throttle body

SRTengineers
SRT Engineering Team Join Date: Jun 2008
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Originally Posted by EDDIE T
which throttle body size would you recomend 85mm or 90mm on stock engine 6.1 with minimal mods. thank you in advance


Honestly, I'd save your money....but if you really want to, a 90mm is worth about 5hp.


seems so not worth it, eh? $200.00 + per 1 HP

max horspower from one single mod when you look at it on paper, yea its not impressive.

change out your tb and then tell me its not impressive....

theres more to mods than max dyno horspower gains. also your mods work together as a package to get you where you need to be. its only one piece of a puzzle. the goal is eliminating restrictions in the intake and exhaust to get more air in and more air out.

one of the stroker motors on chargerfourmz had a rediculous 25 horse increase from the 90mm tb alone. it was the last restriction in his system and gave him the air flow he needed without that bottle neck.

i did the 87mm one from matt and honestly it was worth every penny i spent on it. even if my motor only has a couple bolt on mods to support it. if i do future mods it will help them get the air they need too.

thats not mentioning the part throttle power increase which is where i noticed the most gain in the "butt" dyno.

I've seen dyno graphs showing better than 5hp through out the band on a 85mm throttle body. I'll post them up later and you can judge for yourself.

I really think the 87 is the way to go on a stock or modified 6.1L, specially if you're going to be tuned to squeeze the absolute most out of it.

I'm surprised the SRT Engineers even commented on a non-SRT part. They typically blow those kind of questions off because the best they can do is speculate.

Right on Jon. I couldn't agree more. As someone once told me, "every little bit helps". I really noticed a difference with the 87mm. I'm actually kinda surprised the SRT engineers said to go 90mm. I've heard that 90mm is only really recommended if you have other upgrades to go along with it that can take advantage of it.

Matt, you gotta let me know when you get a truck TB avail.

Dont know much about the lighter car application but the trucks all report a big improvement in throttle responce.

when i put me 85mm tb on I felt the difference the first time I drove it! Well worth it imo!

Don't you have to re-tune on the dyno again after tb change out? It would seem to me the a/f would change. Maybe risk the motor w/o tune.

Illinois Chaos wrote:

Don't you have to re-tune on the dyno again after tb change out? It would seem to me the a/f would change. Maybe risk the motor w/o tune.

no. the computer will correct for the extra air after you drive a little bit. a custom tune will help but its not necessary.

I'm just running the diablo 93 octane tune with added fuel across the board. it only adds fuel at WOT as the rest of the tables are non adjustable on quick adjust with the handheld and the computer can handle that just fine anyways. i have about 8% mid and high, and 5% down low added to get rid of any light knock and get more power from the airflow the intake/exhaust/TB added.

the tb won't make you lean enough to cause problems but light knock can make the motor cut power a bit and adding fuel gets you that power back if you can get rid of the knock that way. pulling a degree of timing or two can help too if you have excessive knock. our motors always show knock near the shifts so ignore that if you datalog. its "false knock"