His site says he's running 9.7:1 c/r. Is that a typo or is that just old info? I can't see 273HP naturally aspirated with a 9.7:1 c/r.

 

who does intake porting, and how, i think thats my weak spot, i got the airflow till there, but it bottlenecks after the port match, and i need a better header, its limiting as can be, ill order one from the site j posted. did you balance the bottom end. is it ness. for 7000rpm frequently. and where do you get injectors, and what ecu setup. i want more power.

 

Nope, it's really 9.7:1 CR. Dave (Rebello) is one of the premiere L6 engine builders in the US. The other is Sunbelt Racing, but I'm not sure who's working there anymore.

 

Now? Almost no one. One of the biggest limiting factors on the fuel injected L6 motors is the use of 1.25" intake runners when the carb'd models have 1.37" runners. That 0.12" may not sound like a lot, but when it comes to air volume, it adds up VERY quickly.

It was done with a custom made grinder. Think of a modern Dremel tool with the flexible tip and an aluminum grinder head. It was truly a work of art as that is what it was back then. Back then, these guys were artists with great mechanical aptitude.

Yes, I would always balance the bottom end. Even when I'm not planning to spend a lot of time at 7000+ rpm, it just makes everything "FEEL" smoother. I'm sure some of it is psychological and the additional cost may not warrant it depending on your machine shop, but it's definitely worth it to me.

I was using a second hand Electromotive engine management system that I bought off an SCCA Pro-racer. This was a pre-Tec1/2 Electromotive system. You can do the same thing with a $350 MSnS-E EMS now. It boggles the mind what is possible now with so much less money... ;(

 

I've heard of Rebello, and have actually contacted them before about head work (never went through with it). Sunbelt is an unknown to me though.

Now thats old

 

You're tellin' me!?

 

Some of the best headwork I have seen on L engines was done by B. C. Gerolomy. At one time, he was the hot ticket on ITS engines.

AT datsun dynamics, we got a bunch of electromotive L-28s and were able to see exactly how devendorf did so well.

 

Hey... have ya found out what the 280zx rev / speed limiter is set at???

 

Like I said..........We'll see when I have time (meaning free time at work) to put it on the tester which duplicates all the signals from the car.

 

I have heard and seen what happens when you take a 6cyl z motor past 7500. I was told if you pass 7500 even on a balanced engine the motor has bad harmonics and becomes unbalanced then flys apart. this is do to the fact that the z motors are not fully counterweighted engines.
But on a lighter note I have had my 79zx with motor work, airdam, and zxr wing to 147 at MIS speedway

 

Welcome to ZDriver! You have a web page?

 

Maybe if you have a 280zx turbo available you can run it on the lift and see for yourself.

 

In an earlier post in this same thread, I said:


I've rev'd L28's & L28ET's well past redline before, and I've taken my 280ZXT (WHICH IS A 280ZX TURBO) up to 139mph (driving next to my buddy in his C5 Vette), so I know there is no rev / speed limiter. About your Z crapping out when you changed gear ratios... maybe your Z needs a tune-up.

Did you also miss this post by L-Dub?

BTW... I've been sarcastic this whole time about showing me what the rev limiter is set at....

 

there is no rev limiter on any 280zx that i now of... but i did see a honda civic Si 2005 have a rev limiter it stoped at likr 5,000 rpms... " i would personally never take my 280zxturbo to red... unless nismopick said so lol jk.. even if my car was modied to the max..

 

Naw... I beat the crap outta my L28 only cuz I had my L28ET ready to transplant in. If you've ever seen my video where I was doing donuts (aka burnouts) with a black C4 vette.... that was the day before I pulled my engine to do the transplant.

 

run it for all its worth if it breaks it needed replaced.

 

Any relation to John Coffey?

I assume that was on Dave's engine dyno? So that should be about 245 to 255 rear wheel hp. Is your 280 block bored and stroked? What's the current displacement?

B.C. Gerolomy used to be one of the best L series engine builders in professional racing. Major props there.

The only two serious builders left are Rebello and Sunbelt, but as I mentioned earlier, I don't know anyone that currently works at Sunbelt, so I can't attest to any of their current quality. Dave on the other hand is crankin' 'em out in Walnut Creek (10 miles from my house - I buy all my rebuild parts from him directly) as usual.

 

My 1981 ZX with an auto would float the front end at 135mph, but it felt like it still had more to go, I just couldn't keep the front tires down. The air damn under the nose was busted up from a P.O. so I think that might have been why.

 

Yeah Friday night I took my '82 to over 5000rpms. And I had the needle buried for a short time. I am sure I was doing 130-140mph, and he kept climbing to do more. And also he didn't float, he stayed right on the ground, and was sailing along.

 

for all those who might be interested I came across a speedometer/odometer that has no cables just 3 wires and it connects through a gps system. the top speed showing on it is 160mph. when i get back home i'll look for the website again. not really sure if it will work on our cars but i bet there would be a way to rig them so we could.

 

Hey Thread : have a 87 Chevy blazer LT1 trick out 400 turbo tranny rated 480 and a 83 280zx turbo and did them together and 280 beat off but when it reach it at 112 the blazer got it at 117 and i was doing 128/130 but got me over that but temp started to rise to about 212 in the z and i pass my z at 138. if this will help.

 

Man... you drink too much tonight? That was a lot of nonsense.

You "did them together and the 280 beat off" ???? LoL...

 

sounds like the good old days

 

Yeah, I gotta say... For someone of advanced years, his posts are very hard to follow. I thought it was just me for a while.

Rod.