Alex_V

Im not getting your point. If Im bench racing its not much different than anyone else in this thread throwing around 400 and 600hp numbers. Sorry I didn't post links to the guys that have writeups and threads about what I talked about I don't have them handy. But they aren't hard to find. But for 400whp theres known limitations that are easily remedied. Big difference between that and 600+ in an L series. ~Alex

400hp is fairly straight forward with an L28 I don't know why people make it such an impossible task. Really its just a airflow bottle neck problem, which with a stock L28 is the ports themselves which a lot of people take care of, then the stock tiny cam and then the intake manifold runners need ported themselves. There is TONS of info on making a powerful L series here on this very forum. I've done months and months and months of research and Im building a 500+hp L28ET. No stroker yet, but a rebuilt stock bottom end (arp rod bolts is the only real upgrade) and I'll be playing around with porting the head, intake manifold, exhaust manifold will easily get me over 400whp, with a nice balanced power band. Ie similar HP and TQ and not an over abundance of torque down low and fading in the top end. I also have will have two L28ets and the second one will be forged. First one is to get in the car and back on the road again after a few years of sitting. ~Alex

http://www.rx7club.com/build-threads-292/iv-rotor-build-12-plugs-9-bearings-8-ports-%3D-1-monster-1037657/ Check out how he did his pyramid style brace on the strut towers. If possible I would do that, straight tubes are much stronger, obviously. Thats how I'm doing my Z31. Other then that fantastic build. I watched your videos and wish you luck in getting ready for this racing season if you still can. ~Alex

My first 88 turbo Z31 had one with it when i bought it. Made 390ftlbs and about 300whp on a stock turbo and it held fine with tons of aggressive daily driving and lots of drift days and a few road race track events. Surprised me when I pulled the engine and found it. Then I bought one from the junkayard for $20 when I pulled the trans out of an 87 turbo because why not. I used it some other build for a week or two then an na 240sx for a few weeks (both temp builds) and it was fine. Are you taking a crap shoot it might suck, slip or explode? Yeah, but that last one isnt likely...but its possible due to random quality. That said I use DXD southbend clutches in everything else when i have to depend on it. My L28ET is getting a 350Z clutch and light rb flywheel because I got a brand new 350Z clutch with another engine. My friends stock held a 400ftlb 530whp super charged vq35 so I figured Id try it. Beats ebay quality as its OEM. Oh and as for unsprun disks....I avoid them. They are super harsh on the gears themselves because theres zero dampening from the engine to the transmission unlike most disks. I only use them now on high revving race cars for lighter disks. They are very harsh daily driving but you can get around that with more clutch slippage. ~Alex

Is the fuel pump controlled through the ecu? I'm not sure how complex the control system is but it seems to have a hi/low setting with a stock ecu. I know at trackdays I'll hear my walbro whining away much louder than if I just do street/daily driving. But i could be wrong, the one thing i don't know much about is how the fuel pump control works. But if the pump is run 100% all the time, and the return line was undersized you'd have the opposite problem. Too much fuel pressure at idle and lacking (or maybe correct) at full load or high rpm.

Whats the rule? I've been building a Z31 track car for a while with a focus on getting my nasa license for ST classes and taking it drifting occasionally as well. ~Alex

Very interesting! As Mtcookson knows Im doing a VQ30DE-TT. 10:1 comp stock and all that. Im also planning on using T25's but I believe they are going to be good for the 420+ range. Its going in my '90 240sx . Not a Zcar I looked at a few fully modded stock turbo 300zx's and all of them were in the 350 range, with only one guy at 375. He had all the bolt ons and ran the turbos at 15psi. Pretty much blowing pure hot air from what Ive seen of the T22s they come with. The T25 should be pushing more CFM's and still max out at about 15psi. Any way I need to start fabbing and get working on it. I hope to be done some time in may/june... ~Alex

The 89-94 maxima has diffrent exhaust manifolds so yes you do. Unless you want to custom fab something. The 85-88 manifolds are the same or similar to the Z31's. ~Alex

Thats detonation damage. Clean off all the carbon thats collected on the cyl heads and pistons, or run 89 octane or back off the base ignition timing 2-3 degrees. That will eventually damage the pistons and kill the engine, but it wont kill an NA engine that easy. As you can see though its well on its way to becoming the engine MTcookson had to replace. ~Alex

Id sell my L28ET setup for about $400 plus shipping.... ~Alex

YGM ~Alex

Its NA, it wont blow up unless you run low on oil or over heat it from lack of coolant....Just get a full turbo swap and do it when you have the time. ~Alex

Id just move the steering shaft. Just use a bearing support or something. I may have to do that in my s13 with a twin turbo VQ30... ~Alex

The problem is the wategate cant bleed off the exaust pressure that "powers" the turbo. It could be large egnough and the exaust just flows past the wastegate or it might be too small for an efficent turbo. Get some pics of your WG setup that might help. ~Alex

Also if you search for L28DE you wont find what you need. ~Alex