Miata Turbo Forum - Boost cars, acquire cats.

Miata Turbo Forum - Boost cars, acquire cats. (https://www.miataturbo.net/)
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Faeflora 04-24-2012 07:12 PM


Originally Posted by sixshooter (Post 869368)
14psi at 1800rpm is stupid. High cylinder pressure at low RPMs is incredibly hard on an engine. I guess since nobody expects a vw to run very long it's NBD.

You're gay. Combustion chamber psi is already at like 200psi before combustion.

Joe Perez 04-24-2012 08:40 PM

1 Attachment(s)

Originally Posted by Faeflora (Post 869523)
You're gay. Combustion chamber psi is already at like 200psi before combustion.

https://www.miataturbo.net/attachmen...ine=1335314424

18psi 04-24-2012 08:43 PM

Retune your forester on 87, report back with logs and gas mileage results.
I'll be here laughing at your dumb ass

y8s 04-24-2012 10:31 PM


Originally Posted by sixshooter (Post 869368)
14psi at 1800rpm is stupid. High cylinder pressure at low RPMs is incredibly hard on an engine. I guess since nobody expects a vw to run very long it's NBD.

frankly it sucks to drive cars like that too. turbo diesels in europe, tiny turbo gas engine cars, whatever. they feel very nonlinear or even regressive. like there's no point in using more revs.

the mini is a little like that. i want to put a bigger snail on it. not much bigger, just one that spools above 2500.

viperormiata 04-25-2012 12:35 AM


Originally Posted by sixshooter (Post 869368)
14psi at 1800rpm is stupid. High cylinder pressure at low RPMs is incredibly hard on an engine. I guess since nobody expects a vw to run very long it's NBD.

Two of my close friends have 1.8t gti's. I hate driving them. One is a k03 @ 15psi and the other is a k04 @ 24psi. Driving around town is horrid in both cars. Boost comes on so fast that you roast 1st through 3rd just trying to get up to highway speed. I hate the stupid electronic throttle body that VW uses. Seriously, it's either none of it or ALL OF IT. No in between.


Originally Posted by GTI (Post 869512)
As long as you do the maintenance the MKIV's last a very long time. I can't even count how many people I know over 200k on a stock block running twice the stock boost.

:rofl::rofl::rofl::rofl::rofl::rofl:

GTI 04-25-2012 03:35 AM


Originally Posted by viperormiata (Post 869634)
Two of my close friends have 1.8t gti's. I hate driving them. One is a k03 @ 15psi and the other is a k04 @ 24psi. Driving around town is horrid in both cars. Boost comes on so fast that you roast 1st through 3rd just trying to get up to highway speed. I hate the stupid electronic throttle body that VW uses. Seriously, it's either none of it or ALL OF IT. No in between.



:rofl::rofl::rofl::rofl::rofl::rofl:

I have a Ko3s. So it's not as bad as the Ko4 on tires. But I still can't full throttle in first, and only second when it's completely dry. 3rd-5th is really fun though. The nice thing about this turbo is in 5th and 35 mph I don't have to shift to go up a hill... or pass someone, it just pulls. I completely agree about the throttle body. And the maintenance comment is a little funny, because the maintenance is unbelievably bad. They also suck to work on. As a friend puts it "Because Volkswagen." I do love the car for a daily though.

elesjuan 04-25-2012 08:42 AM


Originally Posted by viperormiata (Post 869634)
I hate the stupid electronic throttle body that VW uses. Seriously, it's either none of it or ALL OF IT. No in between.

What you've just described is 98% of <30 Honda crowed at an auto-x, their linear throttle turns binary.

I agree completely about tinyturbo VWs. Neighbor has one, part throttle driving up the street he's at full boost before the car has traveled 10 feet. Not fun to drive.

Opti 04-25-2012 09:59 AM

Friend just picked up a TDi and first time I rode in it I kept telling him to get his foot out of it. All I heard was turbo turbo turbo. Then he told me he was barely giving it any throttle.

GTI 04-25-2012 10:15 AM

In stock form it wont boost until half throttle, it only does half boost though. It wont do full boost until > 75% throttle.

skidude 04-25-2012 02:17 PM

In stock form, I actually liked my mom's 1.8t passat. It wasn't quick, but it had enough to keep me entertained, and their electronic boost control does a pretty good job making it feel like a bigger engine than it is.

soviet 04-25-2012 02:40 PM

Manufacturer recommended octane? Bitсh please, I built my engine, hence, I am the manufacturer.

Joe Perez 04-25-2012 03:07 PM


Originally Posted by skidude (Post 869887)
In stock form, I actually liked my mom's 1.8t passat.(...) their electronic boost control does a pretty good job making it feel like a bigger engine than it is.

If it's anything like the Volkswagen CC I drove a couple of years ago, it did in fact feel like it had a much bigger engine. Specifically, one of the coal-fired steam engines from the HMS Dreadnought. You request an increase in throttle, and then some period of time later the engine room responds and you begin to accelerate.

skidude 04-25-2012 03:27 PM


Originally Posted by Joe Perez (Post 869902)
If it's anything like the Volkswagen CC I drove a couple of years ago, it did in fact feel like it had a much bigger engine. Specifically, one of the coal-fired steam engines from the HMS Dreadnought. You request an increase in throttle, and then some period of time later the engine room responds and you begin to accelerate.

I did kind of notice that, but not to the same extent you describe. It was certainly more responsive than my current turbo, though the immediate throttle response off-boost was always hampered by the useless manumatic transmission equipped on that car. At least I blamed it on that, perhaps it was the engine.

Scrappy Jack 04-26-2012 06:07 AM

Funny how perceptions are different: some people complaining about spool up being too quick and Joe complaining about lag.

18psi 04-26-2012 11:11 AM

/\ beat me to it. +1

This thread makes me laugh.
Just about everyone on here is rocking a 2554 or 2560 turbo because they want as much torque under curve as they can get, then we talk about a car that makes ALL of it under the curve, and suddenly everyone hates it. There is no winning.

(though I think Joe was talking about transient throttle response not lag)

Faeflora 04-26-2012 11:41 AM


Originally Posted by viperormiata (Post 869634)
Two of my close friends have 1.8t gti's. I hate driving them. One is a k03 @ 15psi and the other is a k04 @ 24psi. Driving around town is horrid in both cars. Boost comes on so fast that you roast 1st through 3rd just trying to get up to highway speed. I hate the stupid electronic throttle body that VW uses. Seriously, it's either none of it or ALL OF IT. No in between.



:rofl::rofl::rofl::rofl::rofl::rofl:


If I could set it up to work properly, I would have anti lag running during cruise.

Joe Perez 04-26-2012 12:18 PM


Originally Posted by 18psi (Post 870308)
(though I think Joe was talking about transient throttle response not lag)

Yeah, it was definitely the mapping of the "throttle" that screwed me up, not the turbo. At low rates of pedal application (such as when starting from a stop) there was a noticeable latency in the response of the engine to input from the pedal, which made it seem as though there was a dead-band at the top of the pedal's range. My natural reaction to this was to then apply more pedal more abruptly, whereupon the car would lurch forward.

Very annoying, and very uncivilized in what otherwise appeared to be a highly refined and costly sedan.

This was a Euro-spec diesel, so maybe the US-spec petrol cars are different. I've not driven one here in the states.

Braineack 04-26-2012 12:50 PM


Originally Posted by 18psi (Post 870308)
Just about everyone on here is rocking a 2554 or 2560 turbo because they want as much torque under curve as they can get, then we talk about a car that makes ALL of it under the curve, and suddenly everyone hates it. There is no winning.

I live my life 0-4000RPM at a time....

of all if means a realistic rev limiter :)

18psi 04-26-2012 12:50 PM

drive by wire is a magnificent thing when you're able to adjust/tune it.
on 32bit ecu subarus its a map with rpm and throttle angle on the axis and requested torque as the values in the cells. PURE GENIOUS. tune it to your liking and you get even laggy un-responsive subaru's to react to your inputs almost like a high strung honda. seriously impressive. wish you were closer to us Joe so you could drive my forester. I think you'd be impressed.

18psi 04-26-2012 12:53 PM


Originally Posted by Braineack (Post 870358)
I live my life 0-4000RPM at a time....

of all if means a realistic rev limiter :)

I dunno wtf you're even trying to say in here.
But my response is:
I make 200wtq before 3k rpm, your argument is invalid.
COME AT ME BRO:party:


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