preith

I realize this is an old post, but I just wanted to throw in my $.02. I have an 8 gallon cell, only do sprint races, and it's not large enough. Well there's BARELY enough fuel for a 1/2 hr session depending on the track. Part of my problem is the fuel pick-ups, I don't have a surge tank or enternal box to pick up every last drop, but after a session it has less than an inch in the bottom. In my club there are a few events which are 40 minutes and this being my first year, I've had to duck out early and just take the novice sign off (at least 1/2 the leader's laps).

Jetting may fall into the "black magic" realm but this is pretty straight forward, or at least to me. Basically the holes which are epoxy'd shut were originally the vent holes for the float bowl. This simply keeps the bowl from being pressurized and allows fuel to flow in. What happens under high g-load right handers is the fuel sloshes over to that side, comes up through the holes and then flows over on top of the jets. This causes an extreme rich situation because the air jets are being blocked off completely.

Thanks for the photos. It looks like they did in fact epoxy shut the bowl holes as well.

On somewhat of a different note, I'm really looking forward to watching the Goodwood Revival on Speedtv. Does anyone know when that will air? EDIT: Ok, I'm a bit confused now. I was google searching for this and I can't remember which one is Goodwood Festival of Speed, and which is Goodwood Revival. Basically I'm interested in the one with actual wheel to wheel racing.

Not to beat a dead horse here, but as far as I know, you have to do more than just vent the bowl. If you end up venting the bowl on the large cover, you can then epoxy the holes in the jet chamber area shut (the ones which allow the fuel to flow in from the bowl). Keep the end open then to vent the jets. Phil

Basically that's what I was trying to point out in my previous post, keep the fuel off the jets. It sounds like my modifications are diferent from Tom's, but accomplishing the same thing.

IMO the stumbling cannot be corrected by running a lower float level alone. Beleive me, I have tried it. If there are others out there that don't have any problems I'm all ears. I road race my Z and feel the higher G-forces inherent with race tires enhance this problem even more. Wolf Creek Racing modifies the carbs extensively to correct this. Unfortunately I don't have any pics, but what I ended up doing was epoxy'ing another piece of aluminum on the float cover so it seated against the rib in the float chamber. I then drilled a single hole in each cover above the jet area for venting and epoxy'd a 90 degree vacuum fitting in it. Seemed to do the trick. Also, Dave at Malvern Racing told me they always ran 4.5psi with a 2mm seat in every one of their road racing cars. Just an FYI, but Dave passed a few years ago now and the business has subsequently folded. As for the dual pumps question, I have a two pick-up fuel cell and originally had a pair of solid state Facet pumps. I found that even with two it wasn't able to maintain enough fuel pressure at higher rpm's. I switched to a single Carter competition pump (which flowed more than both the Facets) and don't have the issue anymore. I also have two pick-ups feeding to the single pump and do have problems once the fuel gets low. I'm going to install a surge tank this winter to correct that.

If my memory serves me correctly, the hazzards will still work even if a bulb is burnt out. I'd be willing to bet this is the case.

Once again great pics. I'd LOVE to see some GT2 pics too if you have 'em.

And kicking but it is. I'll try not to brag too much. I actually find it surprising more than anything, but I have NOT come across any car other than V8 powered ones and an XKE, which has more straight line speed including other Z's. I'm still pinching myself from a recent race at Gingerman where it out dragged 3 911's on the opening lap. And this is from a motor which technically can be more powerfull (has the 2nd largest Schneider cam) I have to admit though, they had me in the turns. This is my first year racing, so hopefully my driving skill and car prep will only improve.

Thanks for the compliments guys. It's really not as nice as it looks in the pics, probably a 15 footer. With that said I have heard from a few different Council members that it's too nice. But in vintage you're not taking the same risks as other classes. Here's some more pics for anyones who's interested: zdriver gallery HybridZ gallery - all on-track pics

Great pics, thanks. It was understood that Greg now has Grayson's old Z. My question is what's Grayson up to now? Is he done with EP, or are the guys at ERadz (spelled right??) preparing another car for him? I'd be interested to hear more on the Porch (Porsche) syncros.

Looks like Mr. Ira did pretty good, 14th, at the Runoffs. I didn't see Doug Piner's car, but Don Ahrens was the highest placed Z in, 6th. I always root for my local guy, Ken Kannard, but it looks like he DNF'd early in the race. Anyways I'm looking forward to watching the race....in 2 months on Speed! 2005 Runoffs EP results here What happened to Grayson Upchurch? From the previous posts I understand they sold the car, but he's nowhere in the lineup. Did they just give up? Maybe building a car for next year?

Hey guys, my first "official" post. At HybridZ they're always harping on the newbees for not searching, and I'm assuming this has been covered here before. Anyways, the US market 77-78 doors have a completely redesigned latch assembly and are not interchangable with the earlier ones. But technically a 240 door will fit a 280, as long as it's a '75-76. I have a '76 door on my '73 now. The door beam in the later makes it way heavier, but I gutted out the entire door anyways and cut it out (road racer).

Hello everyone. I thought I'd introduce myself. I've known about this site for a while now, but for some reason didn't think to join in on the fun. It looks like I'll be right at home here, there's a few familiar names. I'm also a member at HybridZ, Zdriver.com, and was an early member of the IZCC, back in '94??. I got my first Z, a rusted out '77, when I was 19 and have never looked back. I now road race a 240 with Midwest Council Sports Car Club's vintage/historic group.