c32 dan

what do IAT mean??and also is it easy to fit a johnson pump??any instructions..is it ok to use the standard spark plugs when upgrading to the code3 pulley and intake??

cdd

IAT stands for Intake Air Temperature. Can't answer the question about the Johnson Pump...but do a search and their may be some DIY's on it--it's a pretty common mod.

Newzchspy

Its a replacement of the stock pump; There's others BUT Johnson seems to be the "go to" pump.

bud4ya

Plugs need or should be re gapped with pulley

Newzchspy

To what Bud??? I have never touched mine and have the stock plugs in there??? What gap and plugs you running on that "4 Sale car??"

bud4ya

Why would I re gap plugs that are on a stock car?

This is just one post from Brandon suggesting plugs be re gapped when changing out to any pulley that increases boost. Did you read all the posts on the subject? because I am pretty sure it was mentioned more than once. Maybe things changed since then I do not know. I did some homework before I throw out that comment on the plugs. If this has changed or you have other info that suggests you should not re gap I would be interested in seeing it .

If I am incorrect on this I apologize for any false info.

That first graph was actually the best looking run before we regapped the plugs down to 035. Some of the other runs we did before that, demonstrated just how important regapping the plugs is. So whether you are running a crank pulley, or the new sc pulley, regapping plugs is recommended. I was planning on doing a separate post with before and after dynos in regards to regapping the plugs. To be honest, I regapped in stages. First from 039 to 037, then from 037 to 035. After 035, everything always looked good. That first graph was an 037 run. The last was an 035 run. Every dyno at the stock gap, running the sc pulley, looked far worse. Power drop off was awful. Regapping the plugs will completely reshape the upper part of the power curve.
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Owner, Code3 Performance
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c32 dan

so any instructions on how to install a johnson pump??

bud4ya

I am not sure if this helps but here you go

https://mbworld.org/forums/showthrea...l+johnson+pump

bud4ya

Did you have a chance to check on the spark plug gap with S/C pulley?

MRAMG1

I have a pulley on mine, track it hard, and left the STOCK gap alone. NO spark rattle at all. The theory is that when you increase boost, you make the gap smaller, as it is harder for the ignition system to ignite a denser charge. Whenever I change my plugs, I will regap them about .005' tighter.

See yeah

bud4ya

TY I thought that was the case I was surprised by the response when I suggested the gapping of the plugs on a pullied car. I was like I know I read that somewhere. Sounds like doing this with your crank or S/C pulley set up will help out with power too.

Thanks