Ben240z1973 Posted August 18, 2009 Share Posted August 18, 2009 Hello, I have a 73 240z that has a l28 and a 5 speed. It has su carbs and original air filter. Ive had it tuned up, but it just doesnt seem to have the power I thought it should.Maybe its just me. Around 4500 rpm it seems to be maxed. Maybe some of you know an easy or inexpensive way to increase horsepower until I can afford more.I just spent all my money on rims(axis bonzai) they come in, in a few days.If anyone has advice please let me know. Quote Link to comment Share on other sites More sharing options...
hoov100 Posted August 18, 2009 Share Posted August 18, 2009 easy or inexpensive eh? SEARCH, i have been reading for almost 4 years now and i am almost done with the sticky's!!! Quote Link to comment Share on other sites More sharing options...
FlatBlack Posted August 18, 2009 Share Posted August 18, 2009 Re: How can I make it faster V8 Quote Link to comment Share on other sites More sharing options...
280zzzz Posted August 18, 2009 Share Posted August 18, 2009 Not smart ass answer: High compression flat top pistons Upgraded exhaust manifold and carburetor High flow exhaust and headers Racing Camshaft Quote Link to comment Share on other sites More sharing options...
FlatBlack Posted August 18, 2009 Share Posted August 18, 2009 Not smart ass answer: High compression flat top pistons Upgraded exhaust manifold and carburetor High flow exhaust and headers Racing Camshaft An aftermarket EFI is going to do you a world of good... Quote Link to comment Share on other sites More sharing options...
skib Posted August 18, 2009 Share Posted August 18, 2009 Not smart ass answer: Were not totally being smart asses. Were encouraging the use of the search function, because its ALL there in the archives. And discouraging the spoon feeding of people who are to lazy to search for themselves, because again, its ALL there in the archives. Quote Link to comment Share on other sites More sharing options...
hoov100 Posted August 18, 2009 Share Posted August 18, 2009 I could build a z from scratch using the info from this sight. (no joke) Quote Link to comment Share on other sites More sharing options...
skib Posted August 18, 2009 Share Posted August 18, 2009 I could build a z from scratch using the info from this sight. (no joke) I did, there literally is that much info here. Quote Link to comment Share on other sites More sharing options...
zedman240 Posted August 18, 2009 Share Posted August 18, 2009 Ben, It depends what you want to do with the zed, red light drags or circuit racing. Starts from 000's and up! Quote Link to comment Share on other sites More sharing options...
Guest Rolling Parts Posted August 18, 2009 Share Posted August 18, 2009 ...it just doesnt seem to have the power I thought it should...I just spent all my money on rims First off, find out what you have. Your car has already been modded with an L28 so find out what kind of L28 was tossed in there, what head was installed, what distributor is in it, and what needles are in the SU's. For a little help in getting a ball park idea on mods, have a look here first: http://datsunzgarage.com/engine/ When you find out what you have, you can ask where to go from there. Quote Link to comment Share on other sites More sharing options...
ModernS30 Posted August 18, 2009 Share Posted August 18, 2009 No fenders, no hood no door no hatch no brakes no lights no glass no seats. Mad tyte jdm style weight reduction? Quote Link to comment Share on other sites More sharing options...
Iceman Posted August 18, 2009 Share Posted August 18, 2009 I'd do some work on your SUs. I have almost the same setup and I can twist mine up to 6000 with power. I used to top out much lower than that (maybe it was around 4000) when my SUs werent balanced. Not smart ass answer: High compression flat top pistons Upgraded exhaust manifold and carburetor High flow exhaust and headers Racing Camshaft Wow, i'd like your budget if you consider those inexpensive! Quote Link to comment Share on other sites More sharing options...
JSM Posted August 18, 2009 Share Posted August 18, 2009 For these type of occasions, there should be a FAQ sticky thread on how to properly search. There most likely is one, i just haven't searched! Quote Link to comment Share on other sites More sharing options...
Drax240z Posted August 18, 2009 Share Posted August 18, 2009 (edited) Instead of being a total smart ass, I am going to post some helpful info on why your car might be falling on it's face at 4500rpm. What an interesting thought on a bulletin board. Ben, if you want more power you should take a good hard look at what you have now. Your L28 should not be maxing out at 4500rpm. It doesn't matter what you add, unless you find out why it's falling on its face, the addition of more parts won't help you much! I'd start by taking a good look at the basics and make sure they are ok, or simply swap with new if they are questionable. Spark plugs, fuel filter, distributor cap & rotor, air filter, ignition leads... you should likely replace all of these as peace of mind. (esp. fuel filter!) I'd take a good look at the size of your exhaust system, a 2.25" crush bent system works very well on a street build L28. Anything smaller than that is likely costing you some power. After you are sure everything is in good mechanical condition, THEN tune your carbs. Biggest bang for the buck for a faster car for you: - Make everything work properly - Exhaust - Increase rear differential ratio (at the sacrifice of highway speed a little) Hope that helps. Edited August 18, 2009 by Drax240z Quote Link to comment Share on other sites More sharing options...
280zzzz Posted August 18, 2009 Share Posted August 18, 2009 I'd do some work on your SUs. I have almost the same setup and I can twist mine up to 6000 with power. I used to top out much lower than that (maybe it was around 4000) when my SUs werent balanced. Wow, i'd like your budget if you consider those inexpensive! didnt read the inexpensive part lol Quote Link to comment Share on other sites More sharing options...
Scott_M67 Posted August 18, 2009 Share Posted August 18, 2009 These old cars are notorious for rusty junk in the fuel tanks. I'd check the fuel filter and make sure you are getting good fuel pressure. Once the fuel delivery is straightened out, a little more cam would help extend your RPM range. Due to your low compression you'll need to stick with a short duration cam (stage 1-260 advertised duration) similar to the Nissan "C" cam. Quote Link to comment Share on other sites More sharing options...
FlatBlack Posted August 18, 2009 Share Posted August 18, 2009 (edited) This motor doesn't gain much performance with cheap mods. If you want real results, save up your pennies and do a PROPER upgrade [turbo, cams etc] or do a swap [V8, RB, whatever]. Saying you want a lot of performance for not a lot of money right after you said you spent a large portion of your budget on aesthetics [rims] doesn't help. There is plenty of information on here and if you would have read the forum rules it already says this and directs you to use the search function and stickies. Good luck with your project. Edited August 18, 2009 by Drax240z Quote Link to comment Share on other sites More sharing options...
Ben240z1973 Posted August 18, 2009 Author Share Posted August 18, 2009 thanks for the info guys. The car runs well, thats why I bought the wheels. This is definetly not the first mod Ive made but I do find it foolish that I dont know if the fuel filter has been changed.Ill check it out.Thanks and Ill post the og bozai wheels when I get them.(if the rules allow it). Quote Link to comment Share on other sites More sharing options...
zclubhouse Posted August 18, 2009 Share Posted August 18, 2009 Have you checked your timing? Quote Link to comment Share on other sites More sharing options...
FlatBlack Posted August 19, 2009 Share Posted August 19, 2009 thanks for the info guys. The car runs well, thats why I bought the wheels. This is definetly not the first mod Ive made but I do find it foolish that I dont know if the fuel filter has been changed.Ill check it out.Thanks and Ill post the og bozai wheels when I get them.(if the rules allow it). There is a thread called "Wheel Show" Post 'em up! Quote Link to comment Share on other sites More sharing options...
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