gacksen Posted November 5, 2014 Share Posted November 5, 2014 (edited) Had my car on the dyno those days and it´s not bad. it´s 3.1 with flat tops in it. didn´t measure the cam yet but will do the next days. as you can see from the torque curve it´s fully flat from 2500 above until 6000 and then falls off. as it is a stroker with the ld28 i am a little bit worried about piston speed. it has triple webbers on it that are not fully tuned up yet. will get that done in december. idle is perfect with the car. don´t drive it regular it´s just a weekend toy. what mods would be necessary to shift the redline safely to 7k also what cam should be a good choice to get a more sports car like curve ? mine reminds me of a diesel.don´t need the car for inner city traffic. Edited November 5, 2014 by gacksen Quote Link to comment Share on other sites More sharing options...
skirkland1980 Posted November 5, 2014 Share Posted November 5, 2014 A question for you. Are you concerned with idle quality? Do you want to replace the spring and retainers also?If no to both you can get a regind from Delta cam. Ask for the 270. Or maybe there is someone closer to you as they are in Tacoma Washington. Quote Link to comment Share on other sites More sharing options...
Xnke Posted November 6, 2014 Share Posted November 6, 2014 More info on the pistons, compression ratio, is the head ported or just bolted on stock? Current cam info would be a big help as well. Is it a stock cam? What size webers? That torque curve is pretty nice...223HP is not terrible if you have a small cam and a stock head. I would be starting with a cam in the 0.480" lift range, but keep in mind piston-to-valve clearance! Make sure you have enough piston crown thickness to cut the valve reliefs in. Can't really give a lot more suggestion till we know what you've got to start with Quote Link to comment Share on other sites More sharing options...
zguitar71 Posted November 10, 2014 Share Posted November 10, 2014 The Rebello 63di will get you there. Quote Link to comment Share on other sites More sharing options...
gacksen Posted November 14, 2014 Author Share Posted November 14, 2014 had some busy days with my work and not much time to take care of the car. as far as i am aware head is fully ported and webbers are triple 45" with 50mm chockes. need to take the valve cover of the see what cam it is. drove it last weekend and ran into antoher problem. gearbox crunch on downshift only from 3rd to 2nd gear. no other crunches also not in reverse. had replaced master and slave when i got the car as the fluid had been fully black. will try to adjust the slave and pedal to see if it is possible to cure the problem. only thing that worries me is that the crunch appers only on downshift from 3rd to 2nd at higher rpm´s. maybe worn snychro but not sure. when shifting into second gear the click sound of the gearbox is missing that i have in all other gears. it´s a 5speed trans from a zx 71B mated with an R200. if it would be the synchro i guess i would replace the box completly and go for an FS5W71C or FS5R30A. have read some posts about the swap with the FS5W71C swapping bellhousing etc. but could not find much regarding the 300zx turbo trans FS5R30. anybody has done this and what mods are necessary ? Quote Link to comment Share on other sites More sharing options...
zguitar71 Posted November 14, 2014 Share Posted November 14, 2014 45 mm webers cannot have 50 mm ventureis it would be physically impossible. The biggest they can have is 42 mm. It looks as though your torque comes on too early for a fully ported head. If the head was ported as large as possible the airflow would be too slow on the low end for that. It could very well have a port job that is appropriate for a street car. A good street port with the Robello 63di cam and a set of 45 with 39 ventureis when properly tuned will make 300 lbs of torque around 4500-4800 rpm and 320 hp from 6600-6900 rpm and have shift points from 7000-7300 rpm. A zx 5 speed in good shape is fine for a N/A stroker. Unless you are going to make big amounts of torque you will be adding unneeded weight and $ swapping to a 300 t trans. The 280zx is a direct bolt and the r200 is plenty strong too. Quote Link to comment Share on other sites More sharing options...
skirkland1980 Posted November 14, 2014 Share Posted November 14, 2014 I not sure that I understand this dyno graph. Shouldn't torque and hp be equal at 5250rpm? Quote Link to comment Share on other sites More sharing options...
SleeperZ Posted November 14, 2014 Share Posted November 14, 2014 I not sure that I understand this dyno graph. Shouldn't torque and hp be equal at 5250rpm? It's metric, power in kW, torque in Nm. Quote Link to comment Share on other sites More sharing options...
Leon Posted November 15, 2014 Share Posted November 15, 2014 It's metric, power in kW, torque in Nm. In the posted graph, power is shown in PS, i.e. metric horsepower. But yes, that "magical" 5250RPM is only so for power units in hp and torque units in lb-ft. Generally speaking: power = torque X RPM. The rest is just conversion factors. Quote Link to comment Share on other sites More sharing options...
gacksen Posted November 16, 2014 Author Share Posted November 16, 2014 45 mm webers cannot have 50 mm ventureis it would be physically impossible. The biggest they can have is 42 mm. It looks as though your torque comes on too early for a fully ported head. If the head was ported as large as possible the airflow would be too slow on the low end for that. It could very well have a port job that is appropriate for a street car. A good street port with the Robello 63di cam and a set of 45 with 39 ventureis when properly tuned will make 300 lbs of torque around 4500-4800 rpm and 320 hp from 6600-6900 rpm and have shift points from 7000-7300 rpm. A zx 5 speed in good shape is fine for a N/A stroker. Unless you are going to make big amounts of torque you will be adding unneeded weight and $ swapping to a 300 t trans. The 280zx is a direct bolt and the r200 is plenty strong too. have bled the clutch yesterday but it is still raining so hopefully will try it out tmr and see if there is any cure to the crunch. have adjusted the pedal and slave too. as for the carbs will get the cover off and pull the jets to see whats inside. it´s my first car with carbs so quite new to that field Quote Link to comment Share on other sites More sharing options...
munters Posted November 30, 2014 Share Posted November 30, 2014 gackson if you change the box, tell me depending on the ratio (first 2.9..? or longer), I would be interested in the 71B Quote Link to comment Share on other sites More sharing options...
NewZed Posted November 30, 2014 Share Posted November 30, 2014 if it would be the synchro i guess i would replace the box completly and go for an FS5W71C or FS5R30A. have read some posts about the swap with the FS5W71C swapping bellhousing etc. but could not find much regarding the 300zx turbo trans FS5R30. anybody has done this and what mods are necessary ? If it's not bad, switching to Redline MT90 gear oil, or a blend of Swepco 201 and ATF might get you by for a while. Here are a few links on the 71C swap - http://www.motortopia.com/cars/1973-datsun-240z-11118/car-pictures/240sx-transmission-swap-14041/DSC04293JPG_Thumbnail1.jpg-266482 http://home.comcast.net/~zheimsothtn/transmission.htm http://www.atlanticz.ca/zclub/techtips/240sxtransmissioninstall/index.html Quote Link to comment Share on other sites More sharing options...
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