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I currently have 3 ongoing Vipers.  2001 Roe supercharged GTS.  ported heads and a 720whp build using dual 70mm Accufab racing TBs.  2. 1999 TT Viper GTS with 1500whp stock Gen 2 modified intake and dual 70mm Accufab TBs.  3.  1998 TT 1000whp built engine using stock Gen 2 intake and dual 70mm Accufab racing TBs.  According to various ratings my airflow rating should be about 1400cfm.  Thinking of upgrading the 1000whp TT with sheet metal intake and Oval blade Accufab TB (1696dfm).  Would like the 1800 cfm oval TB for the big power TT Viper though.

I copied this info from Accufab website to help people (and me) choose Throttle bodies for their builds; 

CFM Air Flow

What is CFM? The air flowing through a product is measured in Cubic Feet per Minute, CFM.  It's important to flow test a performance throttle body and find the CFM rating.  A 75mm Brand A throttle body, may not equal the performance of a 75mm Accufab throttle body.

This airflow analysis is important because, basically, an engine is an air pump.  Based on the size of the engine and how fast it will be spinning, it will pump out a certain amount of air. Of course, there are many variables to CFM requirements, such as cylinder head flow capabilities, intake and exhaust manifold flow capabilities, etc... but the basic engine block will pump a certain amount of air over a specified period of time, measured in CFM.  An Accufab throttle body is designed to outflow the stock throttle body, hence, providing more air to the engine for it to utilize accordingly.


All CFM ratings shown @ 28”:
Buick GN, 1986-1987
65mm – 649 cfm
70mm – 711 cfm
Dodge Viper
RT-10, Gen 1, 1992-1996 – 65mm – 611 cfm each
GTS Gen 2, 1996-2002 – 70mm - 697 cfm each
Chevy LS-1, 1998-1999 and up (with mechanical linkage)
Stock – 798cfm
75mm – 920cfm
90mm – 1369cfm
Ford Mustang 5.0L, 1986-1993
Stock – 495cfm
65mm – 664cfm
70mm – 787cfm
70mm (Race) – 896cfm
75mm – 924cfm
75mm (Race) – 1045cfm
80mm – 1142cfm
85mm – 1322cfm
90mm – 1369cfm
105mm – 1550cfm

Ford Mustang 4.6L, 1996-2004
70mm – 628cfm
75mm – 632cfm
Stock throttle body and plenum – 498cfm
70mm and Accufab plenum – 680cfm
75mm and Accufab plenum – 686cfm
Ford Mustang 5.0L, 2011-2012
84.5mm – 1183cfm
Ford Mustang Cobra, 1996-1998
and Mustang Bullitt, 2001
Stock – 1089cfm
Elliptical Mono Blade – 1284cfm
Oval Mono Blade – 1696cfm
Ford Mustang Cobra, 1999-2001
and Mustang Mach 1, 2003-2004
Dual 60mm – 1147cfm
Ford Mustang Cobra, 2003-2004
and Ford Lightning Pick-up, 1999-2004
Oval Mono Blade – 1696cfm
Ford GT, 2005-2006
Stock – 1590cfm
Dual 75mm – 1807cfm
Oval Mono Blade – 2090cfm
Accufab 4-Barrel Throttle Body
4150 style - 1215cfm
4500 style – 2128cfm
8500 style – 3600cfm
Mountain Motor “split Dominator style”
Dual 2.75-inches – 1849cfm (per unit)
RSI / RSI Black Friday / Cyber Monday Sale 2017 |
« Last post by Will at RSI on November 25, 2017, 09:57:07 AM »


Happy Holidays from the RSI team!

What a great year this has been! We are excited to kick off the holiday season with another giant Black Friday / Cyber Monday sale!

With the success of last year's sale , we would like to continue to make sure everyone is aware of a few policies and procedures. When you make your purchases online, although your card will be authorized, you will not be charged immediately. As orders are processed, we will contact you directly about any product that will not ship within 7 days. At that time you can choose to wait or we will void the authorization. Please expect products that require custom finish, assembly, or changes, will take longer than a week. We will be in contact with you to confirm the ETA and finalize your order.

As always, we offer a price match guarantee on any product in our sale or any COMPETITORS SALE. Even if you order early from us and see their price later, you can still contact us for a refund of the difference.

RSI Black Friday / Cyber Monday Sale items are available only for orders received from 11:30AM, November 24, 2017 until to 12:00PM, November 28, 2017 Central Time.
If you have a question and we are not available via phone or chat,
please send an email to
Only orders with pending questions can be processed after conclusion of the sale.
Free Shipping does not apply to international orders.
We do have special international shipping rates for this sale.

We will be offering ALL products at SUPER LOW Prices!
If you are looking for an item that is not included in our sale, please simply ask. We are more than happy to create a special deal just for you.

Although we do stock a tremendous amount of product, some items may not be in stock in our Texas warehouse or they may be sold out when your order is placed. In the event that an item is not in stock, we will drop ship the item from the manufacturer as quickly as possible. In the event there will be an extended delay on an item, again we will contact you to discuss options!

Make sure to check back every day as we will be adding new products during the sale!

Also call us about Year End installation specials including Gen 5 Twin Turbo Systems!

Happy Holidays from all of us at RSI!

Best I could get with my TT GTS set at about 950whp and smoking R888s through 3rd was 10.4@ 149mph. This year the machine shop I paid to cut me an input shaft to bolt a Lenco and Gear Vendor to my dual disc clutch Never got it done and I asked (and received) my money back.  So this becomes the second winter project.

Joel Fortin got his 98 TT GTS running and with problems he ran 8.7@168mph. 
Acceleration Tests, Drags, Half and Mile tests / Re: World's Fastest Viper 6.7@211mph
« Last post by RTTTTed on October 29, 2017, 09:56:19 PM »
Sal Patel has a Black 99 GTS TT that ran 6.9ET at the drag strip and now holds the world's fastest RWD Halfmile record at 237mph!!!

Sal's is also licensed, has interior and gets street driven. 
LOL, "the Viper Store" sells the spark plug non-foulers for 'only' $49 plus ($20?) shipping    :P
Viper Parts, numbers, bulbs, specs and info / Viper Rear Wheel Hub assembly crossover
« Last post by RTTTTed on October 21, 2017, 10:30:48 AM »
Dealership cost on rear wheel hub assy was $403US last time I checked so I purchased one from ebay.  My broached 33 spine Mark Williams hub had been compromised when I tach welded the long wheel studs to the hub.  DON'T do it.  The material doesn't mig weld and the heat dissipation is so intense that it melted the plastic spacer ... 

This Timken listing shows that ALL Vipers!  This wheel hub also fits Dakota front wheels ...  (4x4)

Thanks Leif Larsson for the link
RT/10 & GTS Viper Discussions / Re: Need advice on wheels/slicks for a Gen2 Twin Turbo
« Last post by RTTTTed on October 12, 2017, 03:22:37 PM »
I have some 17" CCW Classics I could sell you.  Wrinkle slicks fit up to 17" wheels.  Lots of size options if you look at Summit, Mickey Thompson, etc

CCWs also make a 16" wheel for the Gen 1/2 Vipers that fit 14.5 x 16 x 28" wrinkles (mine are Hoosiers).  They also make a set of 12 x 16 x 26" wrinkle slicks for these wheels, but not much else for 16"

I have 15" wheels and tires on my '99 TT GTS.  I also have a GForce race trans, steel carrier caps, Mcleod clutch, chrome moly dsahaft, $11,000 MW halfshafts, 33 spline MW spool and Billet yokes. 

15" requires a smaller 12.2 rear brake pieces from Wilwood brakes.  I do norecommend this as the kit I got was incomplete and cost me $350 extra for parts stated as included but not in box and changing from junk rotors to premium hi carbon rotors and Ceramic (high speed) pads.  I re designed the "kit" I bought and all the parts are listed in the How To section on this website

What whp are you running? what transmission?  gear set? 
RT/10 & GTS Viper Discussions / Need advice on wheels/slicks for a Gen2 Twin Turbo
« Last post by LenZ on September 17, 2017, 06:05:05 PM »
I have a Gen 2 Twin Turbo (currently 600whp) and I need recommendations for smaller rear wheels and recommended tire sizes for slicks. I made my first trip to the track this weekend and as expected traction was my worst enemy. That and my horrible timing with a clutch leaving the light. I know I've seen pictures of what appeared to be 15 or 16inch wheels on Gen 2's running slicks. Any thoughts or opinions would be great! Thanks!!
RT/10 & GTS Viper Discussions / Re: Tom's 40mm brakes are back!
« Last post by 40mm on July 17, 2017, 07:47:28 AM »
Thanks RTTTTed.
They are a great addition to any non-ABS Viper.
Tom did a lot of work... I'm just riding his coattails on this ride.

Well folks.... they're all gone for 2017!
Apparently there was a bit of a pent up demand for them.

No worries though, they will be back for 2018!

Once I get all the cores back I'll do another run of at least 10 sets this winter.

If anyone wants to get their name onto a waiting list, just email me at ricks40mm(at) or text me at the number above.

Thanks to everyone who purchased a set!
Cheers to all.
How-to section / Roe Racing 2.4L blower oil dip stick build
« Last post by RTTTTed on July 12, 2017, 10:52:54 PM »
Many7 peopel have lost their original Roe Racing blower's dipstick.  I took a pic and am posting it so measurements are recorded so you can use a tape or make a stick to measure the amount of oil in the front bearing gear case.

From top of blower case to Full oil level is 3.1" and "Add level is 3.3" from top of case.  The plug to check is at the top front of the blower case on the right side.
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