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914World.com _ 914World Garage _ Throttle Body Bored Out

Posted by: FB914 Mar 1 2005, 09:30 PM

I have a 74 with a recently rebuilt 2.0 with Euro Pistons, Stock D-Jet, MSD, sport exhaust and hi flow air filter, I'm wondering if getting the throttle body bored out is worth it. Any thoughts? Is there a downside - risk of screwing up the motor? Thanks

Frank

Posted by: Mark Henry Mar 1 2005, 09:37 PM

stock D-jet??

Save your money..not worth it.

Posted by: Porsche Rescue Mar 1 2005, 09:41 PM

I'm signing on only because I have a 2.0 D-jet track car with Euro p&c's and lightened flywheel. PO told me it had an enlarged throttle body (no idea how to confirm that). I want to hear what you all have to say.
I will say that it feels stronger than a stock 2.0 with Webers.

Posted by: Mark Henry Mar 1 2005, 09:51 PM

Stock is 45mm, bored out is most likely 50mm

I have a 2.0 with a scat C-25 carb cam and SDS EFI....a bored out TB wouldn't help it.... a header would.

Posted by: Bleyseng Mar 1 2005, 10:17 PM

A bored out TB with careful tuning will gain about 1hp. Probably the 1hp is from the careful tuning. This test was done on a dyno.
Save your money and spend it on dyno tuning your djet.

Geoff

Posted by: SirAndy Mar 1 2005, 11:32 PM

QUOTE (Bleyseng @ Mar 1 2005, 08:17 PM)
A bored out TB with careful tuning will gain about 1hp. Probably the 1hp is from the careful tuning. This test was done on a dyno.

the weak side on our cars is the horrible exhaust flow, not the intake ...
save your money for a set of nice headers ...

Andy

Posted by: DNHunt Mar 2 2005, 09:34 AM

I ran one on my 2.0 L with megasquirt for about a year. Even with being able to tune the FI I couldn't see any difference. Look at the exhaust.

Dave

Posted by: SteveSr Mar 2 2005, 09:48 AM

if you are not doing the WHOLE motor,bigger cam, bored cylinders IMPROVED intake runners and exhaust there is no sense trying to get more air in thru a bigger throttle body. ....just my $.02......

SteveSr

Posted by: Bleyseng Mar 2 2005, 10:17 AM

Whats a Sport Exhaust?

Posted by: Travis Neff Mar 2 2005, 10:33 AM

Bleyseng, it's all in the stickers, all in the stickers...

Posted by: Mark Henry Mar 2 2005, 10:42 AM

QUOTE (Travis Neff @ Mar 2 2005, 12:33 PM)
Bleyseng, it's all in the stickers, all in the stickers...

Yep...I'll have stickers for you Canadian guys soon...good for 10hp

Posted by: FB914 Mar 3 2005, 06:35 AM

Thanks for all the feedback, I think you've answered my question. Sport exhaust is a Monza and it doesn't add any sport except an extra tailpipe. Thanks again

Posted by: Bleyseng Mar 3 2005, 08:30 AM

switch to a Bursch and gain 3hp over the Monza.

Posted by: BahnBrenner914 Mar 3 2005, 11:42 AM

yeah i was talking to a guy who built racing 914s and such and asked him how to get more power out of my 914. I said, "should i go with borred out TB or headers or..." and he laughed and said "you just need to drop in a V8 if you want power" just realize you wont get too much power from your type IV, put your money into suspension and brakes to make it haul around corners.