Question about Toyota Supra

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Mk3 Supra Turbo Boost Gauge Problems

My 87 Supra Turbo has a stock Boost Gauge that doesn't seem to read until it's under heavy boost. I'm new to turbos so I'm not sure where to start. Any ideas?

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  • Anonymous Feb 23, 2010

    No, I'm familiar with turbo lag. What's happening on the gauge in this instance is that it is NOT a gradual spool up. What the gauge displays is absolutely no boost, and then it spikes to 6psi. It's as if the gauge is sticking, and then breaking free and measuring accurately.

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The gauge is working fine, the turbo will not kick in untill the engine is spinning fast enough, as the turbo is propelled by exaughst from the engine. So, you can drive around normal and never use the turbo, and climb in the gas and spool the turbo up, what you are noticing is called turbo lag, which is the biggest down fall when compaired to superchargers!

Posted on Feb 23, 2010

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My 88 toyota supra shuts off when it make boost


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What feeds the boost gauge? On my 87 Supra Turbo, my boost gauge isn't working properly. Is it vacuum operated? Or are it's readings supplied by the MAF or MAP?


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I want more boost out of my stock 87 Supra Turbo. Not to sound totally clueless, but is there some kind of adjuster on the turbo to turn up? I'm just now leaving the world of carburetors.


hey mate,

You can get a aftermarket part for your car called a boost controller there are many different types manual and electric, if you go to your local car parts store and ask for a boost controller there is a type called a bleed valve which works by restricting boost to your actuator which controlls the wastegate causing it to open slower than it usually would therefore creating more horsepower... * BE CAREFUL THO AS STANDARD ENGINES, ESPECIALLY OLDER ONES CANNOT HANDLE MUCH MORE HP THAN THE FACTORY SETTINGS *

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Power loss and black smoke?


I had a similar issue to this after I got in a VERY small fender bender (literally) in an 87 Turbo Supra. In my case, my pasenger fender got pushed in JUST enough to crack a charge pipe and cause a boost leak.

Basically, what was happening was the turbo would spool and build boost, the mass fair flow sensor would read all this air coming in and tell the ECU to dial up the the appropriate amount of fuel. When the air reached the cracks in the charge pipe, it would escape out of them. Thus there was a much lower air-to-fuel ratio, causing less fuel to combust, which lead to power loss and black smoke out of the exhaust.

My guess is either an oxygen sensor, or more likely a boost leak.

Good luck mate.

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First things first. Do not bother trying to use the stock boost gauge in that car, it runs off of the ECU and it estimates with small calculations what the PSI may be, the stock boost gauge is ushally 2-3 psi off.

What i recommend is getting yourself an aftermarket boost gauge you can get em used locally on craigslist or a cheapy one from a reputabile ebay power seller. or pick one up for 40-60$ from autozone.

After you do that mount it in a good location, they are very very simply to install, if yours does not come with an instruction paper, you can search boost guage install on dsmtuners.com or yahoo or google.


BUT BY ALL MEANS DO NOT TRY TO FIX THE STOCK GUAGE, YOU WILL NEVER KNOW THE ACTUAL PSI READING.

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Doesn't seem that the turbo is working


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