bbk 90mm throttle body... needs guidance!

torq · Dec 12, 2012

installed a bbk 90mm throttle body and MIL comes on for IAC higher than expected. had at a dodge dealer to get the throttle relearned and was told PCM controls IAC. used the trinity to adjust idle -300rpm so idles at 510-520 and light still comes on. want JBA headers and hemifever tune but bad time of year to spend a lot on toys lol.

Hemi450hp · Dec 12, 2012

This is a common problem with the BBK TB's. That is why we came out with the 87mm TB. Our port design will flow all the air you need withouit throwing any codes. We have over 100 TB's out right now in both 85mm and 87mm, and have not had a single customer report any CEL's. A 90mm TB is too big for your mods also. Unless you plan to go with boost or nitrous, that big of a TB is actually going to hurt performance.

torq · Dec 12, 2012

thanks! i was reading all the guys saying that they bought the 85 and then bought the 87 so i was planning ahead and bought the 90 so id only have to get the one and later on have what i need but i guess my eagerness bit me in the a**. looks like ill have to try selling a slightly used 90mm on ebay lol

Hemi450hp · Dec 12, 2012

The size of the TB is only part of the problem. The BBK's have a straight bore, so it is 90mm from front to back. What you want is a TB with a tapered bore from front to back. Anything above the 87mm is just really big for these motors.

torq · Dec 12, 2012

from now on i come straight to you!!!!!!!!!!!

WhiteExpress · Dec 12, 2012

Very often a wise choice. There is a LOT of knowledge in this forum.

torq · Dec 12, 2012

damn rookies :idiot:

09SMOKINHEMI · Dec 12, 2012

torq said:
from now on i come straight to you!!!!!!!!!!!

this is your best bet.... this guy knows his stuff

torq · Dec 12, 2012

alright if i go with the JBA shorties and hemifever and whats already done would the 85 or 87 be what i want?

09SMOKINHEMI · Dec 12, 2012

i would say 87.... since you have the tune, shorties and CAI

2K10HemiRam · Dec 12, 2012

Getting an 85mm TB from moe's was one of the good choices I made but with as far as I'm going with my truck, I'm kind of wishing I had gone with the 87mm, lol.

Graygoose · Dec 12, 2012

Eric, you see good improvements just swapping TB?

Hemi450hp · Dec 12, 2012

torq said:
alright if i go with the JBA shorties and hemifever and whats already done would the 85 or 87 be what i want?

With the headers and tune, I would go with the 87mm. We have alot of customers running this exact combo with great results.

torq · Dec 12, 2012

off subject tho but hemifever says with my 3.55 gear i wont notice a difference with the tune. and that is mentioned in another thread

Hemi450hp · Dec 12, 2012

Said that you wont notice a difference from the TB or from the tune with 3.55's?

Casper · Dec 12, 2012

Hemi450hp said:
With the headers and tune, I would go with the 87mm. We have alot of customers running this exact combo with great results.

So the most performance enhancement I'm likely to do beyond a TB is a CAI. To me that sounds like the 85mm TB is where I should be.

I really doubt I'll take the plunge on a custom tune. What are your thoughts?

Hemi450hp · Dec 12, 2012

You are correct. You need at least a tune and headers to take full advantage of the 87mm. With your planned mods, the 85mm is the way to go.

Casper · Dec 12, 2012

Hemi450hp said:
You are correct. You need at least a tune and headers to take full advantage of the 87mm. With your planned mods, the 85mm is the way to go.

Which would you recommend first, the CAI or TB. I already have a drop-in filter.

Hemi450hp · Dec 12, 2012

You will feel better throttle response with the 85mm tb than with the intake, but the intake is going to help more at higher rpms. Overall gains are even better when you combine the 2 together.

torq · Dec 12, 2012

tune...i'll look for the thread that had that in it also

bbk 90mm throttle body... needs guidance!

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