Just built and installed my 426... now I have traction problems...... lets talk

[Blown-WK]

RDP = fail
Do some searches on this forum.....not pretty


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[MadTunes Racing]

Originally Posted by Blown-WK

RDP = fail
Do some searches on this forum.....not pretty


Sent from my iPhone using AutoGuide.com App

I appreciate the heads up.....I do have my own dynojet 248 with a wideband. I also have both hp tuners pro and the diablosport datalogging software. If I am not happy with the final a/f and spark advance, I'll make the necessary changes.

[First Jeep]

Originally Posted by MadTunes Racing

How harsh is the downshift when just easing along and coming to a stop with blue tops installed? Will it tick off a wife?

Here's my experience and take on them: I apologize now to friends and other guys who have purchased valvebody's and don't like Blue Tops... it's meant to be a honest review and not to offend anyone.

I had Blue Tops in my previous stock transmission and I don't get why everyone has such a negative report on them...The installation of these prolonged the life of my transmission till I went to high boost, and I've experienced none of the constant harshness everyone talks about. If you have a good working transmission before the install, and "proper" fluid levels, these work great.

Once you install these in your transmission, reset adaptives, and give it a chance to relearn your driving habits it behaves fine. You will get the occasional "harsh" shift from 2nd to 1st if you stab the gas and have to brake immediately in traffic, its almost like the transmission is catching up, if that makes sense, but any transmission will do this from time to time, but with the added shift pressure it will be more pronounced all the time.

BUT...you do notice they are there when you are driving aggressively!!! Upshifts are quick and firm and downshifts are just as quick and snappy, and the 2nd to 1st shift along with engine braking will push the seatbelt into you chest when braking hard...Its the same with my new SHR Viking now...aggressive when you want it to be, but I thought that the entire point of having an upgraded transmission

I never complained when I had them, nor did my girlfriend. I can't understand why guys don't trust or try a proven Mercedes performance part...but then get advised to pay double for a "modified" valve body that may or may not work at all when you install it...

"BLUE TOPS HAVE NEVER STRANDED SOMEONE OR CAUSED A GOOD WORKING TRANSMISSION TO GO INTO LIMP MODE OR FRY"...do your homework and read some of the horror stories on valve bodies on this forum and other forums where guys are out a lot of money on installation because its taken 2 or 3 VB swaps before they work or function right...This isn't the case all the time but it does happen a lot!

There is a reason why Blue Tops don't last when they go up for sale, why AMG's have them, and why vendors have a hard time keeping them in stock...My advice is do blue tops or save for a fully built transmission. A "credit back" on a VB from a transmission you might never need should not be a selling point, and why would you want a credit back on something that didn't prolong your transmission, and then lead your down a road to buy a certain built transmission later?

If you are planning on big power you can't avoid spending the money on a built transmission. But the Blue Top / VB direction you choose will cause a big difference in the money you spend limping the stocker along, and especially on your end game purchase.

I'm just being honest with nothing to gain from either direction you choose. GOOD LUCK WITH YOUR BUILD, its a great thread especially since you are building the Jeep yourself!

[MadTunes Racing]

Ok, Well I'm not sure why there are such differing opinions; however, some people drive different than others. As long as it does not throw you into the windshield when regular driving and slowing down then it seems like a reasonable shot at doing what I need it to. I am going to try the blue tops first.

I will say that before the tranny re-learned the new power it was sluggish shifting between 2 and 3 but it is much improved now. I think this build may allow the tranny to last a good long time in n/a form and if the blue tops firm up the shifts.


Guys, I only wish we had the control that HP Tuners has over GM Transmissions. They have been saying they are going to support dx for the last 5 years. Maybe we will one day have it.

I also was reading about a product called the "Tranzformer" that LX people were using. Is that under development for the Jeep and is it any good?

[Harrison@Stage6]

Here is a stock driveline with DR's making about 650rwhp.

Jeep SRT8 Turbo runs 10.68@125 - YouTube

Jeep SRT8 Turbo runs 10.68@125 - YouTube

And this was done on NT05 Street tires making about 800rwhp.

Jeep SRT8 Turbo 10.51@129 - YouTube

Jeep SRT8 Turbo 10.51@129 - YouTube

In all seriousness though, it's gonna come down to your stall and tires. If you've got a big stall in your Jeep with a 426, you're gonna spin like nuts on the street without a good tire and I think the NT05 is about the stickiest street tire you'll find for the street unless you want to be like us and run a DR on the street.

Like you said to Keoni, you can build it to hook...... but right now it's all about tires and stall. I ran a 3700 stall in those videos but it was flashing in the low 4000's with the turbo. My best 60' time with a stock rear end and DR's was a 1.46. Low times can be had at the track.

[1BAMFR]

Originally Posted by Harrison@Stage6

Here is a stock driveline with DR's making about 650rwhp.

Jeep SRT8 Turbo runs 10.68@125 - YouTube


And this was done on NT05 Street tires making about 800rwhp.

Jeep SRT8 Turbo 10.51@129 - YouTube


In all seriousness though, it's gonna come down to your stall and tires. If you've got a big stall in your Jeep with a 426, you're gonna spin like nuts on the street without a good tire and I think the NT05 is about the stickiest street tire you'll find for the street unless you want to be like us and run a DR on the street.

Like you said to Keoni, you can build it to hook...... but right now it's all about tires and stall. I ran a 3700 stall in those videos but it was flashing in the low 4000's with the turbo. My best 60' time with a stock rear end and DR's was a 1.46. Low times can be had at the track.

I remember i saw your Jeep in the staging lanes at VMP years ago and said. Yup, thats what i want. This is the set up I had been waiting for.

[MadTunes Racing]

http://www.facebook.com/#!/photo.php...type=1&theater



Here's a link to the dyno chart. I ended up getting a base file from Johan and I edited the wot a/f and spark on the dyno to dial it in. The other lines on the graph are from my LS6 CTS-V with maggie and long tubes. Check out how the hemi makes better mid-range numbers than the supercharged ls6. (fyi: the belt on the caddy slipped near the end of the pull or it probably would have hit 480+

I'm very pleased with how it drives and runs. I raced a friend's 12 model srt8 6.4 Challenger. He had drag radials, trinity tune, cai, and thermostat. He ran a 12.4 @ 111+ bone stock with only the radials. We ran after I installed his mods. From a 15 mph roll I pulled him to around 100 and then he held his ground but was not gaining. I was about 1.5 cars ahead at 115 when he gave up I also had some extra cargo in the back and a completely full tank of fuel so I am pretty optimistic that some 11.90s will be attainable with traction. I'm sure it would have been a worse kill if I would have ran from a dig. I'm rolling on the throttle with pretty good results off the line now.

[MadTunes Racing]

Attached pic

[af_maineiac]

Congrats on the dyno #'s! Very impressive if you're still on stock heads + the LittleBoy cam. How's your traction issue working out?
.

[MadTunes Racing]

Originally Posted by af_maineiac

Congrats on the dyno #'s! Very impressive if you're still on stock heads + the LittleBoy cam. How's your traction issue working out?
.

Hand ported stock heads and a custom 224/230 cam at about .575 lift.. pretty much a baby cam for this size engine. Stock exhaust manifolds but we did some mild porting on the intake manifold. I was shooting for 440 rwhp and super nice manners. I was also hoping for 11.90s on the track. I think I will get that too.

Johan's base tune and a little warmer weather has helped out alot on traction. I think it might hook ok on the track.