Miata Turbo Forum - Boost cars, acquire cats.

Miata Turbo Forum - Boost cars, acquire cats. (https://www.miataturbo.net/)
-   Build Threads (https://www.miataturbo.net/build-threads-57/)
-   -   LFX Build Thread (https://www.miataturbo.net/build-threads-57/lfx-build-thread-83090/)

thebeerbaron 04-01-2015 02:52 AM

Jumping back a ways, since I think I may have misunderstood you.


Originally Posted by carnut169 (Post 1215095)
Stock camaro shifter does not align. I'll have to cut/ weld and remove some material/ length. Hood clearance will be tight as is everything- some things less than 1/16- lots within 1/8". Makes me really appreciate what the v8 guys must go through!

Is this referring to the hood clearance only, or are these clearances to other bits of the car? Those sound way too close to allow for any sort of normal engine movement.

Full_Tilt_Boogie 04-01-2015 09:34 AM

Why would you allow the engine to move?

carnut169 04-01-2015 09:39 AM

Engines do move a bit- it's normal- the stock Miata engine really moves quite a bit! The engine mounts are rubber so that the vibration/ harness is dampened.

V8r's engine mounts are MUCH more solid than a stock Miata. Poly bushings will only allow the engine to move slightly. I think it will be fine.

ThePass 04-01-2015 04:26 PM

I believe Full Tilt Boogie was being facetious.

But yeah, the V8R mounts will reduce movement a good bit.

-Ryan

carnut169 04-25-2015 08:12 AM

4 Attachment(s)
The car is now drivable. I still have to figure out why the coolant is not circulating- I expect that I've still got air in the block, but I did drive it down the driveway and back up- everything is working! I can tell already that the car will be RAW and FAST. Pretty much all of the rubber isolation stuff and sound proofing is gone, so she's very racy.
Still have some minor sorting to do- connect CAN lines to dash, wire fuel level sending unit and brake lights, alignment and scale but she's alive!
Click for video:
http://img.photobucket.com/albums/v1...psnwzj9egg.mp4

https://www.miataturbo.net/attachmen...ine=1429963974

https://www.miataturbo.net/attachmen...ine=1429963974

https://www.miataturbo.net/attachmen...ine=1429963974

https://www.miataturbo.net/attachmen...ine=1429963974

http://img.photobucket.com/albums/v1...pstdttf6ua.jpg

concealer404 04-25-2015 08:15 AM

Unf. That last picture.


I need a moment.

OneTwo 04-25-2015 08:57 AM

Good lord that's sexy. Time to give my flip ups an eviction notice.

Any plans to relocate the lighting elsewhere?

1993ka24det 04-25-2015 11:09 AM

Yours looks good, can't wait for a video.

mines getting there, just working on getting some mock up motor/trani brackets

1993ka24det 05-11-2015 05:59 PM

What the update...

cordycord 05-31-2015 01:31 AM

Earth to Carnut.

carnut169 05-31-2015 08:12 AM

Yeah, I'm here.

Driven the car roughly 100 miles now. Doing The Jzilla Track day at Road Atlanta on the 8th.

I added a header tank to help bleed the system and now its fine- stays around 180'. Also got the dash up and working using the OBD2 protocol from AIM. Veracity built a gizmo that will allow me to display fuel level on the MXL which is neat.

The power steering pump was also an issue- it only lasted about 25m without fluid. However, I found a Dorman pulley (with a bearing) that fir right over the factory ps spline which is threaded, so that's been working great.

I also installed a Vitesse Throttle controller which eliminates the ECU's delays in opening/ closing the throttle. Way more responsive.

I will definitely take some more video on the 8th!

Roda 05-31-2015 09:44 AM

Did you ever get the hood clearance figured out?

ThePass 05-31-2015 01:09 PM


Originally Posted by carnut169 (Post 1236255)
The power steering pump was also an issue- it only lasted about 25m without fluid. However, I found a Dorman pulley (with a bearing) that fir right over the factory ps spline which is threaded, so that's been working great.

Did you happen to save/note the part #? AFAIK V8R doesn't yet have a solution for de-powering.

And now that you're on the road with it, what is your feeling on the getrag 3.42 ratio? That MV5 6 speed has a really short 1st/2nd and a really long 3rd, does the 3.42 make quick work of 3rd gear or does it drag on a bit?

-Ryan

TheBandit 05-31-2015 11:22 PM

Also in for the lighting situation. I have no interest in putting the barn doors back in, and would love to hear your thoughts.

Extremely jelly of this build. Absolutely proper. Hat tipped to you sir.

carnut169 06-01-2015 07:08 AM


Originally Posted by Roda (Post 1236257)
Did you ever get the hood clearance figured out?

Kinda. I've got 2 hood pins and 2 aerolatches securing the hood. It touches. V8R will have a FG hood available soon that solves this with a larger bubble. I'm just going to wait for that.


Originally Posted by ThePass (Post 1236287)
Did you happen to save/note the part #? AFAIK V8R doesn't yet have a solution for de-powering.

And now that you're on the road with it, what is your feeling on the getrag 3.42 ratio? That MV5 6 speed has a really short 1st/2nd and a really long 3rd, does the 3.42 make quick work of 3rd gear or does it drag on a bit?

-Ryan

I ordered the Dorman HELP AC Bypass Pulley 34157

The PS shaft is threaded with something normal- picked up a bolt at ACE. Its spaced with washers and I used red lock tight on the bolt and so far it has not moved.

I *think* the 3.42 will be a good ratio for the track, but for a street car the 3.2x the V8R used would be better. The ratios used in the AY6 trans are a little odd. 1st is a stump puller. Great for burnouts! 4th to 5th is almost the same but 6th is a good bit taller. We'll see...

carnut169 06-01-2015 07:16 AM

Lighting solution? Run during the day! Seriously, I may add some LED light strips.

Lincoln Logs 06-01-2015 05:16 PM

9 Attachment(s)

Originally Posted by carnut169 (Post 1236410)
Lighting solution? Run during the day! Seriously, I may add some LED light strips.

I used (amazon link) for my mini v-mount set up. The lighting is adequate at night...not great but it gets the job done and I don't get flashed by other drivers.

The light mounts upside down onto the bracket.
https://www.miataturbo.net/attachmen...ine=1433193440

https://www.miataturbo.net/attachmen...ine=1433193440

To mount the lenses I had to cut the ends of the housing off in order to get proper spacing.
https://www.miataturbo.net/attachmen...ine=1433193440

Light output at night:
https://c1.staticflickr.com/9/8686/1...b386e899_b.jpg

TheBandit 06-01-2015 08:43 PM

Mmmmm... This is pretty much what I've been thinking as well. Thank you good sir.

You wouldn't happen to have a drawing/model of that fancy bracket you've got would you? :)

Lincoln Logs 06-03-2015 02:50 PM


Originally Posted by TheBandit (Post 1236689)
Mmmmm... This is pretty much what I've been thinking as well. Thank you good sir.

You wouldn't happen to have a drawing/model of that fancy bracket you've got would you? :)

ThePass helped me make these, that would be a question for him. It is essentially a z-bend and it uses one of the bolt holes for the factory bumper to mount. As it sits the lights could be aimed a bit higher but they bleed enough light to really make street signs pop without blinding everyone.

cordycord 06-03-2015 03:01 PM

What are your impressions of the 3.42 and the MV5? For the tracks out here, the MV5 actually seemed like a better choice given the gobs of torque, but bench racing and reality are often at opposite ends of the spectrum.

ThePass 06-03-2015 03:49 PM


Originally Posted by carnut169 (Post 1236409)
I ordered the Dorman HELP AC Bypass Pulley 34157
Amazon.com: Dorman HELP AC Bypass Pulley 34157: Automotive

Excellent info. Thanks.

ThePass 06-03-2015 03:49 PM


Originally Posted by cordycord (Post 1237362)
What are your impressions of the 3.42 and the MV5? For the tracks out here, the MV5 actually seemed like a better choice given the gobs of torque, but bench racing and reality are often at opposite ends of the spectrum.

I just asked that ;)



Originally Posted by ThePass (Post 1236287)
And now that you're on the road with it, what is your feeling on the getrag 3.42 ratio? That MV5 6 speed has a really short 1st/2nd and a really long 3rd, does the 3.42 make quick work of 3rd gear or does it drag on a bit?


Originally Posted by carnut169 (Post 1236409)
I *think* the 3.42 will be a good ratio for the track, but for a street car the 3.2x the V8R used would be better. The ratios used in the AY6 trans are a little odd. 1st is a stump puller. Great for burnouts! 4th to 5th is almost the same but 6th is a good bit taller. We'll see...

6th is basically an overdrive, with a big drop for the 1:1 5th down to 0.75:1. The thing I've tossed between, given a couple of our SoCal tracks that would see a 300hp car over 140mph, is whether it would be better to gear longer so that you don't need 6th at all at those tracks, but be stuck with longer gearing everywhere else, or just go short and accept that you'll need to nudge into 6th on the front straights for WSIR and ACS. You aren't accelerating much up at those speeds anyways, so I've decided it'll be better to go short on the rear ratio.

cordycord 06-03-2015 07:59 PM


Originally Posted by ThePass (Post 1237389)
I just asked that ;)






6th is basically an overdrive, with a big drop for the 1:1 5th down to 0.75:1. The thing I've tossed between, given a couple of our SoCal tracks that would see a 300hp car over 140mph, is whether it would be better to gear longer so that you don't need 6th at all at those tracks, but be stuck with longer gearing everywhere else, or just go short and accept that you'll need to nudge into 6th on the front straights for WSIR and ACS. You aren't accelerating much up at those speeds anyways, so I've decided it'll be better to go short on the rear ratio.

Yes, but I don't pay attention. :)

So if we're considering a 3.46 and a 3.23 rear end and an MV5 transmission, we get the following at 7,200rpm:

3.46 3.23

34 37 1st
65 70 2nd
96 103 3rd
120 129 4th
143 153 5th
170 182 6th

Assuming 205/50-15 tires

So how does this look for your Southern California tracks, such as Streets of Willow, Big Willow, Buttonwillow, Fontucky, Laguna Seca (okay, not SoCal but who doesn't want this on your list)?

Lincoln Logs 06-03-2015 08:03 PM


Originally Posted by cordycord (Post 1237460)
3.46 3.23

34 37 1st
65 70 2nd
96 103 3rd
120 129 4th
143 153 5th
170 182 6th

I've been talking to Ryan here and there about diff ratios and based on this info I feel like it is a 3.73 diff or bust for a track focused car.

cordycord 06-03-2015 08:07 PM


Originally Posted by Lincoln Logs (Post 1237461)
I've been talking to Ryan here and there about diff ratios and based on this info I feel like it is a 3.73 diff or bust for a track focused car.

But....torque!!! Carroll Shelby said horsepower sells cars but torque wins races. LFX has what...278ft/lbs torque?! The first thing I wanted to do once I got the turbo on my car was go for longer gears. I'd think the same thing would happen with the LFX.

Lincoln Logs 06-03-2015 08:13 PM

1 Attachment(s)

Originally Posted by cordycord (Post 1237462)
But....torque!!! Carroll Shelby said horsepower sells cars but torque wins races. LFX has what...278ft/lbs torque?! The first thing I wanted to do once I got the turbo on my car was go for longer gears. I'd think the same thing would happen with the LFX.

Won't argue there, the LFX certainly makes some decent torque. Most dyno sheets for the LFX in Camaros are showing around the low to mid 200's for torque at the wheels. For a pure track focused car, I still think the 3.73 will be a faster combination.

https://www.miataturbo.net/attachmen...ine=1433376788

ThePass 06-04-2015 03:02 PM

2 Attachment(s)
I've got a whole mess of graphs that I've compiled to play with all the different ratio options. The main rub with the trans from the Camaro is the ratio spacing. Here's the Camaro's 6 speed with 3.42 compared to a Miata 5speed with 4.10 gearing to show just how short that 1st and 2nd are:


https://www.miataturbo.net/attachmen...ine=1433445760


For the track, that's a useless 2nd gear, so I believe you're better off gearing for 3-5 use, rather than gearing long and having to dip into 2nd gear ever.

Addressing the real issue though would be to use a different transmission...

-Ryan

kmvguy 12-31-2015 08:34 PM

This is a beautiful build.

How streetable is this swap?
Can you retain AC and PS just like LS swaps?


All times are GMT -4. The time now is 07:50 PM.


© 2024 MH Sub I, LLC dba Internet Brands