "Andrew Greenbury" <[EMAIL PROTECTED]> > > > > > To: <[EMAIL PROTECTED]> > > > > > Sent: Thursday, April 04, 2002 4:20 PM > > > > > Subject: Re: What size wheels are best? > > > > > > > > > > > > > > > > Hi Mark, > > > > > > > > > > > > yeah I agree with Errol for the same kind of reasons esp in your > > > > > > racing context. Your rubber choice is greater, and you already > have > > > > > > the 13s. > > > > > > > > > > > > Rotational inertia is proportional to mass*radius^2, so the > > > > > > distribution of mass around the wheel has a greater effect than > the > > > > > > overall weight itself. The lower the inertia the less torque/force > > > > > > required to accelerate (and brake) the wheel. Also the wheel will > > > > > > accelerate/brake faster. > > > > > > > > > > > > Because of this as Errol said, bigger rims also require bigger > > > > > > brakes, but bigger brakes add more rotating mass etc etc. > > > > > > Generally, larger diameter tyres weight more too, and this mass > > > > > > has the largest radius. > > > > > > > > > > > > >From a handling point of view, the 13s give you a wider contact > > > > > > patch and a larger grip envelope. Because you have to keep the 60 > > > > > > profile, the difference in sidewall thickness should be similar as > > > > > > Ben mentioned, so you would expect the cornering stiffness of both > > > > > > sizes to be similar. The perception of the lower the profile the > > > better > > > > > > the performance isnt always the case - what size tyres do F1 use? > > > > > > > > > > > > Andrew > > > > > > > > > > > > > Ok Errol, > > > > > > > > > > > > > > I currently have the 13" wheels. Brake wise I am running a set > of > > > > > > > four piston sumitomo callipers. These callipers are apparently > > > > > > > works Nissan Callipers from an older model Japanese 300ZX. The > > > > > > > Callipers are not alloy, and are quite weighty. The disc is of > > > > > > > unknown origin (came with the car) but is 260mm diameter and is > > > > > > > vented. > > > > > > > > > > > > > > This setup works very well in it's current configuration. If > > > > > > > however, I was to go to 14" wheels, what size rotor and which > > > > > > > Callipers would you recommend? > > > > > > > > > > > > > > Also, from a handling point of view, would the 14" wheels > provide > > > > > > > better handling? Keeping in mind I still have to run the 60 > series > > > > > > > tyre, and would be forced to run a 195 as opposed to the > 205/60/13 > > > > > > > I am currently running? > > > > > > > > > > > > > > What do you think? > > > > > > > > > > > > > > Mark. > > > > > > > ----- Original Message ----- > > > > > > > From: E Smith > > > > > > > To: [EMAIL PROTECTED] > > > > > > > Sent: Thursday, April 04, 2002 11:43 AM > > > > > > > Subject: RE: What size wheels are best? > > > > > > > > > > > > > > > > > > > > > Its also a matter of moments and braking toque. Assuming the > > > > > > > same caliper and applied pedal force in every condition: - > > > > > > > > > > > > > > The larger the rotational diameter of the wheel/tyre, the disc > > > > > > > required must be proportionally larger diameter to maintain the > > > > > > > same braking effort. > > > > > > > > > > > > > > > > > > > > > > > > > > > > The classic wheel size example is the "EVO mock up" lancer > with > > > > > > > the 9" discs inside 18" wheels and they wonder why they will not > > > > > > > stop. I have a feeling that a lot of accidents recently have > been > > > > > > > caused by these mismatches of tyre - wheel / brake - caliper > > > > > > > combinations. > > > > > > > > > > > > > > > > > > > > > > > > > > > > I personally like 13 X 7" rims as the range of rubber is > better > > > > > > > for this size wheel, from treaded competition tyres to slicks. > > > > > > > They are also usually lighter. The next size up is 15" rims to > > > > > > > get a good selection of rubber. As the diameter goes up though > so > > > > > > > does the price. > > > > > > > > > > > > > > > > > > > > > > > > > > > > Cheers > > > > > > > > > > > > > > Feral Errol > > > > > > > > > > > > > > > > > > > > > > > > > > > > -----Original Message----- > > > > > > > From: [EMAIL PROTECTED] > > > > > [mailto:[EMAIL PROTECTED]]On Behalf Of Mark > Alford > > > > > > > Sent: Thursday, 4 April 2002 9:26 AM > > > > > > > To: Ozdat discussion list > > > > > > > Subject: What size wheels are best? > > > > > > > > > > > > > > > > > > > > > > > > > > > > Hey listers, > > > > > > > > > > > > > > > > > > > > > > > > > > > > I have been having a long running discussion with a guy I race > > > with > > > > > regarding wheel sizes, and what size wheel is best to run. I thought > I > > > might > > > > > throw the question open to the list and see what thoughts are out > > there. > > > > > > > > > > > > > > > > > > > > > > > > > > > > What I would like to know is - What size (diameter) wheel is > > > > > > > best to run? the choice is between two sizes 13" and 14" (both > > > > > > > with 7" width). Something else that also needs consideration is > > > > > > > the tyre that I must run. If I run the 13" I can use a 205/60. > If > > > > > > > I run the 14" I must run a 195/60. (Everyone must use a 60 > series > > > > > > > tyre) > > > > > > > > > > > > > > > > > > > > > > > > > > > > So who out there has some thoughts on which combination I > should > > > run? > > > > > I would also like to know the reasons behind peoples thoughts. > > > > > > > > > > > > > > > > > > > > > > > > > > > > I look forward to the feedback. > > > > > > > > > > > > > > > > > > > > > > > > > > > > Mark. > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > --membersozdat------------------------------------------------------- > > > > > > > OZDAT Mailing List Please Note:- > > > > > > > Send (un)subscribe requests to [EMAIL PROTECTED] > > > > > > > Send submissions to [EMAIL PROTECTED] > > > > > > > No unauthorised redistribution of this email > > > > > > > http://www.ozdat.com/ozdatonline/index.htm > > > > > > > http://www.ozdat.com/ozdatonline/listindex.html > > > > > > > http://www.mail-archive.com/[email protected]/ > > > > > > > > --------------------------------------------------------------------- > > > > > > > > --membersozdat------------------------------------------------------- > > > > > > > OZDAT Mailing List Please Note:- > > > > > > > Send (un)subscribe requests to [EMAIL PROTECTED] > > > > > > > Send submissions to [EMAIL PROTECTED] > > > > > > > No unauthorised redistribution of this email > > > > > > > http://www.ozdat.com/ozdatonline/index.htm > > > > > > > http://www.ozdat.com/ozdatonline/listindex.html > > > > > > > http://www.mail-archive.com/[email protected]/ > > > > > > > > --------------------------------------------------------------------- > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > --membersozdat------------------------------------------------------- OZDAT Mailing List Please Note:- Send (un)subscribe requests to [EMAIL PROTECTED] Send submissions to [EMAIL PROTECTED] No unauthorised redistribution of this email http://www.ozdat.com/ozdatonline/index.htm http://www.ozdat.com/ozdatonline/listindex.html http://www.mail-archive.com/[email protected]/ ---------------------------------------------------------------------
