Author Topic: Throttle body coolant bypass possibility (Read 6203 times)

AL GReeNeRy · « **on:** November 14, 2006, 06:20:45 AM »

I know on chevy 350s theres a small yet significant little mod that simply connects the inlet and outlet hose on the throttle body for the coolant to pass through, called the throttle body bypass. They claim it makes about 10 give or take a few HP (or should i say recovers lost HP from the water pump). I was looking at the schematics in the bentley and we have a similar throttle body coolant passage and i was wondering if it was possible to do something like this on our m42s. I am NOT looking to make easy HP, simply trying to take off as much load on the engine as possible.

Vladi · « **Reply #1 on:** November 14, 2006, 08:03:17 AM »

That mod isn't going to give you any relevant HP because it just makes the air going into your intake colder and it doesn't stress your coolant pump in any way because the pump doesn't make more effort to push the coolant thru the plate on your TB.

D. Clay · « **Reply #2 on:** November 14, 2006, 03:33:54 PM »

Inlet air temperature affects horsepower!
http://www.aempower.com/ViewTopic.aspx?TopicID=10
Question: Where does an E30 take temperature and volume inputs and calculate the amount of fuel relative to the heated plate?

ak96ss · « **Reply #3 on:** November 14, 2006, 04:30:38 PM »

Quote from: AL GReeNeRy;13729

I know on chevy 350s theres a small yet significant little mod that simply connects the inlet and outlet hose on the throttle body for the coolant to pass through, called the throttle body bypass. They claim it makes about 10 give or take a few HP (or should i say recovers lost HP from the water pump). I was looking at the schematics in the bentley and we have a similar throttle body coolant passage and i was wondering if it was possible to do something like this on our m42s. I am NOT looking to make easy HP, simply trying to take off as much load on the engine as possible.

Actually, it's not that it recovers lost HP because the coolant pump has less work, it's that it doesn't add heat to the air charge as it enters the engine. Cold air is better for power, right, so why heat it as it enters?

That being said, I did it on my 1996 Impala SS and didn't notice any significant difference.

The idea behind having the warmer plate is to prevent the throttle body from icing - if you live in a warm enough area, it is not necessary.

Really, though, the amount it warms the air charge is negligible (consider just how long the air is actually in the throttle body on it's way through your engine), and for the work involved, I would say it is not worth the effort. If yours is leaking, then by all means, cap it off, but other than that...

e9nine · « **Reply #4 on:** November 14, 2006, 08:34:32 PM »

I'll try to take pics of my setup. I just eliminated the whole TB heater thing on my other car. I have my car running like this now as well as my older m42.

I run my last m20 like this in NJ which was much colder than GA and never had any issues with the throttle sticking. My cars have never had an issue passing emissions and I didn't notice any power increase.

It makes it much easier to route the intake stuff as all you do is connect the crank case hose to the lower TB "nipple" and the port coming out of the intake bellow is routed to the ICV.

asubimmer · « **Reply #5 on:** November 14, 2006, 09:54:38 PM »

Quote from: Vladi;13730

That mod isn't going to give you any relevant HP because it just makes the air going into your intake colder and it doesn't stress your coolant pump in any way because the pump doesn't make more effort to push the coolant thru the plate on your TB.

its actually to heat the TB, so that it won't freeze. Thats how you gaining power by bypassing it, temps drop and power rises. :rolleyes:

AL GReeNeRy · « **Reply #6 on:** November 15, 2006, 05:21:58 AM »

ok well theres goes that idea.. but as e9nine informed us, less plumbing is always a plus.. snap some photos!

Vladi · « **Reply #7 on:** November 15, 2006, 05:48:34 AM »

Quote from: asubimmer;13781

its actually to heat the TB, so that it won't freeze. Thats how you gaining power by bypassing it, temps drop and power rises. :rolleyes:

Yes but as the others confirmed it's not such a big improvement.

AL GReeNeRy · « **Reply #8 on:** November 15, 2006, 07:02:07 AM »

Quote from: asubimmer;13781

its actually to heat the TB, so that it won't freeze. Thats how you gaining power by bypassing it, temps drop and power rises. :rolleyes:

hmm well im sure i wont need that here in san francisco, so as soon as e9nine helps me out im doin it!

asubimmer · « **Reply #9 on:** November 15, 2006, 10:24:24 AM »

Quote from: Vladi;13812

Yes but as the others confirmed it's not such a big improvement.

I never said it gave you 500hp

I wouldn't do it unless you are already down there and just wanna mod...

Alpine003 · « **Reply #10 on:** November 15, 2006, 12:53:47 PM »

Waste of time on this motor. I've done it before on several motors only to go back to the original config.

We don't have Chevy's so little mods will do little to nothing. Not like adding a Borla exhaust to a Corvette and adding 30+ hp.

I cry everytime I thumb through a Mopar catalogue. Billet Cams for $250?

?

Vladi · « **Reply #11 on:** November 15, 2006, 06:37:09 PM »

My E36 engine doesn't have one, so one mod out from the list.

Gizmo318i · « **Reply #12 on:** November 16, 2006, 03:51:39 PM »

I blanked those lines off and made a 6mm thermoplastic gasket to space the manifold off the head to reduce intake manifold temps. The intake manifold is alot colder than the tappet cover, even after a few hard laps...

AL GReeNeRy · « **Reply #13 on:** November 16, 2006, 06:22:00 PM »

Quote from: Alpine003;13838

Waste of time on this motor. I've done it before on several motors only to go back to the original config.

We don't have Chevy's so little mods will do little to nothing. Not like adding a Borla exhaust to a Corvette and adding 30+ hp.

I cry everytime I thumb through a Mopar catalogue. Billet Cams for $250??

yup, them american cars are BEASTS.. every little mod makes a difference some how.. especially their cams.. theyre so cheap but they can easily add 100hp

dino245 · « **Reply #14 on:** November 16, 2006, 07:06:18 PM »

Hay Gizmo
did the 6mm plate off set the intake manifold higher? Did this change in mounting height adversly effect the instalation of the intake manifold. I have been thinking of doing someithing like this and was thinking the manifold would need a 10mm + spacer to be effective and this would lift the manifold into my strut bar. Would you take some pictures.

By the way I removed that stupid coolant hose also not for the extra Hp just remove the cluter.