Mauisnow13 Posted February 27, 2008 Share Posted February 27, 2008 If you turbocharge an NA L28 out of a (let's say '80) 280zx, will it produce more power than a '80 l28et? If both engines are stock. I have seen hp ratings for the l28et at about 186, and the NA at near 170. It would make sense to me that running the stock 7psi on an NA would make more than 17hp. Right? Just a thought while I'm searching for an engine. I have searched this a couple times, but didn't find much. Maybe it's a dumb question, but I was just wondering. Thanks for all of the help Quote Link to comment Share on other sites More sharing options...
Mr.INSANE Posted February 27, 2008 Share Posted February 27, 2008 Well technically I believe the N/A motor would make more power because of the higher compression ratio (Eg Flat top Pistons) versus the dished turbo pistons. But the turbo motor has a slightly better block and is more suited to the turbo with its lower compression ratio Quote Link to comment Share on other sites More sharing options...
Matt K Posted February 27, 2008 Share Posted February 27, 2008 Same block for turbo & n/a of the same years... Quote Link to comment Share on other sites More sharing options...
MJLamberson Posted February 27, 2008 Share Posted February 27, 2008 both motors have the exact same block, the f54 was on both, the turbo motor has a better head, the p90, it flows better because of the exhaust ports but everything else is the same (other then the pistons and cam). the na would make more power on stock boost but with the p90 and dished pistons the boost can go up higher, safer, making more power. the boosted NA would be more responcive off boost, but on boost, do to the higher commpression it is more prone to detonate Quote Link to comment Share on other sites More sharing options...
Mauisnow13 Posted February 27, 2008 Author Share Posted February 27, 2008 So it would be better and safer just to drop an L28et then a turbocharged NA. Thanks for the help, that's what I needed to know. Also, is it true that they upped the hp output in '80? Quote Link to comment Share on other sites More sharing options...
MJLamberson Posted February 27, 2008 Share Posted February 27, 2008 Im not sure about that... also, everything I know on the subject I learned from lots of searching, there is tons of info out there on boosting na's, zx an s30 engines alike... this next month I will either be boosting my stock 77 engine or a zx na engine, Ill let you know how it goes Quote Link to comment Share on other sites More sharing options...
Mauisnow13 Posted February 27, 2008 Author Share Posted February 27, 2008 I've been searching a lot lately, too. I got a bunch of free turbo stuff so I was thinking about doing a blow-through setup on my l26, but decided against it and to just drop an L28et. Thanks for all the help guys, I appreciate it. Quote Link to comment Share on other sites More sharing options...
Vintage Posted February 28, 2008 Share Posted February 28, 2008 Part of your initial confusion resulted from the difference in the way the 70-78 cars were rated and the 79-83 cars were rated. Although the L28E in the 75-78 Z was rated for 170 horse, the average stock L28E pulls around 120-125 from what I've seen. The rating on the ZXs is much closer to reality due to a mandated change in rating methods. Quote Link to comment Share on other sites More sharing options...
slownrusty Posted February 28, 2008 Share Posted February 28, 2008 Part of your initial confusion resulted from the difference in the way the 70-78 cars were rated and the 79-83 cars were rated. Although the L28E in the 75-78 Z was rated for 170 horse, the average stock L28E pulls around 120-125 from what I've seen. The rating on the ZXs is much closer to reality due to a mandated change in rating methods. Absolutely correct....lets compare apples to apples. the NA L28 produces 135hp if the hp rating is updated to the same year of specification as the turbo L28 which was 180hp. Turbocharging a NA L28 and dropping 7psi of boost on it will yield more power that the equivalent low compression L28ET but you have to control detonation. Yasin Quote Link to comment Share on other sites More sharing options...
MJLamberson Posted February 28, 2008 Share Posted February 28, 2008 Absolutely correct....lets compare apples to apples. the NA L28 produces 135hp if the hp rating is updated to the same year of specification as the turbo L28 which was 180hp. Turbocharging a NA L28 and dropping 7psi of boost on it will yield more power that the equivalent low compression L28ET but you have to control detonation. Yasin what would one produce hypotheticaly on say 7psi? 10psi? Quote Link to comment Share on other sites More sharing options...
cygnusx1 Posted February 28, 2008 Share Posted February 28, 2008 This has been posted and discussed but it is vague. BALLPARK FIGURES: On the L28ET Stock longblock, turbo, and injection, depending on the exhaust system, you will see anywhere from 10-15HP for every PSI you add in boost up to a certain point. After 10psi total, you better be adding fuel and intercooling. IF you start with an NA motor, you will make closer to the 15HP per PSI added BUT you will run into the detonation wall MUCH sooner. Guessing around 5psi max with the NA injection? NOTE: The stock L28ET figures of 180HP are made at 7psi. Quote Link to comment Share on other sites More sharing options...
Mauisnow13 Posted February 28, 2008 Author Share Posted February 28, 2008 Interesting facts. Thanks guys! I'm glad I decided not to go this way. QUESTION: cygnusx1, wat do you mean by "you better be addin fuel"? Intercooler is a given. Do you mean like fuel management, like Megasquirt ECU or something? Quote Link to comment Share on other sites More sharing options...
TrumpetRhapsody Posted February 28, 2008 Share Posted February 28, 2008 The efficiency of the stock L28et turbo peaks at about 10psi. Above that the hp/psi goes way down, and you'll need to cool your intake charge and get more fuel to the engine to keep up with the boost. Quote Link to comment Share on other sites More sharing options...
Mauisnow13 Posted February 28, 2008 Author Share Posted February 28, 2008 I see. I was planning running an intercooler and all that from the get go pretty much anyways. Quote Link to comment Share on other sites More sharing options...
steveosupremeo Posted February 29, 2008 Share Posted February 29, 2008 also the L28et didn't make it into a z until 81. 81-83 have same block, different pistons as long as it is stamped F54. N42 is your early L28 block. 75-80 L28 = 135 hp, 81-83 na l28 = 145 hp. 81-83 turbo like they said is 180 hp. the difference in the two NA blocks is a bump in compression from 8.3-8.8 when you are looking for where the 10 HP comes in. a result of a flat top piston substitute in the block and a slightly higher volume combustion chamber in the head. the exhaust runners on the P90 don't actually flow any better than the steel linered heads, but the liners don't stand up well to turbo exhaust temps according to braap and as we know, they can't be ported for later mods. all you can do is smooth the aluminum transition after the seat. the real advantage in stock form would be the full circular intake ports instead of the D shaped ports found in the P79/N47 heads. probably not as noticeable on a turbo being it is pressurized though. Quote Link to comment Share on other sites More sharing options...
Mauisnow13 Posted March 1, 2008 Author Share Posted March 1, 2008 great info steveosupremeo. I appreciate everyone's input. Thanks again, Amren Quote Link to comment Share on other sites More sharing options...
datman Posted March 9, 2008 Share Posted March 9, 2008 Stick a 2mm steel head gasket on the NA motor and you will be fine. I run a NA l28 with megasquirt and a holset turbo @ 15 psi......it has more power than traction! Quote Link to comment Share on other sites More sharing options...
thetremendoustim Posted July 3, 2008 Share Posted July 3, 2008 Hey i didn't want to start a new thread but will running 10PSI with fuel and intercooler (which I have but haven't set up), at 9.2:1 be safe and no detonation as long as I get like 91 octane? I'm planning on putting a E88 on an turbo block with dished pistons. Quote Link to comment Share on other sites More sharing options...
cygnusx1 Posted July 4, 2008 Share Posted July 4, 2008 Hey i didn't want to start a new thread but will running 10PSI with fuel and intercooler (which I have but haven't set up), at 9.2:1 be safe and no detonation as long as I get like 91 octane? I'm planning on putting a E88 on an turbo block with dished pistons. Should be fine. Just dont go much over wide open throttle at 5000rpms unless you add more fuel up top under boost. The stock fuel system will start leaning out after around 5500rpms and higher than 10psi boost. You will have plenty of power down between 3000 and 4500 rpms. Quote Link to comment Share on other sites More sharing options...
datman Posted July 4, 2008 Share Posted July 4, 2008 mine hits its max VE number around 4100rpm ve numbers tails off after that...thats where my max torque is i guess Quote Link to comment Share on other sites More sharing options...
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