Use ky jelly petroleum jelly on the seals when you re-install them.

Will do. I happen to have a lot of ky jelly petroleum jelly lying around.

So swapped them out (I missed having an easily accessible fuel rail) and this had to at least be hurting performance a bit... One was literally missing a quarter of itself. Another crumbled as I removed the injector. The other two only had hairline cracks. Also the o-rings rolled off the fuel injectors with zero effort. I could have probably shook them upside down and they would have fallen off.

https://www.miataturbo.net/attachmen...ine=1374265937

It's like 100000 degrees out so I'm building up courage to go drive and do another log.

I plan to either send in my spare 460s for testing/cleaning or get new injectors soon so hopefully the rubber holds for a bit.


EDIT: Butt dyno seems to think it felt better. It was hard to tell but I think I have full boost by 4000 now. I'll have to set the ebc to 14psi and do a log tonight. It is 105 out so that might effect some stuff.

Well this is a monumental improvement. I wish I would have started the 4th gear pull at a lower rpm... but watching boost it's at 10psi by 3500 which is what koto said was usual. The run started at 4500rpm and boost was near instant.

https://www.miataturbo.net/attachmen...ine=1374292731

That boost looks beautiful. Injector duty cycle remains at ~70 until 5700rpm where it's back up high again which is odd... but the rpm jumped at the same. That boost is dead straight though which I'm very happy about. Below is the first log for comparison..

https://www.miataturbo.net/attachmen...ine=1374292731

Holy schnikes! Those o-rings were new when I last fooled with the injectors, which was sometime in 2009. They've taken a lot of abuse since then though, including long periods sitting (deployments). Fuel smell gone?

WRT the pressure switch: I don't really like that style, no, but it's what came with the DO basic kit. There isn't really a good way to mount it solidly to something in the engine bay and it's difficult to read where you've set the system to turn on. I always aimed for 5 psi. FRT - something to think about if you use that direct port hardware ;)

DC at 90%.. yeah. 460s are just about maxxed out here. Depending on how much you want to mess around with it in TS you might consider upping the size to ~550 and re-tuning fuel. As a bonus, injector technology has improved since the '80s so you'd get the better spray pattern and atomization too.

I've only driven it once since I replaced the o-rings, I did still smell a little fuel. But I had a little fuel spilled when I swapped the o-rings. Judging by the log and how it drove I think it's fixed though. I'll probably just end up sending out my spare set of 460s to DW and have them cleaned.

I'll probably keep boost between 10-14psi so I should be able to keep the 460s.

For the record when I bought the car I didn't think that I'd be getting a brand new car. It's 20 years old, so I'm not worried about having to replace things like this ;)

Moving on to fun things: I found yet another TB. Looks like a 1.8, but it has the exact 4 wire pig tail I need. Cleaning out the garage always nets at least one good find.

But looking at this thing.. it doesn't look like any TB I've seen on a 1.8. Is this an auto one? It is a 1.8 right? It fits my 1.8 intake manifold...
https://www.miataturbo.net/attachmen...ine=1374356440

https://www.miataturbo.net/attachmen...ine=1374356440

1.8 NA TB for sure.

It must be a 94-97 then? It is much different than my 02 1.8 TB.

Anyone recommend some good ways to clean up a TB real good? The 1.6 auto one I have is literally stuck shut... I know they make intake cleaner or some shit, but I never trust anything that comes in a can. Does it work?

https://www.miataturbo.net/attachmen...ine=1374425886

Ya think?

I've always used brake cleaner. Just don't scrub off the black coating on the butterfly edges. Idle will be fucked up and eventually you'll get a new TB.

I wanted to feel special like I figured something out on my own lol.. thanks.. :party:

its a 94 throttle body. They had that weird 2-lever thing for 1 year.

460s + 90% DC = 220-230rwhp.

Also: 460 + fuel leak + 90% dc = 200rwhp

In other news I've decided on my engine. It will be a 1.8 with stock internals. I'll run 10psi daily and 14psi for fun. The AEM EBC makes switching boost painless and stock can handle that easy. I will only have to make small modifcations to make it work. Replacement manifold and typical 1.6>1.8 conversion stuff.

I sent out my 460cc spare set to DW today. So should have some fresh injectors. I'll be doing a reroute when I assemble as well as multi-port WI which will be done on a spare 1.8 manifold. And of course I'll switch to 4 wire TPS.

Here's a stupid question: Will the NA 1.8 Intake Manifold fit on a 99' head?

I know the 99' IM has VICS, which is part of the reason I don't want it. I hate how it loops over so close to the head, making it a PITA to do anything in that region. I know it's really not *that* much of an inconvenience, but whatever. I guess I'll have to see how much of a performance gain I will get from VICS if use it.

Quote from FM: So maybe I should use it... Ugghh seems to be a pretty decent gain across the board from using it..

you want VICS and it takes like, I dunno, 30 seconds to remove the upper half.

Unless you are fitting a squaretop IM, I will ban you if you don't use the VICS IM you have. I extend that to actually utilizing VICS as well...I will ban if you install the head and fail to control the actuator.

If that damn thing is installed it will be working. I just like the openness of the NA manifold. Oh well, one can dream.

how often do you need to fondle your injectors? I pulled the upper for the first time on a car i was tuning (i had to confirm the check valve was in place), it was a non issue and came off easily, without issue, and it wasn't even a deal.

I have a question: why did you make a big stink about me swooping on Joes internals, tell him you really really needed them, only to frikken be gay and stick with a stock internal 1.8?

I said I really needed the engine. I bought the internals thanks to you ;). You can buy them if you want so bad. I wanted the internals for insurance if I decided to go with more boost. But since my goal of 250whp isn't exactly built motor worthy I'll pass them on to someone who will use them. And I never made a big deal about it. If I do sell the rods/pistons it will be for what I paid for them. Either way I haven't 100% made up my mind on anything. Still researching... It's looking like even if I don't use them, unless I reuse everything I have it's going to cost almost the same to do it with stock parts.