Hi All, I have been extremely lucky to be the first customer to have an Arrington 6.1 Hemi 90mm Throttle Body installed on my 2008 Jeep GC SRT8. I thought I’d take some time to provide my initial impressions. Please keep in mind that these comments are just my opinion and I am in no way affiliated with any vendors mentioned. Background All work was performed at Bwoody Performance. Bwoody is a authorized Arrington reseller and they stand behind everything they sell and install. They also have extremely competitive pricing and outstanding customer service and support. Installation Pics can be found at: http://www.srtconnection.com/forums/showthread.php?t=5495 Test Vehicle 2008 Jeep Grand Cherokee SRT8 Approximate miles at time of install: 2,400 Modifications at time of install: • Stainless Works 1.875” Jet Hot coated full length headers • Stainless Works midpipes w/high flow cats • B&G Custom Tune via Predator • Bwoody Performance 4” CAI • Fully ported, polished and coated Hemi 6.1 intake manifold • Bwoody sway bar links • Bwoody CNC Poly Motor Mounts • 180 degree Valuecraft Tstat • Borla Type “S” Cat-back Exhaust • NGK Copper Plugs • Thermalnator intake spacers • AMW Catch Can • Motul 8100 X-cess 5w-40 oil Miles Since TB Installed: 175 Observed MPG (highway): 14.9 Best track time PRIOR to TB/Intake install: 12.66 @ 107.10 (Cecil County Dragway) Expected ¼ mile gains w/TB+Intake: -.5 secs/+3 mph trap speed TB Summary If you are like me, I really didn’t know anything about Arrington Engines prior to purchasing their throttle body. Afterwards, I did some quick research and found out that these guys build NASCAR engines (specializing in Hemi’s) and design custom racing parts. After reading the long history that Joey Arrington has in NASCAR and his personal commitment to customer satisfaction and quality, all made perfect sense once you look at the throttle body itself. This TB is made from solid billet aluminum and clearly you get what you pay for. The build quality of this part is NASCAR grade. How do I know? I worked a season on a ARCA (entry level series of NASCAR), team and witnessed first hand, the racing parts used on these and cup cars. Nothing is spared and each one is hand crafted, made in the USA. My only pet peeve, is that you get a new set of TB bolts, but they are stock steel and in my opinion, should be of stainless steel grade. Minor point. Installation This gets about as easy as you can get. Disconnect the battery, disconnect the TB connector, remove your CAI, unbolt the four TB bolts. Reverse order to install, reusing your original intake TB gasket. Everything lines up perfectly. The only minor recommendation that Arrington suggests (which is optional), is to bevel out the intake edge to help smooth the incoming charged air. Note however, that due to the increased size of this new TB, the intake and TB will not mate perfectly. There is a slight difference, the intake opening being slightly smaller. By smoothing out the inner edge, you help minimize air turbulence and Arrington indicates a pickup of about five (5) additional HP. Also, there were no clearance issues with Bwoody’s new 4” CAI. Again, everything lined up and installed correctly without any modifications. Start-up/Tuning After installation, we started it up expecting it to run poorly. Keep in mind that I already had Dave’s B&G tune installed. However, with the new additional flow, we were unsure. The Jeep started right up and idled perfectly. Initial throttle response was clearly stronger. The first thing I noticed immediately – is that this TB responds (reaction time from pedal input), is considerably faster. We can debate all day long, but my experiences with drive-by-wire TB’s, they always have a response delay. This TB’s response is as close to a mechanical linkage as I ever have felt (including, Vette’s, Camaro’s and 04-06 GTO’s). Bwoody hooked up a wide band and we took the Jeep out for a road test. After several full throttle passes, my AFR was right on and in the 11.8-12.1 range. After talking with Dave concerning my tune, results and modifications, we concluded that no new updates to the existing tune was needed. Driving Impressions and Overall Value Bwoody’s new 4” CAI was installed (I upgraded from their prior 3.5” CAI unit), at the same time we did the Arrington Throttle Body. Their new CAI is a no brainer for this application and setup. Aside from the increased size and smoother runner, the IAT sensor has been relocated much closer to the filter for a more accurate (and cooler) readings. The results? Again, the throttle response was outstanding! Faster and stronger, especially in the upper RPM ranges of 4,500-6,400. The truck continues to pull hard right up to redline. Idle quality is great, same as stock. I have not experienced any loading up and any prior “bog” between shifts, is completely gone. This included driving in stop and go traffic for over 30 minutes. The value of this is subjective and at $1K (plus the optional upgrade to Bwoody’s 4” CAI), is not a cheap decision. Honestly, I would not recommend this for a stock engine. However, if your going with ported intakes, headers, heads, cam even nitrous, this upgrade would be extremely beneficial to your overall performance goals. In my case, with my ported/polished intake, headers, exhaust, this Arrington throttle body, coupled with Bwoody’s new 4” CAI unit, brought everything together and made my investment (and smiles), worth so much more. I’d recommend this setup for both the daily driver (which is what my Jeep is), and the weekend warrior. I hope this helped in providing some initial feedback on this exciting new product. My sincere thanks go out to Mike and Gregg at Bwoody Performance, Dave Kasper at B&G and to Joey Arrington for stepping up, designing, building and bringing to market another quality product. Mark :thanks:
Hey great write up and glad you are happy. I was at Nitrous Outlet yesterday talking to Dave about how this will work with his Hemi Plate system so heads up on a possibly new design on the nitrous plate for the new 90mm TB.
Thanks.....cool. Dave's a good guy. He personally helped me setup my entire NOS system back on my GTO including his plate and his custom GTO ashtray toggle switch panel. Very stealth.
Nice write up, unfortunately every Arrington vendor got just ONE of these 90mm throttle bodies. We are still waiting. We have one sitting on the desk and will do a dyno before and after on my 426 Jeep, hopefully next week. Congrats and good luck with the results! ....and of course your working with good guys when it comes to Mike and Greg!
Thanks for the write-up. Do you happen to have before and after dyno numbers? If not, what kind of increase would you expect? Also, anyone know if bwoody or anyone else makes a CAI to match up with the TB for Chargers?
No extra tuning from my B&G custom tune. I really can't tell you what Dave did in the tune, but from the point we added the ported intake to adding the new 90mm TB, no updates were needed. I would suspect, however, that most folks will require some type of updated tune. That seems reasonable. Highway speed and response is GREAT! Crisp and quick. Sorry, no dyno numbers yet. They are coming as time permits. Thanks.
So you really think doing this if your close to stock is pointless, heck just getting a quicker throttle response is worth it to me.
Personally, I could not justify $1K+ on a stock motor with no other plans. Just seems to me there are better options to go with if that's all you wanted to do. Again, just my opinion. Heck, $1K buys a lot of beer and a lot of friends to help you drink it!! :beer:
I would say it all depends on how accurate your tune was to begin with. If you nailed your AF right in the 12.5 area then you are most likely going to be running too lean if you throw on the ported intake and 90mm. If you got a tune that was just safe an wasn't dialed in exact with an AF gauge, then you are most likely a little on the rich side, probably in the 11's, so adding these mods will probably put you closer to the "sweet spot"
HotScott7, The B&G stage 2 Base CMR tune will allow for some added engine components and still be in safe A/F Range. With the B&G CMR Stage 2 tune and the Predator's adjustable +/- fuel adjustability installing the 90MM TB will not require a new CMR tune. But just as FDNY-L107 did you should check for a proper A/F reading and adjust with the Predator if needed. And if by chance there wasn't enough adjustability within the Predators range, we at B&G could adjust the tune to meet required optimization. And that goes for any major engine change A/F should always be rechecked and adjusted if needed...Hope this helps..
I think you need to do some changes/testing to the intake manifold to see how much is available from 90mm. 1) An adpater that actually smooths out the diff in the 90mm opening to the 84mm opening on the Intake. 2) Some maching on the intake to open up the port to 88mm which is what I believe is the max you can open up the stock intake hole. 3) An intake with a larger opening welded in to support up to a 100mm TB.
