boxerfan

Alrighty.... now my 1989 200TQ is finally running right I'd like to get some more jam out of it. I've got a spare cap from the wreckers and I should have a new bolt to make the boost adjustable in short order.

1) How much boost can you run before the ecu can't make the fuel rich enough that things begin to burn?

2) If an ECU mod is necessary... what do you guys recommend? I've hard people slam TAP's offering... and I've heard good things about a one man operation in Washinton State. What's the verdict from those of you who have done the upgrades?

3) If you have done the cam too... what did it cost and what was the hp gain over just the ecu and spring mod?

4) I've heard that with new cam, larger turbo, ecu, and waste gate mods that seeing over 400ph is easy and the cars are still very streetable. Is this true? Running top pump gas still?

Curious for your feedback fellas.

Thanks in advance;

Boxerfan

Type44Q

"I've heard that with new cam, larger turbo, ecu, and waste gate mods that seeing over 400ph is easy and the cars are still very streetable. Is this true? Running top pump gas still?"

1989 (single knock sensor equipped turbo 10v, known as MC-1): QLCC chip + spring ~$100

1989.5 (double knock sensor MC-2): read this thread:

https://forums.audiworld.com/v8/msgs/40671.phtml

BTW, your stock fuel injection will probably only be good for ~250hp worth of fuel delivery (or so they say); read previous posts re: something called "Megasquirt" for what seems to be the best way to address that...

boxerfan

I've got an early car so it is the MC-1. Where do I find the QLCC chip and spring? Have you done this mod? What did it give you in terms of gains? Will it reach close to 250hp?

Thanks;

Boxerfan

boxerfan

If the CIS can keep up, will the ECU allow it to? and that is keeping up with the boost fuel requirement if the spring is adjusted? What bar boost translates into about 250hp?

Thanks again...

Boxerfan

SteveAngry

Get this chip and you'll have an instant, dependable 12 psi and 220 hp...

Steve
Michigan<ul><li><a href="http://www.homestead.com/Ben_Swann/qlcc.html">http://www.homestead.com/Ben_Swann/qlcc.html</a</li></ul>

boxerfan

Thanks...and what about a pop of valve? Don't want to hurt Misieu Bibendum do we... ;-)

SteveAngry

A "pop off" valve is used on race/rally cars as a overboost device so they don't blow the engine up...

A bypass valve is probably what you're refering to?

A bypass valve that is installed CORRECTLY will bypass the boost pressure back into the low pressure side of the turbo when you slam the throttle body shut.

Yes, anyone running above stock boost pressures should look into installing one. It will helps save your turbo and your intercooler from blowing apart.

Steve
Michigan

Type44Q

Maybe 2.0bar? Somebody more knowledgable than me would know for certain...

birdmanmt

BPV just makes driveability soooo much better too....very good upgrade!

boxerfan

OK... any recommendations?