2004 Paxton Viper Build

[Powerplant Motorsports]

Hey guys want to share a 2004 RT10 Paxton supercharged build we did starting from the beginning. Dave a Forum member here by the name NJDAVE brought us his car to be dyno'ed and see what kind of power his fully built viper with a Paxton kit produced. Now mind you this was the stock kit Paxton sells installed on a fully built motor. With a comp cam and light head work. Stock exhaust manifolds with Corsa race cats and exhaust.
http://i.imgur.com/8MxbKUtl.jpg

Here is a picture of it waiting its turn for the dyno under a Lamborghini we are working on. By the time it was done it became a real deal sleeper. Once on the dyno just as we thought it was way lean but made some decent power for the stock injectors run by the split second controller and dual fuel pump setup.
http://i.imgur.com/d19fE3al.jpg
If you cant read the graph it made 605whp and 584wtq on our mustang dyno with an air fuel coming in at mid 15's dropping to a mid 13. at 6.8lbs of boost. Not good since it had been this way for a short while and Dave is not shy about driving it hard. After a look over and finding some obvious problems me and Dave decide to pull it apart and fix what needs to be and lose the split second controller and go with an SCT Tune.

http://i.imgur.com/KfYyzRhl.jpg
While taking it apart we find a badly frayed oil return line.

http://i.imgur.com/4XL324Nl.jpg

Along with an intercooler that has been rubbing on the cross brace for awhile and was about to go through the tank. And couldn't look at the the oily crud in there anymore!

http://i.imgur.com/qebWaNTl.jpg
Also a kinked oil return

http://i.imgur.com/n6zu3jVl.jpg

This got pulled out too as we planned on going with a much smaller pulley. Larger injectors. Twin in tank fuel pump. Along with a boost activated water meth system. So the plan was fix the problems we have now and order up what we needed to make the serious power Dave wanted for the car all along

http://i.imgur.com/DTn6aOSl.jpg

A picture before we took it all apart. Dave can chime in with any thoughts or comments on the build. As he was very excited seeing how poorly it looked on the graph and what we found wrong with it and knowing how much better it would be in the end!

[ViperTony]

Gjon, check your VM, Emails and PM. I've been trying to reach you. - T

[NJDAVE]

Gjon,
Awesome that you started this & are telling the story. By the way the 605 WHP was @ 5000 RPM as we had to stop the pull due to a lean condition. Also the boost side hose of the Paxton blower was loose & the hose clamp was hanging off. Keep posting the story as it unfolded.

[Powerplant Motorsports]

OH yes Dave. Its all coming back to me now. I think I blocked some of the things out! lol Way to nice of a car you have for it to have been in that condition.

[herold49]

Are you selling the regulator and fuel pumps?

[Powerplant Motorsports]

The owner NJDAVE has the set up and im sure he would sell it. He is watching the thread and will comment on your question. If not inbox him.

[NJDAVE]

The pumps are in the factory hanger & I am not selling that. Sorry.

[viper04]

Please keep us posted.

[Powerplant Motorsports]

Here are a couple of pictures of the intercooler after tig welding and sanding it sooth then polishing it nice the way it should be.

http://i.imgur.com/B0wQ02Gl.jpg

http://i.imgur.com/htUGcpVl.jpg

We also polished the blower while it was out. We cant help ourselves with this kind of stuff. Also new oil return line obviously

http://i.imgur.com/f8159wDl.jpg


http://i.imgur.com/et5LD7xl.jpg

Talking with Dave we decided to get a twin in tank fuel pump setup with a boost activated secondary pump action. 69lb injectors on the stock rails and non return fuel system. A 2 bar map sensor. Boost activated water meth system. And a pulley from Paxton which is not made for the viper supercharger setup and would need to be modified to fit. With crank pulley size to blower pulley size and target rpm we figured it would make roughly 15lbs of boost. The power I figured we would be making I didn't think the stock fuel lines and rails would be up to the task. Dave still wanted to go with it. Sorry Dave. So onward with the build and hope it has enough fueling.

http://i.imgur.com/cunDmIvl.jpg

http://i.imgur.com/eJLPvWkl.jpg

Here are a few pictures of the pulley size difference and how much we would be needing to remove to fit and not rub. Pretty big difference!

http://i.imgur.com/19G4BPyl.jpg

http://i.imgur.com/XlGNWGql.jpg

http://i.imgur.com/rtUHG6Ml.jpg

To keeps things neat and tidy and for ease of testing/diagnostics we built a bracket to hold both of the boost activated switches

. http://i.imgur.com/zUU9Pn0l.jpg

[viper04]

Nice, keep the updates coming.

[James430]

Just a thought,just had my paxton installed on a built motor and 2 different places around here in houston including SeriousHp the place that did the motor work and installed the Paxton recommended to stay away from the dual paxton fuel pumps and go with the single Walpro 400.....so far so good...No matter what you do he is going to be Happy,Happy with end result..I'm still smiling!!! See link

http://www.enginebasics.com/Product%20Tools/Walbro%20400lph.html

[Powerplant Motorsports]

Thanks James430. We didn't even bother trying to use the Paxton twin pump setup. Dave the owner bought the twin in tank fuel system from Roe racing which I believe were twin 255lph with the second coming online at a boost level we determined. Our biggest concern was more so the stock fuel feed lines and non return system/regulator for the power we were looking to make more so than the fuel pumps themselves. Nice car btw. You made 667whp without nos? How many lbs of boost were you making. Thanks

[James430]

If you check out the YouTube video on my signature I think it was 666.64 rwhp without NOS and that was with just 5 lbs boost...they told me there was more hp in it but with stock bottom end I better stop there.....low boost means it also runs cooler....down here in 95 deg weather it stays about 190 and drops when needed with the 170 deg thermostat.the baseline run was 521 rwhp with engine mods.the extra 150 rwhp from Paxton is about average

[NJDAVE]

Gjon,
the first go around with the ROE fuel system were 2 Walbro pumps in the stock hanger. One 255 & one 450 coming on in boost & that was still not enough fuel.

[pumpgas]

Any update on this build?

[Powerplant Motorsports]

Sorry for the lack of updates guys. Shop is super busy and not much time. I will get more pics and the next steps up soon but here is the dyno sheet as we attempted to tune but it ran out of fuel. We back off as afr's start heading north of 12 real quick. At this point it had maxed out the injector duty cycle and was time for a new bigger fuel system

http://i.imgur.com/pS0dFdjl.jpg

[Powerplant Motorsports]

Once we got Dave's car on the dyno its was obvious it maxed out the the fuel systems capabilites and had to look in another direction. We let off as the afr's started climbing fast north of 12 with over 1000rpm left to go.

http://i.imgur.com/FOowcwOl.jpg

After some discussion with fuel system manufactures we decided to go with the full return fuel system from RSI. Billet twin pump hangar. Fuel lab regulator. 90lb fuel injectors and billet polished fuel rails. Once we looked at the kit out we noticed it was missing the return line to the fuel tank and no pressure gauge for the rail. Also no mount or specific location to mount the fuel pressure regulator. Otherwise very nice kit.
http://i.imgur.com/pKeVyKyl.jpg


http://i.imgur.com/ofO5fL7l.jpg

we decided to mount the regulator along with the water methanol control box/activation switch together.

[PaulP]

Very nice, how was the wait time from rsi?

[Powerplant Motorsports]

PaulP wait time was over 2 1/2 months due to supplier issues. Then we had the missing parts. Dave the owner of the car was not happy. And who could blame him.

[PaulP]

Any updates ?

[PaulP]

What kind of boosted activating switches are those ? anyone know, looks little nicer than a hobs switch

[Powerplant Motorsports]

Hi Paul. Sorry for no updates. I will get some up in the next couple of days. But yes the Roe W/M kit does use a hobbs switch housed in a box Sean has made. We set the W/M to come on in Dave's car at 5lbs.