buffyclk500

has any 1 done a tb grind on a na v8

i know lots of m113k people did it and were very happy
some say they got 20rwhp

if i get 10rwhp i will b happy

any info will help

Klinh

What's "tb"? Throttle body?

buffyclk500

ya

Kevwood

You're talking about boring it out to a larger diameter, right?

buffyclk500

https://mbworld.org/forums/w211-amg/...rind-talk.html

but in a na v8

Kevwood

A few of us with high reving LQ1's did something like this, but more extensive. We actually bored the TB out from (testing my memory here) 62 to 65mm, replace the butterfies and polished the hell out of it. The increased diameter flowed more air, leaned the a/f mixture out and made a few more HP. The posted link is pretty much just a 'clean up', no way that will gain you 20HP on your car, no way. On a E55? Maybe but I'm tending to doubt it unless I see a dyno chart. Blown engines have different characteristics than NA, no question, but 20HP?

The absolute proper way to go about it (and I believe you fit into this catagory seeing that you're chasing 12's) is to port & polish the heads, gasket match, valve grind, then do the same to the intake manifold & clean up the TB. Of course you'll need a custom tune afterwards as the car is going to need some additional fuel tossed at it to componsate for the increased airflow.

buffyclk500

well started it 2
did the center
it is on the car and is working good i will finish it 2maroow

Kevwood

Pics?

buffyclk500

i only did the top part but there is a diff be 4 i was getting at my best 38.1lb per min past the MAF now at half the speed i got 40.3lb per min
and all testing was done at 68-72 out side with a coolent temp at 180c
also same road and same time of day

the only bad thing is i need a tune now because the i dont know my AFR and i would like 2 b safe

betrezra

Thanks for posting this... I'm thinking this will be in my next round of mods.

Kevwood

Let us know what % diff in a/f ratios you find.