Miata Turbo Forum - Boost cars, acquire cats.

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G_Wheezy 10-26-2015 06:26 PM


Originally Posted by 18psi (Post 1278652)
Please explain this to me, because I have no idea what you're talking about

Well I was under the impression that the reason ITBs are desired is because of the immediate throttle response they give. Turbos have to spool up before they deliver peak power, so ideally the ITBs help with the low end until the turbo spools.

Just kind of a silly idea more than anything.



sixshooter 10-27-2015 08:40 AM

Well, ITBs typically come at the expense of intake runner length. Intake runner length is carefully calculated to generate low end torque through harmonics. A really short runner will lose huge amounts of torque (and therefore horsepower) below 5 or 6000rpm but will gain some power above that. If you have a high rpm race engine that is designed to operate exclusively between 5000-9000rpm they are really useful.

Throttle response is something people talk about when they aren't making real power. Drag racers don't need it because they are already revving up prior to launching. Road racers don't need it because they are rolling into the throttle from the middle of the turn as traction will allow (unless they suck and are just stomping on the throttle as soon as they get onto the straight).

If you are worried about boost threshold being low enough for your driving habits, then pick a small turbo. I choose to have a larger turbo for the sake of lower intake temps and reduced exhaust backpressure. If I stomp on the throttle below 3000 rpm on the track then I'm doing something wrong. I should have downshifted. But I understand that value on the street, and it is a useful trade-off to go with a smaller turbo for street use for this reason.

A modern turbo will generate positive pressure within a fraction of a second if it is within it's operating range. For mine, that is above 3800rpm and up to redline. Good luck!

psyber_0ptix 10-27-2015 08:45 AM

Makes me miss my s50 swapped e30, until I remember I was never happy with the suspension even with TC Kleins and Bilsteins. That rear semi-link trailing arm, yeesh.

Welcome to forums.

G_Wheezy 10-27-2015 09:32 AM

Yeah compared to the Miata the E30 is a nightmare. EVERYTHING in that car is different compared to the Miata as far as feel goes. I got so used to the E30 hating me every time I did something that when I jumped in the Miata all the friendly feelings I got from driving it were so foreign. But yeah I love my E30. She needs a lot of work to get her more street friendly though.

Suspension is another priority for me as well. The suspension on the Miata is stock and is surprisingly still really, really good. I would like a little stiffer ride, though, just because I'm used to it. I'm going to start searching for a nice set of coilovers.

Another thing that I'm worried about is the clutch. The clutch is so different between the Miata and the E30 that I'm worried I'm going to prematurely destroy it. The E30 clutch is a Stage 2 so it's very heavy, the Miata clutch is like stepping into a bowl of marshmallows hah. Not used to all the travel.

psyber_0ptix 10-27-2015 03:12 PM

2 Attachment(s)
Once you replace the clutch while doing a swap, that should help some.

Shameless plug

https://www.miataturbo.net/attachmen...ine=1445973174
https://www.miataturbo.net/attachmen...ine=1445973174

G_Wheezy 10-27-2015 03:23 PM

Damn she's nice! Northern VA, huh? I just moved off the Eastern Shore of Maryland.

psyber_0ptix 10-27-2015 03:27 PM

That was when I was in Rhode Island. Built it, went to Germany for a year for study/internship at BMW, then returned and sold it to build a Miata. It was a fun car and great how many parts could be frankensteined together from other BMW's and Porsches. Alas, it didn't win my heart and it was time to move on.

Gibbs 10-27-2015 03:30 PM

Welcome to the DFW area! As far as ECU's go I can't recommend anything other than one of Reverant's Enhanced MegaSquirts.

G_Wheezy 10-27-2015 03:33 PM

Thanks Gibbs! I'll have to take a look. I was leaning toward a Megasquirt so I'll give it a gander.

Gibbs 10-27-2015 03:37 PM

It's honestly the best way to go. There is tons of forum support and knowledge to help get you going.

G_Wheezy 10-27-2015 09:15 PM

I sent him a PM. Hopefully he can hook me up with something.



G_Wheezy 10-27-2015 09:51 PM

As far as aesthetics go, not sure if I like the RacingBeat bumper or not. I really like the GV lip and was considering seeing if it can be made to fit it while not looking stupid. Otherwise I may consider going back to the OEM bumper.

G_Wheezy 10-31-2015 08:30 PM

Happy Heckoween guys! Talked to Reverant and I think I'm going to go with the MS3 ECU that he offers. That way, I can use it to tune the 1.8 in it now, and can still use it when and if I upgrade the 1.8 to one with VVT.



sixshooter 11-01-2015 07:12 AM

Good plan

G_Wheezy 11-04-2015 11:02 AM

I'm going to be in the market soon for some new suspension; apparently I lied about the current suspension being good. The front struts are blown :/. I'm looking at some different coilover options so if anyone can recommend me some good street ones I'd be happy to consider them. Currently looking at Bilsteins, Megan coilovers and Stance GR+ coilovers.

turbofan 11-04-2015 11:42 AM


Originally Posted by G_Wheezy (Post 1280990)
I'm going to be in the market soon for some new suspension; apparently I lied about the current suspension being good. The front struts are blown :/. I'm looking at some different coilover options so if anyone can recommend me some good street ones I'd be happy to consider them. Currently looking at Bilsteins, Megan coilovers and Stance GR+ coilovers.

Only one of those is a good option.

G_Wheezy 11-04-2015 11:52 AM

Can you give me anything else? Lol. I'm guessing you mean the Megans.

18psi 11-04-2015 12:17 PM

.....if only we had like, a suspension thread, or something

:giggle:

turbofan 11-04-2015 12:19 PM


Originally Posted by G_Wheezy (Post 1281008)
Can you give me anything else? Lol. I'm guessing you mean the Megans.

BRRRRRT try again

G_Wheezy 11-04-2015 03:15 PM


Originally Posted by 18psi (Post 1281019)
.....if only we had like, a suspension thread, or something

:giggle:

I did some searches and the only *useful* thread I could really find on my specific question was how to reuse bilsteins from an NB. I guess that could be an option but I don't have anything as far as aftermarket suspension goes so I wasn't sure if that was the best option.

You'd think there'd be some sort of "Rate Your Suspension Here" sticky or something.


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