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Discussion Starter #1
This would be my first engine mod, but I'm concerned about all the overboost/limp problems that I've read. How much of a problem will this be with the stock 1.8T engine in a 2002?

Another q: Is it worth getting for an automatic with Tip?
 

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I can't comment on it's effect with a Tip, but if you plan on staying unchipped, then you have absolutely nothing to worry about. Overboost is somewhere around 24psi, and with a J valve, you won't go much above 10 or 11 psi (I only see 9.5psi in my '99).
If you do chip, the J valve is safer than the H valve (which will more than likely send you into overboost), and the word on the street is that the J valve allows for smoother driving than does the H valve.

So, in other words, go for it! It's a cheap and easy mod that will net you a few hp. :thumbup:
 

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Discussion Starter #4
I forget, about how much PSI = 1.0 bar? Cuz I was thinking about getting a Wett chip eventually.
 

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I have an '02 Tip w/Giac and the "J" valve. I haven't gone limp yet but the weather is just starting to warm up. I was spiking at 22-23 psi around the low 30 degree range weather wise. It's well worth the upgrade for the driveability plus you get a couple of extra psi. I was spiking at 18 prior to putting in the "J".
 

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I recently got chipped with APR, and just yesterday bought the N75 H valve. Last night I spiked at 21 psi without the new valve installed. So, Im sure that with the H valve I will get a good 23-25psi spike atleast, on a good cool day.

BTW '98 1.8T APR AEB 5speed manual with 103k miles. :lol:
 

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I have an 01 with a Wett chip and had to sell mine cause i kept overboosting :( i still miss it cause it gave me noticeable more power. Tho i'm not sure if somehow the overboosting was caused by me having a bad MAF at the time also....
 

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<sure to cause multiple answers >

What is deemed the best source (or couple of sources) for the N75J?

TIA
 

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hi,pardon my ignorance but what does this valve do and where does it go.i have a 99 1.8t se and cant afford the re-map yet,so a cheap way of gettin more boost sounds cool to me! :???:
 

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Kind of like Viagra :D It even holds the boost a little longer. I know my wife wishes I would spend as much time and money on her.
 
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Spanky McGee
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