hobojobo Posted February 28, 2012 Report Share Posted February 28, 2012 K here's the deal, I daily drive my 69 510, and drive on the freeways a lot. But the problem is that freeway speeds here are 70ish and for me to go 70 I need to be in 5th gear at around 4000 rpms. I was wondering what my options are for making freeway driving a little better... I have an l20b with a 5 speed dogleg, and what I think is an r180 rear end... but I may be wrong, Picture is not relevant but I felt bad that I havent put it on ratsun yet :P"> Quote Link to comment
Rustina 510 Posted February 28, 2012 Report Share Posted February 28, 2012 I drive my daily 69 Datsun 510 wagon every day from west Beaverton to se 122nd street in ckackamas... It's the 217s, i5s,205n I drive about 65/70 in a 4 speed wagon. And Id say I'm running high 3's rpms It isn't too bad and the Lseries motors can handle that pretty easy. Quote Link to comment
hobojobo Posted February 28, 2012 Author Report Share Posted February 28, 2012 I drive my daily 69 Datsun 510 wagon every day from west Beaverton to se 122nd street in ckackamas... It's the 217s, i5s,205n I drive about 65/70 in a 4 speed wagon. And Id say I'm running high 3's rpms It isn't too bad and the Lseries motors can handle that pretty easy. Mine is at 4-4500 rpms at 60ish mph, Id like to keep up with traffic better :lol: Quote Link to comment
Rustina 510 Posted February 28, 2012 Report Share Posted February 28, 2012 I'm not sure what tranny I have, and I think the diff was from a automatic and has a better stretch in the gears but didn't say you had a 5 speed? Quote Link to comment
Rustina 510 Posted February 28, 2012 Report Share Posted February 28, 2012 Yeah it's the dogleg tranny. Get a 280z 5 speed tranny and get the driveline shortened and the gears will be way better and stronger Quote Link to comment
Rustina 510 Posted February 28, 2012 Report Share Posted February 28, 2012 Or ask leaceon how he does his tranny I know he has a dogleg but it does way better than your talking about Quote Link to comment
hobojobo Posted February 28, 2012 Author Report Share Posted February 28, 2012 Yeah it's the dogleg tranny. Get a 280z 5 speed tranny and get the driveline shortened and the gears will be way better and stronger How much bigger is a 280z 5 speed? will i need to modify the tunnel? Quote Link to comment
Laecaon Posted February 28, 2012 Report Share Posted February 28, 2012 You need to check your rear end gears. R180 is not stock, therefore it could be a myriad of different things. Dogleg and 3.889 rear end and 185/60/14 at 70mph and I am just shy of 3500 rpm by the rpm calculators. dogleg final gear is .864 (maybe .854...) Quote Link to comment
Laecaon Posted February 28, 2012 Report Share Posted February 28, 2012 How much bigger is a 280z 5 speed? will i need to modify the tunnel? Not modify the tunnel, but will probably need a new tranny mount and shorter drive shaft. It is a longer transmission by 5.5 inches. Quote Link to comment
Rustina 510 Posted February 28, 2012 Report Share Posted February 28, 2012 How much bigger is a 280z 5 speed? will i need to modify the tunnel? I don't think so, just a modified tranny mount and driveline from most of what I have red. But if it's your diff then have that looked before you rip out the dogleg Quote Link to comment
Dat Lurka Posted February 28, 2012 Report Share Posted February 28, 2012 Whats up with the 70mph dattos? I know a 620 with L20b will do 100 Quote Link to comment
Rustina 510 Posted February 28, 2012 Report Share Posted February 28, 2012 I've gotten my wagon to 85-90 ish but I don't like driving it that fast. I like to cruise at 60-70 and let the traffic pass me, I don't mind going slOwer in the wagon Quote Link to comment
Rustina 510 Posted February 28, 2012 Report Share Posted February 28, 2012 Slow and low is the way to go bro... Oops I rapped again sorry. Quote Link to comment
hobojobo Posted February 28, 2012 Author Report Share Posted February 28, 2012 Whats up with the 70mph dattos? I know a 620 with L20b will do 100 Most of us can do 100:D And if I could figure this out I would do it more often Quote Link to comment
Dat Lurka Posted February 28, 2012 Report Share Posted February 28, 2012 Slow and low is the way to go bro... Oops I rapped again sorry. I feel you. I cruise when I'm in a car. My cars have to be comfy, have surround sound, and I'm one of those people everyone hates to get behind cause I'll be driving 20 in a 35 and I don't give a fuck But when I get on a bike I'm motherfuckin ghostrider bitch. Whats the difference between crashing at 60mph on a bike and 160mph? Disentigration Quote Link to comment
erichwaslike Posted February 28, 2012 Report Share Posted February 28, 2012 haha my freeway speed is 70-80 at about 5200-5700.... r16 4speed auto rear end and 155/80/13s and 110-115 comes in at about 6300. had it at 6600 one time Quote Link to comment
datzenmike Posted February 28, 2012 Report Share Posted February 28, 2012 Mine is at 4-4500 rpms at 60ish mph, Id like to keep up with traffic better :lol: Do you have a tach? or guessing? As 4-4,500 seems kind of high for 60 in a car, considering you're in overdrive 5th gear. Quote Link to comment
]2eDeYe Posted February 28, 2012 Report Share Posted February 28, 2012 The L series redlines at 7000rpm. 4000 rpm is just about halfway through the rpm range considering idle is about 700-800rpm. Most other car/truck motors redline at 5000rpm so most people tend to think 4000rpm is really high but it isn't for an L series. :) Quote Link to comment
hobojobo Posted February 29, 2012 Author Report Share Posted February 29, 2012 Do you have a tach? or guessing? As 4-4,500 seems kind of high for 60 in a car, considering you're in overdrive 5th gear. I have a tach Quote Link to comment
Stupid_fast Posted February 29, 2012 Report Share Posted February 29, 2012 Make sure your speedo is correct. 80MPH on my goon's speedo is in fact 70MPH GPS verified ... calculated 3600rpm with early 280zx 5 speed, 3.9 rear end. 195/55/15's. Quote Link to comment
Uber Deaf One Posted March 1, 2012 Report Share Posted March 1, 2012 I'm turning 2500 rpm at 60 mph. KA24DE engine and transmission with a Subaru 3.70 LSD and 205-50-15s. I can't imagine turning 4k just cruising on the freeway My car will hit 150 at 6k (power falls off dramatically past that) in 5th gear. I've had it up to 5600 which is like 135 mph. It's a boatload of fun having this much top end Quote Link to comment
datzenmike Posted March 1, 2012 Report Share Posted March 1, 2012 K here's the deal, I daily drive my 69 510, and drive on the freeways a lot. But the problem is that freeway speeds here are 70ish and for me to go 70 I need to be in 5th gear at around 4000 rpms. I was wondering what my options are for making freeway driving a little better... I have an l20b with a 5 speed dogleg, and what I think is an r180 rear end... but I may be wrong, Picture is not relevant but I felt bad that I havent put it on ratsun yet :P"> Find out what differential ratio you have. Stock 13" tires are about 23.3" tall and 4000 RPMs with a 4.625 ratio diff will give you 70 MPH So either you have a huge differential, your speedo is whack or your tach is whack. But something does not add up. Quote Link to comment
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