kj280z

I normally wouldn't comment any further, but you're talking out both sides of your mouth so I had to... Soooo... Let me ask you ...if you go to another Dynojet and your car only shows 255 ft-pounds of torque having made no changes what-so-ever, would that also qualify you to "brag"? I guess I should start going to EVERY dyno around and find out which one makes the highest numbers since that seems to be the essence of what you're saying! If you want to "prove" anything, do it on the track and take all the numbers you've made on a dyno with a grain of salt and use them for what they are... benchmarks for comparision and analysis.

Please. A big mistake that people make too often is to focus on dyno numbers. I'm amazed that this thread has gone on for so long. The only real purpose a dyno serves is to help you to determine if changes you've made had a positive or negative effect as compared to a previous pull on the same dyno. You could put your car on a dynojet and make 400hp on it, then go down the street to another dyno of the same brand and make a completely different number. Dyno's are ONLY for benchmark and comparison purposes! If you're doing it for bragging rights it serves no purpose. One comment on the Mustang Dyno... there are some big advantages to using a Mustang dyno for tuning under load for drivability. BUT, if you're going to a Mustang dyno for bragging rights trying to make a big number you're going to be disappointed. Whenever I see dyno numbers I always take them with a grain of salt... As should everyone here... A more beneficial analysis of a dyno chart is to evaluate the power curve and analyze the characteristics of how and where the motor makes power. This type of analysis allows you to determine if the power band will meet your goals (different applications require different characteristics). For instance if you're building a high compression race motor designed to make power in the upper rpms, learning where your motor makes its best power in this example would allow you to optimize your complete setup (gear ratio's ect) and show where to make changes to get the best result. Ken

Thanks bastaad525! would you happen to have the actual files created by the winpep software? I need them with RPM at the bottom and a few other things changed... if I had the file I could do it myself... Also, on your page it looks like you were running 14 psi... Was there a different chart that I should look at? Also, please email me at ken280z@hotmail.com i'd like to talk to ya about something... Thanks again!!! Ken

Hey all, I've searched through the archive but can't find a dyno chart close to what I'm looking for... I was hoping you could help. I need a dyno chart for a 3liter (I'd settle for a 2.8 as well) turbo L-Series motor running 9-10 pounds of boost... Preferably I'd like the dyno plot to start at as low an RPM as possible (around 1500 RPMs would be great). I'm not focused at all on the HP or torque numbers that it made. I am looking more at the characteristics of the power band. Hope you can help me out. Please email a jpg to ken280z@hotmail.com or post it here... Thanks! Ken

7000 RPMs is my redline and I hope to see it often!

I finally got this right! Always had trouble posting a pic... This is my 6.75" custom pulley which bolts to the 82/83 damper. Ken

Mike and SHO-Z, Hey... I started doing some calcs just to see what your ratios would be... I have a spreadsheet that I put together that makes it real easy... if you'd like a copy email me at ken280z@hotmail.com In both cases I believe the 6.75 inch drive pulley that I have would work very well for you guys... Before I share the numbers with you, there's one other thing to consider ... clearance...when trying to increase the crank pulley size to anything larger than around 7 inches... I couldn't use my electric water pump and had to go back to the stock H20 pump. You might have similar issues but since you've placed the SC in different places you'll have to figure that out. OK... So the numbers... Mike... you seem to have 2 SC pulleys 2.55 inches and 3 inches. With a 6.75" drive pulley and 3 inch SC pulley (2.25 ratio) at 7000 rpm you'd be spinning the blower to 15,750... at 5800 you'd be at 13,050... Might be pushing it but a good place to start. If that worked out ok and you wanted to try to push it further, the 2.55" pulley would yield a 2.64 ratio and 18,529 rpms at 7000 and 15,352 at 5800 rpms... I'm not sure what a M62 can be spun to, but if it's the same as a MP62 I believe the 2.55" pulley would be pushing it slightly beyond it's limits but it has been done before. I'm pretty sure that if you put water injection on it you'd be able to get there (I'm going to run water injection on mine). SHO-Z I LIKE the idea of having a clutch type snout and I have heard of aftermarket pulleys being made for them. If memory serves me correct you can get a 2.75 inch pulley for your blower. Either way, again after doing the numbers, I believe that a 6.75 or 7 inch drive pulley would be ideal for you as well... Here's why... At 5800 rpms with your current 3 inch pulley and a 6.75 inch pulley your SC would be turning 13,050 and peak at 7000 rpms at 15,750... not too bad! If you were able to get the 2.75 inch pulley, the numbers change to 17, 182 at 7000 and 14,236 at 5800 again not bad! If you got the 7 inch drive pulley and kept your 3 inch SC pulley it would be 16,333 at 7000 and 13533 at 5800. I think it's best to calc your drive pulley size to be within your desired "window" and then make your changes on the blower side, but that's just me... Hope this helped... Ken

I wouldn't consider it a design flaw, just an acceptable compromise. I found a guy in southern florida to make my pulley, I'm sure you could do the same for around $175? I did a quick search for pulleys and found: http://www.vacmotorsports.com/cgi-bin/view_item.pl?item_id=377 http://www.bmpdesign.com/ I thought for sure Pulleyboys would have had one. Have you decided how fast you'd like to spin your blower? What is the current diameter of your drive pulley (crank)? I've spoke to Magnuson several times they would like for me to keep it below 16,000 rpms... (and that might be pushing it without a way to cool it down)... I'm certainly going to test it's limits... I know Stillen has spun theirs (MP62) to 18,000 on a few occasions. I can tell you that with my current pulleys when I started it yesterday for the first time it showed an INSTANT 7.5+ PSI of boost with just a blip of the pedal (blip to 1700 rpm from idle) (haven't driven it yet!!!) heh heh heh

Hey 280zedx, How the heck are you going to be able to change your spark plugs? Just curious... I love what you've done! We'll have to compare notes soon... I just started mine up yesterday... The MP62 blower has an intoxicating whine to it that I just LOVE! Ken

Hey guys... For what you'd spend to get that pulley adapted to your damper I kinda like my solution better... What I did was calculate the "range" of RPMS that I wanted to spin my blower and then found the optimum size crank pulley that would put me in that range. I have several pulley sizes that I can put on my blower to change boost. Why would you want to change the crank pulley when you can more easily change the blower pulley? If you do a search you can find that there are MANY companies that make aftermarket pulleys for almost any blower made... buy a few of those and change your boost that way...

Do you know what it would entail to get this to fit into a 1975 280Z?

I can help all you guys looking to get a pulley... I've had a CNC shop make a pulley that fits the 82-83 damper... The shop is small and I "think" I could have a few more made for around $175 each... If we ordered a larger quantity the price would obviously go down. The pulley is 6.75 inches and other sizes could be done to fit your needs. Check it out at the following link or email me at ken280z@hotmail.com for details... Click here to see the pulley I think you'll like it! Ken

Hey guys... This was really helpful... I just recently had a problem with my crank pulley. I'd like to hear what you guys have done to mount your crank pullies. Currently I have a 6 inch serpentine pulley that fits onto the front of a 77/78 crank pulley. I'm planning to start with a 2.75 inch blower pulley (2.18 ratio)... based on some quick calcs on my 3 liter motor it looks this will yield 6.7 pounds of boost. I'm using the MP62, and have had discussions with several folks who say this blower can be spun to 18,000 rpms... I'll probably have a smaller blower pulley made to test this... (my calcs say that the 2.61 ratio will yield 10.87 psi) I'd love to hear what you have done! I might need a better crank pulley option so please share what you've done and if ya have an extra I'd consider buying one!

Jeff, Can you tell me what the inside diameter of the large hole in the front of the pulley is? I have a serpentine pulley for my supercharger that I'd like to determine if it can be adapted to work with this dampener. Thanks Ken

Max, Will these gaskets support an 89mm cylinder bore? If you're sending them "donation" gaskets to be used as a template make sure you specify a larger bore size if possible.

Norm, Good point... I forgot to tell you about that... The tensioner plate will mount on the front of the motor and will serve two purposes... 1. Be the mounting point for the tensioner pulley assembly 2. It will cradle the snout of the supercharger to eliminate the downward force on the nose of the blower. I'll post a picture when it's complete.

moby, The LSD that I recently purchased (was it from you?) is going in my 240z but the 280z that will be receiving the supercharged power plant already has an LSD.

Pete/All, A lot of people have asked the same questions regarding specs... Here's some info: The specs are .040 over custom forged pistons made by Ross Racing Pistons LD28 crank 240Z rods (magnafluxed and race prep) 3.0 liter stroker at 8.5:1 compression 1mm Headgasket (Probably going to use one from Arizona Z Car) Custom (one of a kind) cam made to maximize the supercharger by Schneider 1 3/4" Nismo Headers (Ceramic coated by a great guy in Orlando) Notice the stock Datsun engine color <grin> P90 head with a minor port and polish Will have an Electric Water pump by CSR Performance Products MP62 Magnuson Supercharger which will make 10-12 pounds of boost (hopefully) The intake is a HEAVILY modified Clifford Manifold that was originally made for a 4 barrel carb, drilled for port fuel injection. Should make good HP with a ton of low end grunt if all goes well Engine Management will be an Electromotive Tec2 with a 60-2 trigger wheel mounted on the crank pulley 42lb Ford O-ring style injectors with a custom fuel rail And the list goes on.... Regards Ken

Jack46 The target to "launch it" is coming up soon! The things left to finish are: 1. Make the tensioner plate 2. Finish the assembly of the motor (I have to pull the head off one last time since I've decided to use a different head gasket 3. Install the throttle cable 4. Find a throttlebody 5. Get the crank trigger wheel mounted to my crank pulley (and balanced) 6. Install the Tec2 7. Install the motor 8. Tune it 9. Then as Norm would say... "Drive it like I hate it"! <grin> None of those things listed will take very long so I hope I'm going to be done very soon. I try to spend 2 hours per day on it so it has been moving along steadily lately. Ken

Cody 82 ZXT Hey... The pulley I'm using has 2 standard type V Belts and the Serpentine pulley (6 rib) adds another inch in front. Most likely your 280zxt has 3 V Belt pulleys... but either way you would need to determine if adding an inch in front would cause you a clearance problem in a 280zx... I honestly think it would be ok. Hope that helps Ken

Pete, Yo! Yes the Stillen inlet is the one pictured. Come on Pete... Steve had to show you how to turn off the DSC in your Mini Cooper at the track he sure knows what an L28 is! <kidding> He is a great guy and has been a great help to me. He shared some specs on the supercharger rpm on the 350z and how much boost it was making with different pulley sizes and talked about the project with me a few times. I think he "digs" it Now... I've either got to find a 350Z throttlebody or do some more mods to fit on a different one... Check this out... Take a WILD guess what a 350Z throttlebody costs new from Courtesy? My cost was $664.00!!! Retail is over $900 bucks! WHAT a RIP! Drive by wire.... what a joke... I suppose in 10 years when that item fails we'll have quite a few unhappy 350z owners! GEEZ!!! I only wanted the throttlebody and didn't need the electronics but it only comes as a package. I need to use a different TPS with the TEC2. Also, the TEC2 is a breeze to tune when you have the wizard Rick Bowers at the keyboard <grin> He da man!

I believe I'll have plenty of clearance in my 75 280z. I hope to have the engine in shortly so I'll let you know once it's in and the radiator is installed. Since I've already received a few emails about this, the gap between the pulley and the motor is because the timing chain cover is not installed. I just put the pulley on so Norm could see how it all fits together. I still need to make a tensioner plate in the next few days. Also, since I already have received a question on the inlet housing for the supercharger, I'll elaborate... The supercharger is a Magnuson MP62. It is the same supercharger that Stillen is using for the 350Z. I bought the inlet directly from Stillen. I had originally made an inlet for it, but this alumunum casting is going to work perfect. More information can be found about this supercharger by Clicking Here Keep in touch if you'd like an update Ken

Hey all, I thought you'd be interested in hearing about the latest Z guy to come down to Florida to visit us. Norm and his wife came down and spent the last 2 days at our house. We had a barbeque with Rick Bowers (Speeder) and got to see several videos of Norms car blasting down the track. We had a great time and Norm and his wife are great people. Norm has literally boxes full of time slips and a log book which helps him track his changes and driving conditions. It was a great time and a blast just hanging out. I know a lot of people have been curious about the supercharger project. Norm and I talked quite extensively about it. I'm sure he'll chime in about what he thinks now that he's seen it. We had a running joke about all the stuff that I'll start breaking once the motor is running. The picture below pretty much says it all... Norm is standing by the motor with his broken crank and exploded clutch and a SEG on his face. I'm going to run the Supercharged Motor with an Electromotive Tec2... Should be fun... In addition to talking to Norm and several other Z guys about the Superchargers promise... I had a long conversation with Steve Millen about it today too... I personally think it's gonna be a total rip to drive... I'm sure Norm and others will chime in... Our goal is to run 10 psi of boost. Hope you enjoy the picture... Ken Sport Z Magazine

James, Hey... before we just let this die... I'm sure we could find another shop to continue the testing. Here's a list of all companies in Florida with a Flow Bench (Super Flow)... Wanna start calling a few? I'd be willing to help... http://www.superflow.com/TestCenters/locator.html#Florida Regards Ken

To all, Anyone living in Brevard County Florida? I'm in the early stages of starting a new Z club in the area... Details can be found at http://flzclub.com Joining the club is FREE! So I hope to hear from you! The tentative date for our first meeting is May 22nd at 1pm at Rotary Park in Merritt Island. Hope to see ya! Regards Ken