Mark's SRT re-do -- no traction at all :) page 5

I don’t know :frowning: But, I am still going with it. So far, my car went 12.0 @ 119, highest trap of 120.4, both of which were full interior (2750 lbs without me in it), 25.7" M&H Racemaster Street/Strip slicks, and 100 octane fuel and meth. I just couldn’t seem to break into the 11’s with that setup. I was very consistent, pulling 7.9 1/8th @ 95.5 over and over, and 1.9 60’ times, but thats as good as I could get. I tried a bunch of things, and just no more. I am spinning through second gear, so the slicks I had were just not working for my application.

So… I ordered up a set of these:

http://static.summitracing.com/global/images/prod/large/mtt-3012.jpg
http://store.summitracing.com/partdetail.asp?autofilter=1&part=MTT-3015&N=700+0&autoview=sku

They are a smaller tire, only being 24.5" tall, but they are wider, and an actual wrinkle wall full race slick. The M&H ones I had were for the street and strip, and I could just not get the traction that I need to go 11’s.

I am hoping to go maybe even as quick as 11.7 just by bolting these up and practicing. I should be able to pull 1.7’s, and then pick up another tenth or two just in my 330’ by not spinning through second. I may also pick up some MPH. I talked to PSI Chick who went 11.5 in her similar setup to mine, and she picked up 4 mph when she went from a 26" slick to a 24.5" slick. I am not expecting to pick up 4 mph, but even if I picked up 1, that would be an improvement.

Next, I had a NOS Sniper wet kit sitting in my basement for a while now, and I had no motivation to hook it up. My car makes 343/371 on pump gas, and then 400/400 on race gas, and that is fine for me… until I saw this:

http://i107.photobucket.com/albums/m283/maxfastest/Stuff177-1.jpg

This guy has a very close setup to mine. He made 365/410 on race gas, without the nitrous. So, he picked up 97 whp and 143 ft/lb on the 55 wet shot he did! That is amazing. I saw this, and then immediately went outside and started hooking up my kit :slight_smile:

http://farm4.static.flickr.com/3086/2571035589_7abac114a1_o.jpg
http://farm4.static.flickr.com/3182/2571035881_c4f87ef0e5_o.jpg
http://farm4.static.flickr.com/3058/2571036065_0509d9ffbb_o.jpg
http://farm4.static.flickr.com/3048/2571035417_95b3e1b047_o.jpg

It went pretty well. I have a mechanial WOT switch that I was trying to figure out where to hook up, but it still left me the problem in my head on if I should use a windows switch or not, and how I was going to control the nitrous, so I didn’t spray in 1st gear. I was looking all online, and found exactly what I needed:

http://www.dynotunenitrous.com/store/ProdImages/1_stage_rpm_LARGE.JPG
http://www.dynotunenitrous.com/store/scripts/prodView.asp?idproduct=288

It is a digital RPM windows switch that you set the start and stop points, an electronic WOT switch that gets signal from the TPS sensor, and it does a really neat gear dependent nitrous firing system. It works by sensing what gear you are in by how many times the RPM dropped and then started going back up again. This is perfect!

While I was here, I decided to order up an automatic bottle warmer and pressure switch too:

http://www.dynotunenitrous.com/store/ProdImages/Nitrous_oxide_bottle_warmer_big_bottles_small.jpg
http://www.dynotunenitrous.com/store/scripts/prodView.asp?idproduct=17

So, I should be good to go! I doubt I will make 500 wheel, but I should get relatively close to it. Everything else is built on the car, so it should have no problems handling it. The trans is the only weak point at that power level, but I have a spare.

My big decision is what I am going to do with my meth. At least for now, I am going to continue spraying meth when I am not spraying nitrous. It works so well for me in daily driving, as I don’t have to put in race gas all the time, and I get no knock and full timing advance. I won’t need it when I spray nitrous though, as that will do plenty of cooling, and I will just run 110+ octane race gas then, to handle the rest.

I should have no problems playing with the big boys this year :skunk:

–marke

Absolutely evil. Good luck, I want to see some slips! :tup:

good luck Mark!

what’s w/ those nasty looking (burned??) wires to the upper-right of the second under-hood photo? electrical fire? heat from a header? just dirty / sticky w/ old tape residue?

There goes ever having a shot at keeping up with you this season :tup:

Yeah, its just electrical tape wrapped around the red power wire so that it didn’t stand out like a sore thumb, but since the full sized battery sits there, it rubbed over the years and wore through the one layer of electrical tape. No electrical fires in this baby… yet!

I have to run the wire through my firewall for the arm switch, and then I can button it back up under the hood. I think that is the only wire that I need to run through, since the control box for the nitrous can stay under the hood, next to my fuse box and relays. Its a pretty simple setup really.

–mark

Looks great. Let me know how you like that bottler heater once you get it hooked up.

How strong are the axles on SRTs?

Stock hold up for the power I am making now with street tires, but break with slicks often. I got a set of DSS stage 3 axles on there now. The axle thickness is like 2.5x the size of stock, and are rated at 550 whp. They still break, but people are going 10’s with them and they are holding up.

nice! looks like this should be a solid setup. are you getting it dyno tuned?

Just to get the right jets for the nitrous. I am not changing any other parts of my setup.

thats some serious fucking power man.good luck

Not to down you but your positive that was 55shot on that car? i know turbo helps ALOT but an extra 143ft/lb? Sounds more like a 75-85hit to me… But either way your car will rock!

A lot of that is gained through the extra timing the computer will throw in with cooler charge temps. Plus the extra power you make from cooling the charge. Plus the power you make with the nitrous.

yea but 140+ ft/lb

Yup, I’m certain. At least on their setup. I don’t bench race, so my dyno chart will say what I gained from the shot. But yes, that was a 55 shot on his dyno, and others have had VERY similar from a 50 shot. I will spray whatever it will take though, no use shooting out arbitrary numbers. It will gain huge amounts of torque and a significant amount of whp.

:tup: what kind of clutch do you have?

ACT, it hasn’t slipped yet at this power, and I won’t be launching with any more power, so hopefully she holds strong. 4th gear on spray will tell :slight_smile:

word…are you going with a 55 shot like the example you provided? lol

how much power are stock SRT-4 internals good for? I would assume 470whp is pushing it.

470 is no sweat. 550 is about where you start needing a pretty good tune to hold stuff together. 600 is where you start worrying and need a damn near perfect tune.

^^^^ :tup: