924Board.org

[stevekat]

Brian: Depending on the type of run I do, highway to passing speed, from a stop through the gears, or modest speed on a ramp to merging speed, the max boost can be slightly different. Not talking about a lot - maybe 1/2 to 3/4 of a psi.

So while I could choose to set the controller 3/4 to 1 psi higher than 11 or so, and it might not ping 90% of the time under full throttle and heavy load, that leaves some instances based on the variables of rpm, acceleration, and interaction of all my variables that it would. To be safe, and not have pinging at any time, setting just slightly greater than 11psi (maybe its around 11.2) seems to be my limit with 93 east coast octane, about 85 degree temp and a Euro DITC, without any issue.

I think I could easily run 15 psi or greater and get most of the benefit as long as I was listening and lifted at certain high rpm and high load conditions that caused ping. But then you would have to pay a lot of attention Certain ranges of operation would be incredible. But you would get detonation in many circumstances.

At present, I believe I can pretty much run any reasonable amount of time at 11 psi (a DE run for instance) without material adverse effect.

If one thinks about it, with the U.S. cars running stock 6.2 - 6.8 psi, 11+ psi is a HUGE increase, with primarily just an intercooler added (modest size too with the OEM CGT) added. I think my UTCIS-PT helps as well. Reverting to the U.S. DITC box would give my set up about 12 psi, an even greater bump, based on my trial and error testing.
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"Never get out of the boat. Absolutely goddamn right. Unless you are goin' all the way."

Gone to new home: '81 924T, US version, CGT Intercooler, UTCIS-PT, Euro DITC, Greddy Trust MBC, Forged Fuchs Flat Dish 6's, Factory Recaro's.

[ideola]

I'm leaning toward the boostsciences cockpit controller:


And I really like the idea of not messing with the stock actuator line, but rather, using the boost cutoff switch port (the switch is disconnected anyway, why not just remove it) as the signal feed to the controller, and then the controller to the top of the wastegate. Looks like I can get banjo-to-barb fittings at 034Motorsports, so that should be a pretty easy way to plumb things...
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erstwhile owner of just about every 924 variant ever made

[jazz guy]

Ideola,
I like it. Straight-forward, efficient, effective; should work great.

[stevekat]

Looks like a nice solid controller at a reasonable price - also a good basic mount. I used one like this on my original 931.
_________________
"Never get out of the boat. Absolutely goddamn right. Unless you are goin' all the way."

Gone to new home: '81 924T, US version, CGT Intercooler, UTCIS-PT, Euro DITC, Greddy Trust MBC, Forged Fuchs Flat Dish 6's, Factory Recaro's.

[CorsePerVita]

[fiat22turbo]

http://grassrootsmotorsports.com/project-cars/1976-legrand-mk-18/lifeline-fire-system-installation/

http://stockcarracing.automotive.com/49451/scrp-0708-fire-suppression-systems/index.html

http://www.lifeline-fire.co.uk/fireextinguisher/electricalsystemsfia.asp

http://www.pegasusautoracing.com/advcat.asp?CategoryID=FIRESYSTEMS
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Stefan
1979 924 Carrera GTS (clone-ish)
1988 944 Turbo S (Silver Rose)

[Nein37]

After having had my car running at different settings this past year I have to fully agree with Steve's numbers regarding safe boost. During the summer months 12 psi is about the limit with the top mount intercooler and stock turbo. You start seeing pinging at around 13psi on hot days. As it gets colder in October you can start to tweak it up to 14psi, keeping in mind however that the stock turbo is already so far out of its efficiency range its pumping too much heat for good top end power. But man oh man, on a cold day, running 15psi... these cars are transformed.

However, drivability really starts to suffer since the off-boost vs on-boost power starts to get ridiculously far apart. The car goes two speeds slow or fast with nothing in between.
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1981 931 CGT replica, OEM CGT intercooler, .8 BAR WG spring, GTS Headlights, Innovative Wide band A/F, A/C delete, 16" Fuchs, Weltmeister 200lb lowering springs, Bilstein HDs front, Koni Sport rears.

[blurred_line]

How effective is the boost controller with a 1.0 bar spring? Does this cause any problems?
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1981 924 Turbo

[Grenadiers]

My 'armchair' theory, is that you have to turn in the boost knob a bit more before you catch up to the 'normal' boost output with the 1.0 bar spring. Then, any turns in after that will bring up the boost numbers.
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'83 944 Track car.
'88 924S Track car.
'89 944 Turbo
2004 Winnebago Vectra monster RV
2012 Jeep Wrangler
2014 Kia Soul
2001 Ford F350 powerstroke

[Cedric]

[stevekat]

My recollection is you can only go 'up' with a boost controller, ie: you can only increase effective resistance of the spring side. You can not go down. So if you put in a one bar spring, that would become your minimum boost actuation pressure. I'd keep the stock spring so to have maximum flexibility.
_________________
"Never get out of the boat. Absolutely goddamn right. Unless you are goin' all the way."

Gone to new home: '81 924T, US version, CGT Intercooler, UTCIS-PT, Euro DITC, Greddy Trust MBC, Forged Fuchs Flat Dish 6's, Factory Recaro's.

[blurred_line]

So would you be better off staying with a stock spring and adding a boost controller?
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1981 924 Turbo

[stevekat]

As the spring in your minimum, that would be my choice. If you get into some situation where you wanted/needed lower boost ie: you had temporary fuel problem but needed to drive the car at lower boost to get home etc., you have that option. With a stronger spring, that choice is not available.
_________________
"Never get out of the boat. Absolutely goddamn right. Unless you are goin' all the way."

Gone to new home: '81 924T, US version, CGT Intercooler, UTCIS-PT, Euro DITC, Greddy Trust MBC, Forged Fuchs Flat Dish 6's, Factory Recaro's.

[Dutch924-racer]

I have got a Forge in car one, very satified with it.


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937 trackday car
Series 2 engine
951S turbo and intercooler
Fast road camshaft
Forge recirculation valve + boost controller

[blurred_line]

Has anybody used a digital boost controller such as the HKS?
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1981 924 Turbo