thehelix112 Posted February 9, 2006 Share Posted February 9, 2006 Guys, Just thinking out loud at this point but I was wondering if anyone has adapted a jerico 4-speed to an L28 before? I can get my hands on ex nascar boxes for a relatively good price so was contemplating a dog kit, sequential shifter for the next stage of my zed. Anyone have any comments/experiences with Jericos? Dave Quote Link to comment Share on other sites More sharing options...
homerneedspeed Posted February 9, 2006 Share Posted February 9, 2006 if ti has dog rings don't plan on driving it on the street and plan on having out of the car every 1500 miles or so to replace the cracked dog rings which are about 150-300 a piece. if ti is for a race car then the only hassle would be replacing the dog rings, with rally cars you do this at every rally or two but it is part of the maintnence. Quote Link to comment Share on other sites More sharing options...
thehelix112 Posted February 9, 2006 Author Share Posted February 9, 2006 Thats the sort of information I want to hear, thanks. But are you talking about all dogs in general? Or jericos specifically? And I have been told previously that the dog's wear can be minimised by still clutching changes, and that if this is done they will last almost as long as a synchro'd box? Oh and yes, this is for a race car. So 1500 miles is really quite a long time and acceptable. Dave Quote Link to comment Share on other sites More sharing options...
preith Posted February 9, 2006 Share Posted February 9, 2006 This GT2 tube frame car has a Jerico 5-speed mated to the 'ole 28. I beleive most of the 300zx GT2, ex L28 powered cars had the Jerico trans before they went to the v6. http://race-cars.com/carsales/other/1062560599/1062560599pw.htm Quote Link to comment Share on other sites More sharing options...
rc's240z Posted February 9, 2006 Share Posted February 9, 2006 I would contact Taylor engineering. They modify 280ZX T-5 transmissions to run different gear sets and are really race tough once modified...A great race solution and legal for most race groups because you are not changing the stock housing. Down side is the cost, about 3k when it is all said and done. Quote Link to comment Share on other sites More sharing options...
preith Posted February 9, 2006 Share Posted February 9, 2006 I would contact Taylor engineering. They modify 280ZX T-5 transmissions to run different gear sets and are really race tough once modified...A great race solution and legal for most race groups because you are not changing the stock housing. Down side is the cost, about 3k when it is all said and done. I was going to suggest that as well, but his question was directed towards Jerico's only. Houseman is another vendor which modifies stock boxes, or maybe only the Datsun comp ones, to a dog ring style. http://www.housemanautosport.com/ Quote Link to comment Share on other sites More sharing options...
dj paul Posted February 9, 2006 Share Posted February 9, 2006 sorry for the offtopic question but what is the filter on the thing after the fuel pumps? http://race-cars.com/carsales/other/1062560599/1062560599pj.htm and what are dogring style trannys? i have no clue about transmissions, its one thing i need to learn. do they just allow quicker shifts but with more wear due to not having the syncros? or lighten up the rotating assembly of the gears for better power to the wheels? Quote Link to comment Share on other sites More sharing options...
boodlefoof Posted February 9, 2006 Share Posted February 9, 2006 I was also contemplating a dog engagement transmission with straight cut gears... but the price is kind of prohibitive. Also, the wear factor is a pain. If I were to go with one though... it would be the 33G from Quaife. www.quaifeamerica.com (click transmissions). Quote Link to comment Share on other sites More sharing options...
preith Posted February 9, 2006 Share Posted February 9, 2006 sorry for the offtopic question but what is the filter on the thing after the fuel pumps? That's just a breather tank, or catch can, to prevent any differential fluid from dropping on the track. Many, if not most, race sanctioning bodies recomend, or require them. and what are dogring style trannys? i have no clue about transmissions, its one thing i need to learn. do they just allow quicker shifts but with more wear due to not having the syncros? or lighten up the rotating assembly of the gears for better power to the wheels? Looks like you answered your own question. Yes, they're basically a non-synchronized transmission which enables quicker gear changes, higher reliability (without the possibility of synchros breaking) but at the expense of higher maintenance (replacing the dog rings). Quote Link to comment Share on other sites More sharing options...
thehelix112 Posted February 9, 2006 Author Share Posted February 9, 2006 prieth, Thanks for that. That car is an impressive bit of kit isn't it. Looks like an OTS bell housing none the less? Could I be that lucky? Ron, I am interested in the jerico because I can get it for around AUD3K in a full race reco state, there are a bajilion ratios to choose from, and they're tough as nails. I will investigate the T5 a little more when the time comes but its hard to pass up a full race box for less money. Dave Quote Link to comment Share on other sites More sharing options...
johnc Posted February 9, 2006 Share Posted February 9, 2006 Taylor builds, services, and has adapted Jerico transmissions to the Datsun L16, L20, and L24. Also, having owned a Quaife sequential dog box I can tell you that using the clutch on upshifts is a sure way to damage the dog rings on any dog box. Just lift and shift very quickly. On downshifts its more critical to properly rev match then it is to use the clutch. I put over 25 hours on my transmission and when it was opened up and inspected it the dogs were barely even nicked. Per Scott at Taylor the transmission was basically brand new. You can easily drive a dog box on the street if you know how to shift. Quote Link to comment Share on other sites More sharing options...
thehelix112 Posted February 10, 2006 Author Share Posted February 10, 2006 Johnc, Thanks for the insight, awesome to hear from someone who has driven/owned one. Its good to hear that the dog rings were lasting well. I'm sold. Need to learn how to match revs a little better though, do you give driving lessons? Dave Quote Link to comment Share on other sites More sharing options...
homerneedspeed Posted February 10, 2006 Share Posted February 10, 2006 if you nee any info i have a friend that works at taylor race engineering and i live 7 miles away. Quote Link to comment Share on other sites More sharing options...
Guest ON3GO Posted February 10, 2006 Share Posted February 10, 2006 if we go threw taylor are we stuck with a factory spec gearing? or what? im a big newbie to this but im in need of a stronger gear box and its either something like this or a 300zxTT 5-speed swap. whats the price on something like this? mike Quote Link to comment Share on other sites More sharing options...
thehelix112 Posted February 10, 2006 Author Share Posted February 10, 2006 homerneedspeed, It would be great if you could get a price/availability on a bell housing to suit L28. Thanks mate, Dave Quote Link to comment Share on other sites More sharing options...
preith Posted February 11, 2006 Share Posted February 11, 2006 Good news, I emailed the owner of the red GT2 which I posted the link for. He replied with the following: "I used a Nissan bellhousing from an automatic transmission. Ken Muth from Washington machined an adaptor plate. It will accept the four speed or the five speed like mine. Ken can be reached at the following numbers, Ken Muth home 360-668-6071 cell 425-971-4251" If I had only known! I've literally thrown away 3 auto transmissions. Quote Link to comment Share on other sites More sharing options...
speeder Posted February 12, 2006 Share Posted February 12, 2006 I am about to buy either a Tex Racing T101 or a Jerico (X)R4 for my "next" engine (4.5L Turbo Buick V6 Stage 2), because of the torque handling capabilities of those transmissions. I've not been able to find an affordable synchro box that will stand up to 800 lb/ft or so expected from the Buick. The car sees about 3000 street miles a year - with both drag and roadrace duty planned, and I'm really ignorant of what driving techniques to use for a dog-box.. John, care to help educate me on How To Shift? Or point me to some resources? Quote Link to comment Share on other sites More sharing options...
tube80z Posted February 12, 2006 Share Posted February 12, 2006 I had a super vee with a hewland dog box. The best way to shift it was quickly. On an upshift I'd simply lift the throttle a tad and select the next gear. If you tried to use the clutch you'd often hear a crashing sound out back. If you must use the clutch just bump it but don't hold it all the way down (maybe you have a pressure actuated ignition cut). Dog rings, unlike syncros literally grab the gears and engage them. You need to be careful on a downshift that you don't select the wrong gear. Because it will engage. Normally to downshift you'd pull the gear to neutral, rev the engine, and engage the lower gear. Normally I was left foot braking at the same time and going down gears with quick stabs of the throttle to match gear speed. In the hewland the part I hated most was selecting first to start. It sounded like parts were exploding in the box. It was best to quickly move the shifter after depressing the clutch (the gears need to be moving to engage. Often I'd ask people to push the car and I'd do this rolling. My EMOD project has a g-force dog ring T5 tranny that I'm looking forward to using. Cary Quote Link to comment Share on other sites More sharing options...
preith Posted February 13, 2006 Share Posted February 13, 2006 Same as Tube80Z mentioned, I was talking with a few Formula Ford owners at the track, and they both mentioned that they just dab the clutch pedal to help cusion the shifts. Quote Link to comment Share on other sites More sharing options...
thehelix112 Posted February 13, 2006 Author Share Posted February 13, 2006 Preith/tube80z, Awesome info. Thanks for that! Dave Quote Link to comment Share on other sites More sharing options...
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