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Performance Modifications for the NG900 / Old 9-3 This forum contains PERFORMANCE related Q&A's for the NG900 and 9-3. This may also include suspension.

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Old 02-26-2008, 10:18 PM   #1
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Bypassing coolant lines

In South Africa in summer its 30 degrees C or 86 degrees Farenheit. In winter its 10 degrees C or 50 degrees F. I feel a noticeabe drop in power because of the heat in summer. My friend with a 93 aero has bypassed the coolant lines into the throttel body. He says it makes a big difference in reducing heat soak. What about in winter time though, because the agents tell me that it helps the car warm up in winter? Any thoughts?
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Old 02-27-2008, 12:38 AM   #2
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i did this and it did seem to slightly slow down in the motor heating up but i have no proof of this. since it only gets down to 10c 50f i would say go ahead and do it since it doesnt actually get "cold" if it got up under 36f then id consider changing it back to stock. you could always just bypass it in the summer and put it back for winter. thats what i do and it only takes about 1 minute to do it. very easy
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Old 02-27-2008, 02:55 AM   #3
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I'd bypass it. If it doesn't get below 50 there is certainly no reason to have that hot coolant circulating through your throttle body.

I removed the tb preheater on my 95 Aero and I've never had any problems with it warming up, idling, etc...even in late fall when it gets down to 30ish here.
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Old 02-27-2008, 04:46 AM   #4
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I'd bypass it. If it doesn't get below 50 there is certainly no reason to have that hot coolant circulating through your throttle body.

I removed the tb preheater on my 95 Aero and I've never had any problems with it warming up, idling, etc...even in late fall when it gets down to 30ish here.
Goodstuff. Thanx guys.
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Old 02-27-2008, 05:11 AM   #5
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SA! Neat! So echoing above... it doesnt get cold enough at all where you are to be concerned about it IMO. But if you wanted a quick option to switch back and forth... install a valve... a simple plumbing fixture from the hardware store, inline with the coolant hose, and have a bypass route with a Y.

Something like this, just for a visual aid.

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Old 02-27-2008, 05:30 AM   #6
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I have done the bypass on my car. Been that way for 2yrs. Here in MN it has got down to -30F this last winter. No starting or negative performance issues. In the summer it gets up to 90F. Again no starting or negative performance issues.

What am I saying?

I think you should be fine. Just do it.
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Old 02-27-2008, 03:38 PM   #7
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So on the subject, a lot of us have bypassed it (myself included, and i'll add with no ill effects)

Have you guys plugged it up (like taken off either hose and capped it)
or
Just ran a hose from point a to point b on the block? (I did this) I think this is the best way to do it, but im going to re-do it soon so that it doesnt pass by all the stuff onto pf the manifold. I've burnt myself so many times going for the throttle body and it gets in the way of rewiring/rehosing other stuff. (just a couple pointers of what not to do)
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Old 02-27-2008, 04:39 PM   #8
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On my 9k I capped the one hose that went behind the head and I had the turbo water line welded shut.

The 900 I haven't had a chance to do yet since its so damn cold out here.
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Old 02-27-2008, 06:50 PM   #9
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Won't make much difference to the charge temp.

What you are feeling is the increase in charge temp due to intercooler efficiency. The charge temp gets above 50c and the ecu cuts power. Fit a better intercooler and you will see many times the gains.
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Old 02-27-2008, 07:50 PM   #10
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And what about wrapping the plastic pipe that runs to the throttle body with heat wrap?....or is it more likely to trap the heat inside than keep it out?...surely all these small changes do make a slight difference, especially in summer when its hot?
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Old 02-28-2008, 03:26 AM   #11
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I think wrapping a plastic pipe would be kind of a waste since its not all that great of a heat conductor anyways.
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